MITSUMI
Pedestal Clamp 2-Input 1-Output 3-Circuit Video Switch MM1389
Pedestal Clamp 2-Input 1-Output 3-Circuit Video Switch
Monolithic IC MM1389
Outline
This is a video switch IC developed for use in video cameras, with 2-input and 1-output circuits. It has
pedestal clamp input, making it ideal for RGB and video signal switching,
Features
1. Pedestal clamp input
2. Low current consumption
12mA typ.(V
CC
5V)
3. Frequency response
10MHz typ. 0dB
4. Operating power supply voltage
4.5~12V
Package
SOP-16B (MM1389XF)
Applications
1. TV
2. VCR
3. Other video equipment
Block Diagram
SW
OUT
IN2a
L
IN2b
IN2c
IN1a
H
IN1b
IN1c
Control input truth table
MITSUMI
Pedestal Clamp 2-Input 1-Output 3-Circuit Video Switch MM1389
Absolute Maximum Ratings
(Ta=25C)
Item
Symbol
Ratings
Units
Storage temperature
T
STG
-40~+125
C
Operating temperature
T
OPR
-25~+75
C
Power supply voltage
V
CC
max.
15
V
Allowable loss
Pd
350
mW
Recommended Operating Conditions
Item
Symbol
Ratings
Units
Operating temperature
T
OPR
-25~+75
C
Operating voltage
V
OP
4.5~12.0
V
Electrical Characteristics
(Except where noted therwise, Ta=25C, V
CC
=5.0V)
Item
Symbol
Measurement conditions
Min. Typ. Max. Units
Consumption current
I
D
Refer to Measuring Circuit
12.0
17.0
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
Dynamic range 1
V
D
1
Refer to Measuring Circuit
1.40
1.65
V
P
-
P
Dynamic range 2
V
D
2
Refer to Measuring Circuit
0.80
0.95
V
P
-
P
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
Clamp pin input voltage H
V
CTH
Refer to Measuring Circuit
2.1
V
Clamp pin input voltage L
V
CTL
Refer to Measuring Circuit
0.7
V
V
D
1 : Positive dynamic range (from clamp level)
V
D
2 : Negative dynamic range (from clamp level)
MITSUMI
Pedestal Clamp 2-Input 1-Output 3-Circuit Video Switch MM1389
(Except where noted otherwise, V
CC
=5.0V, V
C
1=V
CC
, V
C
2=0V, PULSE=V
CC
, C1~C6=0.1F, impress V
B
=3.5V when S9 is 2)
Item
Symbol
Measurement conditions
Notes
Consumption current
I
D
Voltage gain
G
V
f=100kHz
V=2.0V
P-P
10MHz/100kHz
Frequency characteristic
F
C
V=2.0V
P-P
Dynamic range 1, 2
V
D
1
V
D
2
Crosstalk
C
T
f=4.43MHz
V=2.0V
P-P
Switch input voltage H, L
V
IH
V
IL
Clamp pin input voltage H, L
V
CTH
V
CTL
Connect a DC ammeter to the V
CC
pin and measure. The
ammeter is shorted for subsequent measurements.
Input a 2.0V
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
10MHz as V3, F
C
is obtained from the following formula.
F
C
=20Log (V3/V2) dB
Input a video signal to SG and a 5V
P-P
clamp pulse to PULSE.
Given input amplitude on the positive side of clamp level V
C
as V
D
1
IN
, and output amplitude as V
D
1
OUT
and negative side
input amplitude as V
D
2
IN
, and output amplitude as V
D
2
OUT
,
V
D
2 is obtained from the following formula.
V
D
1 : 20Log (V
D
1
OUT
/V
D
1
IN
) <
= V
D
1
IN
for-1dB
V
D
2 : 20Log (V
D
2
OUT
/V
D
2
IN
) <
= V
D
2
IN
for-1dB
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
Make S10, S12 and S14 1, and S11, S13 and S15 2.
Input a 2.0V
P-P
, 100kHz sine wave to SG, and raise
gradually from V
C
1=0V. TP4 voltage when the SG
signal appears on TP2 is VIN. Next, reverse S10~S15
settings and lower gradually from V
C
1=V
CC
. TP4
voltage when the SG signal appears on TP2 is V
IL
.
Impress 4V on VB and raise gradually from
PULSE=0V. TP11 voltage when less than 2.0V appears
on TP2 is V
CTH
. Lower from PULSE=V
CC
, and TP11
voltage when more than 2.2V appears on TP2 is V
CTL
.
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