1FEATURES

2• (Typical LMV1031-20, 2V Supply; Unless

Otherwise Noted)

• Signal to Noise Ratio 62 dB

• Output Voltage Noise (A-Weighted) −86 dBV

• Low Supply Current 72 μA

• Supply Voltage 2V to 5V

• Input Impedance >100 MΩ

• Max Input Signal 108 mVPP

• Output Voltage 1.09V

• Temperature Range −40°C to 85°C

• Large Dome 4-Bump DSBGA Package with

Improved Adhesion Technology

APPLICATIONS

• Mobile Communications - Bluetooth

• Accessory Microphone Products

• Cellular Phones

• PDAs

DESCRIPTION

The LMV1031 audio amplifier is an ideal replacement

for the JFET preamplifier that is currently used in the

electret microphones. The LMV1031 is optimized for

applications that require extended battery life, such

as Bluetooth communication links. The supply current

for the LMV1031 is only 72 μA. This is a dramatic

reduction from that required for a JFET equipped

microphone. The LMV1031, with its separate output

and supply pins, offers a higher PSRR and eliminates

the need for additional external components.

The LMV1031 is ensured to operate from 2V to 5V

supply voltage over the full temperature range, has a

fixed voltage gain of 20 dB and enhanced SNR

performance. The LMV1031 is optimized for an

output biasing of 1.09V.

The LMV1031 has less than 200Ω of output

impedance over the full audio bandwidth. The gain

response of the LMV1031 is flat within the audio band

and is stable over the temperature range.

The LMV1031 is available in a large dome 4-bump

ultra thin DSBGA package that can easily fit on the

PCB inside the miniature microphone metal can

(package). This package is designed for microphone

PCBs requiring 1 kg adhesion criteria.