MITSUMI
2-Input 1-Output Video Switch (75
driver)/3-Input 1-Output Video Switch (75
driver) MM1221~1228
2-Input 1-Output Video Switch (75
driver)/3-Input 1-Output Video Switch (75
driver)
Monolithic IC MM1221~MM1228
Outline
These ICs are high grade video switches with 2-input 1-output or 3-input 1-output and built-in 75
driver.
The series includes those with and without built-in clamp and 6dB amp circuits.
Circuit configuration tables and block diagrams are as follows.
MM1228 is used as the representative model in this description.
MM1221~MM1228 Series Circuit Configuration Table
MM1221~MM1228 Input/Output Voltage Measurement Values (typ.)
Model name
# of Inputs
# of Outputs
6dB amp circuit
Clamp circuit
Power supply voltage range
MM1221
2
1
No
No
8~13V
MM1222
2
1
Yes
No
8~13V
MM1223
3
1
No
No
8~13V
MM1224
3
1
Yes
No
8~13V
MM1225
2
1
No
Yes
4.7~13V
MM1226
2
1
Yes
Yes
4.7~13V
MM1227
3
1
No
Yes
4.7~13V
MM1228
3
1
Yes
Yes
4.7~13V
Model name
Power supply
5V
9V
12V
Unit
voltage
MM1221
Input voltage
4.53
6.05
V
Output voltage
4.5
6.1
V
MM1222
Input voltage
4.05
5.4
V
Output voltage
5.34
7.12
V
MM1223
Input voltage
4.53
6.05
V
Output voltage
4.5
6.1
V
MM1224
Input voltage
4.05
5.4
V
Output voltage
5.34
7.12
V
MM1225
Input voltage
1.27
2.17
2.86
V
Output voltage
1.31
2.25
2.96
V
MM1226
Input voltage
1.3
2.2
2.9
V
Output voltage
1.4
2.23
2.88
V
MM1227
Input voltage
1.27
2.17
2.86
V
Output voltage
1.31
2.25
2.96
V
MM1228
Input voltage
1.3
2.2
2.9
V
Output voltage
1.4
2.23
2.88
V
MITSUMI
2-Input 1-Output Video Switch (75
driver)/3-Input 1-Output Video Switch (75
driver) MM1221~1228
Control input truth table
Control input truth table
SW1
SW2
OUT
L
L
IN1
H
L
IN2
L/H
H
IN3
SW1
SW2
OUT
L
L
IN1
H
L
IN2
L/H
H
IN3
Block Diagram
(MM1221~MM1228)
SW
OUT
L
IN1
H
IN2
Control input truth table
SW
OUT
L
IN1
H
IN2
Control input truth table
MITSUMI
2-Input 1-Output Video Switch (75
driver)/3-Input 1-Output Video Switch (75
driver) MM1221~1228
Control input truth table
Control input truth table
SW1
SW2
OUT
L
L
IN1
H
L
IN2
L/H
H
IN3
SW1
SW2
OUT
L
L
IN1
H
L
IN2
L/H
H
IN3
Control input truth table
SW
OUT
L
IN1
H
IN2
Control input truth table
SW
OUT
L
IN1
H
IN2
MITSUMI
2-Input 1-Output Video Switch (75
driver)/3-Input 1-Output Video Switch (75
driver) MM1221~1228
Introduction of Main Model
3-Input 1-Output Video Switch (with 75
driver, clamp and 6dB amp)
Monolithic IC MM1228
Outline
This is a high performance 3-input 1-output video switch IC with 6dB amp, clamp and 75
driver circuits.
Output is 75
, and a 1V
P-P
video signal can be output externally.
Features
1. Built-in 75
driver circuit
2. Built-in 6dB amp
3. Built-in clamp circuit
4. Models in the MM1221~MM1228 series without clamp circuits able to support audio or chroma circuits
5. Mute operation possible
6. Wide operating power supply voltage range
4.7~13V
7. Low current consumption
8. Wideband frequency response
7MHz @ 0dB
9. Crosstalk
-70dB (4.43MHz)
Package
SOP-8C (MM1228XF)
SIP-8A (MM1228XS)
Applications
1. TV
2. VCR
3. Video cameras
4. Other video equipment
Block Diagram
SW1
SW2
OUT
L
L
IN1
H
L
IN2
L/H
H
IN3
Control input truth table
MITSUMI
2-Input 1-Output Video Switch (75
driver)/3-Input 1-Output Video Switch (75
driver) MM1221~1228
Pin Description
Pin no.
