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block diagram and pin configuration ? e93717-te read/write amplifier (with built-in filters) for fdds 32 pin qfp (plastic) CXA1720Q supply voltage detection circuit prohibits error writing during power on/off or abnormal voltage. power consumption is kept down to 115 mw (typ.) and this ic is suitable for use with battery-driven fdds. built in time constant capacitors for monostable multivibrator nos. 1 and 2. (the pulse width for monostable multivibrator no. 2 is fixed.) power saving function reduces power consumption when the ic is not in use. when in power saving mode (5 mw typ.), only the power supply on/off detector functions. the write driver has a built-in reset circuit. when the mode is switched from read mode to write mode, the write current flows from head 0a if head side 0 is selected and from head 1a if head side 1 is selected. description the CXA1720Q is an ic for use with floppy disk drives, and contains a read circuit (with built-in filters), write circuit, erase circuit, and supply voltage detection circuit, all into a single chip. features single 5 v power supply. filter system can be switched among four modes: 1m/2m, and inner track/outer track. this allows for a significant reduction in the number of external parts such as differentiator constants, low-pass filters, and switches. (compared with conventional sony products, the number of parts has been reduced by one-half.) filter characteristics can be customized. low pre-amplifier input conversion noise voltage of 2.0 nv/ hz (typ.) keeps read data output jitter to a minimum. the pre-amplifier voltage gain can be selected as either 100 or 200 . the monostable multivibrator no. 1 pulse width switching function for the time domain filter permits switching between 1m and 2m mode. write current switching function permits switching of the write current among four modes: 1m/2m and inner track/outer track. (filter inner track/outer track switching is separate.) filter out b comp in b comp in a a.gnd mmva filter set vcc high density power on write data read data write current write gate erase gate side 1 filter control w/c 1 set w/c 1 comp w/c 2 set w/c 2 comp erase out 0 erase out 1 head 0a head 0b head 1a head 1b preamp out vref filter out a write driver erase driver power monitor control logic time domain filter comp filter diff+lpf (bpf) 1 2 3 4 5 6 7 8 16 15 14 13 12 9 10 11 22 21 20 19 18 17 23 24 high gain 25 26 27 28 29 30 31 32 d.gnd power save preamp sony reserves the right to change products and specifications without prior notice. this information does not convey any licens e by any implication or otherwise under any patents or other right. application circuits shown, if any, are typical examples illustr ating the operation of the devices. sony cannot assume responsibility for any problems arising out of the use of these circuits.
2 CXA1720Q structure bipolar silicon monolithic ic absolute maximum ratings (ta=25 c) supply voltage v cc 7 v digital signal input pin (note) input voltage ?.5 to v cc +0.3 v power on output applied voltage v cc +0.3 v erase output applied voltage v cc +0.3 v head 0a, 0b, 1a, 1b applied voltage 15 v power on output sink current 7 ma erase output sink current 30 ma operating temperature topr ?0 to +75 c storage temperature tstg ?5 to +150 c allowable power dissipation p d 500 mw supply voltage range v cc 4.4 to 6.0 v note) write data, write current, write gate, erase gate side1, filter control, high density, high gain, power save
3 CXA1720Q pin description (ta=25 c, v cc =5 v) v c c a . g n d 1 k 2 2 . 3 v v c c d . g n d 1 4 0 3 v c c a . g n d 1 k 1 0 0 k 2 . 1 v 4 5 6 8 9 2 0 7 pin symbol pin voltage equivalent circuit description no. 1 2 3 4 5 6 7 8 9 20 power on write data read data write current write gate erase gate side1 filter control high density high gain v c c a . g n d 1 0 0 k 1 reduced voltage detection output. this is an open collector that outputs a low signal when v cc is below the specified value. write data input. this pin is a schmitt-type input and is triggered when the logical voltage goes from high to low. read data output. this pin is active when the logical voltage of the write gate signal and the erase gate signal is high. write current control. the write current is increased when the logical voltage is low. write gate signal input. the write system is active when the logical voltage is low. erase gate signal input. the erase system is active when the logical voltage is low. head side switching signal input. the head1 system is active when the logical voltage is low, and the head0 system is active when the logical voltage is high, but only when the logical voltage for the write gate and the erase gate is high. filter inner track/outer track mode control. inner track mode is selected when the logical voltage is low. filter, time domain filter and write current 1m/2m mode control. 2m mode is selected when the logical voltage is low. pre-amplifier voltage gain selection. gain of 100x is selected when the logical voltage is high; gain of 200x is selected when the logical voltage is low.
