general description the MAX9812/max9813 are single/dual-input, 20db fixed-gain microphone amplifiers. they offer tiny pack- aging and a low-noise, integrated microphone bias, making them ideal for portable audio applications such as notebook computers, cell phones, and pdas. these amplifiers feature a 500khz bandwidth, rail-to-rail out- puts, an industry-leading 100db power-supply rejection ratio, and a very low 0.015% thd+n. power-saving fea- tures include very low 230? supply current and a total shutdown mode that cuts the combined supply and bias currents to only 100na. the MAX9812 is a single amplifier in a 6-pin sc70 package (2mm x 2.1mm) and the max9813 is a dual- input amplifier available in an 8-pin sot23 (3mm x 3mm) package. the max9813 has two inputs allowing two microphones to be multiplexed to a single output. the MAX9812/max9813 are offered in two grades. the MAX9812l/max9813l are optimized for 3.3v supply operation (2.7v to 3.6v). the MAX9812h/max9813h are pc2001 compliant and are optimized for 5v operation (4.5v to 5.5v). both devices are specified over the -40? to +85? extended operating temperature range. applications notebook computers pdas smart phones car kit adapters digital cameras video tape recorders features pc2001 compliant 100db at 217hz power-supply rejection ratio very low 230? quiescent current low 0.015% thd+n available in two versions MAX9812l/max9813l?.7v to 3.6v MAX9812h/max9813h?.5v to 5.5v internal low-noise microphone bias supply 2.3v for MAX9812l/max9813l 4.0v for MAX9812h/max9813h 100na low-power shutdown mode rail-to-rail outputs 20db fixed gain available in tiny 6-pin sc70 (2mm x 2.1mm) and 8-pin sot23 (3mm x 3mm) packages extended temperature range -40? to +85? 19-2840; rev 2; 9/12 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maximintegrated.com. MAX9812/max9813 tiny, low-cost, single/dual-input, fixed-gain microphone amplifiers with integrated bias ordering information pin configurations, selector guide, and typical operating circuits appear at end of data sheet. part temp range pin- pa ck a g ev cc (v) MAX9812 lext+t -40 c to +85 c 6 sc70 2.7 to 3.6 MAX9812lext/v+t -40 c to +85 c 6 sc70 2.7 to 3.6 MAX9812hext+t -40 c to +85 c 6 sc70 4.5 to 5.5 max9813 leka+t -40 c to +85 c 8 sot23 2.7 to 3.6 max9813heka+t -40 c to +85 c 8 sot23 4.5 to 5.5 MAX9812 20db reference 2.3v (l version) 4.0v (h version) in bias out shdn v cc gnd max9813 20db in1/in2 reference 2.3v (l version) 4.0v (h version) in2 in1 bias out shdn v cc gnd simplified block diagrams + denotes a lead(pb)-free/rohs-compliant package. /v denotes an automotive qualified part.
2 maxim integrated MAX9812/max9813 tiny, low-cost, single/dual-input, fixed-gain microphone amplifiers with integrated bias absolute maximum ratings electrical characteristics (v cc = 3.3v, i bias = 500? (MAX9812l/max9813l), v cc = 5v, i bias = 800? (MAX9812h/max9813h), v gnd = 0v, r l = open, shdn = v cc , t a = t min to t max , unless otherwise noted. typical values are at t a = +25 c.) (note 1) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. (all voltages referenced to gnd.) v cc ........................................................................-0.3v to +6.0v all other pins..............................................-0.3v to (v cc + 0.3v) continuous current (in, shdn , in1, in2, in1/ in2 )........... 20ma out, bias short-circuit duration (to gnd or v cc ) ...continuous continuous power dissipation (t a = +70 c) sc70 (derate 3.1mw/ c above +70 c) .......................245mw sot23 (derate 8.9mw/ c above +70 c) .....................714mw operating temperature range ...........................-40 c to +85 c storage temperature range .............................-65 c to +150 c junction temperature ......................................................+150 c lead temperature (soldering, 10s) .................................+300 c soldering temperature (reflow) .......................................+260 c parameter symbol conditions min typ max units general MAX9812l/max9813l 2.7 3.6 supply voltage range v cc MAX9812h/max9813h inferred from psrr test 4.5 5.5 v supply current i cc i bias = 0a 230 400 ? shutdown supply current i cc_shdn shdn = gnd 0.1 1 a MAX9812l/max9813l 1.35 1.5 1.65 amplifier output bias voltage v out_dc MAX9812h/max9813h 2.25 2.5 2.75 v input resistance r in 85 k ? voltage gain a v 19 20 21 db dc 90 100 f = 217hz 100 f = 1khz 100 power-supply rejection ratio psrr out input referred, t a = +25? f = 10khz 90 db r l = 10k ? to v cc /2 v cc - 0.1 v oh r l = 1k ? to v cc /2 v cc - 0.25v v cc - 0.1v r l = 10k ? to v cc /2 0.1 output voltage swing v ol r l = 1k ? to v cc /2 0.1 0.25 v output short-circuit current i out_sc sinking or sourcing 3 12 24 ma small-signal -3db bandwidth bw v out = 10mv p-p 400 khz output capacitive-load stability c l no sustained oscillations 50 pf output impedance z out f = 1khz 0.5 ? output slew rate sr v out = 1v step 1 v/?
