ASAHI KASEI
[AK4367]
The cut-off frequency of Headphone-amp output depends on the external resistor and capacitor used. Table 10 shows the
cut off frequency and the output power for various resistor/capacitor combinations. The headphone impedance RL is 16Ω.
Output powers are shown at HVDD = 2.4, 3.0 and 3.3V. The output voltage of headphone is 0.47 x VDD (Vpp)
@−4.8dBFS.
HP-AMP
R
C
Headphone
16Ω
AK4367
Figure 16. External Circuit Example of Headphone
fc [Hz]
BOOST=OFF
fc [Hz]
BOOST=MIN
Output Power [mW]
3.0V
R [Ω]
0
C [µF]
2.4V
15
3.3V
28
220
100
100
47
100
47
45
100
70
149
50
17
43
28
78
19
47
24
12
6
6.8
16
7
4
14
7
106
Table 10. Relationship of external circuit, output power and frequency response
MS0247-E-02
2005/10
- 20 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
