ak4537 AKM Semiconductor, Inc., ak4537 Datasheet - Page 33

• Manufacturer Part Number: ak4537
• Description: 16-bit 6 Stereo Codec With Mic/hp/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
The cut-off frequency of Headphone-amp output depends on the external resistor and capacitor used. Table 19 shows the
cut off frequency and the output power for various resistor/capacitor combinations. The headphone impedance R
Output powers are shown at HVDD = 2.7, 3.0 and 3.3V. The output voltage of headphone is 0.6 x AVDD (Vpp).
When an external resistor R is smaller than 12 , put an oscillation prevention circuit (0.22 F 20% capacitor and
10
MS0202-E-04
20% resistor) because it has the possibility that Headphone-amp oscillates.
R [ ]
6.2
6.2
16
16
C [ F]
100
100
47
47
Figure 27. External Circuit Example of Headphone
BOOST=OFF
HP-AMP
AK4537
fc [Hz]
152.5
105.8
71.2
49.7
Table 19. External Circuit Example
10
0.22
BOOST=MID
R
- 33 -
fc [Hz]
63
43
27
20
x x x x x
x x x x x
x x x x x
x x x x x
x x x x x
x x x x x
x x x x x
x x x x x
x x x x x
x x x x x
x x x x x
x x x x x
x x x x x
x x x x x
x x x x x
C
Headphone
2.7V
16
10.0
10.0
4.8
4.8
Output Power [mW]
3.0V
12.4
12.4
6.0
6.0
3.3V
15.0
15.0
7.2
7.2
[AK4537]
L
2005/04
is 16 .