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july 2011 ? 2010 fairchild semiconductor corporation www.fairchildsemi.com FAN3850A ? rev. 3.0.6 FAN3850A microphone pre-amplifier with digital output FAN3850A microphone pre-amplifier with digital output features optimized for mobile handset and notebook pc microphone applications accepts input from electret condenser microphones (ecm) pulse density modulation (pdm) output standard 5-wire digital interface 16db and 19db gain versions available (1) low input capacitance, high psr, 20khz pre-amplifier low-power 1.5a sleep mode typical 470a supply current snr of 62/61db(a) for 16/19db gain respectively total harmonic distortion 0.02% input clock frequency range of 1-4mhz integrated low drop-out regulator (ldo) small 1.26mm x 0.86mm 6-ball wlcsp package description the FAN3850A integrates a pre-amplifier, ldo, and adc that converts electret condenser microphone (ecm) outputs to digital pulse density modulation (pdm) data streams. the pre-amplifier accepts analog signals from the ecm and drives an over-sampled sigma delta analog-to-digital converter (adc) and outputs pdm data. the pdm digital audio has the advantage of noise rejection and easy interface to mobile handset processors. the FAN3850A features an integrated ldo and is powered from the system supply rails up to 3.63v, with low power consumption of only 0.85mw and less than 20w in power-down mode. applications electret condenser micropho nes with digital output mobile handset headset accessories personal computer (pc) . ordering information part number operating temperature range package packing method FAN3850Auc16x -30c to +85c 6 ball, wafer-level chip-scale package (wlcsp) 3000 units on tape & reel FAN3850Auc19x -30c to +85c 6-ball, wa fer-level chip-scale package (wlcsp) 3000 units on tape & reel note: 1. alternate gain options are possible. please contact fairchild.
? 2010 fairchild semiconductor corporation www.fairchildsemi.com FAN3850A ? rev. 3.0.6 2 FAN3850A microphone pre-amplifier with digital output block diagram figure 1. block diagram pin configuration figure 2. pin assignments pin definitions pin# name type description a1 clock input clock input b1 gnd input ground pin c1 data output pdm output C 1 bit adc a2 select input rising or falling clock edge select b2 input input microphone input c2 vdd input device power pin ldo pre-amp adc input sleep mode ctrl data select clock v dd gnd
? 2010 fairchild semiconductor corporation www.fairchildsemi.com FAN3850A ? rev. 3.0.6 3 FAN3850A microphone pre-amplifier with digital output absolute maximum ratings stresses exceeding the absolute maximum ratings may dam age the device. the device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. in addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. the absolute maximum ratings are stress ratings only. symbol parameter min. max. unit v dd dc supply voltage -0.3 4.0 v v io analog and digital i/o -0.3 v cc +0.3 v esd human body model, jesd22 -a114, all pins except microphone input 7 kv human body model, jesd22-a114 C microphone input 300 v note: 2. this device is fabricated using cmos technology an d is therefore susceptible to damage from electrostatic discharges. appropriate precautions must be taken during handling and storage of this device to prevent exposure to esd. reliability information symbol parameter min. typ. max. unit t j junction temperature +150 c t stg storage temperature range -65 +125 c t rflw peak reflow temperature +260 c ja thermal resistance, jedec standard, multilayer test boards, still air 90 c/w recommended operating conditions the recommended operating conditions table defines the conditions for actual device operation. recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. fairchild does not recommend exceeding them or designing to absolute maximum ratings. symbol parameter min. typ. max. unit t a operating temperature range -30 +85 c v dd supply voltage range 1.64 1.80 3.63 v t rf-clk clock rise and fall time 10 ns
