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| 1/25 www.rohm.com 2011.03 ? rev. a ? 2011 rohm co., ltd. all rights reserved. headphone amplifiers coupling capacitorless headphone amplifiers bd88400gul,bd88410gul,b d88415gul,bd88420gul description bd88xxxgul is output coupling capacitorless headphone amplifier. this ic has a negative voltage generator of regulated type built-in and generates the direct regulated negative volt age from the supply voltage. it is possible to drive headphones in a ground standard with both voltage of the positive voltage (+2. 4v) and the negative voltage (-2.4v). therefore a large-capacity output coupling capacitor becomes needless and can reduce a cost, a board area, and the height of the part. in addition, there is not the signal decre ment by the low range to happen by output coupling capacitor and output load impedance and can output a rich low tone. features 1) 2.4v to 5.5v single-supply operation 2) no bulky dc-blocking capacitors required 3) no degradation of low-frequency response due to output capacitors 4) ground-referenced outputs 5) gain setting bd88400gul: variable gain with external resistors bd88410gul: -1.0v/v bd88415gul: -1.5v/v bd88420gul: -2.0v/v 6) low thd+n 7) low supply current 8) integrated negative power supply 9) integrated short-circuit and thermal-overload protection 10) small package vcsp50l2 (2.1mm x 2.1mm) applications mobile phones, smart phones, pdas, portable audio players, pcs, tvs, digital cameras, digital video cameras, electronic dictionaries, voice reco rders, bluetooth head-sets, etc line up type supply voltage [v] supply current [ma] gain [v/v] maximum output power [mw] thd+n [%] noise voltage [vrms] psrr [db] package bd88400gul 2.4 5.5 2.0 (no signal) variable gain with external resister 80 (vdd=3.3v,rl=16 ? thd+n Q 1%,f=1khz) 0.006 (vdd=3.3v,rl=16 ? po=10mw,f=1khz) 10 -80 (f=217hz) vcsp50l2 (2.1mm x 2.1mm) bd88410gul -1.0 bd88415gul -1.5 bd88420gul -2.0 no.11102eat04
technical note 2/25 bd88400gul,bd88410gul,bd88415gul,bd88420gul www.rohm.com 2011.03 ? rev. a ? 2011 rohm co., ltd. all rights reserved. absolute maximum ratings parameter symbol ratings unit sgnd to pgnd voltage v gg 0.0 v svdd to pvdd voltage v dd -0.3 0.3 v svss to pvss voltage v ss 0.0 v sgnd or pgnd to svdd, pvdd voltage v dg -0.3 6.0 v svss, pvss to sgnd or pgnd voltage v sg -3.5 0.3 v sgnd to in_- voltage v in (svss-0.3) 2.8 v sgnd to out_- voltage v out (svss-0.3) 2.8 v pgnd to c1p- voltage v c1p (pgnd-0.3) (pvdd+0.3) v pgnd to c1n- voltage v c1n (pvss-0.3) (pgnd+0.3) v sgnd to shdn_b- voltage v sh (sgnd-0.3) (svdd+0.3) v input current i in -10 10 ma power dissipation p d 1350 * mw storage temperature range t stg -55 150 * in operating over 25 , de-rate the value to 10.8mw/ . this value is for mounted on the application board (grass-epoxy, size: 40mm x 60mm, h=1.6mm, top c opper area = 79.9%, bottom copper area = 80.2%). operating conditions parameter symbol ratings unit min. typ. max. supply voltage range v svdd ,v pvdd 2.4 - 5.5 v operating temperature range t opr -40 - +85 technical note 3/25 bd88400gul,bd88410gul,b d88415gul,bd88420gul www.rohm.com 2011.03 ? rev. a ? 2011 rohm co., ltd. all rights reserved. electrical characteristics unless otherwise specified, ta=25 , svdd=pvdd=3.3v, sgnd=pgnd=0v , shdnb=svdd, c1=c2=2.2f, rl=no load, ri=rf=10k parameter symbol limits unit conditions min. typ. max. supply current shutdown supply current i st - 0.1 2 a shdnlb=shdnrb=l quiescent supply current i dd1 - 1.3 - ma (shdnlb,shdnrb)=(h,l) or (l,h), no signal i dd2 - 2.0 7.4 ma shdnlb=shdnrb=h, no signal shdn_b terminal h level input voltage v ih 1.95 - - v l level input voltage v il - - 0.70 v input leak current i leak - - 1 a headphone amplifier shutdown to full operation t son - 80 - s shdnlb=shdnrb=l h offset voltage v is - 0.5 5.0 mv maximum output power p out 30 60 - mw rl=32 , thd+n Q -40db, f=1khz, 20khz lpf, for single channel 40 80 - mw rl=16 , thd+n Q -40db, f=1khz, 20khz lpf, for single channel total harmonic distortion + noise thd+n - 0.008 0.056 % rl=32 , pout=10mw, f=1khz, 20khz lpf - 0.006 0.100 % rl=16 , pout=10mw, f=1khz, 20khz lpf input impedance z in 10 14 19 k shdnlb=shdnrb=h in bd88400gul, zin = ri gain bd88400gul a v - -1.00 - v/v in bd88400gul, gain is variable by the external resister of ri and rf. bd88410gul -1.05 -1.00 -0.95 bd88415gul -1.55 -1.50 -1.45 bd88420gul -2.06 -2.00 -1.94 gain match a v - 1 - % noise v n - 10 - vrms 20khz lpf + jis-a slew rate sr - 0.15 - v/s maximum capacitive l oad cl - 200 - pf crosstalk ct - -90 - db rl=32 , f=1khz, vout=200mv p-p , 1khz bpf power supply rejection ratio psrr - -80 - db f=217hz, 100mv p-p \ ripple, 217hz bpf charge-pump oscillator frequency f osc 200 300 430 khz thermal-shutdown threshold tsd - 145 - thermal-shutdown hysteresis t hys - 5 - technical note 4/25 bd88400gul,bd88410gul,bd88415gul,bd88420gul www.rohm.com 2011.03 ? rev. a ? 