MITSUMI
2-Input 1-Output 3-Circuit Video Switch MM1231~1234
2-Input 1-Output 3-Circuit Video Switch
Monolithic IC MM1231~1234
Outline
This is serial 2-input, 1-output, 3-circuit video switch IC for video / audio signal switching with and without
clamp circuit.
Circuit configuration tables and block diagrams are as follows.
MM1234 is used as the representative model in this description.
MM1231~MM1234 Series Circuit Configuration Table
MM1231~MM1234 Input/Output Voltage Measurement Values (typ.)
Model name
# of Inputs
# of Outputs
Clamp circuit
Power supply voltage
MM1231
2
1
No
4.6~13.0V
MM1232
2
1
1 input
4.6~13.0V
MM1233
2
1
2 input
4.6~13.0V
MM1234
2
1
3 input
4.6~13.0V
Model name
Input / Output
Power supply voltage
Unit
voltage
5V
9V
12V
MM1231
Input voltage
2.80
5.00
6.70
V
Output voltage
2.01
4.30
6.00
V
Input voltage
2.80
5.00
6.70
V
MM1232
Output voltage
2.10
4.30
6.00
V
Input clamp
1.40
2.50
3.30
V
Output voltage
0.70
2.20
2.90
V
Input voltage
2.80
5.00
6.70
V
MM1233
Output voltage
2.10
4.30
6.00
V
Input clamp
1.40
2.50
3.30
V
Output voltage
0.70
2.20
2.90
V
MM1234
Input clamp
1.40
2.50
3.30
V
Output voltage
0.70
2.20
2.90
V
MITSUMI
2-Input 1-Output 3-Circuit Video Switch MM1231~1234
Block Diagram
(MM1231~MM1234)
Control input truth table
SW
OUT
IN1A
L
IN2A
IN3A
IN1B
H
IN2B
IN3B
MM1231
MM1232
MM1233
MM1234
MITSUMI
2-Input 1-Output 3-Circuit Video Switch MM1231~1234
2-Input 1-Output 3-Circuit Video Switch
Monolithic IC MM1234
Outline
This is a video switch for video signal switching, with 2-input and 1-output circuits built in. All three circuits
have a clamp function.
Features
1. 3 circuits built in, 2-input and 1-output
2. Clamp function
3. Current consumption
9.0mA typ.
4. Operating power supply voltage range
4.6~13.0V
5. Frequency response
10MHz
6. Crosstalk
70dB (at 4.43MHZ)
Package
SOP-16B
DIP-16B
Applications
1. TV
2. VCR
3. Other video equipment
Introduction of Main Model
MITSUMI
2-Input 1-Output 3-Circuit Video Switch MM1231~1234
Pin Description
Pin no.
Pin name
Function
Internal equivalent circuit diagram
16
IN1A
Input
1
IN1B
11
IN2A
14
IN2B
8
IN3A
9
IN3B
2
SW1
Switch
12
SW2
7
SW3
15
GND1
Ground
4
GND2
10
GND3
3
OUT1
Output
5
OUT2
6
OUT3
13
V
CC
Power supply
MITSUMI
2-Input 1-Output 3-Circuit Video Switch MM1231~1234
Absolute Maximum Ratings
(Ta=25C)
Electrical Characteristics
(Except where noted otherwise, Ta=25C, V
CC
=5.0V)
Item
Symbol
Measurement conditions
Min. Typ. Max. Units
Operating power supply voltage range
V
CC
4.6
13.0
V
Consumption current
Id
Refer to Measuring Circuit
9.0
11.7
mA
Voltage gain
G
V
Refer to Measuring Circuit
-0.5
0
+0.5
dB
Frequency characteristic
F
C
Refer to Measuring Circuit
-1
0
+1
dB
Differential gain
DG
Refer to Measuring Circuit
0
3
%
Differential phase
