MITSUMI
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C BUS Controlled 5-Input 2-Output AV Switch MM1492AF
I
2
C BUS Controlled 5-Input 2-Output AV Switch
Monolithic IC MM1492AF
Outline
This IC is a 5-input 2-output AV switch controlled by the I
2
C BUS developed for use in television. Because
there are 2 outputs, it supports 2 screens and P-IN-P, and also supports an external output (monitor) pin.
Features
(1) Serial control by I
2
C BUS
(2) 5 inputs, 2 outputs
(3) 1 Y/C (S pin) inputs, 2 outputs
(4) The video and audio switches can be controlled independently
(5) Built-in 6dB amp for video
(6) Built-in Y/C (S pin) mix circuit
(7) One of the two audio outputs has a built-in -6dB ON/OFF switch
(8) Slave address can be changed. 90H and 92H possible.
(9) Audio muting from external pin possible
(10) Maintains high impedance even when I
2
C BUS line (SDA, SCL) power supply is off.
(11) Built-in 3 value discrimination function built-in
(12) Built-in power ON reset function
(13) Supports 2 screens and P-IN-P. Also supports external output (monitor) pin.
Package
SOP-44B
Applications
(1) TV
(2) Other video equipment
MITSUMI
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C BUS Controlled 5-Input 2-Output AV Switch MM1492AF
Block Diagram
MITSUMI
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2
C BUS Controlled 5-Input 2-Output AV Switch MM1492AF
Pin Assignment
SOP-44B
1
3
6
9
2
4 5
8
7
10 11
44
40
37
43
41
39 38
36
42
34
12
33
13
32
14
31
15
30
16
29
17
28
18
27
19
26
20
25
21
24
22
23
35
1
V1-V
12
S2
23
V
OUT
2
34
Y
IN
1
2
V1-L
13
V3-V
24
R
OUT
2
35
R
OUT
1
3
V1-Y
14
V3-L
25
C
OUT
2
36
L
OUT
1
4
V1-R
15
V3-R
26
L
OUT
2
37
V
OUT
1
5
V1-C
16
STV-V
27
Y
OUT
2
38
BIAS
6
S1
17
STV-L
28
GND
39
Y
OUT
1
7
V2-V
18
STV-R
29
SDA
40
V
CC
8
V2-L
19
Y
IN
2
30
SCL
41
C
OUT
1
9
V2-Y
20
ADR
31
MUTE
42
MTV-R
10
V2-R
21
C
IN
2
32
C
IN
1
43
MTV-V
11
V2-C
22
GND
33
GND
44
MTV-L
Pin No. Pin name
Functions
Internal equivalet circuit diagram
1
V1-V
Video input terminal
3
V1-Y
(Composite or Y)
7
V2-V
*
Sync chip clamp
9
V2-Y
13
V3-V
16
STV-V
19
Y
IN
2
34
Y
IN
1
43
MTV-V
2
V1-L
Audio input terminal
4
V1-R
8
V2-L
10
V2-R
14
V3-L
15
V3-R
17
STV-L
18
STV-R
42
MTV-R
44
MTV-L
Pin Description
MITSUMI
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C BUS Controlled 5-Input 2-Output AV Switch MM1492AF
Pin No. Pin name
Functions
Internal equivalet circuit diagram
5
V1-C
Video input terminal
11
V2-C
(Croma)
21
C
IN
2
32
C
IN
1
6
S1
Distinction 3-effects input terminal
12
S2
DC Detect
20
ADR
Sleve address select
31
Mute
Audio Mute terminal
22
GND
GND
28
33
23
V
OUT
2
Composite video out
37
V
OUT
1
24
R
OUT
2
Audio out terminal
26
L
OUT
2
35
R
OUT
1
36
L
OUT
1
25
C
OUT
2
S -Video out terminal
27
Y
OUT
2
39
Y
OUT
1
41
C
OUT
1
MITSUMI
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C BUS Controlled 5-Input 2-Output AV Switch MM1492AF
Pin No. Pin name
Functions
Internal equivalet circuit diagram
29
SDA
Data input from I
2
C
30
SCL
CLK input from I
2
C
38
BIAS
Internal bias terminal
40
V
CC
V
CC
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
max.
