Ordering number : EN5333A
Monolithic Linear IC
LA7473V
Overview
For Video Camera
Stereo Microphone Amplifier
The LA7473V is a microphone amplifier IC for video cameras that supports stereo audio recording and features low power
and the ability to operate from a 3V supply voltage. It achieves high audio quality by providing equalization circuits to
improve the frequency characteristics of the microphone and a left/right mixing circuit to improve the spatial presence of
the stereo image.
Features
•
Low power (For a 3.3V supply voltage : 18mW, for 4.75V : 28mW)
•
Low-voltage operation (2.7V minimum)
•
Low noise
•
Achieves high audio quality
- Provides built-in equalization circuits to improve the frequency characteristics of the microphone
- Provides a left/right mixing circuit to improve the spatial presence of the stereo image
Functions
•
Two microphone amplifier channels
•
Selector switch for internal and external microphones
•
High-pass filter (with bypass function)
•
Built-in microphone power supply
•
Ripple filter
•
External/internal microphone discrimination output
•
Mono/stereo discrimination output
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to
"standard application", intended for the use as general electronics equipment (home appliances, AV equipment,
communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be
intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace
instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety
equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case
of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee
thereof. If you should intend to use our products for applications outside the standard applications of our
customer who is considering such use and/or outside the scope of our intended standard applications, please
consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our
customer shall be solely responsible for the use.
Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate
the performance, characteristics, and functions of the described products in the independent state, and are not
guarantees of the performance, characteristics, and functions of the described products as mounted in the
customer
'
s products or equipment. To verify symptoms and states that cannot be evaluated in an independent
device, the customer should always evaluate and test devices mounted in the customer
'
s products or
equipment.
60408 MS PC/N1506 MS PC B8-2443 No.5333-1/11
LA7473V
Specifications
Maximum Ratings
at Ta = 25°C
Parameter
Maximum supply voltage
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VCC
Pd max
Topr
Tstg
Ta
≤
65°C
Conditions
Ratings
7.0
110
-10 to +65
-55 to +150
Unit
V
mV
°C
°C
Operating Conditions
at Ta = 25°C
Parameter
Recommended supply voltage
Recommended operating supply
voltage range
Symbol
VCC
VCC op
Conditions
Ratings
3.3 to 4.75
2.7 to 3.6, 4.5 to 5.5
Unit
V
V
Electrical Characteristics
at Ta
=
25°C, VCC = 3.3V, f = 1kHz, RL = 10kΩ
Parameter
Current drain
Symbol
ICC1
ICC2
Voltage gain
VG1
VG2
Total harmonic distortion
Maximum output voltage
Output noise voltage
THD
VOM
VNO1
VNO2
Input switching crosstalk
Inter-channel crosstalk
Internal microphone power
supply output voltage
Input switching control voltage
CTLH
CTLL
MIC MONO and EXT/INT output
level
Input impedance
VCH
VCL
ZIN1
ZIN2
ZIN3
Output impedance
Ripple rejection ratio
Inrush current
Power supply mode switching
voltage
ZO
VR
ICT
VCCLH
High level, the pin 1/pin 30 DC voltage
Low level, the pin 1/pin 30 DC voltage
High level, pin 15/pin 16
Low level, pin 15/pin 16
EXT MIC IN, L/Rch
IXT MIC IN, L/Rch
Pin 1/pin 30
Pin 13/pin 18
Output level at f = 100Hz and VIN = -20dBs
Pin 1/pin 30, with an applied voltage of 3.3V
The VCC (pin 7) switching voltages: Mode 1
(3.3V typical)/mode 2 (4.75V typical)