4 CXA1720Q v c c a . g n d 1 4 7 1 . 2 v 1 2 v c c a . g n d 1 4 1 5 1 4 7 1 4 7 1 0 k 1 0 k 1 6 k 6 0 v c c a . g n d 1 4 0 1 6 1 7 5 0 0 1 4 0 5 0 0 pin symbol pin voltage equivalent circuit description no. 10 11 12 13 14 15 16 17 v cc filter set mmva a. gnd comp in a comp in b filter out b filter out a 3.8 v 0.5 v 3.3 v 3.3 v 3.3 v 3.3 v v c c a . g n d 1 4 7 1 1 1 . 2 v 1 k power supply (5 v) connection. connection for filter cut-off frequency setting resistor. connect the filter cut-off frequency setting resistor r f between this pin and v cc to set the cut- off frequency. time domain filter monostable multivibrator no. 1 pulse width setting pin. connect the monostable multivibrator no. 1 pulse width setting resistor r a between this pin and a.gnd. analog system gnd connection. comparator differential inputs. filter differential outputs.
5 CXA1720Q v c c a . g n d 1 4 0 3 2 0 1 9 a . g n d 2 4 2 3 2 2 2 1 v c c a . g n d 1 . 2 v 2 5 2 7 1 4 7 1 4 7 v c c a . g n d 2 8 2 6 pin symbol pin voltage equivalent circuit description no. 18 19 21 22 23 24 25 27 26 28 vref preamp out head 1b head 1a head 0b head 0a w/c1set w/c2set w/c1 comp w/c2 comp 2.8 v 2.8 v v c c a . g n d 5 0 0 1 2 0 1 8 connection for internal reference voltage decoupling capacitor. connect the decoupling capacitor cref between this pin and a.gnd. pre-amplifier output. connection for magnetic head input/output. connect the recording/playback magnetic head to these pins, and connect the center tap to v cc . when the logical voltage for pin 7 (side1) is low, the head1 system is active; when the logical voltage is high, the head0 system is active. connection for 1m write current setting resistor. connect the write current setting resistor r w1 between this pin and v cc to set the write current. connection for 2m write current setting resistor. connect the write current setting resistor r w2 between this pin and v cc to set the write current. connection for 1m write current compensation resistor. connect the write current compensation resistor r wc1 between this pin and pin 25 (w/c1set) to set the amount of increase in the write current. connection for 2m write current compensation resistor. connect the write current compensation resistor r wc2 between this pin and pin 27 (w/c2set) to set the amount of increase in the write current.
6 CXA1720Q v c c a . g n d 1 k 1 6 2 k 2 . 1 v 3 2 pin symbol pin voltage equivalent circuit description no. 29 30 31 32 d. gnd erase out0 erase out1 power save v c c d . g n d 3 0 3 1 digital system gnd connection. erase current output for the head0 system. erase current output for the head1 system. power saving signal input. when the logical voltage is low, the ic is in power saving mode. in power saving mode, only the power supply on/off detection function operates.
7 CXA1720Q electrical characteristics current consumption (ta=25 c, v cc =v) power supply monitoring system (ta=25 c) read system * when sw4 = a: vi = 10 mvp-p when sw4 = b: vi = 5 mvp-p measure- measure- item symbol conditions ment ment min. typ. max. unit circuit point current consumption for read iccr v cc =5 v 13.0 23.0 33.0 wg=? current consumption for iccwe v cc =5 v 8.0 14.0 20.0 ma write/erase wg=?? eg=? current consumption for iccps v cc =5 v 0.9 1.8 power saving ps=? measure- measure- item symbol conditions ment ment min. typ. max. unit circuit point power supply on/off detector vth 3.5 3.9 4.3 threshold voltage v power on output saturation vsp v cc =3.5 v 0.5 voltage i=1 ma measure- measure- item symbol conditions ment ment min. typ. max. unit circuit point pre-amplifier voltage gain gv0 f=100 khz side0 * sw4=a, b 38.1/ 41.6/ pre-amplifier voltage gain f=100 khz 1 g 44.1 40/46 47.6 db side1 * gv1 sw4=a, b sw1, 5=b pre-amplifier frequency response bw0 a v /a v0 =? db side0 * sw4=a, b pre-amplifier frequency response a v /a v1 =? db 1 g 5 mhz side1 * bw1 sw4=a, b sw1, 5=b pre-amplifier input conversion bandwidth=400 hz noise voltage en0 to 1 mhz vi=0, side0 sw4=b pre-amplifier input conversion bandwidth=400 hz 1 g 2.0 2.9 vrms noise voltage en1 to 1 mhz side1 sw4=b vi=0, sw1, 5=b