12
V
Allowable loss
Pd
1100
mW
Recommended Operating Conditions
Item
Symbol
Ratings
Units
Operating temperature
T
OPR
-20~+75
C
Operating voltage
V
OP
+8~+10
V
MITSUMI
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C BUS Controlled 5-Input 2-Output AV Switch MM1492AF
Electrical Characteristics
(Except where noted otherwise, V
CC
=9V, Ta=25C)
Item
Symbol
Measurement conditions
Min. Typ. Max. Units
Current consumption
I
CC
No signal
39
55
71
mA
V
OUT
1
Voltage gain
G
V1
SIN wave : 1V
P-P
100kHz
5.5
6.0
6.5
dB
Frequency characteristics
f
V1
SIN wave : 1V
P-P
10MHz/100kHz
-1.0
0.0
1.0
dB
Differential gain
DG
V1
Staircase signal 1V
P-P
-3
0
3
%
Differential phase
DP
V1
Staircase signal 1V
P-P
-3
0
3
deg
Input dynamic ranges
D
V1
SIN wave : 100kHz THD=1.0%
1.4
1.5
V
P-P
V
OUT
2
Voltage gain
G
V2
SIN wave : 1V
P-P
100kHz
5.5
6.0
6.5
dB
Frequency characteristics
f
V2
SIN wave : 1V
P-P
10MHz/100kHz
-1.0
0.0
1.0
dB
Differential gain
DG
V2
Staircase signal 1V
P-P
-3
0
3
%
Differential phase
DP
V2
Staircase signal 1V
P-P
-3
0
3
deg
Input dynamic range
D
V2
SIN wave : 100kHz THD=1.0%
1.4
1.5
V
P-P
Y
OUT
1
Voltage gain
G
Y1
Vn-Y : SIN wave 1V
P-P
100kHz
5.5
6.0
6.5
dB
G
Y2
Y
IN
1 : SIN wave 2V
P-P
100kHz
-0.5
0.0
0.5
dB
Frequency characteristics
f
Y1
Vn-Y : SIN wave 1V
P-P
-1.0
0.0
1.0
dB
f
Y2
Y
IN
1 : SIN wave 2V
P-P
-1.0
0.0
1.0
dB
Differential gain
DG
Y1
Vn-Y : Staircase signal 1V
P-P
-3
0
3
%
Y
IN
1 : Staircase signal 2V
P-P
-3
0
3
%
Differential phase
DP
Y1
Vn-Y : Staircase signal 1V
P-P
-3
0
3
deg
Y
IN
1 : Staircase signal 2V
P-P
-3
0
3
deg
Input dynamic range
D
Y1
Vn-Y : SIN wave 100kHz THD=1.0%
1.4
1.5
V
P-P
D
Y2
Y
IN
1 : SIN wave 100kHz THD=1.0%
3.2
3.8
V
P-P
Output impedance
Z
OY1
(50)
Y
OUT
2
Voltage gain
G
Y3
Vn-Y : SIN wave 1V
P-P
100kHz
5.5
6.0
6.5
dB
G
Y4
Y
IN
2 : SIN wave 2V
P-P
100kHz
-0.5
0.0
0.5
dB
Frequency characteristics
f
Y3
Vn-Y : SIN wave 1V
P-P
-1.0
0.0
1.0
dB
f
Y4
Y
IN
2 : SIN wave 2V
P-P
-1.0
0.0
1.0
dB
Differential gain
DG
Y2
Vn-Y : Staircase signal 1V
P-P
-3
0
3
%
Y
IN
2 : Staircase signal 2V
P-P
-3
0
3
%
Differential phase
DP
Y2
Vn-Y : Staircase signal 1V
P-P
-3
0
3
deg
Y
IN
2 : Staircase signal 2V
P-P
-3
0
3
deg
Input dynamic range
D
Y3
Vn-Y : SIN wave 100kHz THD=1.0%
1.4
1.5
V
P-P
D
Y4
Y
IN
2 : SIN wave 100kHz THD=1.0%
3.2
3.8
V
P-P
Output impedance
Z
OY2
(50)
C
OUT
1
Voltage gain
G
C1
Vn-C : SIN wave 1V
P-P
100kHz
5.5
6.0
6.5
dB
G
C2
C
IN
1 : SIN wave 2V
P-P
100kHz
-0.5
0.0
0.5
dB
Frequency characteristics
f
C1
Vn-C : SIN wave 1V
P-P
-1.0
0.0
1.0
dB
f
C2
C
IN
1 : SIN wave 2V
P-P
-1.0
0.0
1.0
dB
Differential gain
DG
C1
C
IN
1 : Staircase signal 2V
P-P
-3
0
3
%
Differential phase
DP
C1
C
IN
1 : Staircase signal 2V
P-P
-3
0
3
deg
Input dynamic range
D
C1
Vn-Y : SIN wave 100kHz THD=1.0%
2.75
3.25
V
P-P
D
C2
Y
IN
1 : SIN wave 100kHz THD=1.0%
5.5
6.5
V
P-P
Input impedance
Z
IC1
Vn-C and C
IN
1
10
15
20
k
Output impedance
