PCM2706/7 based DAC design

[pcdude2143]

Here is a design I made for the PCM2706. It is based on info from

PCM2706 High Fidelity USB Soundcard / USB Headphones

I took away the buttons and stuff because they were driving me crazy. It also has less vias.

Be sure to put the polarized caps on the right way, because some are backwards on the silkscreen. Just follow the power traces from the chip. Also, put the audio jack and the crystal on the underside of the board, not the top. You may need to solder some wires around the board, because it's hard to reach underneath the USB port.

It's a mess, but it's my first project. 😀

 

[pcdude2143]

Bill of Materials

Line
No. Supplier Number
Customer Part No.
Description Qty
Ordered Qty
Shipped 1 <img title="RoHS: Compliant" alt="RoHS: Compliant">1
595-PCM2707PJTRG4
TI Audio D/A Converter ICs
Stereo DAC w/USB Ifc
US HTS: 8542.39.0000 ECCN:EAR99 COO:TW 2 2 2 <img title="RoHS: Compliant" alt="RoHS: Compliant">1
806-STX-3100-5N
Kycon Phone Connectors
3.5mm PCB STEREO BLK
US HTS: 8536.69.4040 ECCN:EAR99 COO:CN 2 2 3 <img title="RoHS: Compliant through Exemption" alt="RoHS: Compliant through Exemption">2
81-GQM1885C1H270GB01
Murata Multilayer Ceramic Capacitors (MLCC) - SMD/SMT
0603 27pF 50volts
US HTS: 8532.23.0020 ECCN:EAR99 COO:JP 5 5 4 <img title="RoHS: Compliant" alt="RoHS: Compliant">1
598-FCP1206C223G-H1
CDE SMD Film Capacitors
.022UF 16V 2%
US HTS: 8532.25.0045 ECCN:EAR99 COO:JP 5 5 5 <img title="RoHS: Compliant" alt="RoHS: Compliant">1
598-FCA1210C105M-G2
CDE SMD Film Capacitors
1.0UF 16V 20%
US HTS: 8532.25.0045 ECCN:EAR99 COO:JP 9 9 6 <img title="RoHS: Compliant" alt="RoHS: Compliant">1
653-B3SL-1022P
Omron Tactile & Jog Switches
6x6mm, 5.1mm Height
US HTS: 8536.50.9065 ECCN:EAR99 COO:JP 15 15 7

70-IR2.5610%
Vishay Common Mode Inductors
.56uH 10%
US HTS: 8504.50.8000 ECCN:EAR99 COO:MX 3 3 8 <img title="RoHS: Compliant" alt="RoHS: Compliant">1
757-TOTX177LF,T
Toshiba Fiber Optic Transmitters, Receivers, Transceivers
Toslink Transmitter
US HTS: 8541.40.6050 ECCN:EAR99 COO:TH 2 2 9 <img title="RoHS: Compliant" alt="RoHS: Compliant">1
647-PCS0J470MCL1GS
Nichicon Aluminum Organic Polymer Capacitors
6.3 volts 47uF
US HTS: 8532.21.0050 ECCN:EAR99 COO:JP 5 5 10 <img title="RoHS: Compliant" alt="RoHS: Compliant">1
647-PCS0J101MCL9GS
Nichicon Aluminum Organic Polymer Capacitors
6.3 volts 100uF
US HTS: 8532.21.0050 ECCN:EAR99 COO:JP 5 5 11 <img title="RoHS: Compliant" alt="RoHS: Compliant">1
66-PFC08LF15-B
IRC Thin Film Resistors - SMD
15 OHM .1% 25ppm
US HTS: 8533.21.0030 ECCN:EAR99 COO:US 5 5 12 <img title="RoHS: Compliant" alt="RoHS: Compliant">1
66-PFC12LF22.1-B
IRC Thin Film Resistors - SMD
22.1ohm .1% 25ppm
US HTS: 8533.21.0030 ECCN:EAR99 COO:US 5 5 13 <img title="RoHS: Compliant through Exemption" alt="RoHS: Compliant through Exemption">2
660-RN732BTTD1501F25
KOA Speer Thin Film Resistors - SMD
1/8W 1.5Kohm 1%
US HTS: 8533.21.0030 ECCN:EAR99 COO:JP 5 5 14 <img title="RoHS: Compliant" alt="RoHS: Compliant">1
754-RG1608P-332-BT5
Susumu Thin Film Resistors - SMD
1/10W 3.3Kohm 0.1%
US HTS: 8533.31.0000 ECCN:EAR99 COO:CN 9 9 15 <img title="RoHS: Compliant through Exemption" alt="RoHS: Compliant through Exemption">2
71-TNPW08051M00DEEA
Vishay Thin Film Resistors - SMD
1/8watt 1Mohms .5%
US HTS: 8533.21.0030 ECCN:EAR99 COO😀E 3 3 16 <img title="RoHS: Compliant" alt="RoHS: Compliant">1
815-ABL-12-20-D4HFI
ABRACON Crystals
12MHZ
US HTS: 8541.60.0050 ECCN:EAR99 COO:JP 3 3 17 <img title="RoHS: Compliant" alt="RoHS: Compliant">1
649-61729-1011BLF
FCI USB & Firewire Connectors
4P R/A RECEPTACLE
US HTS: 8536.69.4030 ECCN:EAR99 COO:CN 2 2

Keep in mind I bought enough parts to make two.

I selected the highest quality parts by spec, then selected the cheapest out of that bunch. It still sounds great.

Don't buy the SPDIF connectors. There's a resistor that wasn't in the parts list on the original site that's required to prevent it from blowing up. If you want that you'll need to redesign the board.