Page 1
MITSUMI
2-Input 1-Output Video Switch (75Ω driver)/3-Input 1-Output Video Switch (75Ω driver) MM1221~1228
2-Input 1-Output Video Switch (75Ω driver)/3-Input 1-Output Video Switch (75Ω 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 75Ω 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
Page 2
MITSUMI
2-Input 1-Output Video Switch (75Ω driver)/3-Input 1-Output Video Switch (75Ω 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
Page 3
MITSUMI
2-Input 1-Output Video Switch (75Ω driver)/3-Input 1-Output Video Switch (75Ω 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
Page 4
MITSUMI
2-Input 1-Output Video Switch (75Ω driver)/3-Input 1-Output Video Switch (75Ω driver) MM1221~1228
Introduction of Main Model
3-Input 1-Output Video Switch (with 75Ω 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 75Ω driver circuits.
Output is 75Ω, and a 1V
P-P video signal can be output externally.
Features
1. Built-in 75Ω 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
Page 5
MITSUMI
2-Input 1-Output Video Switch (75Ω driver)/3-Input 1-Output Video Switch (75Ω 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
Page 6
MITSUMI
2-Input 1-Output Video Switch (75Ω driver)/3-Input 1-Output Video Switch (75Ω driver) MM1221~1228
Measuring Circuit
Absolute Maximum Ratings
(Ta=25°C)
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=25°C, VCC=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
-
10+1dB
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
IH1 Refer to Measuring Circuit 2.1 V
SW1 input voltage L V
IL1 Refer to Measuring Circuit 0.7 V
SW2 input voltage H V
IH2 Refer to Measuring Circuit 2.1 V
SW2 input voltage L V
IL2 Refer to Measuring Circuit 0.7 V
Page 7
MITSUMI
2-Input 1-Output Video Switch (75Ω driver)/3-Input 1-Output Video Switch (75Ω driver) MM1221~1228
Measuring Procedures
(VCC=5.0V, VC1=VCC, VC2=0V)
Item Symbol
Switch state
Measuring Procedure
S1 S2 S3 S4 S5
Consumption
Id
22222
current
12222
Voltage gain Gv
21212
22111
22121
12222
Frequency
F
C
21212
characteristic 22111
22121
12222
Differential gain DG
21212
22111
22121
12222
Differential phase DP
21212
22111
22121
22222
Output offset
Voff 22212
voltage
22211
12212
12221
12211
Crosstalk C
T
21222
21221
21211
22122
22112
22212
Switch 1 input
V
IH1
voltage H
Switch 1 input
V
IL1
voltage L
22221
Switch 2 input
V
IH2
voltage H
Switch 2 input
V
IL2
voltage L
Connect a DC ammeter to the VCCpin and measure. The
ammeter is shorted for use in subsequent measurements.
Input a 1.0VP
-
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
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
IH1. Gradually lower from
VC1=V
CC. TP5 voltage when TP7 voltage is output on
TP2 is V
IL1.
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
IH2. Gradually lower from
VC1=V
CC. TP6 voltage when TP7 voltage is output on
TP2 is V
IL2.
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