Z
OC1
(50)
MITSUMI
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C BUS Controlled 5-Input 2-Output AV Switch MM1492AF
Item
Symbol
Measurement conditions
Min. Typ. Max. Units
C
OUT
2
Voltage gain
G
C3
Vn-C : SIN wave 1V
P-P
100kHz
5.5
6.0
6.5
dB
G
C4
C
IN
2 : SIN wave 2V
P-P
100kHz
-0.5
0.0
0.5
dB
Frequency characteristics
f
C3
Vn-C : SIN wave 1V
P-P
-1.0
0.0
1.0
dB
f
C4
C
IN
2 : SIN wave 2V
P-P
-1.0
0.0
1.0
dB
Differential gain
DG
C2
C
IN
1 : Staircase signal 2V
P-P
-3
0
3
%
Differential phase
DP
C2
C
IN
2 : Staircase signal 2V
P-P
-3
0
3
deg
Input dynamic range
D
C3
Vn-Y : SIN wave 100kHz THD=1.0%
2.75
3.25
V
P-P
D
C4
Y
IN
2 : SIN wave 100kHz THD=1.0%
5.5
6.5
V
P-P
Input impedance
Z
IC2
C
IN
2
10
15
20
k
Output impedance
Z
OC2
(50)
L
OUT
1
Voltage gain
G
L1
SIN wave 2.5V
P-P
1kHz -6dB Select
-6.5
-6.0
-5.5
dB
G
L2
SIN wave 2.5V
P-P
1kHz 0dB Select
-0.5
0.0
0.5
dB
Frequency characteristics
f
L1
SIN wave 2.5V
P-P
1MHz/1kHz
-3.0
0.0
1.0
dB
Total harmonic distortion
THD
L1
SIN wave 2.5V
P-P
1kHz
0.03
0.1
%
Input dynamic range
D
L1
SIN wave 1kHz THD<0.5%
2.6
2.8
Vrms
Output offset voltage
V
OFFL1
DC offset at the switching time
0
15
mV
Input impedance
Z
IL1
42
60
78
k
Output impedance
Z
OL1
(120)
L
OUT
2
Voltage gain
G
L3
SIN wave 2.5V
P-P
1kHz -6dB Select
-6.5
-6.0
-5.5
dB
G
L4
SIN wave 2.5V
P-P
1kHz 0dB Select
-0.5
0.0
0.5
dB
Frequency characteristics
f
L2
SIN wave 2.5V
P-P
1MHz/1kHz
-3.0
0.0
1.0
dB
Total harmonic distortion
THD
L2
SIN wave 2.5V
P-P
1kHz
0.03
0.1
%
Input dynamic range
D
L2
SIN wave 1kHz THD<0.5%
2.6
2.8
Vrms
Output offset voltage
VOFF
L2
DC offset at the switching time
0
15
mV
Output impedance
Z
OL2
(120)
R
OUT
1
Voltage gain
G
R1
SIN wave 2.5V
P-P
1kHz -6dB Select
-6.5
-6.0
-5.5
dB
G
R2
SIN wave 2.5V
P-P
1kHz 0dB Select
-0.5
0.0
0.5
dB
Frequency characteristic
f
R1
SIN wave 2.5V
P-P
1MHz/1kHz
-3.0
0.0
1.0
dB
Total harmonic distortion
THD
R1
SIN wave 2.5V
P-P
1kHz
0.03
0.1
%
Input dynamic range
D
R1
SIN wave 1kHz THD<0.5%
2.6
2.8
Vrms
Output offset voltage
V
OFFR1
DC offset at the switching time
0
15
mV
Input impedance
Z
IR1
42
60
78
k
Output impedance
Z
OR1
(120)
R
OUT
2
Voltage gain
G
R3
SIN wave 2.5V
P-P
1kHz -6dB Select
-6.5
-6.0
-5.5
dB
G
R4
SIN wave 2.5V
P-P
1kHz 0dB Select
-0.5
0.0
0.5
dB
Frequency characteristics
f
R2
SIN wave 2.5V
P-P
1MHz/1kHz
-3.0
0.0
1.0
dB
Total harmonic distortion
THD
R2
SIN wave 2.5V
P-P
1kHz
0.03
0.1
%
Input dynamic range
D
R2
SIN wave 1kHz THD<0.5%
2.6
2.8
Vrms
Output offset voltage
V
OFFR2
DC offset at the switching time
0
15
mV
Output impedance
Z
OR2
(120)
MITSUMI
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C BUS Controlled 5-Input 2-Output AV Switch MM1492AF
Item
Symbol
Measurement conditions
Min. Typ. Max. Units
Crosstalk (
*
1)
V
OUT
1
CT
V1
SG1 : 4.43MHz 1V
P-P
(At mix, SG2/3 input)
-60
-53
dB
V
OUT
2
CT
V2
SG1 : 4.43MHz 1V
P-P
(At mix, SG2/3 input)
-60
-53
dB
Y