2011 rohm co., ltd. all rights reserved. electrical characteristic curves ? general items (reference data) unless otherwise specified, ta=25 , sgnd=pgnd=0v, shdnlb=shdn rb=svdd, c1=c2=2.2f, input coupling capacitor=1f, rl=no load * in bd88400gul the input resister(ri)=10k , feedback resister(rf)=10k . fig.1 standby current vs. supply voltage 0.1n 1n 10n 100n 1u 0.0 1.0 2.0 3.0 4.0 5.0 6.0 supply voltage [v] standby current [a ] shdnlb=0v shdnrb=0v fig.3 stereo operating current vs. supply voltage 0.0 1.0 2.0 3.0 4.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 supply voltage [v] operating current [ma] shdnlb=vdd shdnrb=vdd * this caracteristics has hysteresis (40mv typ) by uv lo. fig.2 monaural operating current vs. supply voltage 0.0 1.0 2.0 3.0 4.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 supply voltage [v] operating current [ma] shdnlb=vdd shdnrb=0v * this caracteristics has hysteresis (40mv typ) by uv lo. fig.4 negative voltage vs. supply voltage -3 -2.5 -2 -1.5 -1 -0.5 0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 supply voltage [v] vss voltage [v] shdnlb=vdd shdnrb=vdd no load fig.8 psrr vs. frequency (vdd=3.3v) -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 100 1k 10k 100k frequency [hz] psrr [db] vdd=3.3v ripple = 100mvp-p bpf fig.7 psrr vs. frequency (vdd=2.4v) -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 100 1k 10k 100k frequency [hz] psrr [db] vdd=2.4v ripple = 100mvp-p bpf fig.9 psrr vs. frequency (vdd=5.5v) -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 100 1k 10k 100k frequency [hz] psrr [db] vdd=5.5v ripple = 100mvp-p bpf fig.10 crosstalk vs. frequency (vdd=2.4v) -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 100 1k 10k 100k frequency [hz] psrr [db] vdd=2.4v vout = 200mvp-p rl=32 bpf fig.11 crosstalk vs. frequency (vdd=3.3v) -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 100 1k 10k 100k frequency [hz] psrr [db] vdd=3.3v vout = 200mvp-p rl=32 bpf fig.12 crosstalk vs. frequency (vdd=5.5v) -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 100 1k 10k 100k frequency [hz] psrr [db] vdd=5.5v vout = 200mvp-p rl=32 bpf fig.5 setup time vs. supply voltage 0 20 40 60 80 100 120 140 160 180 200 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 supply voltage [v] setup time [us] shdnlb=shdnrb =l->h vss 90% setup time no load fig.6 maximum power vs. supply voltage 0 20 40 60 80 100 120 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 supply voltage [v] maximum output power [mw] thd+n Q -40db 20khz lpf stereo rl=16 , in phase rl=16 , out of phase rl=32 , out of phase rl=32 , in phase technical note 5/25 bd88400gul,bd88410gul,b d88415gul,bd88420gul www.rohm.com 2011.03 ? rev. a ? 2011 rohm co., ltd. all rights reserved. electrical characteristic curves ? bd88415gul (reference data) fig.13 output voltage vs. input voltage (vdd=2.4v) -120 -100 -80 -60 -40 -20 0 -120 -100 -80 -60 -40 -20 0 input voltage [dbv] output voltage [dbv] vdd=2.4v f=1khz bpf rl=32 rl=16 fig.14 output voltage vs. input voltage (vdd=3.3v) -120 -100 -80 -60 -40 -20 0 -120 -100 -80 -60 -40 -20 0 input voltage [dbv] output voltage [dbv] vdd=3.3v f=1khz bpf rl=32 rl=16 fig.15 output voltage vs. input voltage (vdd=5.5v) -120 -100 -80 -60 -40 -20 0 -120 -100 -80 -60 -40 -20 0 input voltage [dbv] output voltage [dbv] vdd=5.5v f=1khz bpf rl=32 rl=16 fig.16 gain vs. frequency (vdd=2.4v) -10 -8 -6 -4 -2 0 2 4 6 8 10 10 100 1k 10k 100k frequency [hz] gain [db] vdd=2.4v po=10mw rl=16 input coupling capacitor = 1.0uf rl=32 rl=16 fig.17 gain vs. frequency (vdd=3.3v) -10 -8 -6 -4 -2 0 2 4 6 8 10 10 100 1k 10k 100k frequency [hz] gain [db] vdd=3.3v po=10mw rl=16 input coupling capacitor = 1.0uf rl=32 rl=16 fig.18 gain vs. frequency (vdd=5.5v) -10 -8 -6 -4 -2 0 2 4 6 8 10 10 100 1k 10k 100k frequency [hz] gain [db] vdd=5.5v po=10mw rl=16 input coupling capacitor = 1.0uf rl=32 rl=16 fig.19 thd+n vs. output power (vdd=2.4v, rl=16 ) 0.001 0.01 0.1 1 10 100 1n 100n 10u 1m 100m output power [w] thd+n [%] vdd=2.4v 20khz-lpf f=1khz stereo rl=16 in phase out of phase fig.20 thd+n vs. output power (vdd=3.3v, rl=16 ) 0.001 0.01 0.1 1 10 100 1n 100n 10u 1m 100m output power [w] thd+n [%] vdd=3.3v 20khz-lpf f=1khz stereo rl=16 in phase out of phase fig.21 thd+n vs. output power (vdd=5.5v, rl=16 ) 0.001 0.01 0.1 1 10 100 1n 100n 10u 1m 100m output power [w] thd+n [%] vdd=5.5v 20khz-lpf f=1khz stereo rl=16 in phase out of phase fig.22 thd+n vs. output power (vdd=2.4v, rl=32 ) 0.001 0.01 0.1 1 10 100 1n 100n 10u 1m 100m output power [w] thd+n [%] vdd=2.4v 20khz-lpf f=1khz stereo rl=32 in phase out of phase fig.23 thd+n vs. output power (vdd=3.3v, rl=32 ) 0.001 0.01 0.1 1 10 100 1n 100n 10u 1m 100m output power [w] thd+n [%] vdd=3.3v 20khz-lpf f=1khz stereo rl=32 in phase out of phase fig.24 thd+n vs. output power (vdd=5.5v, rl=32 ) 0.001 0.01 0.1 1 10 100 1n 100n 10u 1m 100m output power [w] thd+n [%] vdd=5.5v 20khz-lpf f=1khz stereo rl=32 in phase out of phase technical note 6/25 bd88400gul,bd88410gul,b d88415gul,bd88420gul www.rohm.com 2011.03 ? rev. a ? 