MITSUMI
I
2
C Bus Video Switch MM1250
I
2
C Bus Video Switch
Monolithic IC MM1250
Outline
This IC is an audio/video switch that supports an I
2
C bus for television.
Features
1. Utilizes serial control by I
2
C bus
2. 3 video input systems for 3 outputs, V
OUT
, Y
OUT
and C
OUT
3. V
OUT
has built-in 6dB amp
4. V
OUT
has built-in output clamp circuit
5. Audio system has built-in mute function
6. 1 output port built-in
7. Operating power supply voltage range
8~13V
8. Video frequency response
10MHz
9. Slave address
92H (fixed)
Package
SDIP-24A (MM1250XD)
Applications
I
2
C bus televisions, etc.
MITSUMI
I
2
C Bus Video Switch MM1250
Block Diagram
Fig. 1 Block Diagram
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
1000
mW
MITSUMI
I
2
C Bus Video Switch MM1250
Item
Symbol
Measurement
Measurement conditions
Min. Typ. Max. Units
circuit
Operating power supply voltage
V
CC
V
CC
8.0
13.0
V
Consumption current
I
CC
V
CC
=9V
17
25
33
mA
V
OUT
output
Voltage gain
G
V
1
TP9
SG1 : sine wave 1V
P-P
, 0.1MHz
5.5
6.0
6.5
dB
G
V
2
TP7
Frequency characteristic
F
V
1
TP9
SG1 : sweep signal, 1V
P-P
F
V
2
TP7
10MHz/0.1MHz
-1.0
0
1.0
dB
Differential gain
DG
V
1
TP9
SG1 : staircase wave, 1V
P-P
DG
V
2
TP8
APL=10, 50, 90%
-3
0
3
%
Differential phase
DP
V
1
TP9
SG1 : staircase wave, 1V
P-P
DP
V
2
TP8
APL=10, 50, 90%
-3
0
3
deg
Input dynamic
D
V
1
TP9
SG1 : range sine wave, 1kHz
2.1
V
P-P
D
V
2
TP8
Output offset voltage
V
OFFV
TP9
V
OUT
1 pin DC level difference during switching
0
30
mV
Input impedance
Z
IV
V
TV
, V
E
1, V
E
2
10
15
20
k
Output impedance
Z
OV
2
10
20
30
Y
OUT
output
Voltage gain
G
Y
1
TP1
SG1 : sine wave, 1V
P-P
, 0.1MHz
5.5
6.0
6.5
dB
G
Y
2
TP1
SG6 : sine wave, 2V
P-P
, 0.1MHz
-0.5
0
0.5
dB
F
Y
1
TP1
SG1 : sweep signal, 1V
P-P
Frequency characteristic
10MHz/0.1MHz
-1.0
0
1.0
dB
F
Y
2
TP1
SG6 : sweep signal, 2V
P-P
10MHz/0.1MHz
-1.0
0
1.0
dB
Differential gain
DG
Y
TP2
SG1 : staircase wave, 1V
P-P
APL=10, 50, 90%
-3
0
3
%
Differential phase
DP
Y
TP2
SG1 : staircase wave, 1V
P-P
APL=10, 50, 90%
-3
0
3
deg
Input dynamic range
D
Y
1
TP1
SG6 : sine wave, 1kHz, Comp mode
4.2
V
P-P
D
Y
2
TP1
SG1 : sine wave, 1kHz, TH
S mode
2.1
Output offset voltage
V
OFFY
TP1
Y
OUT
1 pin DC level difference during switching
0
30
mV
Input impedance
Z
IY
Y
IN
10
15
20
k
Output impedance
Z
OY
8
15
22
C
OUT
output
G
C
1
TP4
SG1 : sine wave, 1V
P-P
, 0.1MHz
5.5
6.0
6.5
dB
Voltage gain
G
C
2
TP4
SG2 : sine wave, 1V
P-P
, 0.1MHz
5.5
6.0
6.5
dB
G
C
3
TP4
SG5 : sine wave, 2V
P-P
, 0.1MHz
-0.5
0
0.5
dB
F
C
1
TP4
SG1 : sweep signal, 1V
