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MITSUMI
3-Input 1-Output Video Switch (with Y-C mix) MM1188
3-Input 1-Output Video Switch (with Y-C mix)
Monolithic IC MM1188
Outline
This is a 3-input, 1-output video switch IC for video signal switching. Of the 3 inputs, one has an input pin
that supports S input, and there is a built-in mixing circuit.
Features
1. Built-in mixing circuit and input pin for S input
2. Built-in 6dB amp
3. Clamp function
(IN1-Y, IN2, IN3)
4. Mute function
5. Current consumption
12.5mA typ.
6. Operating power supply voltage range
8~13V
7. Frequency response
10MHz
8. Crosstalk
70dB (at 4.43MHz)
Package
SIP-9B (MM1188XS)
Applications
1. TV
2. VCR, etc.
Block Diagram
Control input truth table
SW1
SW2
OUT
L
L
IN1
H
L
IN2
-
H
IN3
MITSUMI
3-Input 1-Output Video Switch (with Y-C mix) MM1188
Pin Description
Pin no.
Pin name
Function
Internal equivalent circuit diagram
1
IN3
Input 3
9
IN2
Input 2
3
SW1
Switch 1
8
SW2
Switch 2
6
IN1-Y
Input 1
(luminance signal or
composite signal)
4
OUT
Output
2
V
CC
Power supply
5
GND
Ground
MITSUMI
3-Input 1-Output Video Switch (with Y-C mix) MM1188
7
IN1-C
Input 1 (chroma signal)
Absolute Maximum Ratings
(Ta=25C)
Electrical Characteristics
(Except where noted otherwise, Ta=25C, V
CC
=12.0V)
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
1100
mW
Item
Symbol
Measurement conditions
Min. Typ. Max. Units
Operating power supply voltage range
V
CC
8.0
13.0
V
Consumption current
Id
Refer to Measuring Circuit
8.8
12.5
16.5
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
60
mV
Crosstalk
C
T
Refer to Measuring Circuit
-70
-60
dB
Switch 1 input voltage H
V
IH
1
Refer to Measuring Circuit
2.3
V
Switch 1 input voltage L
V
IL
1
Refer to Measuring Circuit
0.9
V
Switch 2 input voltage H
V
IH
2
Refer to Measuring Circuit
2.3
V
Switch 2 input voltage L
V
IL
2
Refer to Measuring Circuit
0.9
V
IN1-C input dynamic range
A
DR
A
Refer to Measuring Circuit
1.0
V
P-P
B
DR
B
Refer to Measuring Circuit
1.2
V
P-P
IN1-Y, IN2, IN3 input dynamic range
DR
C
Refer to Measuring Circuit
1.5
V
P-P
IN1-C input impedance
Ri
15
k
IN1-C pin voltage
V
I1C
S1~S6=2
4.0
4.5
5.0
V
IN1-Y pin voltage
V
I1Y
S1~S6=2
4.1
4.6
5.1
V
IN2 pin voltage
V
I
2
S1~S4=S6=2, S5=1
4.1
4.6
5.1
V
IN3 pin voltage
V
I
3
S1~S5=2, S6=1
4.1
4.6
5.1
V
Out pin voltage
Vo
S1~S6=2
3.5
4.0
4.5
V
MITSUMI
3-Input 1-Output Video Switch (with Y-C mix) MM1188
Measuring Procedures
(Except where noted otherwise, V
CC
=12.0V, VC1=V
CC
, VC2=0V)
Item
Symbol
Switch state
Measuring Procedure
S1
S2
S3
S4
S5
S6
Consumption
Id
2
2
2
2
2
2
current
1
2
2
2
2
2
2
1
2
2
2
2
Voltage gain
G
V
2
2
1
2
1
2
2
2
2
1
1
1
2
2
2
1
2
1
1
2
2
2
2
2
2
1
2
2
2
2
Frequency
F
C
2
2
1
2
1
2
characteristic
2
2
2
1
1
1
2
2
2
1
2
1
2
1
2
2
2
2
Differential gain
DG
2
2
1
2
1
2
2
2
2
1
1
1
2
2
2
1
2
1
2
1
2
2
2
2
Differential phase
DP
2
2
1
2
1
2
2
2
2
1
1
1
2
2
2
1
2
1
2
2
2
2
2
2
Output offset
Voff
2
2
2
2
1
2
voltage
2
2
2
2
1
1
1
2
2
2
1
2
1
2
2
2
2
1
1
2
2
2
1
1
2
1
2
2
1
2
2
1
2
2
2
1
Crosstalk
C
T
2
1
2
2
1
1
2
2
1
2
2
2
2
2
1
2
2
1
2
2
1
2
1
1
2
2
2
1
2
2
2
2
2
1
1
2
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
2
1
Switch 2 input
V
IH
2
voltage H
Switch 2 input
V
IL
2
voltage L
3
1
2
2
2
2
A
DR
A
IN1-C input
dynamic
3
1
2
2
2
2
range
B
DR
B
IN1-Y, IN2, IN3
2
1
2
2
2
2
input dynamic
DR
C
2
2
1
2
1
2
range
2
2
2
1
1
1
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 Gv from the following formula given TP1
voltage as V1 and TP3 voltage as V2.
GV=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 1.0V
P-P
staircase wave to SG, and
measure differential gain at TP3.
*
1
APL=10~90%
Proceed as for DG, and measure differential
phase.
*
2
Measure the DC voltage difference of each
switch status at TP2.
Assume VC1=2.3V, VC2=0.9V.
Input a 1.0V
P-P
, 4.43MHz sine wave to SG, and
given TP3 voltage during signal output as V4,
switch S5 and S6, and given TP3 voltage for
output OFF 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. TP4 voltage when
TP8 voltage is output on TP2 is V
IH
1. Gradually
lower from VC1=V
CC
. TP4 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
. TP5 voltage when TP7
voltage is output on TP2 is V
IL
2.
Input a luminance signal as shown in Figure 1 to
SG1, and a chroma signal as shown in Figure 2
to SG2. Change the chroma signal amplitude and
measure the maximum amplitude where there is
no waveform distortion at TP3 and convert to
input amplitude.
Input a luminance signal as shown in Figure 3 to SG1,
and a chroma signal as shown in Figure 2 to SG2.
Change the chroma signal amplitude and measure the
maximum amplitude where there is no waveform
distortion at TP3 and convert to input amplitude.
Input a sine wave to SG1. Measure the maximum
amplitude where there is no waveform distortion
at TP3 and convert to input amplitude.
MITSUMI
3-Input 1-Output Video Switch (with Y-C mix) MM1188
Note :
*
1
*
2 Measurement of IN1-C and IN1-Y mixed differential gain and differential phase is as follows.
Switch status : S1=3, S2=1, S3=S4=S5=S6=2
Measuring procedure : Input a 1.0V
P-P
staircase wave signal (without chroma signal) to SG1,
and a chroma signal to SG2. Measure TP3 differential gain and differential phase.
0.286V
P-P
(40IRE)
Sync signal
Chroma
signal
variable
amplitude
0.714V
P-P
(100IRE)
0.286V
P-P
(40IRE)
1.0V
P-P
(140IRE)
Luminance
signal
Sync signal
Figure 1
Figure 3
Figure 2
Measuring Circuit
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