AK4650 Datasheet, PDF (40/86 Pages) Asahi Kasei Microsystems – 16Bit ΔΣ CODEC with MIC/HP/SPK-AMP & TSC

[AK4650]
The cut-off frequency of Headphone-amp output depends on the external resistor and capacitor used. Table 33 shows the
cut off frequency and the output power for various resistor/capacitor combinations. The Headphone impedance R_L is
16Ω. Output powers are shown at HVDD = 2.7, 3.0 and 3.3V. The output voltage of Headphone is 0.6 x AVDD (Vpp).
HP-AMP
AK4650
R
C _Headphone
16Ω
Figure 27. External Circuit Example of Headphone
R [Ω]
0
6.8
16
C [μF]
fc [Hz]
fc [Hz]
BOOST=OFF BOOST=MIN
Output Power [mW]
2.7V
3.0V
3.3V
220
45.2
100
99.5
17
27.9
34.5
41.7
42
100
69.8
47
148.5
28
13.7
17.0
20.5
74
100
49.7
47
105.8
19
7.0
8.6
10.4
46
Table 33. Relationship of external circuit, output power and frequency response
MS0502-E-01
- 40 -
2007/04