Sanyo LA7955 Specifications
Ordering number : ENN2740B
D2599TH (OT)/N1892TH/7110TS/6028MO, TS No. 2740-1/6
1
10
20
11
0.5
3.25
3.3
3.9max
24.2
0.67
2.54
1.2
0.25
7.62
6.4
SANYO: DIP20
[LA7955]
LA7955
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
Video Switch for TV / VCR Use
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 LA7955 Video Switch IC is used to switch the video
and audio signals of TVs, VCRs and similar equipment.
Separate pin layouts for the video and audio systems
facilitate board design. Tow signals can be selected from
the three input signals in a symmetrical arrangement
using a control signal. Law impedance lines (VCC, GND
and control input) between the input and output pins
minimize crosstalk caused by the high frequency of the
video section. The LA7955 operates on a 12V power
supply and is available in 20-pin plastic slim DIPs.
Functions
• Video applications : 3 inputs, 2 outputs
• Audio applications : 3 inputs, 2 outputs × 2 (L, R)
channels
• Built-in muting circuits for 2 left and right audio output
channels
Features
• Separate video and audio pin layouts
• Built-in 6dB video amps
• Wideband characteristics
• Minimal video and audio crosstalk
• 12V power supply
• 20-pin plastic slim DIP
Package Dimensions
unit : mm
3021B-DIP20
LA7955
No. 2740-2/6
Parameter Symbol Conditions Ratings Unit
Maximum Supply Voltage V
6
max 14.4 V
V
4
max
Maximum Control Signal Voltage V
8
max 14.4 V
V
10
max
Allowable Power Dissipation Pd max Ta ≤ 70°C 700 mW
Operating Temperature Topr –20 to +70 °C
Storage Temperature Tstg –55 to +125 °C
Specifications
Maximum Ratings at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Recommended Supply Voltage V
CC
12 V
Operating Supply Voltage Range
VCCop 8 to 13.2 Vs
Operating Conditions at Ta = 25°C
Operating Characteristics at Ta = 25°C, VCC= 12V
Parameter Symbol Conditions
Ratings
Unit
min typ max
Quiescent Current I
CC
35 43 57 mA
Video Input Bias Voltage V
1
, V3, V
7
4.4 4.7 5.0 V
Video Output Bias Voltage V
5
, V
9
6.2 6.8 7.4 V
Video Input Impedance Z
1
, Z3, Z7f = 1 kHz 15 21 27 kΩ
Video Output Impedance Z
5
, Z9f = 1 kHz 42 Ω
Video Voltage Gain G
VV
Vin = 1 Vp-p (sine wave), f = 0.1 MHz 5.6 6.1 6.6 dB
Video Frequency Bandwidth BW
V
Vin = 0.7 Vp-p (sine wave), –3 dB band for 0.1 MHz
10 MHz
Output Noise Voltage Vn
V
Rg = 75 Ω, 10 MHz band
0.3 1.0 mVrms
Video Crosstalk (between inputs 1 and 2) CT
V1
Rg = 75 Ω,
f = 3.58 MHz 45 50 dB
Video Crosstalk (between inputs 1/2 and 3) CT
V2
Rg = 75 Ω,
f = 3.58 MHz 45 50 dB
Video Output Hum Rejection HR
V
f = 50 Hz
, Rg = 75 Ω
18 23 dB
V
12
, V13,
Audio Input Bias Voltage V
14
, V17, 4.5 5.1 5.7 V
V
18
, V
19
Audio Output Bias Voltage
V
11
, V15,
3.2 3.8 4.4 V
V
18
, V
20
Audio Input Impedance (inputs 1 and 2)
Z
12
, Z13,
f = 1 kHz 47 68 88 kΩ
Z
15
, Z
19
Audio Input Impedance (input 3) Z14, Z17f = 1 kHz 51 74 95 kΩ
Audio Output Impedance
Z
11
, Z15,
75 Ω
Z
16
, Z
20
Audio Voltage Gain G
VA
f = 1 kHz, Vin = 500 mVrms –0.5 –0.02 +0.5 dB
Audio Frequency Bandwidth BW
A
–1 dB band (Vin = 500 mVrms) for f = 1 kHz gain
100 kHz
Total Harmonic Distortion THD f = 1 kHz, Vin = 500 mVrms 0.03 0.2 %
Output Noise Voltage Vn
A
Rg = 600 Ω, 20 Hz to 20 kHz bandwidth 10 50 µVrms
Audio Crosstalk (between inputs 1 and 2) CT
A1
Rg = less than 4.7 kΩ, f = 1 kHz (Vin = 500 mVrms)
75 90 dB
Audio Crosstalk (between inputs 1/2 and 3) CT
A2
Rg = less than 4.7 kΩ, f = 1 kHz (Vin = 500 mVrms)
75 90 dB
Audio Crosstalk (between L and R channels) CT
AS
Rg = 4.7 kΩ, f = 1 kHz (Vin = 500 mVrms) 72 82 dB
Mute Noise V
OAM
f = 1 kHz, Vin = 500 mVrms 0.02 0.1 mVrms
Audio Hum Rejection 1 HR1 Input Rg = 4.7 kΩ 40 46 dB
Audio Hum Rejection 2 HR2 Input open 28 39 dB
Switching Control Signal Input High Threshold Voltage
V
4TH
, V
8TH
1.1 1.4 1.7 V
Switching Control Signal Input Leak Current I
4L
, I
8L
–3 µA
Mute Input High Threshold Voltage
V
10TH
1.1 1.4 1.7 V
Mute Input Leak Current I
10L
–3 µA
Note: The current flowing to the IC is positive and current from the IC is negative.
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