WM8980CGEFLSLASHV datasheet(39/123 Pages) WOLFSON

39 / 123 page

Pre-Production

WM8980

PP, Rev 3.8, May 2012

ATTACK AND DECAY TIMES

The attack and decay times set the update times for the PGA gain. The attack time is the time

constant used when the gain is reducing. The decay time is the time constant used when the gain is

increasing. In limiter mode, the time constants are faster than in ALC mode. The time constants are

shown below in terms of a single gain step, a change of 6dB and a change of 90% of the PGAs gain

range.

Note that, these times will vary slightly depending on the sample rate used (specified by the SR

NORMAL MODE

ALCMODE = 0 (Normal Mode)

ALCATK

tATK

tATK6dB

tATK90%

0000

104µs

832µs

6ms

0001

208µs

1.66ms

12ms

0010

416µs

3.33ms

24ms

0011

832µs

6.66ms

48ms

0100

1.66ms

13.3ms

96ms

0101

3.33ms

26.6ms

192ms

0110

6.66ms

53.2ms

384ms

0111

13.3ms

106ms

767ms

1000

26.6ms

213.2ms

1.53s

1001

53.2ms

426ms

3.07s

1010

106ms

852ms

6.13s

Attack Time (s)

ALCMODE = 0 (Normal Mode)

ALCDCY

tDCY

tDCY6dB

tDCY90%

0000

410µs

3.28ms

23.6ms

0001

820µs

6.56ms

47.2ms

0010

1.64ms

13.1ms

94.5ms

0011

3.28ms

26.2ms

189ms

0100

6.56ms

52.5ms

378ms

0101

13.1ms

105ms

756ms

0110

26.2ms

210ms

1.51s

0111

52.5ms

420ms

3.02s

1000

105ms

840ms

6.05s

1001

210ms

1.68s

12.1s

1010

420ms

3.36s

24.2s

Decay Time (s)

Table 19 ALC Normal Mode (Attack and Decay times)

WM8980CGEFL/V 数据表(PDF) 39 Page - Wolfson Microelectronics plc

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