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MITSUMI
SDIP-22P
136924587
10 11
22 18 1521 19 17 16 1420 1213
3-Input 2-Output 3-Circuit Video Switch MM1238
3-Input 2-Output 3-Circuit Video Switch
Monolithic IC MM1238
Outline
This IC is a video switch developed for large and medium-sized high quality TVs, with 3-input and 2-output
circuits. It is suitable for BS, JSB, CS or M-N (Muse NTSC conversion) comparator switching. The BS-CS
decoder can be used as a W decoder.
Features
1. One of the two video signal outputs is for external output, and has a 6dB amp, 75Ω, 1VP
2. Input impedance
Video circuits 1~3
Audio circuits 1~3
15kΩ
68kΩ
3. Crosstalk
Video
Audio
Video : Audio
4. Frequency response
-
60dB (at 4.43MHz)
-
80dB (at 1kHz)
-
70dB (at 100kHz)
10MHz (6dB, 75Ω, amp only, 7MHz)
5. Power supply voltage 8.0V~13.0V
Package
SDIP-22A (MM1238XD)
Applications
1. TV
2. Free-standing VCR
3. Other video equipment
-
P
Pin Assignment
Pin no. Pin name Function Pin no. Pin name Function
1 L
2 V
3 R
4 C11 SW1 control 15 L
5 L
6 V
7 R
8 C12 SW1 control 19 R
9 L
10 V
11 R
IN1 Audio LIN1 12 C21 SW2 control
IN1 Video IN1 13 ROUT2 Audio ROUT2
IN1 Audio RIN1 14 VOUT2 Video OUT2
IN2 Audio LIN2 16 GND GND
IN2 Video IN2 17 C22 SW2 control
IN2 Audio RIN2 18 VCC Power supply
IN3 Audio LIN3 20 LOUT1 Audio LOUT1
IN3 Video IN3 21 VOUT1 Video OUT1
IN3 Audio RIN3 22 SAG Sag pin
OUT2 Audio LOUT2
OUT1 Audio ROUT1
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MITSUMI
Block Diagram
3-Input 2-Output 3-Circuit Video Switch MM1238
SW Logic
Control input Output signal
C11 C12 V
OUT1ROUT1LOUT1
L L Mute Mute Mute
L H VIn1 RIn1 LIn1
H L VIn2 RIn2 LIn2
H H VIn3 RIn3 LIn3
Control input Output signal
C21 C22 V
OUT2ROUT2LOUT2
L L Mute Mute Mute
L H VIn1 RIn1 LIn1
H L VIn2 RIn2 LIn2
H H VIn3 RIn3 LIn3
Absolute Maximum Ratings
Item Symbol Ratings Units
Storage temperature T
Operating temperature T
Power supply voltage V
Allowable loss Pd 800 mW
(Ta=25°C)
STG
OPR
CC 15 V
-
40~+125 °C
-
20~+75 °C
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MITSUMI
3-Input 2-Output 3-Circuit Video Switch MM1238
Electrical Characteristics
Item
Operating power supply voltage
Consumption current
V
OUT1 output
Voltage gain G
Frequency characteristic F
Differential gain DG1 TP8
Differential phase DP1 TP8
R
OUT1 output
Voltage gain G
Total harmonic distortion THD
Mute noise V
(Except where noted otherwise, Ta=25°C, VCC= 8V~13V)
Symbol
Measurement
circuit
Measurement conditions Min. Typ. Max. Units
VCC VCC 8.0 13.0 V
I
CC1VCC=9V 22.0 29.0 mA
I
CC2VCC=12V 25.0 33.0 mA
V1 TP7 SG2 : Sine wave 1VP-P, 0.1MHz 5.7 6.2 6.7 dB
1 TP7
V
SG2 : Sweep signal 1V
7MHz/0.1MHz
SG2 : Staircase wave 1V
P-P
P-P
APL=10, 50, 90%
SG2 : Staircase wave 1V
P-P
APL=10, 50, 90%
R1 TP5 SG3 : Sine wave 2.5VP-P, 1kHz
R1 TP5 SG3 : Sine wave 2.5VP-P, 1kHz 0.01 0.1 %
