LM49370RL/NOPB National Semiconductor, LM49370RL/NOPB Datasheet - Page 34

• Manufacturer Part Number: LM49370RL/NOPB
• Description: IC AUDIO SUBSYSTEM 1.2W 49USMDXT
• Manufacturer: National Semiconductor
• Series: Boomer®, PowerWise®r
• Type: Class Dr

Specifications of LM49370RL/NOPB

• Output Type: 1-Channel (Mono) with Mono and Stereo Headphones
• Max Output Power X Channels @ Load: 1.2W x 1 @ 8 Ohm; 52mW x 2 @ 16 Ohm
• Voltage - Supply: 2.5 V ~ 5.5 V
• Features: 3D, Depop, I²C, I²S, Microphone, Mute, PCM, Shutdown, SPI, Standby, Volume Control
• Mounting Type: Surface Mount
• Package / Case: 49-MicroSMDxt
• Dc: 07+
• For Use With: LM49370RLEVAL - BOARD EVALUATION LM49370RL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM49370RLTR

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Bits
4:0
7:5
12.14 AGC_3 CONFIGURATION REGISTER
This register is used to control the LM49370's Automatic Gain Control. (Note 19)
Note 19: See the AGC overview.
AGC_HOLDTIME This programs the amount of delay before the AGC algorithm begins to adjust the gain of the microphone
AGC_ATTACK
Field
preamplifier.
This programs the speed at which the AGC will reduce gains if it detects the input level is too large.
AGC_HOLDTIME
00100
AGC_ATTACK
00000
00001
00010
00011
11101
11110
11111
2
000
001
010
011
100
101
110
111
TABLE 16. AGC_3 (0x0Ah)
to 11100
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
34
Description
No. of speech segments
Step Time (ms)
4 to 28
1024
2048
4096
128
256
512
29
30
31
32
64
0
1
2
3