LMV1088RL/NOPB National Semiconductor, LMV1088RL/NOPB Datasheet - Page 22

• Manufacturer Part Number: LMV1088RL/NOPB
• Description: IC AMP AUDIO MONO AB MIC 36USMD
• Manufacturer: National Semiconductor
• Series: PowerWise®r
• Type: Class ABr

Specifications of LMV1088RL/NOPB

• Output Type: 1-Channel (Mono)
• Voltage - Supply: 2.7 V ~ 5.5 V
• Features: Differential Inputs, I²C, Microphone, Mute
• Mounting Type: Surface Mount
• Package / Case: 36-MicroSMDxt
• Amplifier Class: AB
• No. Of Channels: 2
• Supply Voltage Range: 2.7V To 5.5V
• Load Impedance: 10kohm
• Operating Temperature Range: -40°C To +85°C
• Amplifier Case Style: SMD
• No. Of Pins: 36
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Max Output Power X Channels @ Load: -
• Other names: LMV1088RLTR

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MEASURING NOISE AND SNR
The overall noise of the LMV1088 is measured within the fre-
quency band from 10Hz to 22kHz using an A-weighted filter.
For the signal to noise ratio (SNR) the signal level at the out-
put is measured with a 1kHz input signal of 18mV
A-weighted filter. This voltage represents the output voltage
of a typical electret condenser microphone at sound pressure
level of 94dB SPL, which is the standard level for these mea-
surements. The LMV1088 is programmed for 17.5dB of total
FIGURE 12. Noise Measurement Setup
PP
using an
22
The Mic+ and Mic- inputs of the LMV1088 are shorted for AC
signals via a short between the input capacitors , see Figure
12.
gain (20dB pre-amplifier and -2.5dB post-amplifier) with only
Mic1 or Mic2 on. (See also I
The input signal is applied differential between the corre-
sponding Mic+ and Mic- . Because the part is in Pass Through
mode the Low-pass Filter at the output of the LMV1088 is
disabled.
2
C Compatible Interface)
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