WM8976GEFL/V Wolfson Microelectronics, WM8976GEFL/V Datasheet - Page 55

• Manufacturer Part Number: WM8976GEFL/V
• Description: Audio CODECs Mono ADC Stereo DAC with Spkr
• Manufacturer: Wolfson Microelectronics

Specifications of WM8976GEFL/V

• Mounting Style: SMD/SMT
• Package / Case: QFN-32
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Production Data
Headphone Output using DC Blocking Capacitors:
Figure 29 Recommended Headphone Output Configurations
w
Table 40 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 16Ω load and C1,
C2 = 220μF:
f
c
R52
LOUT1
Volume
control
R53
ROUT1
Volume
control
= 1 / 2π R
REGISTER
ADDRESS
L
C
1
= 1 / (2π x 16Ω x 220μF) = 45 Hz
7
6
5:0
8
7
6
5:0
8
BIT
HPVU
ROUT1ZC
ROUT1MUTE
ROUT1VOL
HPVU
LOUT1ZC
LOUT1MUTE
LOUT1VOL
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
Left 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)
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)
DESCRIPTION
c
PD Rev 4.4 July 2009
, improving the bass
WM8976
55