2011 rohm co., ltd. all rights reserved. electrical characteristic curves ? bd88415gul (reference data) ? continued fig.31 noise spectrum (vdd=2.4v) -140 -120 -100 -80 -60 -40 -20 0 10 100 1k 10k 100k frequency [hz] spectrum [dbv] vdd=2.4v input connect to the ground with 1uf fig.32 noise spectrum (vdd=3.3v) -140 -120 -100 -80 -60 -40 -20 0 10 100 1k 10k 100k frequency [hz] spectrum [dbv] vdd=3.3v input connect to the ground with 1uf fig.33 noise spectrum (vdd=5.5v) -140 -120 -100 -80 -60 -40 -20 0 10 100 1k 10k 100k frequency [hz] spectrum [dbv] vdd=5.5v input connect to the ground with 1uf fig.25 thd+n vs. frequency (vdd=2.4v, rl=16 ) 0.001 0.01 0.1 1 10 100 10 100 1k 10k 100k frequency [hz] thd+n [%] vdd=2.4v rl=16 20khz-lpf stereo (in phase) po=10mw po=1mw po=0.1mw fig. 26 thd+n vs. frequency (vdd=3.3v, rl=16 ) 0.001 0.01 0.1 1 10 100 10 100 1k 10k 100k frequency [hz] thd+n [%] vdd=3.3v rl=16 ? 20khz-lpf stereo (in phase) po=10mw po=1mw po=0.1mw fig. 27 thd+n vs. frequency (vdd=5.5v, rl=16 ) 0.001 0.01 0.1 1 10 100 10 100 1k 10k 100k frequency [hz] thd+n [%] vdd=5.5v rl=16 ? 20khz-lpf stereo (in phase) po=10mw po=1mw po=0.1mw fig. 28 thd+n vs. frequency (vdd=2.4v, rl=32 ) 0.001 0.01 0.1 1 10 100 10 100 1k 10k 100k frequency [hz] thd+n [%] vdd=2.4v rl=32 20khz-lpf stereo (in phase) po=1mw po=10mw po=0.1mw fig. 29 thd+n vs. frequency (vdd=3.3v, rl=32 ) 0.001 0.01 0.1 1 10 100 10 100 1k 10k 100k frequency [hz] thd+n [%] vdd=3.3v rl=32 ? 20khz-lpf stereo (in phase) po=1mw po=10mw po=0.1mw fig. 30 thd+n vs. frequency (vdd=5.5v, rl=32 ) 0.001 0.01 0.1 1 10 100 10 100 1k 10k 100k frequency [hz] thd+n [%] vdd=5.5v rl=32 ? 20khz-lpf stereo (in phase) po=1mw po=10mw po=0.1mw technical note 7/25 bd88400gul,bd88410gul,b d88415gul,bd88420gul www.rohm.com 2011.03 ? rev. a ? 2011 rohm co., ltd. all rights reserved. electrical characteristic curves ? bd88400gul (reference data) fig.34 output voltage vs. input voltage (vdd=3.3v) -120 -100 -80 -60 -40 -20 0 -120 -100 -80 -60 -40 -20 0 input voltage [dbv] output voltage [dbv] vdd=3.3v f=1khz bpf rl=32 rl=16 fig.40 noise spectrum (vdd=3.3v) -140 -120 -100 -80 -60 -40 -20 0 10 100 1k 10k 100k frequency [hz] spectrum [dbv] vdd=3.3v input connect to the ground with 1uf fig.35 gain vs. frequency (vdd=3.3v) -10 -8 -6 -4 -2 0 2 4 6 8 10 10 100 1k 10k 100k frequency [hz] gain [db] vdd=3.3v, po=10mw ri=10k , input coupling capacitor = 1.0uf rl=32 rl=16 fig.36 thd+n vs. output power (vdd=3.3v, rl=16 ) 0.001 0.01 0.1 1 10 100 1n 100n 10u 1m 100m output power [w] thd+n [%] vdd=3.3v 20khz-lpf f=1khz stereo rl=16 out of phase in phase fig. 37 thd+n vs. output power (vdd=3.3v, rl=32 ) 0.001 0.01 0.1 1 10 100 1n 100n 10u 1m 100m output power [w] thd+n [%] vdd=3.3v 20khz-lpf f=1khz stereo rl=32 out of phase in phase fig.38 thd+n vs. frequency (vdd=3.3v, rl=16 ) 0.001 0.01 0.1 1 10 100 10 100 1k 10k 100k frequency [hz] thd+n [%] vdd=3.3v rl=16 ? 20khz-lpf stereo (in phase) po=10mw po=1mw po=0.1mw fig. 39 thd+n vs. frequency (vdd=3.3v, rl=32 ) 0.001 0.01 0.1 1 10 100 10 100 1k 10k 100k frequency [hz] thd+n [%] vdd=3.3v rl=32 ? 20khz-lpf stereo (in phase) po=10mw po=1mw po=0.1mw technical note 8/25 bd88400gul,bd88410gul,b d88415gul,bd88420gul www.rohm.com 2011.03 ? rev. a ? 2011 rohm co., ltd. all rights reserved. electrical characteristic curves ? bd88410gul (reference data) fig.41 output voltage vs. input voltage (vdd=3.3v) -120 -100 -80 -60 -40 -20 0 -120 -100 -80 -60 -40 -20 0 input voltage [dbv] output voltage [dbv] vdd=3.3v f=1khz bpf rl=32 rl=16 fig.42 gain vs. frequency (vdd=3.3v) -10 -8 -6 -4 -2 0 2 4 6 8 10 10 100 1k 10k 100k frequency [hz] gain [db] vdd=3.3v po=10mw input coupling capacitor = 1.0uf rl=32 rl=16 fig.47 noise spectrum (vdd=3.3v) -140 -120 -100 -80 -60 -40 -20 0 10 100 1k 10k 100k frequency [hz] spectrum [dbv] vdd=3.3v input connect to the ground with 1uf fig.43 thd+n vs. output power (vdd=3.3v, rl=16 ) 0.001 0.01 0.1 1 10 100 1n 100n 10u 1m 100m output power [w] thd+n [%] vdd=3.3v 20khz-lpf f=1khz stereo rl=16 out of phase in phase fig. 44 thd+n vs. output power (vdd=3.3v, rl=32 ) 0.001 0.01 0.1 1 10 100 1n 100n 10u 1m 100m output power [w] thd+n [%] vdd=3.3v 20khz-lpf f=1khz stereo rl=32 out of phase in phase fig.45 thd+n vs. frequency (vdd=3.3v, rl=16 ) 0.001 0.01 0.1 1 10 100 10 100 1k 10k 100k frequency [hz] thd+n [%] vdd=3.3v rl=16 ? 20khz-lpf stereo (in phase) po=10mw po=1mw po=0.1mw fig. 46 thd+n vs. frequency (vdd=3.3v, rl=32 ) 0.001 0.01 0.1 1 10 100 10 100 1k 10k 100k frequency [hz] thd+n [%] vdd=3.3v rl=32 ? 20khz-lpf stereo (in phase) po=10mw po=1mw po=0.1mw technical note 9/25 bd88400gul,bd88410gul,b d88415gul,bd88420gul www.rohm.com 2011.03 ? rev. a ? 