8 CXA1720Q read system (ta=25 c, v cc =5 v) ** when sw4 = a: vi = 60 mvp-p when sw4 = b: vi = 30 mvp-p *** read data output between 0.5 v to 2.4 v **** for vi = 0.25 mvp-p to 5m vp-p: sw4 = b (pre-amplifier voltage gain: 46 db) for vi = 0.5 mvp-p to 10 mvp-p: sw4 = a (pre-amplifier voltage gain: 40 db) measure- measure- item symbol conditions ment ment min. typ. max. unit circuit point pre-amplifier output offset voltage vi=0 (vs. vref) vofsp sw4=a, b, 1 f, g ?00 +500 mv sw1, 5=a, b pre-amplifier output voltage f=100 khz amplitude ** vop sw4=a, b, 1 g 1.8 vp-p sw1, 5=a, b filter differential output offset vofsf vi=0 1 d, e ?00 +100 mv voltage filter differential output voltage vof f=100 khz 1 d, e 2.8 vp-p amplitude vi=60 mvp-p time domain filter monostable etm1 r a =27 k b, c multivibrator no. 1 pulse width etm1 refer to fig. 1 1 a ?0 +10 % precision time domain filter monostable r a =27 k multivibrator no. 2 pulse width t2 refer to fig. 1 1 a 260 400 540 ns (fixed) read data output low voltage vol i ol =2 ma 1 a 0.5 v read data output high voltage voh i oh =?.4 ma 1 a 2.8 v read data output *** rise time tr r l =2 k 1 a 100 ns c l =20 pf read data output *** fall time tf r l =2 k 1 a 100 ns c l =20 pf vi=0.25 mvp-p to peak shift **** ps 10 mvp-p 1 a 1 % f=62.5 khz refer to fig. 1
9 CXA1720Q fig. 1 monostable multivibrator nos. 1 and 2 pulse width precision and peak shift measurement conditions monostable multivibrator no. 1 pulse width precision when hd = high: etm1 = ( t 1 ? ) 100 (%) 2.45 s when hd is low: etm1' = ( t 1 ? ) 100 (%) 1.25 s monostable multivibrator no. 2 pulse width = t 2 peak shift ps = 1 t a ? b 100 (%) 2 t a +t b c o m p a r a t o r i n p u t ( m e a s u r e m e n t p o i n t s b a n d c ) r e a d d a t a o u t p u t ( m e a s u r e m e n t p o i n t a ) t 1 t 2 t a t b 1 . 4 v
10 CXA1720Q read system (filters) (ta=25 c, v cc =5 v) ***** g pn = 20log 10 (v filterout /v preout ) v filterout : filter differential output voltage (n=1 to 4) measure- measure- item symbol conditions ment ment min. typ. max. unit circuit point peak frequency f o1 vi=3mvp-p hg=? 1 d, e 153.0 170.0 187.0 khz hd=??fc=? peak voltage gain ***** g p1 refer to fig. 2 1 g 3.6 5.5 7.1 1m/ at f o1 d, e outer refer to fig. 2 track frequency response (1) g 11 at 1 f o1 1 d, e ?.6 ?.1 ?.6 db 3 frequency response (2) g 12 refer to fig. 2 1 d, e ?5.0 ?3.1 ?1.5 at 3f o1 vi=3mvp-p peak frequency f o2 hg=?l 1 d, e 163.8 182.0 200.2 khz hd=??fc=? 1m/ peak voltage gain ***** g p2 refer to fig. 2 1 g 3.6 5.5 7.1 inner at f o2 d, e track refer to fig. 2 frequency response (1) g 21 at 1 f o2 1 d, e ?.6 ?.1 ?.6 db 3 frequency response (2) g 22 refer to fig. 2 1 d, e ?5.0 ?3.1 ?1.5 at 3f o2 peak frequency f o3 vi=3mvp-p hg=? 1 d, e 288.0 320.0 352.0 khz hd=??fc=? peak voltage gain ***** g p3 refer to fig. 2 1 g 3.6 5.5 7.1 2m/ at f o3 d, e outer refer to fig. 2 track frequency response (1) g 31 at 1 f o3 1 d, e ?.6 ?.1 ?.6 db 3 frequency response (2) g 32 refer to fig. 2 1 d, e ?5.0 ?3.1 ?1.5 at 3f o3 peak frequency f o4 vi=3mvp-p hg=? 1 d, e 310.5 345.0 379.5 khz hd=??fc=? peak voltage gain ***** g p4 refer to fig. 2 1 g 5.3 7.2 8.8 2m at f o4 d, e inner refer to fig. 2 track frequency response (1) g 41 at 1 f o4 1 d, e ?.6 ?.1 ?.6 db 3 frequency response (2) g 42 refer to fig. 2 1 d, e ?6.2 ?4.3 ?2.7 at 3f o4
( d b ) g p n g 1 n 1 3 f 0 f 0 3 f 0 f ( h z ) g 2 n ( n = 1 t o 4 ) 11 CXA1720Q fig. 2 filter frequency response measurement conditions
