ak5700 AKM Semiconductor, Inc., ak5700 Datasheet - Page 38

• Manufacturer Part Number: ak5700
• Description: 16-bit ?? Mono Adc With Pll & Mic-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
When writing to the IVL7-0 bits continuouslly, the control register should be written by an interval more than zero
crossing timeout. If not, IVL is not changed since zero crossing counter is reset at every write operation. If the same
register value as the previous write operation is written to IVL, this write operation is ignored and zero crossing counter is
not reset. Therefore, IVL can be written by an interval less than zero crossing timeout.
(1) The wait time from ALC bit = “1” to ALC operation start by IVL7-0 bits is at most recovery time (WTM1-0 bits) plus
(2) Writing to IVL register (18H) is ignored during ALC operation. After ALC is disabled, the IVOL changes to the last
Upon power-up, the AK5700 should be reset by bringing the PDN pin = “L”. This ensures that all internal registers reset
to their initial values.
The ADC enters an initialization cycle that starts when the PMADC bit is changed from “0” to “1”. The initialization
cycle time is 3088/fs=70.0ms@fs=44.1kHz when HPF1-0 bits are “00” (see Table 30). During the initialization cycle, the
ADC digital data outputs of both channels are forced to a 2’s complement, “0”. The ADC output reflects the analog input
signal after the initialization cycle is complete.
MS0569-E-01
HPF1 bit
System Reset
zerocross timeout period (ZTM1-0 bits).
written data by zero crossing or timeout. When ALC is enabled again, ALC bit should be set to “1” by an interval
more than zero crossing timeout period after ALC bit = “0”.
0
0
1
1
ALC bit
ALC Status
IVL7-0 bits
Internal IVL
HPF0 bit
0
1
0
1
E1H(+30dB)
3088/fs
1552/fs
Figure 36. IVOL value during ALC operation
Disable
784/fs
Cycle
N/A
Table 30. ADC Initialization Cycle
(1)
(Recommendation)
fs=44.1kHz
E1(+30dB) --> F1(+36dB)
70.0ms
35.2ms
17.8ms
- 38 -
N/A
E1H(+30dB)
Enable
Init Cycle
(Recommendation)
fs=22.05kHz
140.0ms
70.4ms
35.6ms
N/A
(2)
E1(+30dB)
Disable
(Recommendation)
fs=11.025kHz
280.1ms
140.8ms
71.1ms
N/A
[AK5700]
Default
2006/12