3.65
56
56
100
130
-50
47.5
4.45
70
70
1.3
-0.3
2.5
0.4
84
84
VCC
+0.7
V
V
V
V
kΩ
kΩ
kΩ
Ω
dBs
μA
V
SWCR
CHCR
VINM
EXT MIC IN, L/Rch
INT MIC IN, L/Rch
EXT MIC IN, L/Rch : VO = -10dBs
INT MIC IN, L/Rch : VO = -10dBs
EXT MIC IN, INT MIC IN, VO = -10dBs, L/Rch
EXT MIC IN, INT MIC IN, THD = 1%, L/Rch
EXT MIC IN, L/Rch, Rg = 1kΩ, JIS-A
INT MIC IN, L/Rch, Rg = 1kΩ, JIS-A
INT MIC IN
→
EXT MIC IN (Rg = 1kΩ)
f = 10kHz, L/Rch
EXT/INT MIC, Lch
→
Rch, Rch
→
Lch, f = 10kHz
The pin 31 DC level with a 30kΩ load
45
2.25
51
2.4
2.55
dB
V
70
0
22
16
80
32
24
Conditions
min
2.7
3.8
27.5
21
Ratings
typ
3.9
5.4
28
21.5
0.05
max
5.1
7.0
28.5
22
0.2
mA
mA
dB
dB
%
dBs
μVrms
μVrms
dB
Unit
No.5333-2/11
LA7473V
Electrical Characteristics
at Ta
=
25°C, VCC = 4.75V, f = 1kHz, RL = 10kΩ
Parameter
Current drain*
Symbol
ICC1
ICC2
Voltage gain
VG1
VG2
Total harmonic distortion
Maximum output voltage
Output noise voltage
THD
VOM
VNO1
VNO2
Input switching crosstalk
Inter-channel crosstalk
Internal microphone power
supply output voltage*
Input switching control voltage
CTLH
CTLL
MIC MONO and EXT/INT output
level*
Input impedance
VCH
VCL
ZIN1
ZIN2
ZIN3
Output impedance
Ripple rejection ratio
Inrush current*
ZO
VR
ICT
High level, the pin 1/pin 30 DC voltage
Low level, the pin 1/pin 30 DC voltage
High level, pin 15/pin 16
Low level, pin 15/pin 16
EXT MIC IN, L/Rch
IXT MIC IN, L/Rch
Pin 1/pin 30
Pin 13/pin 18
Output level at f = 100Hz and VIN = -20dBs
Pin 1/pin 30, with an applied voltage of 4.75V
56
56
100
130
-50
47.5
70
70
1.3
-0.3
3.8
0.4
84
84
VCC
+0.7
V
V
V
V
kΩ
kΩ
kΩ
Ω
dBs
μA
SWCR
CHCR
VINM
EXT MIC IN, L/Rch
INT MIC IN, L/Rch
EXT MIC IN, L/Rch : VO = -10dBs
INT MIC IN, L/Rch : VO = -10dBs
EXT MIC IN, INT MIC IN, VO = -10dBs, L/Rch
EXT MIC IN, INT MIC IN, THD = 1%, L/Rch
EXT MIC IN, L/Rch, Rg = 1kΩ, JIS-A
INT MIC IN, L/Rch, Rg = 1kΩ, JIS-A
INT MIC IN
→
EXT MIC IN (Rg = 1kΩ)
f = 10kHz, L/Rch
EXT/INT MIC, Lch
→
Rch, Rch
→
Lch, f = 10kHz
The pin 31 DC level with a 30kΩ load
45
2.15
51
2.3
2.45
dB
V
70
0
22
16
80
32
24
Conditions
min
3.0
4.1
27.5
21
Ratings
typ
4.5
5.8
28
21.5
0.05
max
5.9
7.5
28.5
22
0.2
mA
mA
dB
dB
%
dBs
μVrms
μVrms
dB
Unit
Note
*
: Items for which the ratings differ in 3.3V mode.
Package Dimensions
unit : mm (typ)
3191B
9.75
30
16
5.6
7.6
1
0.65
(0.33)
0.22
15
0.15
SANYO : SSOP30(275mil)
0.1
(1.3)
1.5max
0.5
No.5333-3/11
A
SW4
0.1μF
0.033μF
B
V30
+
VIN4
1kΩ
39kΩ
A A3
V26
V25
1μF
4.7kΩ
33kΩ
27kΩ
VO2
820Ω
0.033μF
1000pF
0.33μF
A
SW3
0.47μF
10kΩ
+
27
MIC VCC
-
+
+
EXT -
-
+
HPF ON
+
-
OFF
INT
VCC
26
25
24
23
22
21
20
19
18
17
16
B
VIN3
0.1μF
30
29
28
Block Diagram and Test Circuit
1kΩ
47kΩ
470kΩ
+
-
RIPPLE
FILTER
+
-
OFF
-
+
HPF ON
EXT -
+
INT
BIAS
4
5
+
6
7
+
SW5
A A1
4.7kΩ
8
9
10
11
12
13
14
15
VCC
-
+
Turn on at VCC = 4.5 to 5.5V
V16
LA7473V
+
-
V15
47kΩ 470kΩ
1
2
3
10μF
0.33μF
A
SW2
0.1μF
SW1
27kΩ
33kΩ
0.033μF
V14
0.33μF
+
B
B
VIN1
0.1μF
0.47μF
A
1μF
1kΩ
1kΩ
820Ω
+
VIN5
VCC
A A3
+
39Ω
VIN2
VO1
10kΩ
V1
No.5333-4/11
220kΩ
0.01μF
0.047μF
R-CH OUT EXT/INT
39kΩ
0.01μF
0.068μF
0.01μF
4.7kΩ
33kΩ
27kΩ
18
17
16
3.9kΩ
0.033μF
INT MIC L-CH
0.01μF
820Ω
0.033μF
0.047μF
1000pF
0.1μF
12kΩ
22
21
20
19
27
MIC VCC
-
+
+
EXT -
-
+
HPF ON
+
-
OFF
INT
26
25
24
23
0.47μF
Sample Application Circuit
30
29
28
2.2kΩ
1mH
+
-
RIPPLE
FILTER
+
-
OFF
-
+
HPF ON
EXT -
+
INT
BIAS
4
5
+
6
7
12kΩ
4.7kΩ
0.068μF
3.9kΩ
0.047μF
8
9
10
11
12
13
14
27kΩ
15
LA7473V
EXT MIC IN
0.033μF
0.047μF
0.01μF
0.01μF
INT MIC L-CH
1000pF
10μF
33kΩ
6.8kΩ
-
+
HPF ON
GND
R-CH OUT
INT/EXT
MIC MONO
L-CH OUT
1mH
820Ω
39kΩ
0.033μF
VCC
L-CH OUT
+
-
1000pF
6.8kΩ
1mH
CONTROL
30PIN 1PIN
H
H
H
L
L
H
L
L
MIC MIC MONO EXT/INT
(15PIN) (16PIN)
EXT
EXT
ST
INT
INT
ST
EXT
EXT MONO
EXT
ST
EXT
2.2kΩ
1
2
3
0.1μF
0.47μF
0.01μF
MIC MONO
No.5333-5/11
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