NM1 TP5 15kHz band during mute select 180
Output noise voltage VNR1 TP5 15kHz band during pin select 3 50
LOUT1 output
Voltage gain G
Total harmonic distortion THD
Mute noise V
L1 TP6 SG1 : Sine wave 2.5VP-P, 1kHz
L1 TP6 SG1 : Sine wave 2.5VP-P, 1kHz 0.01 0.1 %
NM2 TP6 15kHz band during mute select 180
Output noise voltage VNL1 TP6 15kHz band during pin select 3 50
VOUT2 output
Voltage gain Gv2 TP2 SG2 : Sine wave 1V
Frequency characteristic Fv2 TP2
Differential gain DG2 TP3
Differential phase DP2 TP3
R
OUT2 output
Voltage gain G
Total harmonic distortion THD
Mute noise V
R2 TP1 SG3 : Sine wave 2.5VP-P, 1kHz
R2 TP1 SG3 : Sine wave 2.5VP-P, 1kHz 0.01 0.1 %
NM3 TP1 15kHz band during mute select 180
SG2 : Sweep signal 1V
10MHz/0.1MHz
SG2 : Staircase wave 1V
APL=10, 50, 90%
SG2 : Staircase wave 1V
APL=10, 50, 90%
P-P, 0.1MHz
P-P
P-P
P-P
Output noise voltage VNR2 TP1 15kHz band during pin select 3 50
LOUT2 output
Voltage gain G
Total harmonic distortion THD
Mute noise V
L2 TP4 SG1 : Sine wave 2.5VP-P, 1kHz
L2 TP4 SG1 : Sine wave 2.5VP-P, 1kHz 0.01 0.1 %
NM4 TP4 15kHz band during mute select 180
Output noise voltage VNR2 TP4 15kHz band during pin select 3 50
Output offset voltage
OUT1 VOFF1 TP7
V
V
OUT2 VOFF2 TP2
OUT1 VOFF3 TP5
R
OUT2 VOFF4 TP1
R
OUT1 VOFF5 TP6
L
OUT2 VOFF6 TP4
L
V
OUT
1 pin DC level difference during switching
V
OUT
2 pin DC level difference during switching
R
OUT
1 pin DC level difference during switching
R
OUT
2 pin DC level difference during switching
L
OUT
1 pin DC level difference during switching
L
OUT
2 pin DC level difference during switching
-
1.0 0 1.0 dB
03%
0 3 deg
-
0.5 0 0.5 dB
-
0.5 0 0.5 dB
-
0.5 0 0.5 dB
-
1.0 0 1.0 dB
03%
0 3 deg
-
0.5 0 0.5 dB
-
0.5 0 0.5 dB
0 ±30 mV
0 ±15 mV
0 ±15 mV
0 ±15 mV
0 ±15 mV
0 ±15 mV
µVrms
µVrms
µVrms
µVrms
µVrms
µVrms
µVrms
µVrms
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MITSUMI
Input impedance
Output impedance
3-Input 2-Output 3-Circuit Video Switch MM1238
V
IN RIV VIN1~VIN315kΩ
IN RIR RIN1~RIN368kΩ
R
L
IN RIL LIN1~LIN368kΩ
V
OUT VOV VOUT250Ω
OUT VOR ROUT1 and ROUT250Ω
R
OUT VOL LOUT1 and L
L
Crosstalk
V
IN VOUT CTVV SG2 : 1VP-P, 4.43MHZ
IN ROUT CTRR SG3 : 2.5VP-P, 1kHZ
R
IN LOUT CTLL SG1 : 2.5VP-P, 1kHZ
L
V
IN ROUT CTRV SG2 : 1VP-P, 100kHz
IN LOUT CTLV SG2 : 1VP-P, 100kHz
V
Switch input voltage
SW input voltage H V
SW input voltage L V
Input dynamic range
V
IN VOUT D1 VCC=12V, SG1 : sine wave, 1kHz 2.6 VP-P
R
IN ROUT D2 Total higher harmonic 2.0 Vrms
L
IN LOUT D3 Total higher harmonic 2.0 Vrms
OUT250Ω
1
*
2
*
3
*
4
*
5
*
IH
IL
Switching H level for each IC SW
Switching L level for each IC SW
=12V, SG2 : sine wave, 1kHz
VCC
-
60-50 dB
-
80-70 dB
-
80-70 dB
-
70-60 dB
-
70-60 dB
2.1 V
0.7 V
distortion=0.5%
V
CC=12V, SG3 : sine wave, 1kHz
distortion=0.5%
1 Crosstalk (VIN VOUT)
*
Input a 1V
Obtain C
P-P, 4.43MHz sine wave to SG2.
