Marantz CDR631 Service Manual page 22

7.2.2 Analog-out path
Description
The I2S-bus data format being the digital output signal, goes
from the DASP on the CDR main board via flex and connector
J601 to the I/O board. Here it is presented to the D/A converter
AK4393. The DAC's analog outputs pass an amplification and filtering
circuit (opamp Q603, Q604). After the analog-out L and R signals are
sent to the headphone connector on the headphone board, analog out
UNBALANCE connectors on the AUDIO board. The DAC uses the
CL11-clock (11.2896 MHz), coming from the DASP on the CDR main
board.
LRCK
BICK
SDATA
PDN
SMUTE
DFS
DIF0 DIF1 DIF2
DVDD
Audio Data
Interface
De-emphasis
Interpolator
Soft Mute
De-emphasis
Interpolator
Soft Mute
Control Register
CCLK CDTI P/S
CSN
20
DAC AK4393
Description
The AK4393 is a high performance, single-chip stereo, audio
DAC delivering 101dB dynamic range sample rate.
Block diagram
DVSS DEM0 DEM1
De-emphasis
Control
∆Σ
8x
Modulator
∆Σ
8x
Modulator
Clock Divider
MCLK CKS0 CKS1 CKS2 VREFH VREFL
Figure 7-15
AVDD AVSS
BVSS
VCOM
AOUTL+
SCF
AOUTL-
AOUTR+
SCF
AOUTR-