LMV1091TM/NOPB National Semiconductor, LMV1091TM/NOPB Datasheet - Page 15

• Manufacturer Part Number: LMV1091TM/NOPB
• Description: IC AMP MIC DUAL INPUT 25USMD
• Manufacturer: National Semiconductor
• Series: PowerWise®r
• Type: Class ABr

Specifications of LMV1091TM/NOPB

• Output Type: 2-Channel (Stereo)
• Voltage - Supply: 2.7 V ~ 5.5 V
• Features: Differential Inputs, Microphone, Shutdown
• Mounting Type: Surface Mount
• Package / Case: 25-MicroSMD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Max Output Power X Channels @ Load: -
• Other names: LMV1091TMTR

Pre-Amp/Post-Amp Gains
The Pre-amplifier gain of the LMV1091TM can be controlled
using the GA0-GA3 pins. See table 2 below for Pre-amplifier
Noise Reduction Mode Settings
The LMV1091TM has four mode settings. It can be placed in noise cancellation mode, mic 1 on with mic 2 off, mic 1 off with mic
2 on, and mic1 and mic2. See table 4 for control settings.
GA3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
GB2
Mode 1
0
0
0
0
1
1
1
1
0
0
1
1
GA2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
GB1
0
0
1
1
0
0
1
1
TABLE 4. Noise Reduction Mode Settings
Mode 0
TABLE 2. Mic Pre-Amp Gain Settings
0
1
0
1
TABLE 3. Post-Amp Gain Settings
GA1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
GB0
0
1
0
1
0
1
0
1
15
gain control. The Post-Amp gain can be controlled using the
GB0-GB2 pins. See table 3 below for Post-amplifier gain con-
trol.
GA0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Noise Reduction Mode Selection
Noise cancelling mode
Only Mic 1 On
Only Mic 2 On
Mic 1 + Mic 2
Post-Amplifier Gain
Pre-Amplifier Gain
12dB
15dB
18dB
18dB
18dB
18dB
6dB
9dB
10dB
12dB
14dB
16dB
18dB
20dB
22dB
24dB
26dB
28dB
30dB
32dB
34dB
36dB
6dB
8dB
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