WM9090ECS/R Wolfson Microelectronics, WM9090ECS/R Datasheet - Page 28

• Manufacturer Part Number: WM9090ECS/R
• Description: Audio CODECs Audio Subsystem w/ capless headphones
• Manufacturer: Wolfson Microelectronics

Specifications of WM9090ECS/R

• Interface Type: 2-Wire, l2C
• Thd Plus Noise: 80 dB
• Ic Function: Ultra Low Power Audio Subsystem
• Brief Features: Mono Class D Speaker Driver, Automatic Gain Control (AGC)
• Supply Voltage Range: 2.7V To 5.5V
• Operating Temperature Range: -40°C To +85°C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

WM9090
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Table 14 AGC Power Limit Control
R99 (63h)
AGC Control
1
REGISTER
ADDRESS
11:8
BIT
6:4
2:0
15
12
AGC_PWR_ENA
AGC_PWR_AVG
AGC_PWR_THR [2:0]
AGC_PWR_ATK [2:0]
AGC_PWR_DCY [2:0]
LABEL
DEFAULT
0000
000
000
1
0
Enable AGC Power Limit Mode
0 = Disabled
1 = Enabled
AGC Power Measurement mode
0 = Peak power
1 = RMS power
AGC Power Limit Threshold
Sets the output level at which
Power limiting will be applied.
Assumes RMS power mode and
8ohm speaker.
0000 = 300mW
0001 = 350mW
0010 = 400mW
0011 = 450mW
0100 = 500mW
0101 = 550mW
0110 = 600mW
0111 = 650mW
1000 = 700mW
1001 = 750mW
1010 = 800mW
1011 = 850mW
1100 = 900mW
1101 = 950mW
1110 = 1000mW
1111 = 1050mW
AGC Power Limiting Attack Rate
Sets the rate of AGC gain reduction
when power limiting is applied
000 = 120ms/6dB
001 = 480ms/6dB
010 = 840ms/6dB
011 = 1200ms/6dB
100 = 1680ms/6dB
101 = 2040ms/6dB
110 = 2760ms/6dB
111 = 4080ms/6dB
AGC Power Limiting Decay Rate
Sets the rate of AGC gain
increments after a period of power
limiting
000 = 1080ms/6dB
001 = 1200ms/6dB
010 = 1320ms/6dB
011 = 1680ms/6dB
100 = 2040ms/6dB
101 = 2760ms/6dB
110 = 4080ms/6dB
111 = 8160ms/6dB
PP, January 2010, Rev 3.0
DESCRIPTION
Pre-Production
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