ak4562 AKM Semiconductor, Inc., ak4562 Datasheet - Page 22

• Manufacturer Part Number: ak4562
• Description: Low Power 20bit Codec With Pga
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
n Detail of functions
(1) Input Analog PGA with Zero Crossing Detection
(2) Monaural Mixing
(3) De-emphasis
MS0031-E-00
Include digital de-emphasis filter circuit with tc=50/15us.
Zero crossing is detected on L/R channels independently. If zero crossing is not detected, IPGA value changes by
timeout. Timeout cycle can be set by ZTM1-0 bit. For example, when ZTM1-0 is “11”, timeout cycle is 2048/fs =
46.4ms (@fs=44.kHz). Zero crossing detection function can be controlled by ON/OFF of ZEIP bit. If ZEIP is OFF,
gain level changes immediately by writing IPGA value.
Offset calibration starts by PDN pin “L” to “H”. IPGA is set MUTE during offset calibration and after offset
calibration.
Stereo Recording
Monaural Recording
Stereo Input
Monaural Recording
Lch Input only
Monaural Recording
Rch Input only
Lch
Rch
Mode
ADC
HPF
ADC
HPF
Table 5. Monaural Mode Setting
+
(L+R)/2
Figure 16. Monaural Mixing
SW1
Rch
Lch
Lch
x 0.5
- 22 -
(L+R)/2
SW2
Rch
Rch
Lch
MONO1
SW1
SW2
0
0
1
1
Rch
Lch
MONO0
0
1
0
1
[AK4562]
2000/05