P-P
, 10MHz/0.1MHz
-1.0
0
1.0
dB
Frequency characteristic
F
C
2
TP4
SG2 : sweep signal, 1V
P-P
, 10MHz/0.1MHz
-1.0
0
1.0
dB
F
C
3
TP4
SG5 : sweep signal, 2V
P-P
, 10MHz/0.1MHz
-1.0
0
1.0
dB
Differential gain
DG
C
TP5
SG1 : staircase wave, 1V
P-P
APL=10, 50, 90%
-3
0
3
%
Differential phase
DP
C
TP5
SG1 : staircase wave, 1V
P-P
APL=10, 50, 90%
-3
0
3
deg
D
C
1
TP4
SG5 : sine wave, 1kHz, COMP mode
4.2
Input dynamic range
D
C
2
TP4
SG1 : sine wave, 1kHz, TH mode
2.1
V
P-P
D
C
3
TP4
SG2 : sine wave, 1kHz, S mode
2.1
Output offset voltage
V
OFFC
TP4
C
OUT
1 pin DC level difference during switching
0
30
mV
Input impedance
Z
IC
C
IN
10
15
20
k
Output impedance
Z
OC
8
15
22
Electrical Characteristics
(Except where noted otherwise, Ta=25C, V
CC
=8V~13V)
MITSUMI
I
2
C Bus Video Switch MM1250
Item
Symbol
Measurement
Measurement conditions
Min. Typ. Max. Units
circuit
R
OUT
output
Voltage gain
G
R
TP6
sine wave, 2.5V
P-P
, 1kHz
-0.5
0
0.5
dB
Total harmonic distortion
THD
R
TP6
sine wave, 2.5V
P-P
, 1kHz
0.01
0.1
%
Output noise voltage
V
NR
TP6
band 15kHz (except during mute)
3
30
Vrms
Mute noise
V
M
1
TP6
during mute
200
600 Vrms
Input dynamic range
D
R
TP6
SG3 : sine wave, 1kHz, total higher
2.0
Vrms
harmonic distortion rate=0.5%
Output offset voltage
V
OFFR
TP6
R
OUT
pin DC level difference during switching
0
15
mV
Input impedance
Z
IR
1
R
TV
22
30
38
k
Z
IR
2
R
E
1, R
E
2
50
68
86
k
Output impedance
Z
OR
60
80
100
L
OUT
output
Voltage gain
G
L
TP3
sine wave, 2.5V
P-P
, 1kHz
-0.5
0
0.5
dB
Total harmonic distortion
THD
L
TP3
sine wave, 2.5V
P-P
, 1kHz
0.01
0.1
%
Output noise voltage
V
NL
TP3
band 15kHz (except during mute)
3
50
Vrms
Mute noise
V
M
2
TP3
during mute
200
600 Vrms
Input dynamic range
D
L
TP3
SG3 : sine wave, 1kHz, total higher
2.0
Vrms
harmonic distortion rate=0.5%
Output offset voltage
V
OFFL
TP3
Lout pin DC level
0
15
mV
difference during switching
Input impedance
Z
IL
1
L
TV
22
30
38
k
Z
IL
2
L
E
1, L
E
2
50
68
86
k
Output impedance
Z
OL
60
80
100
OUT output
Output voltage L
V
OL
TP10
Bit4=0
0.4
V
Crosstalk
V
OUT
2
CT
V
TP7
4.43MHz
*
1
-70
-60
dB
Y
OUT
CT
Y
TP1
4.43MHz
*
2
-70
-60
dB
C
OUT
CT
C
TP4
4.43MHz
*
3
-70
-60
dB
R
OUT
CT
R
TP6
2.5V
P-P
, 1kHz
-80
-70
dB
L
OUT
CT
L
TP3
2.5V
P-P
, 1kHz
-80
-70
dB
Pin DC voltage
1 pin voltage
Vt1
V
CC
=9.0V, SG1~6=no signal
4.8
5.3
5.8
V
2 pin voltage
Vt2
V
CC
=9.0V, SG1~6=no signal
4.1
4.6
5.1
V
3 pin voltage
Vt3
V
CC
=9.0V, SG1~6=no signal
4.8
5.3
5.8
V
4 pin voltage
Vt4
V
CC
=9.0V, SG1~6=no signal
4.8
5.3
5.8
V
5 pin voltage
Vt5
V
CC