3 maxim integrated MAX9812/max9813 tiny, low-cost, single/dual-input, fixed-gain microphone amplifiers with integrated bias electrical characteristics (continued) (v cc = 3.3v, i bias = 500? (MAX9812l/max9813l), v cc = 5v, i bias = 800? (MAX9812h/max9813h), v gnd = 0v, r l = open, shdn = v cc , t a = t min to t max , unless otherwise noted. typical values are at t a = +25 c.) (note 1) note 1: all specifications are 100% tested at t a = +25?. temperature limits are guaranteed by design. parameter symbol conditions min typ max units amplifier input voltage-noise density e n inputs at ac gnd f = 1khz 40 nv/ hz total integrated input noise v n 22hz to 22khz bw, inputs at ac gnd 5 v rms 1khz 75 off-isolation input referred, max9813 only 10khz 60 db v out = 1v p-p (l version) 0.04 total harmonic distortion plus noise thd+n f = 1khz, r l = 10k ? to v cc /2, bw = 22hz to 22khz v out = 4v p-p (h version) 0.015 % bias MAX9812l/max9813l 2.1 2.30 2.55 bias output voltage range v bias MAX9812h/max9813h 3.6 4.0 4.4 v bias output resistance r bias 0.1 ? dc, t a = +25? 70 80 f = 217hz 80 f = 1khz 75 power-supply rejection ratio (v cc to bias) psrr bias f = 10khz 55 db bias current limit i bias_sc bias short to gnd 5 22 50 ma bias capacitive-load stability c bias no sustained oscillations 50 pf total integrated bias noise v n 22hz to 22khz bw 29 ? rms digital inputs ( shdn , in1/ in2 ) logic-low threshold v il 0.8 v logic-high threshold v ih 2.0 v logic input current i in shdn = gnd or v cc 1 a shutdown enable time t shdn_on 95% of settled value 10 ms shutdown disable time t shdn_off 50 ? in1/ in2 select time t sel 10 ?
typical operating characteristics (v cc = 3.3v (MAX9812l/max9813l), v cc = 5v (MAX9812h/max9813h), v gnd = 0v, r l = 10k ? to v cc /2, shdn = v cc , t a = +25 c, unless otherwise noted.) -20 0 -10 20 10 30 40 10 1k 10k 100 100k 1m 10m gain vs. frequency MAX9812 toc01 frequency (hz) output voltage gain (db) r l = open v out = 10mv p-p power-supply rejection ratio vs. frequency MAX9812 toc02 frequency (hz) psrr (db) 10k 1k 100 10 100k -150 -80 -90 -100 -110 -120 -130 -140 -60 -70 -40 -50 -30 -10 -20 0 v ripple = 200mv p-p input referred power-supply rejection ratio (v cc to bias) vs. frequency MAX9812 toc03 frequency (hz) psrr (v cc to bias) (db) 10k 1k 100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -100 10 100k v ripple = 200mv p-p 200 210 205 220 215 230 225 235 245 240 250 -40 -10 5 20 -25 35 50 65 80 supply current vs. temperature MAX9812 toc04 temperature ( c) supply current ( a) MAX9812h MAX9812l 100 140 120 180 160 220 200 240 280 260 300 2.0 2.8 3.2 3.6 2.4 4.0 4.4 4.8 5.6 5.2 6.0 supply current vs. supply voltage MAX9812 toc05 supply voltage (v) supply current ( a) MAX9812l MAX9812h 0.05 0.07 0.06 0.09 0.08 0.11 0.10 0.12 0.14 0.13 0.15 -40 -10 5 20 -25 35 50 65 80 shutdown supply current vs. temperature MAX9812 toc06 temperature ( c) shutdown supply current ( a) 2.27 2.28 2.29 2.30 2.31 2.32 2.33 -40 -10 -25 5 20 35 50 65 80 v bias vs. temperature MAX9812 toc07 temperature ( c) v bias (l version) (v) 3.97 3.98 3.99 4.00 4.01 4.02 4.03 3.96 v bias (h version) (v) MAX9812h MAX9812l 2.2997 2.2998 2.2999 2.3000 2.3001 2.3002 0 0.8 1.0 0.4 0.6 0.2 1.2 1.4 1.6 1.8 2.0 v bias vs. i bias MAX9812 toc08 i bias (ma) v bias (l version) (v) MAX9812h MAX9812l 3.9998 3.9999 4.0000 4.0001 4.0002 v bias (h version) (v) 4 maxim integrated MAX9812/max9813 tiny, low-cost, single/dual-input, fixed-gain microphone amplifiers with integrated bias