? 2010 fairchild semiconductor corporation www.fairchildsemi.com FAN3850A ? rev. 3.0.6 4 FAN3850A microphone pre-amplifier with digital output device specific electrical characteristics unless otherwise specified, all limits are guaranteed for t a =25c, v dd =1.8v, v in =94db (spl), and f clk =2.4mhz. duty cycle=50% and c mic =15pf. symbol parameter FAN3850Auc16x FAN3850Auc19x unit min. typ. max. min. typ. max. snr signal-to-noise ratio f in =1khz (1pa), a-weighted 62 61 db(a) e n total input rms noise (4) 20hz to 20khz, a-weighted 5.74 6.80 4.45 5.30 v rms v in maximum input signal f in =1khz, thd+n < 10%, level=0v 448 317 mv pp electrical characteristics unless otherwise specified, all limits are guaranteed for t a =25c, v dd =1.8v, v in =94db (spl), and f clk =2.4mhz. duty cycle=50% and c mic =15pf. symbol parameter condition min. typ. max. unit v dd supply voltage range 1.64 1.80 3.63 v i dd supply current input=ac coupled to gnd, clock=on, no load 470 a i sleep sleep mode current f clk =gnd 1.5 8.0 a psr power supply rejection (4) input=ac coupled to gnd, test signal on v dd =217hz square wave and broadband noise (3) , both 100mv p-p -74 dbfs in nom nominal sensitivity (5) input=94dbspl (1pa) -26 dbfs thd total harmonic distortion (6) f in =1khz, input=-26dbfs 0.02 0.20 % thd+n thd and noise (4) 50hz f in 1khz, input=-20dbfs 0.2 1.0 % f in =1khz, input=-5dbfs 1.0 5.0 f in =1khz, input=0dbfs 5.0 10.0 c in input capacitance (7) input 0.2 pf r in input resistance (7) input >100 g v il clock & select input logic low level 0.3 v v ih clock & select input logic high level 1.5 v dd +0.3 v v ol data output logic low level 0.35*v dd v v oh data output logic high level 0.65*v dd v v out acoustic overload point (7) thd < 10% 120 dbspl continued on the following page?
? 2010 fairchild semiconductor corporation www.fairchildsemi.com FAN3850A ? rev. 3.0.6 5 FAN3850A microphone pre-amplifier with digital output electrical characteristics (continued) unless otherwise specified, all limits are guaranteed for t a =25c, v dd =1.8v, v in =94db(spl), and f clk =2.4mhz. duty cycle=50% and c mic =15pf. symbol parameter condition min. typ. max. unit t a time from clock transition to data becoming valid on falling edge of clock, select=gnd, c load =15pf 18 43 ns t b time from clock transition to data becoming high-z on rising edge of clock, select=gnd, c load =15pf 0 5 16 ns t a time from clock transition to data becoming valid on rising edge of clock, select=v dd , c load =15pf 18 56 ns t b time from clock transition to data becoming high-z on falling edge of clock, select=v dd , c load =15pf 0 5 16 ns f clk input clock frequency (8) active mode 1.0 2.4 4.0 mhz clk dc clock duty cycle (4) 40 50 60 % t wakeup wake-up time (9) f clk =2.4mhz 0.35 2.00 ms t fallasleep fall-asleep time (10) f clk =2.4mhz 0 0.01 1.00 ms c load load capacitance on data 100 pf notes: 3. pseudo-random noise with triangular probability density function. bandwidth up to 10mhz. 4. guaranteed by characterization. 5. assuming that 120db(spl) is mapped to 0dbfs. 6. assuming an input of -45dbv 7. guaranteed by design. 8. all parameters are tested at 2.4mhz. frequency range guaranteed by characterization. 9. device wakes up when f clk 300khz. 10. device falls asleep when f clk 70khz. figure 3. interface timing
? 2010 fairchild semiconductor corporation www.fairchildsemi.com FAN3850A ? rev. 3.0.6 6 FAN3850A microphone pre-amplifier with digital output typical performance characteristics unless otherwise specified, all limits are guaranteed for t a =25c, v dd =1.8v, v in =94db(spl), f clk =2.4mhz, and duty cycle=50%. figure 4. noise vs. frequency figure 5. thd, sinda, and snr vs. input amplitude 10 1 10 2 10 3 10 4 10 5 10 6 -160 -140 -120 -100 -80 -60 -40 -20 frequency [hz] amplitude [dbfs] amplitude spectrum [dbfs], fo = 1000.2135 hz, fs = 2.400000 mhz, snr = 56.89 db, snr = 60.88 db(a), thd = 0.008 % fo(0)= -26.15 dbfs fo(1)= -110.28 dbfs fo(2)= -116.40 dbfs fo(3)= -120.45 dbfs fo(4)= -125.03 dbfs integrated noise = -87.03 dbfs(a) spur = -101.34 dbfs, sfdr = 75.19 dbc noise noise(a) signal filename: FAN3850A-1-bd9 2 m-20110125t122914.dat thd = 81.95 db snr = 60.88 dbc(a) sinad = 56.87 db enob = 13.50 n = 2097152 pts blackman window