2011 rohm co., ltd. all rights reserved. electrical characteristic curves ? bd88420gul (reference data) fig.48 output voltage vs. input voltage (vdd=3.3v) -120 -100 -80 -60 -40 -20 0 -120 -100 -80 -60 -40 -20 0 input voltage [dbv] output voltage [dbv] vdd=3.3v f=1khz bpf rl=32 rl=16 fig.49 gain vs. frequency (vdd=3.3v) -10 -8 -6 -4 -2 0 2 4 6 8 10 10 100 1k 10k 100k frequency [hz] gain [db] vdd=3.3v po=10mw input coupling capacitor = 1.0uf rl=32 rl=16 fig.54 noise spectrum (vdd=3.3v) -140 -120 -100 -80 -60 -40 -20 0 10 100 1k 10k 100k frequency [hz] spectrum [dbv] vdd=3.3v input connect to the ground with 1uf fig.50 thd+n vs. output power (vdd=3.3v, rl=16 ) 0.001 0.01 0.1 1 10 100 1n 100n 10u 1m 100m output power [w] thd+n [%] vdd=3.3v 20khz-lpf f=1khz stereo rl=16 out of phase in phase fig. 51 thd+n vs. output power (vdd=3.3v, rl=32 ) 0.001 0.01 0.1 1 10 100 1n 100n 10u 1m 100m output power [w] thd+n [%] vdd=3.3v 20khz-lpf f=1khz stereo rl=32 out of phase in phase fig.52 thd+n vs. frequency (vdd=3.3v, rl=16 ) 0.001 0.01 0.1 1 10 100 10 100 1k 10k 100k frequency [hz] thd+n [%] vdd=3.3v rl=16 ? 20khz-lpf stereo (in phase) po=10mw po=1mw po=0.1mw fig. 53 thd+n vs. frequency (vdd=3.3v, rl=32 ) 0.001 0.01 0.1 1 10 100 10 100 1k 10k 100k frequency [hz] thd+n [%] vdd=3.3v rl=32 ? 20khz-lpf stereo (in phase) po=10mw po=1mw po=0.1mw technical note 10/25 bd88400gul,bd88410gul,b d88415gul,bd88420gul www.rohm.com 2011.03 ? rev. a ? 2011 rohm co., ltd. all rights reserved. pin arrangement 1 2 3 4 d svdd outl svss pvss c inl outr c1n b shdnrb shdnlb pgnd a inr sgnd pvdd c1p (bottom view) pin function ball matrix pin name function symbol a1 inr headphone amplifier (rch) input c a2 sgnd ground for headphone amplifier - a3 pvdd positive power supply for charge pump - a4 c1p flying capacitor (cf) positive a b1 shdnrb headphone amplifier (rch) shutdo wn control (h:active, l:shutdown) e b2 shdnlb headphone amplifier (lch) shutdo wn control (h:active, l:shutdown) e b4 pgnd ground for charge pump - c1 inl headphone amplifier (lch) input c c2 outr headphone amplifier (rch) output d c4 c1n flying capacitor (cf) negative b d1 svdd ground for headphone amplifier - d2 outl headphone amplifier (lch) output d d3 svss negative supply voltage for signal - d4 pvss negative supply voltage output f pin equivalent circuit a pad pvdd pvdd pgnd pgnd c pad - + svdd svss d pad - + svss svdd e pad svdd sgnd b pad pvss pvss pgnd pgnd fig.55 pin equivalent circuit f pad pgnd pgnd technical note 11/25 bd88400gul,bd88410gul,b d88415gul,bd88420gul www.rohm.com 2011.03 ? rev. a ? 2011 rohm co., ltd. all rights reserved. block diagram type rin rfb bd88400gul 14k @typ. open bd88410gul 14k @typ. 14k @typ. bd88415gul 14k @typ. 21k @typ. bd88420gul 14k @typ. 28k @typ. fig.56 block diagram d2 + - svdd svss + - svdd svss short protection tsd sgnd sgnd uvlo/ shutdown control c2 rin rfb rfb rin c1 a1 b2 b1 d1 charge pump clock generator svdd svdd svdd d3 svdd svss a3 a4 b4 c4 d4 sgnd a2 pvdd c1p pgnd c1n pvss inr inl shdnlb shdnrb sgnd svdd outl outr svss charge pump control pvdd technical note 12/25 bd88400gul,bd88410gul,b d88415gul,bd88420gul www.rohm.com 2011.03 ? rev. a ? 2011 rohm co., ltd. all rights reserved. functional descriptions the conventional headphone amplifier composit ion is occupied to fig.57. in this co mposition, the signal is output by using the middle point bias circuit based on the middle point bias. therefore, the output coupling capaci tor that removes the dc voltage difference and does the ac coupling is necessary. this coupling capacitor and the impedance of the headphone composes the high-pass filter. t herefore, the signal de gradation in the low frequency r egion learns by experience. the output coupling capacitor should be a large capacity, because the cutoff frequency of this high-pass filter becomes the following formula (1). c l c c r 2 1 f ? (1) * cc is the coupling capacitor, and rl is the impedance of the headphone. moreover, pop noise by the middle point bias start-up is generated and the degradation of psrr learns by experience. + - vdd gnd + vout input time [s] vout [v] vdd/2 middle point bias circuit vdd 0 vhp 0 vhp [v] time [s] cc fig.57 conventional headphone amplifier composition the composition of the series of bd884xxgul is occupied to fig.58. in this composition, the signal is output by using a negative voltage based on the ground level. therefore, the amplifier output can be connected dire ctly with the headphone. and, the output coupling capacitor becomes unnecessary. additi onally, the signal degradation in the low frequency region with the coupling capacitor is not generated, and the deep bass is achieved. moreover, pop noise is controlled because of no middle point bias start-up. and, the degradat ion of psrr doesn't occur by being based on the ground. + - hpvdd vout input time [s] vout [v] vdd charge pump vss 0 cf : flying capacitor ch : hold capacitor vhp 0 vhp [v] time [s] hpvdd fig.58 composition of t he series of bd884xxgul technical note 13/25 bd88400gul,bd88410gul,bd88415gul,bd88420gul www.rohm.com 2011.03 ? rev. a ? 