12 CXA1720Q write/erase system (ta=25 c, v cc =5 v) * write current output precision e w = ( i w ? ) 100 (%) 2.70 ma ** write current compensation current precision e wc = ( i w i w ? ) 100 (%) 0.90 ma i w : write current = ?? i w ? write current = ? logic input block measure- measure- item symbol conditions ment ment min. typ. max. unit circuit point write current output precision * ew wg=? 2 lkji ? +7 r w =4.3 k write current output unbalance dw wg=? 2 lkji ? +1 r w =4.3 k % write current compensation current wg=? precision ** ewc r w =4.3 k 2 lkji ?0 +10 r wc =12 k head i/o pin leak current for write ilkw wg=? 2 lkji 10 a head i/o pin saturation voltage vsw wg=? 2 l??? 1 v for write sw1=6 leak current for erase current ilke eg=? 2 mn 10 a switch output saturation voltage for erase eg=? current switch vse i=30 ma 2 m? 500 mv sw2=b measure- measure- item symbol conditions ment ment min. typ. max. unit circuit point digital low input voltage vld 2 bcde 0.8 fghp digital high input voltage vhd 2 bcde 2.0 fghp v schmitt-type digital low input vlsd 2 a 0.8 voltage schmitt-type digital high input vhsd 2 a 2.0 voltage digital low input current ild v l =0 v 2 abcd ?0 efghp a digital high input current ihd v h =5 v 2 abcd 10 efghp
13 CXA1720Q electrical characteristics measurement circuit 1 note) unless otherwise specified, switches are assumed to be set to ?? electrical characteristics measurement circuit 2 note) unless otherwise specified, switches are assumed to be set to ?? 1 2 3 4 5 6 7 8 2 2 2 1 2 0 1 9 1 8 1 7 2 3 2 4 1 6 1 5 1 4 1 3 1 2 9 1 0 1 1 2 5 2 6 2 7 2 8 2 9 3 0 3 1 3 2 f i l t e r o u t b c o m p i n b c o m p i n a a . g n d m m v a f i l t e r s e t v c c p o w e r o n w r i t e d a t a r e a d d a t a w r i t e c u r r e n t w r i t e g a t e e r a s e g a t e f i l t e r c o n t r o l w / c 1 s e t w / c 1 c o m p w / c 2 s e t w / c 2 c o m p d . g n d e r a s e o u t 0 e r a s e o u t 1 h e a d 0 a h e a d 0 b h e a d 1 a h e a d 1 b p r e a m p o u t v r e f f i l t e r o u t a c x a 1 7 2 0 q c b a d g f e 0 . 1 a b s w 4 1 / 2 v 1 1 / 2 v 1 s w 5 a b a b 4 . 3 k 1 2 k 4 . 3 k 1 2 k s w 1 s w 2 a b a b s w 3 a b 3 . 2 k 2 7 k 5 v 3 3 0 0 p 3 3 0 0 p p o w e r s a v e h i g h d e n s i t y h i g h g a i n s i d e 1 g 4 . 3 k 1 2 k 4 . 3 k 1 2 k 3 . 2 k 2 7 k 5 v 0 . 1 l k j i h 2 . 2 k s w 1 a b 2 . 2 k 2 . 2 k 2 . 2 k a b a b a b 1 2 3 4 5 6 7 8 2 2 2 1 2 0 1 9 1 8 1 7 2 3 2 4 1 6 1 5 1 4 1 3 1 2 9 1 0 1 1 2 5 2 6 2 7 2 8 2 9 3 0 3 1 3 2 f i l t e r o u t b c o m p i n b c o m p i n a a . g n d m m v a f i l t e r s e t v c c p o w e r o n r e a d d a t a w r i t e c u r r e n t w r i t e g a t e e r a s e g a t e s i d e 1 f i l t e r c o n t r o l w / c 1 s e t w / c 1 c o m p w / c 2 s e t w / c 2 c o m p d . g n d e r a s e o u t 0 e r a s e o u t 1 h e a d 0 a h e a d 0 b h e a d 1 a h e a d 1 b p r e a m p o u t v r e f f i l t e r o u t a c x a 1 7 2 0 q l ' k ' j ' i ' p a b c d e f m n 1 0 0 k 3 0 m a a b s w 2 1 0 0 k 3 0 m a a b m ' n ' h i g h g a i n p o w e r s a v e w r i t e d a t a h i g h d e n s i t y
14 CXA1720Q description of operation (1) read system pre-amplifier the pre-amplifier amplifies input signals. the voltage gain can be switched between 40 db and 46 db, using pin 20. filters the filters differentiate the signals amplified by the pre-amplifier. the high-band noise components are attenuated by the low-pass filter. the filters can be switched among four modes, depending on the settings of pins 8 and 9. in 1m/outer track mode, the peak frequency f o1 is set by external resistor r f . f o for the other three modes is switched by the internal settings of the ic, with f o1 used as a reference (1.00). the filters are explained below. 1) active filter block filter characteristics table 1 the formula for the peak frequency f 01 for 1m/outer track mode is shown below: f 01 = 527/r f + 5.8 (khz) f 01 : peak frequency in 1m/outer track mode r f : filter setting resistance (k ) the relationship between f01 and f0 in the four modes is as follows: 1m/outer track: f 01 = 1.0 f 01 1m/inner track: f 02 = 1.07 f 01 2m/outer track: f 03 = 1.88 f 01 2m/inner track: f 04 = 2.03 f 01 note that these filters can be customized. customization is explained on pages 17 and 18. 