? 2010 fairchild semiconductor corporation www.fairchildsemi.com FAN3850A ? rev. 3.0.6 7 FAN3850A microphone pre-amplifier with digital output typical performance characteristics (continued) figure 6. thd, sinad, and snr vs. output level figure 7. gain vs. temperature (nominal temperature= 25c) temp(c) delta(db) 40 0.1971 30 0.1644 20 0.1260 10 0.0954 0 0.0657 10 0.0359 20 0.0139 25 0.0000 30 0.0097 40 0.0344 50 0.0514 60 0.0739 70 0.0998 80 0.1183 85 0.1271 403020100 1020304050607080 4 3 2 1 0 1 2 3 4 junctiontemperaturetjc gain(db)
? 2010 fairchild semiconductor corporation www.fairchildsemi.com FAN3850A ? rev. 3.0.6 8 FAN3850A microphone pre-amplifier with digital output applications information figure 8. mono microphone application circuit figure 9. stereo micr ophone application circuit l/r decimation v dd interpolation select speaker applications software adc select clk pre - amp sdi adc input sdo pre - amp data input clock v dd serial port clock audio output data low pass filter noise shaper decimation noise shaper low pass filter input serial port clk pre- amp applications software adc interpolation clock sdi data speaker v dd select sdo audio output l/r
? 2010 fairchild semiconductor corporation www.fairchildsemi.com FAN3850A ? rev. 3.0.6 9 FAN3850A microphone pre-amplifier with digital output applications information (continued) diaphragm backplate a irgap electre t FAN3850A input clock data select v dd gnd figure 10. mic element drawing a 0.1f decoupling capacitor is required for v dd . it can be located inside the microphone or on the pcb very close to the vdd pin. due to high input impedance, care should be taken to remove all flux used during th e reflow soldering process. a 100 resistance is recommended on the clock output of the device driving the FAN3850A to minimize ringing and improve signal integrity. for optimal psr, route a trace to the vdd pin. do not place a vdd plane under the device.
? 2010 fairchild semiconductor corporation www.fairchildsemi.com FAN3850A ? rev. 3.0.6 10 FAN3850A microphone pre-amplifier with digital output physical dimensions figure 11. 6-ball, wafer-level chip-scale package (wlcsp) FAN3850A external product dimensions product id d e x y all options 1.260mm 0.860mm 0.145mm 0.145mm ball composition: sn97.5-ag2.5 package drawings are provided as a service to customers considering fairchild components. drawings may change in any manner without notice. please note the revision and/or date on the drawing and contact a fairchild semiconductor representative to ve rify or obtain the most recent version. package specifications do not expand fairchild?s worldwide terms and conditions, specificall y the warranty therein, which covers fairchild products. always visit fairchild semiconductors online packaging area for the most recent packaging drawings and tape and reel specifications. http://www.fairchildsemi.com/packaging/ . bottom view top view 1 2 a b c 6x 0.005 c a b (x) +/-0.018 (y) +/-0.018 ?0.1200.010 f e d b a pin a1 a rea f 2x 2x (?0.120) cu pad side views 0.06 c d c seating plane 0.03 c 0.03 c notes: a . no jedec registration applies. b. dimensions are in millimeters. c. dimensions and tolerances per asme y14.5m, 1994. d. datum c, the seating plane is defined by the spherical crowns of the balls. e. package typical height is 273 microns 23 microns (254-300 microns). f. for dimensions d, e, x, and y see product datasheet. g. drawing filename: uc006ahrev3. e 0.0800.010 0.570 0.485 0.1970.013 0.300 0.254 0.570 0.485 recommended land pattern (nsmd) (?0.220) solder mask a 1 0.01 c
? 2010 fairchild semiconductor corporation www.fairchildsemi.com FAN3850A ? rev. 3.0.6 11 FAN3850A microphone pre-amplifier with digital output

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