Page 1
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
Model name # of Inputs # of Outputs Clamp circuit
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
Power supply voltage
MM1231~MM1234 Input/Output Voltage Measurement Values (typ.)
Model name
MM1231
MM1232
MM1233
Input / Output
voltage
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
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
Output voltage 2.10 4.30 6.00 V
Input clamp 1.40 2.50 3.30 V
Power supply voltage
Unit
5V 9V 12V
MM1234
Output voltage 0.70 2.20 2.90 V
Input clamp 1.40 2.50 3.30 V
Output voltage 0.70 2.20 2.90 V
Page 2
MITSUMI
2-Input 1-Output 3-Circuit Video Switch MM1231~1234
Block Diagram
MM1231 MM1232
MM1233 MM1234
(MM1231~MM1234)
Control input truth table
SW OUT
IN1A
L IN2A
IN3A
IN1B
H IN2B
IN3B
Page 3
MITSUMI
2-Input 1-Output 3-Circuit Video Switch MM1231~1234
Introduction of Main Model
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
Page 4
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
3 OUT1 Output
5 OUT2
6 OUT3
13 VCC Power supply
15 GND1 Ground
4 GND2
10 GND3
Page 5
MITSUMI
2-Input 1-Output 3-Circuit Video Switch MM1231~1234
Absolute Maximum Ratings
Item Symbol Ratings Units
Storage temperature T
Operating temperature T
Power supply voltage V
Allowable loss Pd
Electrical Characteristics
Item Symbol Measurement conditions Min. Typ. Max. Units
Operating power supply voltage range V
Consumption current Id Refer to Measuring Circuit 9.0 11.7 mA
Voltage gain G
Frequency characteristic F
Differential gain DG Refer to Measuring Circuit 0 ±3 %
(Except where noted otherwise, Ta=25°C, VCC=5.0V)
(Ta=25°C)
STG
OPR
CC 15 V
-
40~+125 °C
-
20~+75 °C
350 (SOP-16B)
mW
1200 (DIP-16B)
CC 4.6 13.0 V
V Refer to Measuring Circuit
C Refer to Measuring Circuit
-
0.5 0 +0.5 dB
-
10+1dB
Differential phase DP Refer to Measuring Circuit 0 ±3 deg
Output offset voltage Voff Refer to Measuring Circuit ±15 mV
Crosstalk C
Switch input voltage H V
Switch input voltage L V
T Refer to Measuring Circuit
IH Refer to Measuring Circuit 2.1 V
IL Refer to Measuring Circuit 0.7 V
-
70-60 dB
Output impedance Ro 25 Ω
Page 6
MITSUMI
2-Input 1-Output 3-Circuit Video Switch MM1231~1234
Measuring Procedures
Item
Consumption
current
Symbol
Id
(Except where noted otherwise, VCC=5.0V, VC1=VCC, VC2=0V)
Switch state
S1 S2 S3 S4 S5 S6 S7 S8
22222221
12222221
21222211
Voltage gain GV
22122222
22212212
22221223
22222113
12222221
21222211
Frequency
characteristic 22212212
22122222
Fc
22221223
22222113
12222221
21222211
Differential gain DG
22122222
22212212
22221223
22222113
12222221
21222211
Differential phase DP
22122222
22212212
22221223
22222113
22222221
22222211
Output offset
voltage 22222212
Voff
22222222
22222223
22222213
12222211
21222221
Crosstalk C
22122212
T
22212222
22221213
22222123
Switch input
voltage H
Switch input
voltage L
22222211
V
IH 22222212
22222213
22222211
V
IL 22222212
22222213
Measuring Procedure
Connect a DC ammeter to the VCCpin and measure. The
ammeter is shorted for use in subsequent measurements.
Input a 2.0VP
-
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
voltage for 10MHz as V3, F
V measurement, given TP3
C is obtained from
the following formula.
C=20LOG (V3/V2) dB
F
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.
T=20LOG (V5/V4) dB
C
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=VCC.
TP4 voltage when TP5, 7, 9 voltage is output on
TP2 is V
IL.
Page 7
MITSUMI
Measuring Circuit
2-Input 1-Output 3-Circuit Video Switch MM1231~1234
Loading...