1 7 1 6 1 9 b p f l p f h p f a m p . p r e - a m p l i f i e r o u t p u t s e c o n d a r y t e r t i a r y p r i m a r y f i l t e r o u t p u t a f i l t e r o u t p u t b f o b = 1 . 2 x f c l f c l ; v a r i a b l e f c h = 5 k h z g a i n ; 8 . 0 d b q = 0 . 5 7 7 q ; v a r i a b l e p r e - a m p l i f i e r o u t p u t pin 8 pin 9 lpf characteristics f o ratio h h 1m/outer track mode: butterworth 1.00 l h 1m/inner track mode: butterworth 1.07 h l 2m/outer track mode: butterworth 1.88 l l 2m/inner track mode: chebyshev 1 db ripple 2.03
15 CXA1720Q comparator the comparator detects the crosspoint of the filter differential output. time domain filter the time domain filter converts the comparator output to read data. this filter is equipped with two monostable multivibrators. monostable multivibrator no. 1 eliminates unnecessary pulses, and monostable multivibrator no. 2 determines the pulse width of read data. the monostable multivibrator no. 1 pulse width t a is determined by the resistor r a between pin 12 and a.gnd. t a can be switched as follows by the setting of pin 9: high density = ? t a low = 84r a + 180 (ns) r a (k ) high density = ? t a high = 42r a + 110 (ns) the pulse width for monostable multivibrator no. 2 is fixed at 400 ns. (2) write system write data input through pin 2 is frequency-divided by the t flip-flop and generates the head recording current. the recording current can be switched by the setting of pin 9. the write current iw is set by the resistor r w connected between pin 25 and v cc and between pin 27 and v cc . i w = 11.6/r w (ma) r w (k ) furthermore, the write current compensation i wc is set by the resistor r wc connected between pin 25 and pin 26, and between pin 27 and pin 28. i wc = 10.8/r wc (ma) r wc (k ) (3) erase system pins 30 and 31 are open collector outputs; the erase current is set by the resistance between these pins and the erase head. (4) power on/off detection system the power on/off detection system detects a reduced voltage. when v cc is below the stipulated voltage, the write system and erase system cease operation, disabling the write and erase functions notes on operation select the voltage gain so that the pre-amplifier output amplitude is 1 vp-p or less. if the pre-amplifier output amplitude exceeds 1 vp-p, the filter output waveform becomes distorted. observe the following points when mounting this ic. connect a v cc decoupling capacitor of approximately 0.1 f close to the ic. the ground should be as large as possible.
16 CXA1720Q application circuit (for 1m/2m devices) f i l t e r o u t b c o m p i n b c o m p i n a a . g n d m m v a f i l t e r s e t v c c h i g h d e n s i t y p o w e r o n w r i t e d a t a r e a d d a t a w r i t e c u r r e n t w r i t e g a t e e r a s e g a t e s i d e 1 f i l t e r c o n t r o l w / c 1 s e t w / c 1 c o m p w / c 2 s e t w / c 2 c o m p d . g n d e r a s e o u t 0 e r a s e o u t 1 p o w e r s a v e h e a d 0 a h e a d 0 b h e a d 1 a p r e a m p o u t v r e f f i l t e r o u t a w r i t e d r i v e r e r a s e d r i v e r p o w e r m o n i t o r c o n t r o l l o g i c t i m e d o m a i n f i l t e r c o m p f i l t e r d i f f + l p f ( b p f ) p r e a m p 1 2 3 4 5 6 7 8 1 6 1 5 1 4 1 3 1 2 9 1 0 1 1 2 2 2 1 2 0 1 9 1 8 1 7 2 3 2 4 r a 2 7 k r f 3 . 2 k 5 v c b 3 3 0 0 p c a 3 3 0 0 p c r e f 0 . 1 2 5 2 6 2 7 2 8 2 9 3 0 3 1 3 2 r e 0 r e 1 r w 1 r w 2 r w c 1 r w c 2 h e a d 1 b h i g h g a i n application circuits shown are typical examples illustrating the operation of the devices. sony cannot assume responsibility fo r any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same .
