NJM2277
PRELIMINARY
VIDEO SWITCH MATRIX
sGENERAL
DESCRIPTION
The
NJM2277
is a Video switch for Set Top Box, and TV. The
NJM2277
includes 2 CVBS input, 2-RGB input switches. Also it
allow the inputs to be routed in 3 CVBS output, 1-RGB output.
The
NJM2277
includes 5
th
-order Low pass Filter suppress the
noise interference to video signal.
The
NJM2277
enable to control the Output Impedance for
RGB outputs.
s
PACKAGE OUTLINE
NJM2277G
NJM2277M
sFEATURES
q
Operating Voltage
±5V
q
2- RGB Switches
q
75Ω Cable Driver on all channel
q
41dB Stop Band Rejection (@27Mhz)
q
2-Input,3-output CVBS Switches
q
Quad 5
th
order Butterworth Low Pass Filter
q
High Impedance output for RGB signal
q
Bipolar Technology
q
Package Outline
SDIP28, SDMP30
s
FUNCTION BLOCK DIAGRAM
+Vcc
GND
-VEE
6dB
75Ω
S_Comp Out1
6dB
Comp_Sin
Comp_Vin
FB_Sin
FB_Vin
R_Sin
R_Vin
G_Sin
G_Vin
B_Sin
B_Vin
Switch
Control
Switch
Control
75Ω
75Ω
S_Comp Out2
Filter
2 to 1
Switch
6dB
6dB
TV_Comp Out
2 to 1
Switch
75Ω
75Ω
FB_Out
2 to 1
Switch
Filter
6dB
6dB
Red Out
2 to 1
Switch
2 to 1
Switch
Filter
75Ω
Green Out
Filter
6dB
75Ω
Blue Out
A/B Mux
High Z Cont
-1-
NJM2277
s
Pin Configuration (SDIP28)
Fast Blanking Out
TV Composite Out
Power Supply
STB RED In
Power Supply
VTR RED In
GND
STB BLUE In
Power Supply
1
2
3
FB_out
TV_Comp out
Vcc1
R_Sin
VEE1
R_Vin
GND1
S_Comp Out2
28
STB Composite Video Out2
S_Comp Out1
27
STB Composite Video Out1
High Z Cont
26
RGB Output Control
Comp_Sin
A/B Mux
Comp_Vin
25
4
5
6
7
STB Composite Video In
24
Switch Matrix Control
23
VTR Composite Video In
GND
22
GND
FB_Sin
21
STB Fast Blanking In
8
B_Sin
9
Vcc
B_Vin
VEE
Vcc2
20
Power Supply
FB_Vin
19
VTR BLUE In
10
Power Supply
STB GREEN In
GND
VTR GREEN In
11
VTR Fast Blanking In
VEE2
18
Power Supply
Red Out
Blue Out
17
RED Out
16
12
G_Sin
13
GND2
14
G_Vin
BLUE Out
Green Out
Green Out
15
SDIP28
-2-
NJM2277
s
Pin Configuration (SDMP30)
Fast Blanking Out
TV Composite Out
Power Supply
STB RED In
Power Supply1
VTR RED In
GND
STB BLUE In
Power Supply
VTR BLUE In
Power Supply
No Connect
STB GREEN In
GND
VTR GREEN In
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
FB_out
TV_Comp out
Vcc1
R_Sin
VEE1
R_Vin
GND1
B_Sin
Vcc
B_Vin
VEE
NC
G_Sin
GND2
G_Vin
S_Comp Out2
S_Comp Out1
High Z Cont
Comp_Sin
A/B Mux
Comp_Vin
GND
FB_Sin
Vcc2
FB_Vin
VEE2
NC
Red Out
Blue Out
Green Out
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
STB Composite Video Out1
STB Composite Video Out2
RGB Output Control
STB Composite Video In
Switch Matrix Control
VTR Composite Video In
GND
STB Fast Blanking In
Power Supply
VTR Fast Blanking In
Power Supply
No Connect
RED Out
BLUE Out
Green Out
SDMP30
-3-
NJM2277
s
Pin Description
Symbol
Pin No.
I/O Type
SDIP28 SDMP30
Equivalent Circuit
Function
VCC
FB_out
1
1
O
Fast Blanking
Output
VEE
VCC
TV_Comp out
2
2
O
Composite Video
Signal Output
VEE
Vcc1
3
3
_
_
Vcc
VCC
400Ω
R_Sin
4
4
I
100kΩ
VEE
GND
RGB Signal Input
CVBS/Y/C Signal Input
-4-
NJM2277
Symbol
Pin No.
SDIP28 SDMP30
I/O Type
Equivalent Circuit
Function
VEE1
5
5
_
_
VEE
VCC
400Ω
R_Vin
6
6
I
100kΩ
VEE
GND
RGB Signal Input
CVBS/Y/C Signal Input
GND1
7
7
_
_
0
VCC
400Ω
B_Sin
8
8
I
100kΩ
VEE
GND
RGB Signal Input
CVBS/Y/C Signal Input
-5-
嵌入式系统
