LMV1031URX-20/NOPB National Semiconductor, LMV1031URX-20/NOPB Datasheet - Page 8

• Manufacturer Part Number: LMV1031URX-20/NOPB
• Description: IC AMP AUDIO MONO AB MIC 4USMD
• Manufacturer: National Semiconductor
• Type: Class ABr

Specifications of LMV1031URX-20/NOPB

• Output Type: 1-Channel (Mono)
• Voltage - Supply: 2 V ~ 5 V
• Features: Microphone
• Mounting Type: Surface Mount
• Package / Case: 4-MicroSMD
• Operational Class: Class-AB
• Audio Amplifier Output Configuration: 1-Channel Mono
• Audio Amplifier Function: Microphone
• Total Harmonic Distortion: 0.18%
• Single Supply Voltage (typ): 3V
• Dual Supply Voltage (typ): Not RequiredV
• Supply Current (max): 0.09@5VmA
• Power Supply Requirement: Single
• Rail/rail I/o Type: No
• Power Supply Rejection Ratio: 56dB
• Single Supply Voltage (min): 2V
• Single Supply Voltage (max): 5V
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 4
• Package Type: uSMD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Max Output Power X Channels @ Load: -
• Lead Free Status / Rohs Status: Compliant
• Other names: LMV1031URX-20

Application Section
(Continued)
The LMV1031 is optimized to be used in audio band appli-
cations. As shown in Figure 7, the LMV1031 provides a flat
gain response within the audio band and offers excellent
temperature stability.
ADVANTAGE OF THREE PINS
When implemented in an Electret Condenser Microphone
(ECM) the LMV1031 adds the advantages of a three pin
configuration. The third pin provides a low supply current,
higher PSRR, and eliminates the need for additional external
components.
It is well known that cell phone microphones are sensitive to
noise pick-up. A conventional JFET circuit is sensitive to
noise pick-up because of its high output impedance, which is
usually around 2.2 kΩ. The LMV1031 is less sensitive to
noise pick-up because it provides separate output and sup-
ply pins. Using separate pins greatly reduces the output
impedance.
20150821
FIGURE 7. Gain vs. Frequency
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