17 CXA1720Q customization filter frequency response in 2m/inner track mode, the filter frequency response can be changed as shown below. b . p . f q = 0 . 5 7 7 ( d i f f e r e n t i a l c h a r a c t e r i s t i c s ) l . p . f t e r t i a r y b u t t e r w o r t h n o . 2 l . p . f t e r t i a r y c h e b y s h e v 1 d b r p ( h i g h - b a n d n o i s e c u t - o f f ) ( c o m p r e h e n s i v e c h a r a c t e r i s t i c s ) n o . 3
18 CXA1720Q filter customization selections/combinations in filter settings, use the lpf cut-off frequency f c1 in 1m/outer track mode as 1.00 as shown in table 1 to select fc ratios and lpf types for the other three modes. the 1m/outer track to 2m/outer track modes for the lpf are fixed to butterworth, while either butterworth or chebyshev 1 db ripple can be selected in 2m/inner track mode. note that the bpf center frequency f ob is fixed at 1.2 times the lpf cut-off frequency fc. in addition, the relationship between the peak frequencies fo and fc in regards to the comprehensive characteristics is as follows, depending on differences in lpfs. butterworth characteristics: f c = 1.28fo chebyshev 1 db ripple characteristics: f c = 1.12fo table 1 lpf fc ratios and types note) the boxed item indicates the setting for the CXA1720Q. mode lpf type f c ratio when f c1 is assumed as 1.00 1m/outer track butterworth 1.00 1.07 1.14 1.23 1.33 1.45 1m/inner track butterworth 1.60 2.00 1.33 1.39 1.45 1.52 1.60 2m/outer track butterworth 1.68 1.78 1.88 2.00 2.13 2.29 2.46 2.67 butterworth 1.33 1.39 1.45 1.52 1.60 2m/inner track chebyshev 1.68 1.78 1.88 2.00 2.13 (1 db ripple) 2.29 2.46 2.67
19 CXA1720Q n o r m a l i z e d p r e - a m p l i f i e r v o l t a g e g a i n a n d p h a s e v s . f r e q u e n c y v c c = 5 v , t a = 2 5 ? c w h e n h d = h i g h , l o w n o r m a l i z e d p r e - a m p l i f i e r v o l t a g e g a i n ( d b ) f - f r e q u e n c y ( h z ) p h a s e ( d e g r e e ) p h a s e v o l t a g e g a i n f i l t e r c h a r a c t e r i s t i c s i n t h e f o u r m o d e s ( t h e s e c h a r a c t e r i s t i c s a r e b a s e d o n p r e - a m p l i f i e r o u t p u t . 0 d b = p r e - a m p l i f i e r o u t p u t l e v e l ) 0 2 4 6 8 1 0 1 0 k 1 0 0 k 1 m 1 0 m 1 0 0 m 0 3 0 6 0 9 0 1 2 0 1 5 0 1 m / o u t e r t r a c k n o r m a l i z e d f i l t e r v o l t a g e g a i n ( d b ) f 0 1 = 1 7 0 ( k h z ) f r e q u e n c y ( h z ) p h a s e ( d e g r e e ) v o l t a g e g a i n p h a s e 1 0 k 5 0 k 1 0 0 k 3 0 0 k 1 m 3 m 1 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 2 0 0 1 5 0 1 0 0 5 0 0 5 0 1 0 0 2 0 0 1 5 0 1 m / i n n e r t r a c k n o r m a l i z e d f i l t e r v o l t a g e g a i n ( d b ) f 0 2 = 1 8 2 ( k h z ) f r e q u e n c y ( h z ) p h a s e ( d e g r e e ) v o l t a g e g a i n p h a s e 1 0 k 5 0 k 1 0 0 k 3 0 0 k 1 m 3 m 1 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 2 0 0 1 5 0 1 0 0 5 0 0 5 0 1 0 0 2 0 0 1 5 0 2 m / o u t e r t r a c k n o r m a l i z e d f i l t e r v o l t a g e g a i n ( d b ) f 0 3 = 3 2 0 ( k h z ) f r e q u e n c y ( h z ) p h a s e ( d e g r e e ) v o l t a g e g a i n p h a s e 1 0 k 5 0 k 1 0 0 k 3 0 0 k 1 m 3 m 1 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 2 0 0 1 5 0 1 0 0 5 0 0 5 0 1 0 0 2 0 0 1 5 0 2 m / i n n e r t r a c k n o r m a l i z e d f i l t e r v o l t a g e g a i n ( d b ) f 0 4 = 3 4 5 ( k h z ) f r e q u e n c y ( h z ) p h a s e ( d e g r e e ) v o l t a g e g a i n p h a s e 1 0 k 5 0 k 1 0 0 k 3 0 0 k 1 m 3 m 1 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 2 0 0 1 5 0 1 0 0 5 0 0 5 0 1 0 0 2 0 0 1 5 0 v c c = 5 v , t a = 2 5 ? c r f = 3 . 2 k w v c c = 5 v , t a = 2 5 ? c r f = 3 . 2 k w v c c = 5 v , t a = 2 5 ? c r f = 3 . 2 k w v c c = 5 v , t a = 2 5 ? c r f = 3 . 2 k w
