ak4644 AKM Semiconductor, Inc., ak4644 Datasheet - Page 57

• Manufacturer Part Number: ak4644
• Description: Stereo Codec With Mic/hp/rcv-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
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.
MS0477-E-01
Mono Reveiver Output (RCP/RCN pins)
PMLO
0
1
RCN pin
RCP pin
PMLO bit
LOPS bit
Hi-Z
LOPS
LOVL
x
1
0
Figure 52. Power-up/Power-down Timing for Receiver-Amp
0
1
Table 50. Receiver-Amp Mode Setting (x: Don’t care)
Hi-Z
Table 49. Mono Receiver Output Volume Setting
VCOM
>1ms
DAC
Normal Operation
+6dB
+8dB
Gain
Figure 51. Mono Receiver Output
Power-down
Power-save
Mode
“DACL”
0.59 x AVDD @−6dBFS
0.59 x AVDD @−8dBFS
Output Voltage (typ)
- 57 -
Normal Operation
“LOVL”
RCP
Hi-Z
Hi-Z
Default
Normal Operation
RCP pin
RCN pin
VCOM/2
RCN
Hi-Z
VCOM
>0
Hi-Z
Hi-Z
Default
[AK4644]
2006/10