WM8976 Wolfson Microelectronics Ltd., WM8976 Datasheet - Page 93

• 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.

Pre-Production
w
35 (23h)
36 (24h)
37 (25h)
38 (26h)
39 (27h)
REGISTER
ADDRESS
3:0
8:4
3
2:0
8:5
4
3:0
8:6
5:0
8:0
8:0
BIT
ALCATK
NGEN
NGTH
PLL
PRESCALE
PLLN[3:0]
PLLK[23:18]
PLLK[17:9]
PLLK[8:0]
LABEL
00000
000
0000
000
01001001
0010
0010
0
0
1000
01100
1
01110100
1
DEFAULT
0001
0010
… (time doubles with every step)
1010
ALC attack (gain ramp-down) time
(ALCMODE == 0)
0000
0001
0010
… (time doubles with every step)
1010 or
higher
ALC attack (gain ramp-down) time
(ALCMODE == 1)
0000
0001
0010
… (time doubles with every step)
1010
Reserved
ALC Noise gate function enable
1 = enable
0 = disable
ALC Noise gate threshold:
000=-39dB
001=-45dB
010=-51db
… (6dB steps)
111=-81dB
Reserved
0 = MCLK input not divided (default)
1 = Divide MCLK by 2 before input to PLL
Integer (N) part of PLL input/output frequency
ratio. Use values greater than 5 and less than 13.
Reserved
Fractional (K) part of PLL1 input/output frequency
ratio (treat as one 24-digit binary number).
Fractional (K) part of PLL1 input/output frequency
ratio (treat as one 24-digit binary number).
Fractional (K) part of PLL1 input/output frequency
ratio (treat as one 24-digit binary number).
181.6us
363.2us
93ms
Per step
104us
208us
416us
106ms
Per step
22.7us
45.4us
90.8us
23.2ms
DESCRIPTION
1.453ms
2.905ms
744ms
Per 6dB
832us
1.664ms
3.328ms
852ms
Per 6dB
182.4us
363.2us
726.4us
186ms
10.53ms
21.06ms
5.39s
90% of
range
6ms
12ms
24.1ms
6.18s
90% of
range
1.31ms
2.62ms
5.26ms
1.348s
PP Rev 3.0 April 2006
Input Limiter/
Automatic
Level Control
(ALC)
Input Limiter/
Automatic
Level Control
(ALC)
Input Limiter/
Automatic
Level Control
(ALC)
Master Clock
and Phase
Locked Loop
(PLL)
Master Clock
and Phase
Locked Loop
(PLL)
Master Clock
and Phase
Locked Loop
(PLL)
Master Clock
and Phase
Locked Loop
(PLL)
Master Clock
and Phase
Locked Loop
(PLL)
REFER TO
WM8976
93