LMV1012-07/ LMV1012-15/ LMV1012-25 Analog Amplifier IC for High Gain Microphones
May 2003
LMV1012-07/ LMV1012-15/ LMV1012-25
Analog Pre-Amplified IC鈥檚 for High Gain Microphones
General Description
The LMV1012 is an audio amplifier series for small form
factor electret microphones. It is designed to replace the
JFET amplifier currently being used. The LMV1012 series is
ideally suited for applications requiring high signal integrity in
the presence of ambient or RF noise, such as in cellular
communications. The LMV1012 audio amplifiers are guaran-
teed to operate over a 2.2V to 5.0V supply voltage range
with fixed gains of 7.8dB, 15.6dB and 23.8dB. The devices
offer excellent gain accuracy and temperature stability as
compared to a JFET microphone.
The LMV1012 series enables a two-pin electret microphone
solution, which provides direct pin-to-pin compatibility with
the existing JFET market.
The devices are offered in two space saving 4-bump micro
SMD
鈩?/div>
packages. The LMV1012TP-07, LMV1012TP-15,
and LMV1012TP-25 are well suited for canister packages
1.8mm and thicker. The LMV1012UP-15 is ideal for canisters
1.3mm and thicker. These miniature packages are designed
for electret condenser microphones (ECM) form factor.
Features
(Typical LMV1012-15, 2.2V supply, R
L
= 2.2k鈩? C = 2.2碌F,
V
IN
= 18mV
PP
, unless otherwise specified)
n
Supply voltage
2V - 5V
<
180碌A(chǔ)
n
Supply current
n
Signal to noise ratio (A-weighted)
60dB
n
Output voltage noise (A-weighted)
鈭?9dBV
n
Total Harmonic Distortion
0.09%
n
Voltage gain
鈥?LMV1012-07
7.8dB
鈥?LMV1012-15
15.6dB
鈥?LMV1012-25
23.8dB
n
Temperature range
鈭?0藲C to 85藲C
n
Offered in 4-bump micro SMD packages:
鈥?0.93 x 1.0 x 0.4mm
鈥?0.93 x 1.0 x 0.5mm
Applications
n
n
n
n
n
n
Cellular phones
Headsets
Mobile communications
Automotive accessories
PDAs
Accessory microphone products
Schematic Diagram
Built-In Gain Electret Microphone
20072302
20072301
漏 2003 National Semiconductor Corporation
DS200723
www.national.com
1
2
3
