ak4317 ETC-unknow, ak4317 Datasheet - Page 12

• Manufacturer Part Number: ak4317
• Description: 18bit Scf Dac With Att & Mixer
• Manufacturer: ETC-unknow

ASAHI KASEI
The AK4317 can control output attenuation level, output mode, de-emphasis type and attenuation mode
via the serial interface. The serial data consists of two 8 bits for setting the attenuation level of each
channel and 8 bits for the mode control.
Note 1: CCLK should be held "H" or "L" except writing to ATT & mode registers in order to avoid the
Note 2: If the above serial mode control is not used, CS should be held "H".
1. Attenuator Operation
The AK4317 has individually controllable attenuator with linear scale and 256 levels for each channel.
The transition between ATT values is same as soft mute operation. When current value is ATT1 and new
value is set as ATT2, ATT1 gradually becomes ATT2 with same operation as soft mute. If new value is set
as ATT3 before reaching ATT2, ATT value gradually becomes ATT3 from the way of transition.
When resetting, ATT value is set 00H(Infinity zero). ATT value gradually changes from 00H to FFH(0dB)
during Ts after exiting reset.
0172-E-01
Serial Mode Control
Equation of attenuation level: ATT=20×Log
Cycle time of soft mute: Ts=1024/fs
performance degradation.
FFH: 0dB
01H: -48.1dB
00H: Mute(Infinity zero:- )
:
L0-L7:
R0-R7:
S0-S3:
DEM:
ATC:
FS0,FS1: fs Control for de-emphasis Filter
Figure 6 . Configuration of attenuator and mixer
Figure 7 . Serial mode control timing
Lch ATT data, L0=LSB, L7=MSB
Rch ATT data, R0=LSB, R7=MSB
Output mode Control
De-Emphasis Control
ATT mode Control
10
(Binary level/255)
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:FFH at RESET
:00 at RESET
:FFH at RESET
:1001 at RESET
:0 at RESET
:0 at RESET
[AK4317]
1997/5