TVV using the following formula given output amplitude for combinations other than those below
for SW control pin as V
1. C
TVV1
Measuring pin
TP8 BLHHL
O1, and for the combinations below as VO2.
C
TVV=20 log (VO2/VO1) dB
2. CTVV2
Switch status
Measuring pin
S2 V1 V2 V3 V4
ALLLH
AHL LH
AHHLH
BL LHL
BHHH L
CLLHH
C LHHH
CHLHH
Switch status
S2 V1 V2 V3 V4
ALHLL
ALHHL
A LHHH
BHLLL
TP3 BHL LH
BHLHH
CHHL L
CHHLH
CHHH L
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MITSUMI
2 Crosstalk (RIN ROUT)
*
Input a 2.5V
Obtain C
P-P, 1kHz sine wave to SG3.
TRR using the following formula given output amplitude for combinations other than those below
for SW control pin as V
1. C
TRR1
3-Input 2-Output 3-Circuit Video Switch MM1238
O3, and for the combinations below as VO4.
C
TRR=20 log (VO4/VO3) dB
2. CTRR2
Measuring pin
TP5 BLHHL
3 Crosstalk (LIN LOUT)
*
Input a 2.5V
Obtain C
P-P, 1kHz sine wave to SG3.
TLL using the following formula given output amplitude for combinations other than those below
for SW control pin as V
Switch status
Measuring pin
S3 V1 V2 V3 V4
ALLLH
AHL LH
AHHLH
BL LHL
BHHH L
CLLHH
C L HHH
CHLHH
5, and for the combinations below as VO6.
O
TLL=20 log (VO6/VO5) dB
C
Switch status
S3 V1 V2 V3 V4
ALHLL
ALHHL
A LHHH
BHLLL
TP1 BHL LH
BHLHH
CHHL L
CHHLH
CHHH L
1. C
TLL1
Measuring pin
Switch status
S1 V1 V2 V3 V4
ALLLH
AHL LH
AHHLH
BL LHL
TP6 BLHHL
BHHH L
CLLHH
C L HHH
CHLHH
2. CTLL2
Switch status
Measuring pin
S1 V1 V2 V3 V4
ALHLL
ALHHL
A LHHH
BHLLL
TP4 BHL LH
BHLHH
CHHL L
CHHLH
CHHH L
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MITSUMI
4 Crosstalk (VIN-ROUT, LOUT)
*
Input a 1Vp-p, 100kHz sine wave to SG2.
Obtain C
TRV (CTLV) using the following formula given output amplitude for combinations other than those
below for SW control pin as V
1. C
TRV
3-Input 2-Output 3-Circuit Video Switch MM1238
O7, and for the combinations below as VO8.
C
TRV (CTLV)=20 log (VO8/VO7) dB
2. CTLV
Measuring pin
TP5 BHLHL
TP1 BHLHL
Measuring Circuit
Switch status
S2 V1 V2 V3 V4
ALHLH
CHHHH
ALHLH
CHHHH
Measuring pin
Switch status
S2 V1 V2 V3 V4
ALHLH
TP6 BHLHL
CHHHH
ALHLH
TP4 BHLHL
CHHHH
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