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october 2011 ? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan3850t ? rev. 3.0.0 fan3850t ? microphone pre-amp lifier with temperature compen sation and digital output fan3850t microphone pre-amplifier with temperature compensation and digital output features ? optimized for mobile handset and notebook pc microphone applications ? accepts input from electret condenser microphones ? pulse density modulation (pdm) output ? standard 5-wire digital interface ? amplifier gain: 15.7db ? negative temperature coefficient to compensate for ecm positive temperature coefficient ? low input capacitance, high psr, 20khz pre-amplifier ? low-power, 1.5a sleep mode ? typical 420a supply current ? signal to noise ratio of 62.4db(a) ? total harmonic distortion: 0.01% ? input clock frequency range of 1-4mhz ? integrated low drop-out regulator (ldo) ? small 1.26mm x 0.86mm 6-ball wlcsp applications ? electret condenser microphones with digital output ? mobile handsets ? headset accessories ? personal computers (pc) description the fan3850t integrates a pre-amplifier, ldo, and analog-to-digital converter (adc) to convert 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 adc and outputs pdm data. the pdm digital audio has the advantage of noise rejection and interface-to-mobile handset processors. the fan3850t is powered from the system supply rails up to 3.63v, with a low power consumption of only 0.85mw, and less than 20 w in power-down mode. the device compensates for the temperature variation of the microphone element to achieve a flat sensitivity response over-temperature. figure 1. block diagram ordering information part number gain option operating temperature range package packing method FAN3850TUC15X35 15.7db -30c to +85c 6-ball, wafer-level chip-scale package (wlcsp) 3000 unit tape & reel note: 1. alternate gain options and temperat ure coefficient slopes are possible. pl ease contact a fairchild representative. ldo pre-amp ? ????? adc input sleep mode ctrl data select clock gnd
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan3850t ? rev. 3.0.0 2 fan3850t ? microphone pre-amp lifier with temperature compen sation and digital output pin configuration figure 2. pin configuration (top view) pin definitions pin# name type description a1 clock input clock input b1 gnd input ground pin c1 data output pdm output ? 1-bit adc a2 select input rising or falling clock-edge select b2 input input microphone input c2 vdd input device power pin
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan3850t ? rev. 3.0.0 3 fan3850t ? microphone pre-amp lifier with temperature compen sation and 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 st ressing the parts to these levels is not recommended. in addition, extended exposure to stresses above the recomm ended 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 (2) , all pins except microphone input 7 kv human body model, jesd22-a114 (2) , microphone input 300 v note: 2. this device is fabricated using cm os technology and is therefore suscept ible to damage from electrostatic discharges. appropriate precautions must be taken durin g 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 reflow 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 th e conditions for actual device operation. recommended operating conditions are specified to en sure optimal performance to the datash eet 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
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan3850t ? rev. 3.0.0 4 fan3850t ? microphone pre-amp lifier with temperature compen sation and digital output electrical characteristics unless otherwise specified, all limits are guaranteed for t a =25c, v dd =1.8v, v in =94db (spl), 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 420 a i sleep sleep mode current f clk =gnd 1.4 8.0 a psr power supply rejection (7) input=ac coupled to gnd, test signal on v dd =217hz square wave and broad band noise (3) both 100mv p-p -80 dbfs in nom nominal sensitivity (4) input=94dbspl -26 dbfs snr signal-to-noise ratio f in =1khz 1pa, a-weighted 62.4 db(a) e n input referred noise (7) 20hz to 20khz, a-weighted 15.7db gain 5.3 8.6 v rms thd total harmonic distortion (5) f in =1khz, input=-26dbfs 0.01 0.10 % thd+n thd and noise (7) 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 tc temperature coefficient (7,11) gain measured at 50 ? c and -10 ? c -0.035 db/ ? c c in input capacitance (7,11) input 0.2 pf r in input resistance (7,11) 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 0.35v dd v v oh data output, logic high level 0.65v dd v v in15db maximum input signal for 15.7db of gain (5) f in =1 khz, thd+n < 10%; dc level=0v 503 mv pp v out acoustic overload point (11) thd < 10% 120 dbspl continued on the following page?
