Stereo Audio Digital-to-Analog Converter Module

Rajkumar Sharma
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medium
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SKU: EL154188
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This is a breakout board for the IC PCM1795 stereo digital-to-analog converter (DAC), The DAC module accepts pulse code modulation (PCM) and direct stream digital (DSD) audio data formats, thus providing an easy interface to audio digital signal processors (DSPs) and decoder chips which will convert digital signal into analog signal. Sampling rates up to 200 kHz are supported. A full set of user-programmable functions is accessible through an SPI or I2C serial control port that supports register write and readback functions. The PCM1795 device supports the time-division-multiplexed (TDM) command and audio (TDMCA) data format.

Features

Dual Supply Operations 5V for Analog and 3.3V for Digital
32-Bit Resolution
Analog Performance:
- Dynamic Range: 123 dB
- THD+N: 0.0005%
Differential Current Output: 3.9 mAPP
8× Oversampling Digital Filter:
- Stop-Band Attenuation: –98 dB
- Passband Ripple: ±0.0002 dB
Sampling Frequency: 10 kHz to 200 kHz
System Clock: 128, 192, 256, 384, 512, or 768 fS With Autodetect
Accepts 16-, 24-, and 32-Bit Audio Data
PCM Data Formats: Standard, I2S, and Left- Justified
DSD Format Interface Available
Interface Available for Optional External Digital Filter or DSP
TDMCA or Serial Port (SPI™/I2C)
User-Programmable Mode Controls:
Digital Attenuation:
- 0 dB to –120 dB, 0.5-dB/Step
- Digital De-Emphasis
- Digital Filter Roll-Off: Sharp or Slow
- Soft Mute
- Zero Flag for Each Output
Dual Supply Operation:
- 5-V Analog, 3.3-V Digital
- 5-V Tolerant Digital Inputs
- PCB Dimensions 36.04 x 33.97 mm

Connections

CN1: Pin 1,2 = VD-5V , Pin 3,4=GND
CN2: Audio/I Output Pin 1 = Left -Out, Pin 2 = Left +Out, Pin 3 = Right -Out, Pin 4 = Right +out. Pin 5 = GND
CN3: Pin 1 = 3.3V , Pin 2 = GND, Pin 3 = SCL, Pin 4 = BCK, Pin 5 = Data, Pin 6 = LRCK
CN4: Pin 1 = ZEROL, Pin 2 ZEROR, Pin 3 = GND, Pin 4 = MS, Pin 5 = MDI, Pin 6 = MC, Pin 7 = MDO, Pin 8 = RESET
D1: 3.3V Power LED
D2: 5V Power LED

Schematic

Parts List

NO	QNTY	REF	DESC.	MANUFACTURER	SUPPLIER	SUPPLIER PART NO
1	1	CN1	4 PIN MALE HEADER PITCH 2.54MM	WURTH	DIGIKEY	732-5317-ND
2	1	CN2	5 PIN MALE HEADER PITCH 2.54MM	WURTH	DIGIKEY	732-5318-ND
3	1	CN3	6 PIN MALE HEADER PITCH 2.54MM	WURTH	DIGIKEY	732-5319-ND
4	1	CN4	8 PIN MALE HEADER PITCH 2.54MM	WURTH	DIGIKEY	732-5321-ND
5	5	C1,C5,C6,C8,C10	100nF/50V CERAMIC SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
6	1	C2	47uF/35V ELEKTROLYTIC	WURTH	DIGIKEY	732-8508-1-ND
7	4	C3,C4,C7,C9	10uF/25V CERAMIC SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
8	2	D1,D2	LED SMD SIZE 0805	OSRAM	DIGIKEY	475-1278-1-ND
9	1	L1	FERRITE BEAD LI0805G301R-10	LAIRD	DIGIKEY	240-2382-1-ND
10	2	R1,R3	1K 5% SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
11	3	R2,R4,R5	27E 5% SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
12	1	R6	10E 5% SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
13	1	R7	10K 5% SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
14	1	U1	PCM1795 SSOP28	TI	DIGIKEY	296-24518-1-ND