ak4372 ETC-unknow, ak4372 Datasheet - Page 30

• Manufacturer Part Number: ak4372
• Description: Dac With Built-in Pll & Hp-amp
• Manufacturer: ETC-unknow

< External Circuit of Headphone-Amp >
The cut-off frequency of the headphone-amp output depends on the external resistor and capacitor used.
the cut off frequency and the output power for various resistor/capacitor combinations. The headphone impedance R
16Ω. Output powers are shown at AVDD = 2.4, 3.0 and 3.3V. The output voltage of the headphone-amp is 0.48 x AVDD
(Vpp) @−3dBFS.
< Wired OR with External Headphone-Amp >
When PMVCM=PMHPL=PMHPR bits = “0” and HPZ bit = “1”, Headphone-amp is powered-down and HPL/R pins are
pulled-down to VSS1 by 200kΩ (typ). In this setting, it is able to connect headphone-amp of AK4372 and external single
supply headphone-amp by “wired OR”.
MS0684-E-02
PMVCM
R [Ω]
6.8
16
0
x
0
1
1
C [μF]
220
100
100
100
47
47
PMHPL/R
Table 23. Relationship of external circuit, output power and frequency response
0
0
1
1
BOOST=OFF
fc [Hz]
100
149
106
45
70
50
HPMTN
Figure 23. External Circuit Example of Headphone
HP-AMP
AK4372
Table 24. HP-Amp Mode Setting (x: Don’t care)
Figure 24. Wired OR with External HP-Amp
x
x
0
1
Another
HP-Amp
AK4372
BOOST=MIN
fc [Hz]
HPL pin
HPR pin
17
43
28
78
19
47
HPZ
0
1
x
x
R
- 30 -
Power-down & Mute
C
Normal Operation
2.4V
21
10
5
Power-down
Headphone
Mode
Mute
16Ω
Headphone
Output Power [mW]
3.0V
33
16
8
Pull-down by 200kΩ
Normal Operation
HPL/R pins
VSS1
VSS1
3.3V
40
20
10
Table 23
[AK4372]
2008/12
(default)
shows
L
is