STEVAL-CCA018V1 STMicroelectronics

STEVAL-CCA018V1 Single-supply stereo digital audio line driver based on the TS4657 Data brief Features Power supply range: 3 V to 5.5 V Audio line output: 2.2 V for entire V RMS CC range 16 to 24-bit audio data format stereo DAC, 32 to 48 kHz sample rate 2 I S, right or left justified compatible digital audio interface 95 dB SNR A-weighted at 48 kHz, V = 5 V CC 7.4 mA current consumption at V = 3 V, full CC operation Internal negative power supply to ensure STEVAL-CCA018V1 ground-referenced, cap-less outputs No external capacitor needed for the negative The digital audio data can be 16 to 24-bits long power supply generation and sample rates from 32 to 48 kHz are Integrated structure to suppress pop and click supported. noise The output stage signal is ground-referenced by Standby mode active low using an internal self-generated negative power RoHS compliant supply, so bulky external output coupling capacitors are not necessary. 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 output level from a single RMS 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. October 2009 Doc ID 16593 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4 Schematic diagram STEVAL-CCA018V1 1 Schematic diagram Figure 1. Circuit schematic VCCD VCCA C2 C3 1uF 1uF 3vto5V5 VCCA VCCD 10uF/6V3 VCC C4 C5 C1 GND 1uF 1uF J5 IC1 C6 2nF2 JP4 J6 820 SIP2 R5 3 OUT L LRCLK JP5 LRCLK J4 Digital 12 VOUTL Digital 4 SDAT Filters SDAT J3 Audio and Digit lI p t 5 a n u BCLK JP7 BCLK J2 11 Interface DACs VOUTR 6 MCLK MCLK J1 OUT R R7 J7 820 SIL2 JP6 Control TS4657 C7 Interface 2nF2 OutputFilters Epad VCCD JP1 JP2 JP3 Format1 Format2 /Stdby UserControl 2/4 Doc ID 16593 Rev 1 100K R1 100K R2 100K R3 100K R4 1 2 3 8 FORMAT1 1 2 7 2 FORMAT2 nc 3 20 nc 9 /STDBY 1 2 3 19 VCCD 13 VCCA 1 GNDD 17 GNDD 10 GNDA 15 18 GNDA VREGD 16 GNDA 14 VREGA R8 R6 nc nc