typical operating characteristics (continued) (v cc = 3.3v (MAX9812l/max9813l), v cc = 5v (MAX9812h/max9813h), v gnd = 0v, r l = 10k ? to v cc /2, shdn = v cc , t a = +25 c, unless otherwise noted.) total harmonic distortion plus noise vs. output amplitude MAX9812 toc10 output amplitude (v rms ) thd+n (%) 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.01 0.1 1 10 0.001 02.0 h version bw = 22hz to 22khz f = 10khz f = 1khz f = 100hz total harmonic distortion plus noise vs. output amplitude MAX9812 toc11 output amplitude (v rms ) thd+n (%) 1.0 0.5 0.01 0.1 1 100 10 0.001 0 1.5 f = 10khz f = 100hz f = 1khz l version bw = 22hz to 22khz 100 50 30 70 10 10 10k 100k frequency (hz) input-referred noise (nv/ hz ) 100 input-referred noise vs. frequency inputs at ac gnd 1k MAX9812 toc12 bias noise vs. frequency MAX9812 toc13 frequency (hz) bias noise (nv/ hz ) 10k 1k 100 100 1000 10,000 10 10 100k off-isolation vs. frequency MAX9812 toc14 frequency (hz) crosstalk (db) 10k 1k 100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 -100 10 100k max9813 v in1 = 100mv rms in1 to out with in2 selected 5 maxim integrated MAX9812/max9813 tiny, low-cost, single/dual-input, fixed-gain microphone amplifiers with integrated bias total harmonic distortion plus noise vs. frequency MAX9812 toc09 frequency (hz) thd+n (%) 10k 1k 100 0.01 0.1 1 0.001 10 100k v out = 1v rms r l = 2k ? bw = 22hz to 22khz v out = 1v rms r l = 10k ?
6 maxim integrated MAX9812/max9813 tiny, low-cost, single/dual-input, fixed-gain microphone amplifiers with integrated bias 2 s/div output overdriven out 1v/div MAX9812 toc19 in 500mv/div typical operating characteristics (continued) (v cc = 3.3v (MAX9812l/max9813l), v cc = 5v (MAX9812h/max9813h), v gnd = 0v, r l = 10k ? to v cc /2, shdn = v cc , t a = +25 c, unless otherwise noted.) 1ms/div out-of-shutdown waveform input unconnected MAX9812 toc17 out 2v/div bias 2v/div shdn 2v/div 100 s/div max9813 switching between two inputs 1v/div MAX9812 toc18 2v/div out in1/in2 in2 = 200mv p-p at 20khz in1 = 100mv p-p at 10khz 1 s/div small-signal pulse response (r l = open, c l = 10pf) in 5mv/div MAX9812 toc15 out 50mv/div 2 s/div large-signal pulse response (r l = open, c l = 10pf) in 100mv/div MAX9812 toc16 out 1v/div 0v
7 maxim integrated MAX9812/max9813 tiny, low-cost, single/dual-input, fixed-gain microphone amplifiers with integrated bias pin description detailed description the MAX9812_/max9813_ are low-power fixed-gain microphone amplifiers available in a single- or dual- input configuration. the gain is set at 10v/v (20db) with a 400khz, -3db bandwidth. they also feature a low- noise, integrated microphone input bias voltage. single/dual input the MAX9812l/MAX9812h are single-input amplifiers and the max9813l/max9813h are dual-input ampli- fiers. all devices typically have an input impedance of 85k ? . the inputs to the dual version are controlled through a fast 2:1 mux, selectable through the in1/ in2 pin. driving in1/ in2 high selects in1 and driving the in1/ in2 low selects in2. in1/ in2 is designed to be dri- ven by a logic high of 2v and a logic low 0.8v. the in1/ in2 has a 10? switching time from one channel to the other. pc2001 low-noise microphone bias the MAX9812_/max9813_ provide a low-noise voltage bias designed for biasing electret condenser micro- phone (ecm) cartridges. the bias output is regulated to typically 2.3v for the MAX9812l/max9813l and 4v for the MAX9812h/max9813h. in the single-input ver- sion (MAX9812_), the bias output can source up to 1ma. in the dual-input version (max9813_), the bias output can source up to 2ma. the MAX9812h/ max9813h provides a pc2001-compliant bias voltage. output stage the MAX9812_/max9813_ rail-to-rail output (out) typical- ly swings to within 100mv of the rails when driving 10k ? . the output dc bias point is set to 1.5v for the MAX9812l/ max9813l and 2.5v for the MAX9812h/max9813h. shutdown mode shdn controls whether the MAX9812_/max9813_ is active or in shutdown mode. driving shdn low forces a low-power (100na) shutdown mode. in this mode, the out pin is