ak4342 AKM Semiconductor, Inc., ak4342 Datasheet - Page 22

• Manufacturer Part Number: ak4342
• Description: 24-bit Stereo Dac With Hp-amp & 2v Line-out
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
The internal charge pump circuit generates negative voltage from PVDD voltage. The generated voltage is used to lineout
and headphone amplifiers. When PMCP bit is set to “1”, the charge pump circuit is powered-up. Then all clocks (MCLK,
BICK and LRCK) should be supplied. The power up time of charge pump circuit depends on FS3-0 bits (See Table 9).
Signal level from LIN/RIN is adjusted by an external resistor (Ri). Internal feedback resistance (Rf) is 20k ± 30% Ω.
When PMDAC, PMHP, PMLO or PMAUX bit is set to “1”, the left and right channel amplifiers are powered-up. The
transition time of signal path (LINL, LINR, RINL and RINR bits) is selected by PTS1-0 bits and FS3-0 bits. The signal
path (LINL, LINR, RINL and RINR bits) should not be changed during the transition.
MS0506-E-02
Charge Pump Circuit
Analog Input
FS3 bit
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
FS2 bit
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
LIN/RIN
Table 9. Power up time of Charge Pump Circuit
Figure 17. Block diagram of LIN/RIN inputs
FS1 bit
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
FS0 bit
Ri
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
- 22 -
11.025kHz
Frequency
22.05kHz
Sampling
(Reserve)
(Reserve)
(Reserve)
(Reserve)
44.1kHz
88.2kHz
32kHz
48kHz
64kHz
96kHz
16kHz
24kHz
12kHz
8kHz
Rf = 20kΩ
-
+
Power up time of
Charge Pump
(Reserve)
(Reserve)
(Reserve)
(Reserve)
11.6ms
10.7ms
11.6ms
10.7ms
11.6ms
10.7ms
11.6ms
10.7ms
Circuit
8.0ms
8.0ms
8.0ms
8.0ms
Default
[AK4342]
2006/07