I'm looking at "upgrading" my (SA)CD-player with a new DAC chip. It now features a PCM1738. Not at all bad, but I guess, it would be fun to put another one in. So I looked and I guess PCM1792 could be the right candicate. I looked at the pinout, and it should not be to hard to make an adapter board
All in all doable I guess. Also, the internal registers are virtually the same. The only thing that bothers me is the current output. The 1738 has +/- 2.48 mA, but the 1792 has +/- 7.8 mA. What exactly would be the influence of this on the output circuitry? I guess the level would be a bit higher, but that can simply be fixed. What else should be taken care of?
- PCM1738 -> PCM1792
AGND1 18 -> 19
AGND2 27 -> 24
/CS 14 -> DGND
BCK 6 -> 6
DATA 5 -> 5
DGND 8 -> 8
IoutL+ 25 -> 25
IoutL- 26 -> 26
IoutR+ 17 -> 17
IoutR- 16 -> 18
Iref 21 -> 20
LRCK 4 -> 4
MC 13 -> 12
MDI 12 -> 11
MDO 11 -> 13
MUTE 15 -> DGND
/RST 1 -> 14
SCKI 7 -> 7
SCKO 10 -> -
Vcc1 23 -> 23
Vcc2 24 -> 28
Vcc3 28 -> 15
Vcom1 19 -> 22
Vcom2 20 -> 21
Vcom3 22 -> -
Vdd 9 -> 9
ZEROL 2 -> 1
ZEROR 3 -> 2
AGND3L 27
AGND3R 16
All in all doable I guess. Also, the internal registers are virtually the same. The only thing that bothers me is the current output. The 1738 has +/- 2.48 mA, but the 1792 has +/- 7.8 mA. What exactly would be the influence of this on the output circuitry? I guess the level would be a bit higher, but that can simply be fixed. What else should be taken care of?