OUT
1
CT
Y1
SG2 : 4.43MHz 1V
P-P
-60
-53
dB
Y
OUT
2
CT
Y2
SG2 : 4.43MHz 1V
P-P
-60
-53
dB
C
OUT
1
CT
C1
SG3 : 4.43MHz 1V
P-P
-60
-53
dB
C
OUT
2
CT
C2
SG3 : 4.43MHz 1V
P-P
-60
-53
dB
L
OUT
1
CT
L1
1kHz 2.5V
P-P
-90
-80
dB
L
OUT
2
CT
L2
1kHz 2.5V
P-P
-90
-80
dB
R
OUT
1
CT
R1
1kHz 2.5V
P-P
-90
-80
dB
R
OUT
2
CT
R2
1kHz 2.5V
P-P
-90
-80
dB
Terminal voltage
Video input terminal
V
VIP
No signal, No load
4.6
4.9
5.2
V
V
OUT
1/2 terminal
V
VOP
No signal, No load
3.9
4.2
4.5
V
Y
OUT
1/2 terminal
V
YOP
No signal, No load
3.2
3.5
3.8
V
C
OUT
1/2 terminal
V
COP
No signal, No load
3.2
3.5
3.8
V
Audio input terminal
V
AIP
No signal, No load
4.0
4.3
4.6
V
Audio output terminal
V
AOP
No signal, No load
3.9
4.2
4.5
V
I
2
C condition (Refer to figure below)
Input voltage L
V
IL
0.0
1.5
V
Input voltage H
V
IH
3.0
5.0
V
Low level output voltage
V
OL
SDA sink 3mA
0.0
0.4
V
High level input current
I
IH
SDA, SCL=4.5V
-10
10
V
Low level input current
I
IL
SDA, SCL=0.4V
-10
10
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
200
nS
SDA data setup time
t
SU : DAT
250
nS
SCL rise-time
t
R
1000
nS
SCL fall-time
t
F
300
nS
SCL stop setup time
t
SU : STO
4.0
S
(The inside of parentheses is design guarantee value.)
SDA
SCL
P
S
Sr
P
t
HD:STA
t
LOW
t
HD:DAT
t
R
t
F
t
HIGH
t
SU:DAT
t
SU:STA
t
SU:STO
t
BUR
I
2
C condition
MITSUMI
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C BUS Controlled 5-Input 2-Output AV Switch MM1492AF
(Note.1) : Input signal symbol
Vn-V=MTV-V, V1-V, V2-V,V3-V, STV-V
Vn-Y=V1-Y, V2-Y
Vn-C=V1-C, V2-C
(Note.2) :
*
1 Test Circuit of Crosstalk
See Test Circuit 2
(Note.3) : Video inputs
Vn-V, Vn-Y, and Y
IN
n inputs are sync chip clamped, while Vn-C and C
IN
n inputs are non-clamped.
Measuring Circuit
Measuring Circuit 1
MITSUMI
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C BUS Controlled 5-Input 2-Output AV Switch MM1492AF
Measuring Circuit 2 (Crosstalk measurement)
MITSUMI
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2
C BUS Controlled 5-Input 2-Output AV Switch MM1492AF
I
2
C BUS
SDA
SCL
S:Start Condition
P:Stop Condition
A:Acknowledge
S
3
8
A
2
1
A
8
7
6
5
4
3
2
1
P
I
2
C BUS is inter bus system controled by 2 lines (SDA, SCL).
Data are transmitted and received in the units of byte and Acknowledge.
It is transmitted by MSB first from the Start conditions.
[Control registers]
Control registers are data sent from the master for determining the switch conditions.
The data format is set as shown in the following figure.
Out of the Address byte, first 7bit are assigned to the slave address, while the residual 1bit is assigned to the
R/W bit.
Set the R/W bit to 0 when data are used control registers.
As MM1492 slave address, either 90H or 92H can be selected according to the ADR terminal conditions.
When ADR terminal is L, 90H is selected.
The following figure indicates the control contents of control registers and switches.