set to a high-impedance state and the bias pin is pulled down (70k ? ). driving shdn high enables the MAX9812_/max9813_. shdn is a high-impedance input and cannot be left unconnected. driving capacitive loads the MAX9812_/max9813_ output can drive up to 50pf of capacitance without sustained oscillations. thermal shutdown the thermal shutdown feature protects the MAX9812_/max9813_ from destruction due to overheat- ing caused by shorting the outputs. this protection fea- ture causes out and bias to shut down and go high impedance when the die temperature reaches +140 c. the device restarts after the die temperature falls below +120 c. applications information power-up the MAX9812_/max9813_ output typically settles to 95% within 10ms after power-up. typical application circuit figure 1 shows the max9813h used as a preamplifier with the max9760 3w audio power amplifier. pin MAX9812l/ MAX9812h max9813l/ max9813h name function 13 shdn active-low shutdown input. connect shdn to v cc for normal operation. connect shdn to gnd for shutdown. shdn is a high-impedance input; do not leave unconnected. 2 2 gnd ground 3 1 out amplifier output 48v cc positive supply. bypass v cc to gnd with a 0.1? capacitor. 5 7 bias low-noise microphone bias output. 2.3v output for MAX9812l/max9813l. 4v output for MAX9812h/max9813h. 6 in amplifier input (MAX9812) 6 in1 amplifer input 1 (max9813) 5 in2 amplifier input 2 (max9813) 4 in1/ in2 input selector. when in1/ in2 is high, in1 is selected. when in1/ in2 low, in2 is selected.
8 maxim integrated MAX9812/max9813 tiny, low-cost, single/dual-input, fixed-gain microphone amplifiers with integrated bias figure 1. typical application circuit hpf hpf microcontroller codec max9813 in1 in2 bias out max9760 inr2 inr1 inl2 inl1 sv dd bias 1 f 0.1 f 0.68 f 0.68 f 0.68 f 0.68 f 0.047 f 0.047 f 220 f 220 f 27.4k ? 27.4k ? 47k ? 10k ? 10k ? 680k ? 33.2k ? 33.2k ? 15k ? 15k ? 15k ? 15k ? 15k ? 10k ? 1k ? 1k ? 15k ? scl sda add int shdn gainlb gainla outl+ outl- outr+ gainra gainrb outr- hps v dd v dd v dd pv dd v dd v cc v dd gnd in1/in2 2.2k ? 0.1 f 0.1 f shdn 0.1 f 0.1 f 22k ? 2.2k ? 220k ?
9 maxim integrated MAX9812/max9813 tiny, low-cost, single/dual-input, fixed-gain microphone amplifiers with integrated bias MAX9812 bias in shdn v cc gnd 2.2k ? 0.1 f mic out v cc 0.1 f 0.1 f 5 6 2 4 3 1 v bias max9813 bias in1/in2 in1 in2 shdn v cc gnd 2.2k ? 2.2k ? 0.1 f 0.1 f mic1 mic2 out v cc 0.1 f 0.1 f 7 6 5 4 2 8 1 3 v bias chip information process: bicmos typical operating circuits selector guide part pin-package v cc (v) top mark MAX9812lext+t 6 sc70 2.7 to 3.6 abj MAX9812hext+t 6 sc70 4.5 to 5.5 abk max9813leka+t 8 sot23 2.7 to 3.6 aeeu max9813heka+t 8 sot23 4.5 to 5.5 aeev sc70 top view gnd v cc out 1 + 6in 5 bias shdn MAX9812 2 34 + sot23 in1 in2 in1/in2 1 2 8 7 v cc bias gnd shdn out 3 4 6 5 max9813 pin configurations + denotes a lead(pb)-free/rohs-compliant package. package information for the latest package outline information and land patterns (foot- prints), go to www.maximintegrated.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. package type package code outline no. land pattern no. 6 sc70 x6sn+1 21-0077 90-0189 8 sot k8+1 21-0078 90-0176
MAX9812/max9813 tiny, low-cost, single/dual-input, fixed-gain microphone amplifiers with integrated bias maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidanc e. 10 ________________________________ maxim integrated 160 rio robles, san jose, ca 95134 usa 1-408-601-1000 2012 maxim integrated products, inc. the maxim logo and maxim integrated are trademarks of maxim integrated products, inc. revision history revision number revision date description pages changed 0 4/03 initial release 1 8/12 added lead-free description 1, 9 2 9/12 added automotive qualified part 1
|