Pin name
Function
Internal equivalent circuit diagram
1
IN1
Input
3
IN2
5
IN3
2
SW1
Switch
4
SW2
7
OUT
Output
6
V
CC
Power supply
8
GND
Ground
MITSUMI
2-Input 1-Output Video Switch (75
driver)/3-Input 1-Output Video Switch (75
driver) MM1221~1228
Measuring Circuit
Absolute Maximum Ratings
(Ta=25C)
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
300
mW
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
4.7
13.0
V
Consumption current
Id
Refer to Measuring Circuit
8.4
10.9
mA
Voltage gain
G
V
Refer to Measuring Circuit
+5.5
+6.0
+6.5
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
30
mV
Crosstalk
C
T
Refer to Measuring Circuit
-64
-54
dB
SW1 input voltage H
V
IH
1
Refer to Measuring Circuit
2.1
V
SW1 input voltage L
V
IL
1
Refer to Measuring Circuit
0.7
V
SW2 input voltage H
V
IH
2
Refer to Measuring Circuit
2.1
V
SW2 input voltage L
V
IL
2
Refer to Measuring Circuit
0.7
V
MITSUMI
2-Input 1-Output Video Switch (75
driver)/3-Input 1-Output Video Switch (75
driver) MM1221~1228
Measuring Procedures
(V
CC
=5.0V, VC1=V
CC
, VC2=0V)
Item
Symbol
Switch state
Measuring Procedure
S1
S2
S3
S4
S5
Consumption
Id
2
2
2
2
2
current
1
2
2
2
2
Voltage gain
Gv
2
1
2
1
2
2
2
1
1
1
2
2
1
2
1
1
2
2
2
2
Frequency
F
C
2
1
2
1
2
characteristic
2
2
1
1
1
2
2
1
2
1
1
2
2
2
2
Differential gain
DG
2
1
2
1
2
2
2
1
1
1
2
2
1
2
1
1
2
2
2
2
Differential phase
DP
2
1
2
1
2
2
2
1
1
1
2
2
1
2
1
2
2
2
2
2
Output offset
Voff
2
2
2
1
2
voltage
2
2
2
1
1
1
2
2
1
2
1
2
2
2
1
1
2
2
1
1
Crosstalk
C
T
2
1
2
2
2
2
1
2
2
1
2
1
2
1
1
2
2
1
2
2
2
2
1
1
2
2
2
2
1
2
Switch 1 input
V
IH
1
voltage H
Switch 1 input
V
IL
1
voltage L
2
2
2
2
1
Switch 2 input
V
IH
2
voltage H
Switch 2 input
V
IL
2
voltage L
Connect a DC ammeter to the V
CC
pin and measure. The
ammeter is shorted for use in subsequent measurements.
Input a 1.0V
P-P
, 100kHz sine wave to SG, and obtain G
V
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
7MHz as V3, F
C
is obtained from the following formula.
F
C
=20LOG (V3/V2) dB
Input a 1.0V
P-P
staircase wave to SG, and measure
differential gain at TP4.
APL=10~90%
Proceed as for DG, and measure differential phase.
Measure the DC voltage difference of each switch
status at TP2.
Assume VC1=2.1V, VC2=0.7V.
Input a 1.0V
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 TP7 and TP8.
Gradually raise from VC1=0V. TP5 voltage when TP8
voltage is output on TP2 is V
IH
1. Gradually lower from
VC1=V
CC
. TP5 voltage when TP7 voltage is output on
TP2 is V
IL
1.
Impress an optional DC voltage on TP7 and TP9.
Gradually raise from VC1=0V. TP5 voltage when TP9
voltage is output on TP2 is V
IH
2. Gradually lower from
VC1=V
CC
. TP6 voltage when TP7 voltage is output on
TP2 is V
IL
2.
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