2011 rohm co., ltd. all rights reserved. [charge pump / charge pump control] the negative power supply circuit is composed of the regulated charge-pump. this circuit outputs the regulated negative voltage (pvss) directly from power-supply voltage (pvdd). therefore, it doesn't depend on the power-supply voltage, and a constant voltage is output (pvss=-2.4v @typ. , refer to fig.4). moreover, there is not swinging of the power supply by the output current of the headphone amp lifier, and it doesn't influence the headphone amplifier characteristic. fig.59 characteristics of load curr ent regulation of pvss (reference data) ? power control the power control is a logical sum of shdnlb and shdnrb. the negative power supply circuit starts when h level is input to either of shdnlb or shdnrb, and po wer is downed at the shdnlb=shdnrb=l level. table.1 control of the charge pump shdnlb shdnrb control l l power down l h power on h l power on h h power on ? operating frequency the operating frequency of the negative power supply charge pump is desig ned for the temperature and the voltage dependence may decrease. the reference data (measurements) is occupied to fig.60. please note the interference with the frequency in the application board. fig.60 temperature characteristic and voltage characteristic of operating frequency (reference data) ? the flying capacitor and the hold capacitor the flying capacitor (cf) and the hold capacitor (ch) greatly in fluence the characteristic of the charge pump. therefore, please connect the capacitor with an excellent temperature char acteristic and voltage characteri stic of 2.2f as much as possible near ic. -3 -2.5 -2 -1.5 -1 -0.5 0 0 20406080 load current [ma] vss voltage [v] ta=25 vdd=3.3v shdn_b=svdd cf=ch=2.2uf 200 220 240 260 280 300 320 340 360 380 400 2.0 3.0 4.0 5.0 6.0 supply voltage[v] charge pump ocsillator frequency [khz ] ta=25 measure : c1p cf=ch=2.2uf 200 220 240 260 280 300 320 340 360 380 400 -50.0 0.0 50.0 100.0 ta [ ] charge pump ocsillator frequency [khz ] vdd=3.3v measure : c1p cf=ch=2.2uf technical note 14/25 bd88400gul,bd88410gul,b d88415gul,bd88420gul www.rohm.com 2011.03 ? rev. a ? 2011 rohm co., ltd. all rights reserved. [headphone amp] the headphone amplifier is driven by the internal positiv e voltage (+2.4v) and negative vo ltage (svss, -2.4v) based on ground (sgnd). therefore, the headphone can be connected without the output coupling capacitor. as a result, it brings the improved low-frequency characteristic compared with the headphone of the conventional coupling capacitor type. ? power control l channel and r channel of the headpho ne amplifier can be independently contro lled by shdnlb and shdnrb logic. when the svss voltage is -1.1v @typ. or more, the headphone amplifier does not operate to protect from illegal operation. and in addition, the overcurrent protecti on circuit is built in. the amplifier is shutdown when the overcurrent occurs because of the output short-circuit etc., and ic is protected from being destroyed. table.2 control of the headphone amplifier shdnlb shdnrb l channel r channel l l power down power down l h power down power on h l power on power down h h power on power on vdd 0 [v] [time] shdnx b 0 [v] [time] svss -1.1v amplif ier en a b le amprilier disable fig.61 area of headphone am plifier can operate svss does not have internal connection with pvss. pl ease connect svss with pvss on the application board. ? input coupling capacitor input dc level of bd884xxgul is 0v (s gnd). the input coupling capacitor is necessary for the connection with the signal source device. the signal decrease happens in the low frequency because of composing the high-pass filter by this input coupling capacitor and the input impedance of bd884xxgul. the input impedance of bd884xxgul is rin (14k @typ. ). the cutoff frequency of this high-pass filter becomes the following formula. (in bd88400gul, rin becomes external resistance ri. ) in in c c r 2 1 f ? (2) * cin is the input coupling capacitor. fig.62 frequency response by the input coupling capacitor (reference data) -21.0 -18.0 -15.0 -12.0 -9.0 -6.0 -3.0 0.0 3.0 6.0 9.0 1 10 100 frequency [hz] gain [db] rin=14k cin=1uf cin=2.2uf cin=4.7uf cin=10uf technical note 15/25 bd88400gul,bd88410gul,bd88415gul,bd88420gul www.rohm.com 2011.03 ? rev. a ? 