AK4691EG AKM [Asahi Kasei Microsystems], AK4691EG Datasheet - Page 32

• Manufacturer Part Number: AK4691EG
• Description: 4ch ADC + 2ch DAC with MIC/HP/SPK-AMP
• Manufacturer: AKM [Asahi Kasei Microsystems]

■
The AK4691 has MIC sensitivity (Interchannel gain mismatch) compensation function. The gain of each channel for
compensation is set by the resister as shown in
+32.4dB. It is ignored when Pre-Amp gain is 0dB or -4.4dB.
■
1. LINE Input
MS0672-E-00
Input resistance of LIN and RIN pins are typically 100kΩ and centered around the VCOM voltage. When the input
voltage exceeds +2dBV, the input signals should be attenuated down to –3.7dBV at AVDD=3.0V by external resistor
divider.
When AIN bit is “1”, LIN and RIN pins are selected. The MIX-Amp gain is changed by FB bit.
MIC Sensitivity Compensation
Analog Mixing Circuit for Recording Block
Analog
Signal
6.2kΩ
MGR12 bit
MGR22 bit
MGL12 bit
MGL22 bit
Table 18. MIC Sensitivity Compensation function (N/A: Not available)
0
0
0
0
1
1
1
1
(RIN pin)
6.2kΩ
LIN pin
Figure 23. Analog Mixing Circuit for Recording Block
Table 17. Relationship between register and input pin
MGR11 bit
MGR21 bit
MGL11 bit
MGL21 bit
From Pre-Amp1
Table 19. MIX-Amp gain at LINE Input
MGL12-10 bits
MGR12-10 bits
MGL22-20 bits
MGR22-20 bits
FB bit
0
0
1
1
0
0
1
1
Register
0
1
Table
typ. 60kΩ
17. This function is enabled when Pre-Amp gain is from +18dB to
typ.100kΩ
MGL10 bit
MGR10 bit
MGL20 bit
MGR20 bit
- 32 -
-4.4dB
Gain
0
1
0
1
0
1
0
1
0dB
PRE bit
AIN bit
INTR1/EXTR1
INTR2/EXTR2
INTL1/EXTL1
INTL2/EXTL2
typ.60kΩ /100kΩ
Input pin
(default)
-
+
MIXL-Amp
(MIXR-Amp)
+2dB
+1dB
Gain
-1dB
-2dB
N/A
0dB
(default)
To ADC1
[AK4691]
2007/11