=9.0V, SG1~6=no signal
4.1
4.6
5.1
V
6 pin voltage
Vt6
V
CC
=9.0V, SG1~6=no signal
4.8
5.3
5.8
V
7 pin voltage
Vt7
V
CC
=9.0V, SG1~6=no signal, S4=B
4.1
4.6
5.1
V
8 pin voltage
Vt8
V
CC
=9.0V, SG1~6=no signal
4.8
5.3
5.8
V
9 pin voltage
Vt9
V
CC
=9.0V, SG1~6=no signal
4.1
4.6
5.1
V
10 pin voltage
Vt10
V
CC
=9.0V, SG1~6=no signal
4.8
5.3
5.8
V
11 pin voltage
Vt13
V
CC
=9.0V, SG1~6=no signal, BIT4=0
0.2
0.4
V
12 pin voltage
Vt14
V
CC
=9.0V, SG1~6=no signal
4.1
4.6
5.1
V
13 pin voltage
Vt15
V
CC
=9.0V, SG1~6=no signal
3.5
4.0
4.5
V
14 pin voltage
Vt16
V
CC
=9.0V, SG1~6=no signal
2.1
2.6
3.1
V
15 pin voltage
Vt17
V
CC
=9.0V, SG1~6=no signal
0
V
16 pin voltage
Vt18
V
CC
=9.0V, SG1~6=no signal
4.1
4.6
5.1
V
17 pin voltage
Vt19
V
CC
=9.0V, SG1~6=no signal
9
V
18 pin voltage
Vt20
V
CC
=9.0V, SG1~6=no signal
4.1
4.6
5.1
V
19 pin voltage
Vt21
V
CC
=9.0V, SG1~6=no signal
4.1
4.6
5.1
V
20 pin voltage
Vt22
V
CC
=9.0V, SG1~6=no signal
3.4
3.9
4.4
V
21 pin voltage
Vt23
V
CC
=9.0V, SG1~6=no signal
4.1
4.6
5.1
V
22 pin voltage
Vt24
V
CC
=9.0V, SG1~6=no signal
3.4
3.9
4.4
V
MITSUMI
I
2
C Bus Video Switch MM1250
I
2
C Bus Recommended Operating Conditions
(Refer to diagram below)
Item
Symbol
Measurement conditions
Min. Typ. Max. Units
Input voltage L
V
IL
I
2
C logic low level discrimination value
0.7
V
Input voltage H
V
IH
I
2
C logic high level discrimination value
2.1
5.0
V
Clock frequency
f
SCL
100
kHz
Data transfer wait time
t
BUF
4.7
S
SCL start hold time
t
HD : STA
4.0
S
SCL low level hold time
t
LOW
4.7
S
SCL high level hold time
t
HIGH
4.0
S
SCL start setup time
t
SU : STA
4.7
S
SDA data hold time
t
HD : DAT
5.0
S
SDA data setup time
t
SU : DAT
250
S
SCL rise time
t
R
1000
nS
SCL fall time
t
F
300
nS
SCL stop setup time
t
SU : STO
4.0
S
SDA
SCL
t
BUF
P
P
S t
HD:STA
t
HD:DAT
t
HIGH
t
SU:DAT
t
SU:STA
t
SU:STO
t
LOW
Sr
t
R
t
F
I
2
C Bus control signals
Notes :
*
1
Crosstalk V
OUT
2
Input a 1V
P-P
, 4.43MHz sine wave to SG1.
Given S1=A, S5=A, S6~S10= B, Bit=011 and TP7 amplitude V01,
Combinations below : V02, then C
TV
is obtained as follows:
C
TV
=20log (V02/V01) dB
Signal input
Input
Switch status
Control bit
amplitude
S1
S4
S5
S6
S7
S8
S9
S10
Bit2
Bit1
Bit0
A
A
B
B
B
B
B
-
0
1
A
B
A
B
B
B
B
B
-
A
B
B
B
B
B
-
1
0
SG1
1V
P-P
B
-
B
A
B
B
B
B
-
1
1
-
B
A
B
B
B
B
-
1
0
-
B
B
B
A
B
B
-
1
1
C
A
B
B
B
A
B
B
-
0
1
B
B
B
B
A
B
B
SG6
2V
P-P
-
-
B
B
B
B
B
A
-
1
1
SG5
2V
P-P
-
-
B
B
B
B
A
B
-
1
1
SG2
1V
P-P
-
B
B
B
A
B
B
B
-
0
1
MITSUMI
I
2
C Bus Video Switch MM1250
*
2
Crosstalk Y
OUT
Input a 1V
P-P
, 4.43MHz sine wave to SG1.