2011 rohm co., ltd. all rights reserved. and, the degradation of thd+n happens be cause of the input coupling capacitor. t herefore, please consider these about the selection of parts. * capacitor size: 1608 fig.63 thd+n by the input coupling capacitor (reference data) ? state of terminal when power down the state of the terminal changes by the power control of the headphone amplifier. when it is shutdown, the input impedance of the input terminal becomes 7.1k @typ. (in bd88400gul, become ri + 7.1k ). the time constant can be reduced when the input coupling capacitor is charged. the input voltage changes while charging up the input coupl ing capacitor. therefore, do not operate the headphone amplifier while charging. audio source + - vdd vout time [s] vs [v] output bias 0 vss vs vin time [s] vin [v] output bias 0 cin rin =7.1k fig.64 input voltage transition with input coupling capacitor this charge time constant becomes the following formula (3) by using the input coupling capacitor and the input impedance. and the calculation valu e of the convergence to the wait time is indicated in fig.65. inin cr ? (3) * rin=7.1k @typ. . in bd88400gul, rin=ri+7.1k fig.65 wait time and convergence (reference) 0 10 20 30 40 50 60 70 80 90 100 0 1 2 3 4 5 6 7 8 wait time [s] convergence [%] -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 100 1k 10k 100k frequency [hz] thd+n [db] bd88415gul vdd=3.3v po=10mw rl=16 20khz lpf cin=0.22uf cin=0.47uf cin=1.0uf cin=2.2uf technical note 16/25 bd88400gul,bd88410gul,b d88415gul,bd88420gul www.rohm.com 2011.03 ? rev. a ? 2011 rohm co., ltd. all rights reserved. [uvlo / shutdown control] bd884xxgul has low voltage protection function (uvlo: under voltage lock out). and protect from the illegal operation of ic by a low power supply voltage. the detection voltage is 2.13v @typ. , so it does not influence 2.4v of recomm ended operation voltage. uvlo controls the whole of ic, and does both the negative power supply charge pump and the headphone amplifier in power down. [tsd] bd884xxgul has overheating protection function (tsd: thermal shutdown). and the headphone amplifier becomes shutdown when illegally overheating by t he headphone amplifier illegally operation. timming chart (usually operation) pv dd,sv dd shdnlb shdnrb pvss,svss inl,inr outl outr shutdow n setup signal output shutdow n amp enable fig.66 usually operation (uvlo operation) pvdd,svdd shdnlb, shdnrb pvss,svss outl outr setup signal output signal output uvlo fig.67 uvlo operation (tsd operation) pv dd, sv dd shdnlb, shdnrb pvss,svss outl outr signal output signal output tsd ta hy steresis = 5 fig.68 tsd operation technical note 17/25 bd88400gul,bd88410gul,b d88415gul,bd88420gul www.rohm.com 2011.03 ? rev. a ? 2011 rohm co., ltd. all rights reserved. application circuit fig.69 bd88410gu/bd88415gul/bd 88420gul application circuit fig.70 bd88400gul application circuit in bd88400gul, the pass gain becomes the following formula (4). the pass gain and the resister rf is limited by table.3. i f r r gain ? (4) table.3 pass gain and resister limit item min. typ. max. unit pass gain 0.5 1.0 2.0 v/v rf 1.0 10 - k ri - 10 - k ri is not limited. but, if this resister ri is very small, the signal decrease happens in the low frequency (refer to formula 2 ). part function value remarks cf flying capacitor 2.2f temp. characteristic class-b ch hold capacitor 2.2f temp. characteristic class-b cpvdd bypass capacitor 1.0f temp. characteristic class-b csvdd bypass capacitor 1.0f temp. characteristic class-b cil coupling capacitor 1.0f temp. characteristic class-b cir coupling capacitor 1.0f temp. characteristic class-b part function value remarks cf flying capacitor 2.2f temp. characteristic class-b ch hold capacitor 2.2f temp. characteristic class-b cpvdd bypass capacitor 1.0f temp. characteristic class-b csvdd bypass capacitor 1.0f temp. characteristic class-b cil coupling capacitor 1.0f temp. characteristic class-b cir coupling capacitor 1.0f temp. characteristic class-b ri input resistor 10k mcr006yzpj103 (rohm) rf feedback resistor 10k mcr006yzpj103 (rohm) d2 + - svdd svss + - svdd svss short protection tsd sgnd sgnd uvlo/ shutdown control c2 rin rfb rfb rin c1 a1 b2 b1 d1 charge pump clock generator svdd svdd svdd d3 svdd svss a3 a4 b4 c4 d4 sgnd a2 pvdd c1p pgnd c1n pvss svdd outl outr svss charge pump control pvdd 3.3v 1.0f 2.2f 2.2f 1.0f rch input 3.3v 1.0f shutdown control 1.0f lch input cf ch cpvdd csvdd cil cir inr inl shdnlb shdnrb sgnd technical note 18/25 bd88400gul,bd88410gul,bd88415gul,bd88420gul www.rohm.com 2011.03 ? rev. a ? 2011 rohm co., ltd. all rights reserved. thermal derating curve the reference value of the thermal der ating curve is indicated in fig.71. (conditions) this value is for mounted on the rohm application board board size 40mm x 60mm x 1.6mm top copper area 79.9% bottom copper area 80.2% board layout fig.74 fig.71 thermal derating curve 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 0 25 50 75 100 125 150 ta [ ] pd [w] technical note 19/25 bd88400gul,bd88410gul,b d88415gul,bd88420gul www.rohm.com 2011.03 ? rev. a ? 