AK4564 Datasheet, PDF (19/48 Pages) Asahi Kasei Microsystems – 16BIT CODEC WITH BUILT-IN ALC AND MIC/HP/SPK-AMP

ASAHI KASEI
[AK4564]
5. Polarity
Input signals from INTL/INTR, EXTL/EXTR and BEEP1 pins are inverted and are output from ADC. Input signals
from LIN1/RIN1 and LIN2/RIN2 pins are non-inverted and output from ADC.
Signal Path
INTL/INTR à ADC
EXTL/EXTR à ADC
BEEP1 à ADC
LIN1/RIN1 à ADC
LIN2/RIN2 à ADC
Polarity
Inverted
Inverted
Inverted
Non-inverted
Non-inverted
Table 2. Polarity of Recording Block
6. MONO Mode
When MONO bit is “1”, the recording blocks in the AK4564 becomes MONO mode. The Pre-Amp, MIX1-Amp,
MIX2-Amp and ADC analog block of the right channel are powered-down. And the right channel data of ADC is the
same as the left channel data of ADC. When changing MONO mode, the ADC should be powered-up by changing
ADC bit = “1” after MONO bit is changed to “1”. Because click noise may occur when MONO bit is changed during
ADC normal operation.
n BEEP2 Input
When BEEP2H bit is “1”, the input signal from BEEP2 pin is output to Headphone-Amp. When BEEP2S bit is “1”, the
input signal from BEEP2 pin is output to Speaker-Amp.
This signal level can be adjusted by an external resistor (Ri). An internal resistor value (Rf) is 20k ± 30% Ω. In
Speaker-Amp, the signal level is gained to +4.6dB internally.
BEEP2
Rf = 20kΩ
Ri
-
+
n MUTE Function
Figure 14. Block diagram of BEEP2 inputs
When MUTE pin is “H”, the output signals of LINEOUT, Headphone and Speaker-Amp are muted, and become VCOM
or HVCM voltage. The switches of AOUT1, AOUT2, HPDAC, HPMIX, BEEP2H, ALCS and BEEP2S become “OFF”
at the same time.
MS0140-E-01
- 19 -
2002/07