data brief for further information contact your local stmicroelectronics sales office. august 2009 doc id 16138 rev 1 1/4 4 STEVAL-CCA023V1 demonstration board for low noise microphone preamplifier with 2 v bias based on the ts472 features low noise: 10 nv / hz typ. equivalent input noise @ f=1 khz fully differential input/output 2.2 v to 5.5 v single supply operation low power consumption @20 db: 1.8 ma fast start up time @ 0db: 5 ms typ. low distortion: 0.1% typ. 40 khz bandwidth @ -3 db and adjustable gain active low standby mode function (1a max) low noise 2.0 v microphone bias output available in flip-chip ecopack ? package and qfn24 4x4 mm esd protection (2 kv) rohs compliant description the STEVAL-CCA023V1 demonstration board is designed as an evaluation platform for the ts472 low noise microphone preamplifier with 2.0 v bias and active low standby mode. the board supports customization of the testing conditions, allowing the gain of the ts472 device to be adjusted, or an electret microphone to be biased either externally or using the ts472 built- in 2.0 v bias voltage. STEVAL-CCA023V1 www.st.com
schematic circuit STEVAL-CCA023V1 2/4 doc id 16138 rev 1 1 schematic circuit figure 1. demonstration board schematic diagram vcc 1 2 1uf c3 2 1 r5 68 2 1 r4 1k 2 1 r3 4.7k 2 1 r2 27k 2 1 r1 470k vcc 1 2 1uf c7 1 2 100nf c6 1 2 100pf c1 1 2 100pf c2 1 2 100nf c4 1 2 100nf c5 470k 27k 4k7 1k 68r bias min max rgs 2 1 r6 2 1 r7 1 2 3 4 p1 input 1 2 3 4 p2 output pos. input neg. input neg. output pos. output 1 2 100nf c8 1 2 100nf c9 jumper j2 2 1 r8 100k 2 1 r9 100k 1 2 1uf c10 1 2 p5 vcc 1 2 3 p6 standby jumper j1 1 2 p11 vbias 1 2 p10 vx 2 1 r10 1 2 c11 2 1 r11 jumper j4 bias bias bias 1 2 3 4 5 6 7 8 p8 gain select 1 2 3 4 5 6 7 8 9 10 p9 rgs jumper j3 bias stdby in- in+ gain c1 c2 out+ out- gain bypass bias gnd vcc select 14 3 1 13 12 5 10 15 9 4 8 6 ts472_adapter
STEVAL-CCA023V1 revision history doc id 16138 rev 1 3/4 2 revision history table 1. document revision history date revision changes 14-aug-2009 1 initial release.
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