WM8974GEFL/V Wolfson Microelectronics, WM8974GEFL/V Datasheet - Page 44

• Manufacturer Part Number: WM8974GEFL/V
• Description: Audio CODECs Mono Codec with Spkr
• Manufacturer: Wolfson Microelectronics

Specifications of WM8974GEFL/V

• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-24
• Minimum Operating Temperature: - 25 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

WM8974
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Table 39 SPKOUT Volume Control
ZERO CROSS TIMEOUT
Table 40 Timeout Clock Enable Control
MONO MIXER AND OUTPUT
A zero-cross timeout function is also provided so that if zero cross is enabled on the input or output
PGAs the gain will automatically update after a timeout period if a zero cross has not occurred. This
is enabled by setting SLOWCLKEN. The timeout period is dependent on the clock input to the digital
and is equal to 2
The MONOOUT pin can drive a 16Ω or 32Ω headphone or a line output or be used as a DC
reference for a headphone output (see Headphone Output section). It can be selected to drive out
any combination of DAC, Bypass (output of input BOOST stage) and AUX. This output is enabled
by setting bit MONOEN.
R54
Speaker volume
control
R7
Additional control
REGISTER
REGISTER
ADDRESS
ADDRESS
21
7
6
5:0
* input clock period.
0
BIT
BIT
SPKZC
SPKMUTE
SPKVOL
[5:0]
SLOWCLKEN
LABEL
LABEL
0
DEFAULT
0
0
111001
(0dB)
DEFAULT
Slow clock enable. Used for both the jack
insert detect debounce circuit and the zero
cross timeout.
0 = slow clock disabled
1 = slow clock enabled
1 = Change gain on zero cross only
0 = Change gain immediately
0=Speaker output enabled
1=Speaker output muted (VMIDOP)
Speaker Volume Adjust
111111 = +6dB
111110 = +5dB
… (1.0 dB steps)
111001=0dB
…
000000=-57dB
Speaker Volume control zero cross enable:
Speaker output mute enable
PD, Rev 4.5, September 2008
DESCRIPTION
DESCRIPTION
Production Data
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