20 CXA1720Q n o r m a l i z e d p r e - a m p l i f i e r v o l t a g e g a i n + f i l t e r v o l t a g e g a i n v s . a m b i e n t t e m p e r a t u r e t a - a m b i e n t t e m p e r a t u r e ( ? c ) f = 1 0 0 k h z v c c = 5 v v i n = 1 0 m v p - p ( h g = " h " ) v i n = 5 m v p - p ( h g = " l " ) n g v = g v / g v ( t a = 2 5 ? c ) 1 . 5 0 1 . 0 0 0 . 5 0 2 0 0 2 0 4 0 6 0 8 0 1 1 n o r m a l i z e d p r e - a m p l i f i e r v o l t a g e g a i n + f i l t e r v o l t a g e g a i n v s . s u p p l y v o l t a g e v c c - s u p p l y v o l t a g e ( v ) t a = 2 5 ? c f = 1 0 0 k h z v i n = 1 0 m v p - p ( h g = " h " ) v i n = 5 m v p - p ( h g = " l " ) n g v = g v / g v ( v c c = 5 v ) 1 . 5 0 1 . 0 0 0 . 5 0 4 . 0 5 . 0 6 . 0 1 1 r f 3 . 2 k w v c c n o r m a l i z e d m o n o s t a b l e m u l t i v i b r a t o r n o . 1 p u l s e w i d t h v s . a m b i e n t t e m p e r a t u r e n t a - n o r m a l i z e d m o n o s t a b l e m u l t i v i b r a t o r n o . 1 p u l s e w i d t h t a - a m b i e n t t e m p e r a t u r e ( ? c ) v c c = 5 v n t a = t a / t a ( t a = 2 5 ? c ) w h e n h d = h i g h , l o w 1 . 0 5 1 . 0 0 0 . 9 5 1 2 r a 2 7 k w 2 0 0 2 0 4 0 6 0 8 0 r f 3 . 2 k w v c c n g v - n o r m a l i z e d p r e - a m p l i f i e r v o l t a g e g a i n + f i l t e r v o l t a g e g a i n n g v - n o r m a l i z e d p r e - a m p l i f i e r v o l t a g e g a i n + f i l t e r v o l t a g e g a i n
21 CXA1720Q m o n o s t a b l e m u l t i v i b r a t o r n o . 1 p u l s e w i d t h v s . r a t a - m o n o s t a b l e m u l t i v i b r a t o r n o . 1 p u l s e w i d t h ( s ) r a ( k w ) v c c = 5 v t a = 2 5 ? c 1 0 3 5 1 0 5 0 1 0 0 1 2 v c c - s u p p l y v o l t a g e ( v ) 1 . 0 5 1 . 0 0 0 . 9 5 4 . 0 5 . 0 6 . 0 n o r m a l i z e d r e a d d a t a p u l s e w i d t h v s . a m b i e n t t e m p e r a t u r e n t b - n o r m a l i z e d r e a d d a t a p u l s e w i d t h t a - a m b i e n t t e m p e r a t u r e ( ? c ) v c c = 5 v n t b = t b / t b ( t a = 2 5 ? c ) 1 . 0 5 1 . 0 0 0 . 9 5 1 2 r a 2 7 k w 2 0 0 2 0 4 0 6 0 8 0 n o r m a l i z e d m o n o s t a b l e m u l t i v i b r a t o r n o . 1 p u l s e w i d t h v s . s u p p l y v o l t a g e n t a - n o r m a l i z e d m o n o s t a b l e m u l t i v i b r a t o r n o . 1 p u l s e w i d t h t a = 2 5 ? c n t a = t a / t a ( t a = 2 5 ? c ) w h e n h d = h i g h , l o w 5 1 0 . 3 t a l o w = 8 4 r a + 1 8 0 ( n s ) t a h i g h = 4 2 r a + 1 1 0 ( n s ) r a ( k w ) r a t a l o w t a h i g h
22 CXA1720Q n o r m a l i z e d w r i t e c u r r e n t v s . a m b i e n t t e m p e r a t u r e n i w - n o r m a l i z e d w r i t e c u r r e n t t a - a m b i e n t t e m p e r a t u r e ( ? c ) v c c = 5 v n i w = i w / i w ( t a = 2 5 ? c ) 1 . 0 5 1 . 0 0 0 . 9 5 2 0 0 2 0 4 0 6 0 8 0 2 5 n o r m a l i z e d r e a d d a t a p u l s e w i d t h v s . s u p p l y v o l t a g e n t b - n o r m a l i z e d r e a d d a t a p u l s e w i d t h v c c - s u p p l y v o l t a g e ( v ) t a = 2 5 ? c n t b = t b / t b ( v c c = 5 v ) 1 . 0 5 1 . 0 0 0 . 9 5 4 . 0 5 . 0 6 . 0 n o r m a l i z e d w r i t e c u r r e n t v s . s u p p l y v o l t a g e n i w - n o r m a l i z e d w r i e t c u r r e n t v c c - s u p p l y v o l t a g e ( v ) 1 . 0 5 1 . 0 0 0 . 9 5 4 . 0 5 . 0 6 . 0 2 6 2 7 2 8 r w c 1 r w c 2 1 2 k 1 2 k r w 1 4 . 3 k r w 2 4 . 3 k v c c v c c 2 5 2 6 r w c 1 r w c 2 1 2 k 1 2 k r w 1 4 . 3 k r w 2 4 . 3 k v c c v c c t a = 2 5 ? c n i w = i w / i w ( v c c = 5 v ) 2 7 2 8
