data brief for further information contact your local stmicroelectronics sales office. october 2009 doc id 16593 rev 1 1/4 4 STEVAL-CCA018V1 single-supply stereo digital audio li ne driver based on the ts4657 features power supply range: 3 v to 5.5 v audio line output: 2.2 v rms for entire v cc range 16 to 24-bit audio data format stereo dac, 32 to 48 khz sample rate i 2 s, right or left justif ied compatible digital audio interface 95 db snr a-weighted at 48 khz, v cc = 5 v 7.4 ma current consumption at v cc = 3 v, full operation internal negative power supply to ensure ground-referenced, cap-less outputs no external capacitor needed for the negative power supply generation integrated structure to suppress pop and click noise standby mode active low rohs compliant description the STEVAL-CCA018V1 demonstration board is designed provide a platform for evaluating the performance of the ts4657 stereo digital-to analog-converter (dac). the ts4657 integrates a high-performance audio line driver capable of generating a 2.2 v rms output level from a single 3.0 to 5.5 v supply. a single supply is sufficient for the digital and analog parts of the circuit, eliminating the need for external regulators. the ts4657 is a low consumption device, with only 22 mw of power dissipation at 3.0 v power supply during full operation. a 16-bit multi-bit sigma-delta dac is used, operating at 256xfs with over sampling digital interpolation filters. the digital audio data can be 16 to 24-bits long and sample rates from 32 to 48 khz are supported. the output stage signal is ground-referenced by using an internal self-generated negative power supply, so bulky external output coupling capacitors are not necessary. STEVAL-CCA018V1 www.st.com
schematic diagram STEVAL-CCA018V1 2/4 doc id 16593 rev 1 1 schematic diagram figure 1. circuit schematic 1 2 3 jp1 1 2 3 jp2 1 2 3 jp3 v c cd v c ca j 4 j 3 j2 j1 c 3 1u f c4 1 uf r1 100k r2 100k r3 100k r4 100k c 1 10uf/6v3 digit a li n p u t u se rcon tr ol r5 820 r7 820 r6 nc r8 nc c6 2nf2 c7 2nf2 vccd vcca jp7 jp 5 3v to 5v5 g n d v c c f or mat2 f o rmat1 / s tdb y out l out r lr c lk s da t b clk m c lk nc 20 nc 2 mclk 6 bclk 5 lr c l k 3 s d a t 4 format1 8 format2 7 gndd 1 vccd 19 /stdby 9 gnda 10 voutr 11 vout l 1 2 vcca 13 vrega 14 gnda 15 gnda 16 gndd 17 vregd 18 d i gi ta l a u dio in te rface control interface d i gi ta l fi l te r s and d a cs epad ic1 ts4657 c5 1u f c2 1 uf vc c d jp6 jp4 output filters j 5 j6 s i p2 j7 sil2
STEVAL-CCA018V1 revision history doc id 16593 rev 1 3/4 2 revision history table 1. document revision history date revision changes 29-oct-2009 1 initial release.
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