Sanyo LA7471M Specifications
Ordering number : EN4488A
O3098HA (OT)/40596TH/42094TH (OT) B-0326 No. 4488-1/10
LA7471M
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
Two-Channel Microphone Amplifier
for Video Camera
Monolithic Linear IC
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
Overview
The LA7471M is a stereo microphone amplifier for use in
video camera products. It includes an automatic wind
noise detection and removal circuit, an equalization circuit
to compensate for microphone frequency characteristics
and an L/R mixing circuit to provide a good stereo image.
The LA7471M provides high quality audio for video
camera applications.
Functions
• Microphone amplifier (two channels)
• Internal/external microphone switching
• Automatic wind noise detection/prevention circuit
• High-pass filter and disable switch
• Internal microphone power supply
• External microphone power supply (with current
limiter)
• Ripple filter
• Stereo/mono detection for external microphones
Features
• Automatic wind noise detection and exclusion circuit
(The high-pass filter provides a first-order to third-order
linear conversion.)
• High-quality audio (low noise, microphone frequency
characteristic compensation, and stereo enhancement)
Package Dimensions
unit: mm
3162B-QFP36
Specifications
Maximum Ratings at Ta = 25°C
Operating Conditions at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
CC
max 7.0 V
Allowable power dissipation Pd max Ta ≤ 65°C 300 mW
Operating temperature Topr –10 to +65 °C
Storage temperature Tstg –55 to +150 °C
Parameter Symbol Conditions Ratings Unit
Recommended supply voltage V
CC
5.0 V
Operating supply voltage range V
CC
op 4.5 to 5.5 V
SANYO: QFP36
[LA7471M]
Operating Characteristics at Ta = 25°C, VCC= 5.0 V, f = 1.0 kHz, RL= 10 kΩ
Block Diagram
No. 4488-2/10
LA7471M
Parameter Symbol Conditions
Ratings
Unit
min typ max
Current dissipation
I
CC1
INT MIC in, EXT VCCoff, L/Rch 5.5 8 10.5 mA
I
CC2
INT MIC in, EXT VCCon, L/Rch 6 9 12 mA
VG
1
EXT MIC in, L/Rch 27.3 27.8 28.3 dB
Voltage gain
VG
2
INT MIC in, Gain CTL Hi, L/Rch 23.8 24.3 24.8 dB
VG
3
INT MIC in, Gain CTL Mi, L/Rch 20.8 21.3 21.8 dB
VG
4
INT MIC in, Gain CTL Lo, L/Rch 17.8 18.3 18.8 dB
Total harmonic distortion THD
INT MIC in, EXT MIC in
0.05 0.2 %
V
O
= 300 mVrms, L/Rch
Maximum output V
OM
INT MIC in, EXT MIC in
1.0 1.4 Vrms
THD = 1%, L/Rch
V
NO1
EXT MIC in, L/Rch, Rg = 1 kΩ, JIS-A 22 32 µVrms
Output noise voltage
V
NO2
INT MIC in, L/Rch, Rg = 1 kΩ, JIS-A
16 24 µVrms
Gain CTL Hi, Mi, Lo
Input switch crosstalk SW
CR
INT MIC in → EXT MIC in (Rg = 1 kΩ)
80 70 dB
f = 10 kHz, L/Rch
Inter-channel crosstalk CH
CR
INT/EXT MIC, Lch → Rch, Rch → Lch,
51 45 dB
f = 10 kHz
Internal microphone power supply
V
INM
When pin 31 is DC, with 30 kΩ load 2.65 2.8 2.95 V
output voltage
External power supply output voltage V
EXM
When connected to pin 16 (output current) 4.0 4.5 V
External power supply limiter current I
LIM
When connected to pin 16 (output current) 30 mA
Input switching control voltage
CTL
H
High level, pin 29/pin 35 DC 1.3 V
CC
V
CTL
L
Low level, pin 29/pin 35 DC 0 0.7 V
Input impedance Z
IN
INT/EXT MIC in, L/Rch 60 75 90 kΩ
Output impedance Z
O
Pins 8 and 20 1 5 Ω
Unit (resistance: Ω)
Test Circuit Diagram
No. 4488-3/10
LA7471M
Unit (resistance: Ω, capacitance: F)
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