2011 rohm co., ltd. all rights reserved. evaluation board d8876fv evaluation board loads with the necessary parts. it can operate only by it. it is using rca connector for input terminal and headphone jack ( =3.5mm) for output terminal. therefore it c an easily connect between audio equipments. and it can operate by single supply (2.4 to 5.5v). the switch on the board (sdb) can control shutdown. (spec.) item limit unit supply voltage range (vdd) 3.0 to 5.5 v maximum supply current 1.0 a operating temperature range -40 to 85 input voltage range -2.5 to 2.5 v output voltage range -2.5 to 2.5 v minimum load impedance 15 (schematic) outl inl pvdd svdd pgnd sgnd shdnlb outr inr c1p c1n pvss svss shdnrb d1 b2 a3 c1 d2 c2 a1 d4 d3 a4 c4 b4 a2 b1 c6 1 f in technical note 20/25 bd88400gul,bd88410gul,b d88415gul,bd88420gul www.rohm.com 2011.03 ? rev. a ? 2011 rohm co., ltd. all rights reserved. outl inl pvdd svdd pgnd sgnd shdnlb outr inr c1p c1n pvss svss shdnrb d1 b2 a3 c1 d2 c2 a1 d4 d3 a4 c4 b4 a2 b1 c6 1 f in technical note 21/25 bd88400gul,bd88410gul,b d88415gul,bd88420gul www.rohm.com 2011.03 ? rev. a ? 2011 rohm co., ltd. all rights reserved. (board layout) (top silkscreen ? top view) (top layer - top view) (bottom layer ? top view) (bottom silkscreen ? top view) fig.74 rohm application board layout (bd88410gul/bd88415gul/bd88420gul) technical note 22/25 bd88400gul,bd88410gul,b d88415gul,bd88420gul www.rohm.com 2011.03 ? rev. a ? 2011 rohm co., ltd. all rights reserved. (top silkscreen ? top view) (top layer - top view) (bottom layer ? top view) (bottom silkscreen ? top view) fig.75 rohm application bo ard layout (bd88400gul) technical note 23/25 bd88400gul,bd88410gul,b d88415gul,bd88420gul www.rohm.com 2011.03 ? rev. a ? 2011 rohm co., ltd. all rights reserved. notes for use (1) absolute maximum ratings an excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions, etc., can break down devices, thus making impossible to identify breaking mode such as a short circuit or an open circuit. if any special mode exceeding the absolute maximum ratings is a ssumed, consideration should be given to take physical safety measures including the use of fuses, etc. (2) operating conditions these conditions represent a range within which characteri stics can be provided approx imately as expected. the electrical characteristics are guaranteed under the conditions of each parameter. (3) reverse connection of power supply connector the reverse connection of power supply connector can br eak down ics. take protec tive measures against the breakdown due to the reverse connection, such as mounting an external diode between the power supply and the ic?s power supply terminal. (4) power supply line design pcb pattern to provide low impedance for the wiring between the power supply and the gnd lines. in this regard, for the digital block power supply and the analog block power supply, even though these power supplies has the same level of potential, separate t he power supply pattern for the digital blo ck from that for the analog block, thus suppressing the diffraction of digital noises to the analog block power supply resulting from impedance common to the wiring patterns. for the gnd line, give consider ation to design the patterns in a similar manner. furthermore, for all power supply terminals to ics, mount a capacitor between the power supply and the gnd terminal. at the same time, in order to use an electrolytic capacito r, thoroughly check to be sure the characteristics of the capacitor to be used present no problem including the occu rrence of capacity dropout at a low temperature, thus determining the constant. (5) gnd voltage make setting of the potential of the gnd terminal so that it will be maintained at the minimum in any operating state. furthermore, check to be sure no terminals are at a potentia l lower than the gnd voltage including an actual electric transient. (6) short circuit between terminals and erroneous mounting in order to mount ics on a set pcb, pay thorough attention to the direction and offset of the ics. erroneous mounting can break down the ics. furthermore, if a short circuit occurs due to foreign matters entering between terminals or between the terminal and the power supply or the gnd terminal, the ics can break down. (7) operation in strong electromagnetic field be noted that using ics in the strong elec tromagnetic field can malfunction them. (8) inspection with set pcb on the inspection with the set pcb, if a capacitor is connect ed to a low-impedance ic terminal, the ic can suffer stress. therefore, be sure to discharge from t he set pcb by each process. furthermore, in order to mount or dismount the set pcb to/from the jig for the inspection process, be sure to turn off the power supply and then mount the set pcb to the jig. after the completion of the inspection, be sure to tu rn off the power supply and then dismount it from the jig. in addition, for protection against static electricity, establis h a ground for the assembly process and pay thorough attention to the transportation and t he storage of the set pcb. (9) input terminals in terms of the construction of ic, parasitic elements are in evitably formed in relation to potential. the operation of the parasitic element can cause interference with circuit operati on, thus