23 CXA1720Q n o r m a l i z e d w r i t e c o m p e n s a t i o n c u r r e n t v s . a m b i e n t t e m p e r a t u r e n i w c - n o r m a l i z e d w r i t e c o m p e n s a t i o n c u r r e n t t a - a m b i e n t t e m p e r a t u r e ( ? c ) v c c = 5 v n i w c = i w c / i w c ( t a = 2 5 ? c ) 1 . 0 5 1 . 0 0 0 . 9 5 2 0 0 2 0 4 0 6 0 8 0 2 5 w r i t e c u r r e n t v s . r w i w - w r i t e c u r r e n t ( m a ) r w ( k w ) v c c = 5 v t a = 2 5 ? c i w = 1 1 . 6 / r w ( m a ) r w ( k w ) 1 0 . 0 5 . 0 1 . 0 1 k 5 k 1 0 k n o r m a l i z e d w r i t e c o m p e n s a t i o n c u r r e n t v s . s u p p l y v o l t a g e n i w c - n o r m a l i z e d w r i e t c o m p e n s a t i o n c u r r e n t v c c - s u p p l y v o l t a g e ( v ) 1 . 0 5 1 . 0 0 0 . 9 5 4 . 0 5 . 0 6 . 0 2 6 2 7 2 8 r w c 1 r w c 2 1 2 k 1 2 k r w 1 4 . 3 k r w 2 4 . 3 k v c c v c c r w c 1 r w c 2 1 2 k 1 2 k r w 1 4 . 3 k r w 2 4 . 3 k v c c v c c t a = 2 5 ? c n i w c = i w c / i w c ( v c c = 5 v ) 2 5 2 7 r w 1 r w 2 v c c v c c 2 5 2 6 2 7 2 8
24 CXA1720Q p o w e r s u p p l y o n / o f f d e t e c t o r t h r e s h o l d v o l t a g e v s . a m b i e n t t e m p e r a t u r e v t h - p o w e r s u p p l y o n / o f f d e t e c t o r t h r e s h o l d v o l t a g e ( v ) t a - a m b i e n t t e m p e r a t u r e ( ? c ) 4 . 2 3 . 9 3 . 7 2 0 0 2 0 4 0 6 0 8 0 w r i t e c u r r e n t c o m p e n s a t i o n v s . r w c i w c - w r i t e c u r r e n t c o m p e n s a t i o n ( m a ) r w c ( k w ) v c c = 5 v t a = 2 5 ? c i w c = 1 0 . 8 / r w c ( m a ) r w c ( k w ) 1 0 . 0 1 . 0 0 . 1 1 . 0 1 0 . 0 1 0 0 . 0 n o r m a l i z e d f i l t e r p e a k f r e q u e n c y v s . a m b i e n t t e m p e r a t u r e n f 0 - n o r m a l i z e d f i l t e r p e a k f r e q u e n c y 1 . 0 5 1 . 0 0 0 . 9 5 4 . 0 5 . 0 6 . 0 1 1 r f 3 . 2 k v c c v c c = 5 v n f 0 = f 0 / f 0 ( t a = 2 5 ? c ) ( k w ) 2 5 2 6 2 7 2 8 r w c 1 r w c 2 r w 1 4 . 3 k r w 2 4 . 3 k v c c v c c o n t h r e s h o l d v o l t a g e o f f t h r e s h o l d v o l t a g e 4 . 1 4 . 0 3 . 8 t a - a m b i e n t t e m p e r a t u r e ( ? c )
25 CXA1720Q 1 m / o u t e r t r a c k p e a k f r e q u e n c y v s . r f 1 f 0 1 - 1 m / o u t e r t r a c k p e a k f r e q u e n c y ( k h z ) 2 5 0 2 . 0 3 . 0 4 . 0 n o r m a l i z e d f i l t e r p e a k f r e q u e n c y v s . s u p p l y v o l t a g e c h a r a c t e r i s t i c s n f 0 - n o r m a l i z e d f i l t e r p e a k f r e q u e n c y v c c - s u p p l y v o l t a g e ( v ) 1 . 0 5 1 . 0 0 0 . 9 5 4 . 0 5 . 0 6 . 0 1 1 r f 3 . 2 k v c c v c c = 5 v n f 0 = f 0 / f 0 ( t a = 2 5 ? c ) 2 0 0 1 5 0 1 1 r f v c c v c c = 5 v t a = 2 5 ? c r f ( k w ) f 0 1 = 5 2 7 / r f + 5 . 8 ( k h z )
s o n y c o d e e i a j c o d e j e d e c c o d e p a c k a g e m a t e r i a l l e a d t r e a t m e n t l e a d m a t e r i a l p a c k a g e m a s s e p o x y r e s i n s o l d e r p l a t i n g 4 2 a l l o y 3 2 p i n q f p ( p l a s t i c ) 9 . 0 0 . 2 7 . 0 0 . 1 1 . 5 0 . 1 5 ( 8 . 0 ) 0 . 1 0 . 1 + 0 . 2 + 0 . 3 5 + 0 . 3 0 . 5 0 0 . 1 2 7 0 . 0 5 + 0 . 1 0 t o 1 0 0 . 8 0 . 3 0 . 1 + 0 . 1 5 1 8 9 3 2 1 6 1 7 2 4 2 5 m 0 . 2 4 0 . 2 g q f p - 3 2 p - l 0 1 q f p 0 3 2 - p - 0 7 0 7 0 . 1 package outline unit : mm CXA1720Q 26

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