More detail on new 2 channel stereo DAC for OPPO 103

OPPO 93 can be used with this DAC in electrically, but physical dimension of board is different.

DIP switch setting

1: (serial data mode)

ON : I2S / OFF : OPPO signal

2: (serial data bit size)

ON : 24bit / OFF : 32bit

3: : digital filter roll off

ON : slow / OFF : fast

4-5 : Digital filter IIR cut off frequency

 4      5

OFF OFF : 50KHz (default)

ON OFF : 60KHz

OFF ON : 70KHz

ON ON : Reserved

   

power supply configuration

 

 

For Op amp

+ 12V: LT1963 ( heatsink) + 4700uf/25V

-12V : LT3015 + 2200uf/25V

 

for DAC digital section

schottky Barrier diode

  + 5V : 7805 ( DAC ) ( heatsink ) + 4700uf/10V

3.3 V TCXO precision voltage regulator 3.3 V : ADP150AUJZ

 

 

---- ESS9018 pins ---

1 &16: analog VDD L→ A

7 & 10 & 17 & 64 : AVCC left 3.3 V ( D)

25: DVCC-B → B

20 & 29: VDD core → C

32 & 39 & 42 & 49: AVCC right 3.3 V (E)

33 & 48 : analog VDD_R → F

61 : digital core chip power → C

62 : DVCC_T → B

 

 

A: analog left power 1.2 V

B: 3.3 V

C: digital core power 1.2 V

D: AVCC left 3.3 V

E: AVCC right 3.3 V

F: analog right power 1.2 V  

 

for these, ADP151AUJZ-3.3, ADP151AUJZ-1.2, AP1122E  and LT1963EST-3.3

ICs are used

total 10 of local precision linear power ICs