DP
Refer to Measuring Circuit
0
3
deg
Output offset voltage
Voff
Refer to Measuring Circuit
15
mV
Crosstalk
C
T
Refer to Measuring Circuit
-70
-60
dB
Switch input voltage H
V
IH
Refer to Measuring Circuit
2.1
V
Switch input voltage L
V
IL
Refer to Measuring Circuit
0.7
V
Output impedance
Ro
25
Item
Symbol
Ratings
Units
Storage temperature
T
STG
-40~+125
C
Operating temperature
T
OPR
-20~+75
C
Power supply voltage
V
CC
15
V
Allowable loss
Pd
350 (SOP-16B)
1200 (DIP-16B)
mW
MITSUMI
2-Input 1-Output 3-Circuit Video Switch MM1231~1234
Measuring Procedures
(Except where noted otherwise, V
CC
=5.0V, VC1=V
CC
, VC2=0V)
Item
Symbol
Switch state
Measuring Procedure
S1 S2 S3 S4 S5 S6 S7 S8
Consumption
Id
2
2
2
2
2
2
2
1
current
1
2
2
2
2
2
2
1
2
1
2
2
2
2
1
1
Voltage gain
GV
2
2
1
2
2
2
2
2
2
2
2
1
2
2
1
2
2
2
2
2
1
2
2
3
2
2
2
2
2
1
1
3
1
2
2
2
2
2
2
1
2
1
2
2
2
2
1
1
Frequency
Fc
2
2
1
2
2
2
2
2
characteristic
2
2
2
1
2
2
1
2
2
2
2
2
1
2
2
3
2
2
2
2
2
1
1
3
1
2
2
2
2
2
2
1
2
1
2
2
2
2
1
1
Differential gain
DG
2
2
1
2
2
2
2
2
2
2
2
1
2
2
1
2
2
2
2
2
1
2
2
3
2
2
2
2
2
1
1
3
1
2
2
2
2
2
2
1
2
1
2
2
2
2
1
1
Differential phase
DP
2
2
1
2
2
2
2
2
2
2
2
1
2
2
1
2
2
2
2
2
1
2
2
3
2
2
2
2
2
1
1
3
2
2
2
2
2
2
2
1
2
2
2
2
2
2
1
1
Output offset
Voff
2
2
2
2
2
2
2
2
voltage
2
2
2
2
2
2
1
2
2
2
2
2
2
2
2
3
2
2
2
2
2
2
1
3
1
2
2
2
2
2
1
1
2
1
2
2
2
2
2
1
Crosstalk
C
T
2
2
1
2
2
2
1
2
2
2
2
1
2
2
2
2
2
2
2
2
1
2
1
3
2
2
2
2
2
1
2
3
2
2
2
2
2
2
1
1
Switch input
V
IH
2
2
2
2
2
2
1
2
voltage H
2
2
2
2
2
2
1
3
2
2
2
2
2
2
1
1
Switch input
V
IL
2
2
2
2
2
2
1
2
voltage L
2
2
2
2
2
2
1
3
Connect a DC ammeter to the V
CC
pin and measure. The
ammeter is shorted for use in subsequent measurements.
Input a 2.0V
P-P
, 100kHz sine wave to SG, and
obtain Gv from the following formula given TP1
voltage as V1 and TP3 voltage as V2.
G
V
=20LOG (V2/V1) dB
For the above G
V
measurement, given TP3
voltage for 10MHz as V3, F
C
is obtained from
the following formula.
F
C
=20LOG (V3/V2) dB
Input a 2.0V
P-P
staircase wave to SG, and
measure differential gain at TP3.
APL=10~90%
Proceed as for DG, and measure differential
phase.
Measure the DC voltage difference at TP2 for
each switch for VC1 and VC2.
Assume VC1=2.1V, VC2=0.7V. Input a 2.0V
P-P
,
4.43MHz sine wave to SG, and given TP1
voltage as V4 and TP3 voltage as V5, C
T
is
obtained from the following formula.
C
T
=20LOG (V5/V4) dB
Impress an optional DC voltage on TP5 7, 9 and
TP6, 8 and 10. Gradually raise from VC1=0V.
TP4 voltage when TP6, 8, 10 voltage is output
on TP2 is V
IH
. Gradually lower from VC1=V
CC
.
TP4 voltage when TP5, 7, 9 voltage is output on
TP2 is V
IL
.
MITSUMI
2-Input 1-Output 3-Circuit Video Switch MM1231~1234
Measuring Circuit
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