resulting in a malf unction and then breakdown of the input terminal. therefore, pay thorou gh attention not to handle the input te rminals, such as to apply to the input terminals a voltage lower than the gnd respectively, so t hat any parasitic element wi ll operate. furthermore, do not apply a voltage to the input terminals when no power supply voltage is applied to the ic. in addition, even if the power supply voltage is applied, apply to the input terminals a voltage lower than the power supply voltage or within the guaranteed value of electrical characteristics. (10) ground wiring pattern if small-signal gnd and large-current gnd are provided, it will be recommended to separate the large-current gnd pattern from the small-signal gnd pattern and establish a si ngle ground at the reference poi nt of the set pcb so that resistance to the wiring pattern and voltage fluctuations due to a large current will cause no fluctuations in voltages of the small-signal gnd. pay att ention not to cause fluctuations in the gnd wiring pattern of external parts as well. (11) external capacitor in order to use a ceramic capacitor as the external capacitor, determine the c onstant with consideration given to a degradation in the nominal capacitance due to dc bias and c hanges in the capacitance due to temperature, etc. (12) about the rush current for ics with more than one power supply, it is possible that rush current may flow instantaneously due to the internal powering sequence and delays. therefore, give special c onsideration to power coupling capacitance, power wiring, width of gnd wiring, and routing of wiring. technical note 24/25 bd88400gul,bd88410gul,bd88415gul,bd88420gul www.rohm.com 2011.03 ? rev. a ? 2011 rohm co., ltd. all rights reserved. ordering part number b d 8 8 4 1 5 g u l - e 2 part no. part no. bd88400 bd88410 bd88415 bd88420 package gul: vcsp50l2 packaging and formingspecification e2: embossed tape and reel ? order quantity needs to be multiple of the minimum quantity. technical note 25/25 bd88400gul,bd88410gul,bd88415gul,bd88420gul www.rohm.com 2011.03 ? rev. a ? 2011 rohm co., ltd. all rights reserved. ? order quantity needs to be multiple of the minimum quantity. r1120 a www.rohm.com ? 2011 rohm co., ltd. all rights reserved. notice rohm customer support system http://www.rohm.com/contact/ thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact us. notes no copying or reproduction of this document, in part or in whole, is permitted without the consent of rohm co.,ltd. the content specied herein is subject to change for improvement without notice. the content specied herein is for the purpose of introducing rohm's products (hereinafter "products"). if you wish to use any such product, please be sure to refer to the specications, which can be obtained from rohm upon request. examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the products. the peripheral conditions must be taken into account when designing circuits for mass production. great care was taken in ensuring the accuracy of the information specied in this document. however, should you incur any damage arising from any inaccuracy or misprint of such information, rohm shall bear no responsibility for such damage. the technical information specied herein is intended only to show the typical functions of and examples of application circuits for the produc ts. rohm does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by rohm and other parties. rohm shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. the products specied in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, ofce-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specied in this document are not designed to be radiation tolerant. while rohm always makes efforts to enhance the quality and reliability of its products, a product may fail or malfunction for a variety of reasons. please be sure to implement in your equipment using the products safety measures to guard against the possibility of physical injury, re or any other damage caused in the event of the failure of any product, such as derating, redundancy, re control and fail-safe designs. rohm shall bear no responsibility whatsoever for your use of any product outside of the prescribed scope or not in accordance with the instruction manual. the products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel- controller or other safety device). rohm shall bear no responsibility in any way for use of any of the products for the above special purposes. if a product is intended to be used for any such special purpose, please contact a rohm sales representative before purchasing. if you intend to export or ship overseas any product or technology specied herein that may be controlled under the foreign exchange and the foreign trade law, you will be required to obtain a license or permit under the law. |
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