ak4620b AKM Semiconductor, Inc., ak4620b Datasheet - Page 25

• Manufacturer Part Number: ak4620b
• Description: 24-bit 192khz Audio Codec With Ipga
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
The ADC has a selectable single-ended or differential input mode. This mode can be selected by ADMODE pin, AML bit
and AMR bit. (See Table 15 and Table 16) In differential input mode, the IPGA is powered-down and bypassed. IATT
can be controlled in differential mode.
Soft mute operation is performed in the digital domain of the DAC input. When the SMUTE bit goes to “1”, the output
signal is attenuated by −∞ during ATT_DATA × ATT transition time (Table 12) from the current ATT level. When
SMUTE bit is returned to “0”, the mute is cancelled and the output attenuation gradually changes to the ATT level during
ATT_DATA × ATT transition time. If soft mute is cancelled before attenuating to −∞ after starting the operation, the
attenuation is discontinued and returns to ATT level by the same cycle. The soft mute is effective for changing the signal
source without stopping the signal transmission.
Notes:
MS0401-E-00
ADC Single-ended/Differential Input Mode
Soft Mute Operation
(1) ATT_DATA × ATT transition time (Table 12). For example, this time is 1020LRCK cycles (1020/fs)
(2) Analog output corresponding to digital input has group delay (GD).
(3) If the soft mute is cancelled before attenuating −∞ after starting the operation, the attenuation is discontinued
(4) When the input data at each channel is continuously zero for 8192 LRCK cycles, DZF pin of each channel goes
at ATT_DATA=255 in Normal Speed Mode.
and returned to ATT level by the same cycle.
to “H”. DZF pin immediately goes to “L” if input data are not zero after going DZF pin “H”.
Attenuation
AO U T
D ZF pin
SM U T E bit
AT T _Level
ADMODE pin
H
L
-∞
Table 16. ADC Input Mode in serial mode (X: Don’t care)
ADMODE pin
AML bit
Table 15. ADC Input Mode in parallel mode
H
L
Figure 10. Soft Mute and Zero Detection
X
0
0
1
1
(1)
8192/fs
AMR bit
Single-ended
Differential
(4)
X
0
1
0
1
- 25 -
Lch
G D
(2)
Single-ended
Single-ended
Differential
Differential
Differential
Lch
Single-ended
Differential
(1)
Rch
G D
(2)
Single-ended
Single-ended
Differential
Differential
Differential
Rch
(3)
[AK4620B]
2005/07