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan3850t ? rev. 3.0.0 5 fan3850t ? microphone pre-amp lifier with temperature compen sation and digital output electrical characteristics (continued) unless otherwise specified, all limits are guaranteed for t a =25c, v dd =1.8v, v in =94db (spl), 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 hi-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 hi-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 (7) 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 prob ability density function. bandwidth up to 10mhz. 4. assumes 120db(spl) is mapped to 0dbfs. 5. assumes an input -41, or -38dbv, depending on the part-specific gain. 6. verified by design simulation, showing idle tones and low noise level modulation to be typical 96db. 7. guaranteed by characterization. 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. 11. guaranteed by design. 12. temperature coefficient is calculated by measuring gain in db at 50 ? c and -10c and dividing by 60 (gain(50c) ? gain(-10c)/60). figure 3. interface timing
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan3850t ? rev. 3.0.0 6 fan3850t ? microphone pre-amp lifier with temperature compen sation and 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. thd, sinad, and snr vs. input amplitude figure 5. thd, sinad, and snr vs. output level \ 20.00 \ 10.00 0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00 0.001 0.010 0.100 1.000 10.000 100.000 1000.000 snr ? (dba), ? thd ? (db), ? sinad ? (db) input ? signal ? (mvpp) snr ? (dba) thd ? (db) sinad ? (db) \ 100.0 \ 90.0 \ 80.0 \ 70.0 \ 60.0 \ 50.0 \ 40.0 \ 30.0 \ 20.0 \ 10.0 0.0 \ 20.0 0.0 20.0 40.0 60.0 80.0 100.0 \ 95.77 \ 89.50 \ 83.76 \ 77.62 \ 71.59 \ 65.57 \ 61.57 \ 55.56 \ 49.57 \ 43.57 \ 37.57 \ 31.58 \ 25.55 \ 19.55 \ 17.56 \ 15.55 \ 13.55 \ 11.54 \ 9.54 \ 7.53 \ 5.54 \ 3.55 \ 1.63 0.00 snr(dba), ? thd ? (db), ? sinad ? (db), ? noise ? (dbfs) signal ? output ? level ? (dbfs) snr ? (dba) thd ? (db) sinad ? (db) noise ? (dbfs)
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan3850t ? rev. 3.0.0 7 fan3850t ? microphone pre-amp lifier with temperature compen sation and digital output figure 6. gain vs. temperature (~.035db/ ? c)(1) note: 13. alternate temperature coefficient slopes are po ssible. please contact a fairchild representative. 14.8 15.0 15.2 15.4 15.6 15.8 16.0 16.2 16.4 16.6 16.8 0 10 20 30 40 50 averag ? gain ? (db) temperature ? ? c ?
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan3850t ? rev. 3.0.0 8 fan3850t ? microphone pre-amp lifier with temperature compen sation and digital output applications information figure 7. mono microphone application circuit figure 8. stereo microphone application circuit l/r decimation vdd interpolation select speaker applications software adc select clk pre- amp sdi adc input sdo pre- amp data input clock vdd 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 vdd select sdo audio output l/r
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan3850t ? rev. 3.0.0 9 fan3850t ? microphone pre-amp lifier with temperature compen sation and digital output figure 9. mic element drawing applications information a 0.1f decoupling capacitor is required for v dd . it can be located either inside the microphone or on the pcb very close to the vdd pin. due to high input impedance, careful consideration should be taken to remove all flux used during the reflow soldering process. a 100 ? resistance is recommended on the clock output of the device driving the fan3850t to minimize ringing and improve signal integrity. for optimal psr, route a trace to the vdd pin. do not place a v dd plane under the device.
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan3850t ? rev. 3.0.0 10 fan3850t ? microphone pre-amp lifier with temperature compen sation and digital output physical dimensions figure 10. 6-ball, wafer-level chip-scale package (wlcsp) table 1. product-specific dimensions d e x y 1.260mm 0.860mm 0.145mm 0.145mm ball composition: sn97.5-ag2.5 package drawings are provided as a service to customers consi dering fairchild components. drawings may change in any manner without notice. please note the revision and/or date on the drawi ng and contact a fairchild semiconductor representative to ver ify or obtain the most recent revision. package specifications do not expand the terms of fairchild?s worldwide terms and conditions, specifically the warranty therein, which covers fairchild products. always visit fairchild semiconductor?s online packagi ng area for the most recent package drawings: http://www.fairchildsemi.com/packaging/ . bottom view top view 1 2 a b c 6x 0.005 cab (x) +/-0.018 (y) +/-0.018 ?0.1200.010 f e d b a pin a1 area 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 a1 0.01 c
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fan3850t ? rev. 3.0.0 11 fan3850t ? microphone pre-amp lifier with temperature compen sation and digital output

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