Given S1=A, S5=A, S6~S10=B, Bit=111 and TP1 amplitude V03,
Combinations below : V04, then Cty is obtained as follows:
C
TY
=20log (V04/V03) dB
*
3
Crosstalk C
OUT
Input a 1V
P-P
, 4.43MHz sine wave to SG1.
Given S1=A, S5=A, S6~S10=B, Bit=111 and TP5 amplitude V05,
Combinations below : V06, then C
TC
is obtained as follows:
C
TC
=20log (V06/V05) dB
Signal input
Input
Switch status
Control bit
amplitude
S1
S4
S5
S6
S7
S8
S9
S10
Bit2
Bit1
Bit0
SG1
1V
P-P
A
-
A
B
B
B
B
B
0
1
1
SG6
2V
P-P
-
B
B
B
B
B
B
A
0
0
1
-
B
B
B
B
B
A
1
1
1
SG5
2V
P-P
-
-
B
B
B
B
A
B
-
1
1
SG2
1V
P-P
-
-
B
B
A
B
B
B
-
1
1
Signal input
Input
Switch status
Control bit
amplitude
S1
S4
S5
S6
S7
S8
S9
S10
Bit2
Bit1
Bit0
SG1
1V
P-P
A
-
A
B
B
B
B
B
0
1
1
B
B
B
A
B
B
B
B
-
0
1
SG6
2V
P-P
-
-
B
B
B
B
B
A
-
1
1
B
B
B
B
B
B
A
-
0
1
SG5
2V
P-P
-
B
B
B
B
B
A
B
-
0
1
-
B
B
B
B
A
B
1
1
1
SG2
1V
P-P
-
-
B
B
A
B
B
B
-
1
1
MITSUMI
I
2
C Bus Video Switch MM1250
I
2
C Bus
MSB
LSB
MSB
SDA
SCL
S
1
2
3
4
5
6
7
8
ACK
ACK
P
1
2
S:Start Condition
P:Stop Condition
ACK:Acknowledge
The I
2
C bus (Inter IC Bus) is a bus system developed by Philips.
Data is transferred on two lines, SDA and SCL.
Data is transferred in byte units, and MSB is first from start condition.
1. Data format
S
Slave address
R/W
A
Control bits
A
P
1
0
0
1
0
0
1
0
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
Address byte
Control byte
The first 7 bits of the address byte is the salve address, and the last bit is allocated as R/W bit. On
MM1250XD, 92
H
is used for the slave address and 0 (write only) for the R/W bit.
The A at the 9th bit is an acknowledge signal added for verification from slave.
2. Control byte format
Control byte configuration on MM1250XD is allocated as shown in the table below.
Each bit is set at "0" when power is turned on.
Control
Control results
SW1
SW0
MODE1
V
OUT
L
OUT
R
OUT
0
0
TV
V
TV
L
TV
R
TV
0
1
E1
V
E
1
L
E
1
R
E
1
1
0
E2
V
E
2
L
E
2
R
E
2
1
1
TV
V
TV
L
TV
R
TV
Mute
L
OUT
R
OUT
0
SW
L
SW
R
1
Mute
Mute
OUT Pin 13 status
0
Low
1
Open
Control
Control results
MODE1
S4
SW2
Mode2
SW
Y
SW
C
TV
-
0
Comp
Y
IN
C
IN
E1
A
0
Comp
Y
IN
C
IN
B
0
S
V
E
1
S
CIN
E2
-
0
Comp
Y
IN
C
IN
TV
-
1
TH
V
TV
V
TV
E1
A
1
TH
V
E
1
V
E
1
B
1
S
V
E
1
S
CIN
E2
-
1
TH
V
E
2
V
E
2
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
OUT Mute SW2 SW1 SW0
: Don't Care
SW V, L, R control
Audio Mute control
Out Port control
SW Y, C control
MITSUMI
I
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C Bus Video Switch MM1250
Pin Description
Pin no.
Pin name
Internal equivalent circuit diagram
Pin no.
Pin name
Internal equivalent circuit diagram
1
L
TV
3
R
TV
2
V
TV
5
V
E
1
7
SC
IN
9
V
E
2
18
C
IN
20
Y
IN
4
L
E
1
6
R
E
1
8
L
E
2
10
R
E
2
11
SCL
12
SDA
13
OUT
14
V
OUT
1
15
V
IN
16
V
OUT
2
21
R
OUT
23
L
OUT
17
GND
19
V
CC
22
C
OUT
24
Y
OUT
MITSUMI
I
2
C Bus Video Switch MM1250
Measuring Circuit
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