Each bit of control registers is reset to 0, when power-on.
Register
b7
b6
b5
b4
b3
b2
b1
b0
1
Audio Gain 1
S/Comp select 1
Video out1 select
Audio out1 select
2
Audio Gain 2
S/Comp select 2
Video out2 select
Audio out2 select
MM1492 consists of one address byte and two control data bytes (3bytes in total).
All data over the limited length (4th and subsequent bytes) are fully neglected.
For details of the control contents of switches, refer to the separate table.
A
Control register 1
b7 b6 b5 b4 b3 b2 b1 b0
A
Control register 2
A
P
b7 b6 b5 b4 b3 b2 b1 b0
S
Slave address
R/W
1
0
0
1
0
0 0/1 0
Address byte
Control data
MITSUMI
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C BUS Controlled 5-Input 2-Output AV Switch MM1492AF
[Status registers]
Status registers are data to inform the device status.
The data format is set as shown in the following figure.
S
Slave address
R/W
A
Status register
NA
P
1
0
0
1
0
0
0/1
1
b7
b6
b5
b4
b3
b2
b1
b0
Address byte
device status
Out of the Address byte, first 7bit are assigned to the slave address, while the residual 1bit is assigned to the
R/W bit.
Set the R/W bit to 1 when data are used status registers.
As MM1492 slave address, either 91H or 93H can be selected according to the ADR terminal conditions.
When ADR terminal is L, 91H is selected.
Set the confirmation acknowledgement after the end of status register to non-acknowledgement.
The following figure shows the correspondence of the output data of status registers.
b7
b6
b5
b4
b3
b2
b1
b0
P-ON
S1
S1
S2
S2
RESET
OPEN
SEL
OPEN
SEL
P-on RESET : 1 returns when the power on reset is done, 0 returns after reading data once.
S1/S2 OPEN : S1/S2 OPEN and SEL are identified by 3 values, and output according to the
S1/S2 SEL combinations in the following table.
DC voltage of S1/S2
S1/S2 OPEN
S1/S2 SEL
0.8V<
=DC
0
1
1.3V<
=DC<
=3.5V
0
0
DC<
=4.5V
1
0
[about power on reset]
MM1492 is provided with a power on reset function to reset each control register to 0 when power supply is
turned on.
The power on reset threshold has the hysteresis as shown in following figure.
Reset
off
Reset
on
4.3V
5.4V
V
CC
MITSUMI
I
2
C BUS Controlled 5-Input 2-Output AV Switch MM1492AF
Switch Control Table
(1) Video output 1
b6
b5
b4
b3
V
OUT
1
Y
OUT
1
C
OUT
1
0
0
0
0
Mute
Mute
Mute
0
0
0
1
MTV-V
Y
IN
1
C
IN
1
0
0
1
0
V1-V
Y
IN
1
C
IN
1
0
0
1
1
V2-V
Y
IN
1
C
IN
1
0
1
0
0
V3-V
Y
IN
1
C
IN
1
0
1
0
1
STV-V
Y
IN
1
C
IN
1
0
1
1
0
Mute
Mute
Mute
0
1
1
1
1
0
0
0
Mute
Mute
Mute
1
0
0
1
MTV-V
Y
IN
1
C
IN
1
1
0
1
0
V1-(Y+C)
V1-Y
V1-C
1
0
1
1
V2-(Y+C)
V2-Y
V2-C
1
1
0
0
V3-V
Y
IN
1
C
IN
1
1
1
0
1
STV-V
Y
IN
1
C
IN
1
1
1
1
0
Mute
Mute
Mute
1
1
1
1
(2) Audio output 1
Mute terminal
b2
b1
b0
L
OUT
1
R
OUT
1
0
0
0
Mute
Mute
0
0
1
MTV-L
MTV-R
0
1
0
V1-L
V1-R
<
=1.5V (OPEN)
0
1
1
V2-L
V2-R
1
0
0
V3-L
V3-R
1
0
1
STV-L
STV-R
1
1
0
Mute
Mute
1
1
1
>
=3.0V
Mute
Mute
(3) Audio gain
b7
L
OUT
1
R
OUT
1
0
-6dB
-6dB
1
0dB
0dB
MITSUMI
I
2
C BUS Controlled 5-Input 2-Output AV Switch MM1492AF
Application Circuit
Note.
(1) V
OUT
is set to 4.2V, While C
IN
is set to 4.9V.
Be careful since the capacity polarity may differ according to the comb filter bias.
(2) Each audio output can be set to myte by setting pin 31 to high. The mute is turned off in when pin 19 is
open or low.
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