AK4644 Datasheet, PDF (57/96 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP/RCV-AMP

ASAHI KASEI
[AK4644]
„ Mono Reveiver Output (RCP/RCN pins)
When RCV bit = “1”, LOUT/ROUT pins become RCP/RCN pins, respectively. Lch/Rch signal of DAC or
LIN2/RIN2/LIN3/RIN3 is output from the RCP/RCN pins which is BTL as (L+R)/2 signal. The load impedance is 32Ω
(min). When the PMLO bit = “0”, the mono receiver output enters power-down mode and the output is Hi-Z. When the
PMLO bit is “1” and LOPS bit is “1”, mono receiver output enters power-save mode. Pop noise at power-up/down can be
reduced by changing PMLO bit at LOPS bit = “0”. When PMLO bit = “1” and LOPS bit = “0”, mono receiver output
enters in normal operation. LOVL bit set the gain of mono receiver output.
DAC
“DACL”
“LOVL”
RCP pin
RCN pin
PMLO
0
1
Figure 51. Mono Receiver Output
LOVL
Gain
Output Voltage (typ)
0
+6dB
0.59 x AVDD @−6dBFS Default
1
+8dB
0.59 x AVDD @−8dBFS
Table 49. Mono Receiver Output Volume Setting
LOPS
Mode
RCP
RCN
x
Power-down
Hi-Z
Hi-Z
1
Power-save
Hi-Z
VCOM/2
0
Normal Operation Normal Operation Normal Operation
Table 50. Receiver-Amp Mode Setting (x: Don’t care)
Default
PMLO bit
LOPS bit
RCP pin
Hi-Z
Hi-Z
RCN pin Hi-Z
VCOM
VCOM
Hi-Z
>1ms
>0
Figure 52. Power-up/Power-down Timing for Receiver-Amp
MS0477-E-01
- 57 -
2006/10