WM8976 Wolfson Microelectronics Ltd., WM8976 Datasheet - Page 52

• Manufacturer Part Number: WM8976
• Description: The WM8976 is a low power, high quality stereo codec designed for portable applications such as Digital still camera or Digital Camcorde
• Manufacturer: Wolfson Microelectronics Ltd.

WM8976
Headphone Output using DC Blocking Capacitors:
Figure 22 Recommended Headphone Output Configurations
w
Table 39 OUT1 Volume Control
When DC blocking capacitors are used, then their capacitance and the load resistance together
determine the lower cut-off frequency, f
response. Smaller capacitance values will diminish the bass response. Assuming a 16
C1, C2 = 220 F:
f
c
R52
LOUT1
Volume
control
R53
ROUT1
Volume
control
= 1 / 2 R
REGISTER
ADDRESS
L
C
1
= 1 / (2 x 16
7
6
5:0
8
7
6
5:0
8
BIT
LOUT1ZC
LOUT1MUTE
LOUT1VOL
HPVU
ROUT1ZC
ROUT1MUTE
ROUT1VOL
HPVU
x 220 F) = 45 Hz
LABEL
c
DC Coupled Headphone Output:
. Increasing the capacitance lowers f
Not latched
Not latched
DEFAULT
111001
111001
0
0
0
0
Headphone volume zero cross
enable:
1 = Change gain on zero cross only
0 = Change gain immediately
Left headphone output mute:
0 = Normal operation
1 = Mute
000000 = -57dB
...
111001 = 0dB
...
111111 = +6dB
LOUT1 and ROUT1 volumes do not
update until a 1 is written to HPVU
(in reg 52 or 53)
Headphone volume zero cross
enable:
1 = Change gain on zero cross only
0 = Change gain immediately
Right headphone output mute:
0 = Normal operation
1 = Mute
Right headphone output volume:
000000 = -57dB
...
111001 = 0dB
...
111111 = +6dB
LOUT1 and ROUT1 volumes do not
update until a 1 is written to HPVU
(in reg 52 or 53)
Left headphone output volume:
DESCRIPTION
PP Rev 3.0 April 2006
c
, improving the bass
Pre-Production
load and
52