NJM2249
3 – INPUT VIDEO SWITCH
■
GENERAL DESCRIPTION
The
NJM2249
is 3-input video switch for video and audio signal.
One input terminals has sink-chip clamp function and so it is applied to
fixed DC level of video signal. Two other input terminals are transistor
base input for luminant signal and so luminant level may be easily
fixed by outer circuit. Its operating supply voltage range is 4.75 to 13V
and bandwidth is 10MHz. Cross-talk is 70dB (at 4.43MHz).
■
FEATURES
●
Operating Voltage (V
+
= +4.75V to +13V)
●
3 Input - 1 Output
●
Internal Clamp Function (V
IN
1)
●
Internal Luminance Signal Control Function (V
IN
2, V
IN
3)
●
Cross - talk 70dB (at 4.43MHz)
●
Wide Frequency Range
●
Package Outline DIP8, DMP8, SIP8, SSOP8
●
Bipolar Technology
■
APPLICATION
●
VCR, Video Camera, AV-TV, Video Disc Player
■
PIN CONFIGURATION
■
PACKAGE OUTLINE
NJM2249D
NJM2249M
NJM2249V
NJM2249L
NJM2249L
NJM2249D
NJM2249M
NJM2249V
■
BLOCK DIAGRAM
■
INPUT CONTROL SIGNAL-OUTPUT SIGNAL
SW1
L
H
L/H
SW2
L
L
H
OUTPUT SIGNAL
V
IN
1
V
IN
2
V
IN
3
Ver.2004-02-17
-1-
NJM2249
■
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Power Dissipation
SYMBOL
V
+
(T
a
= 25°C)
RATINGS
15
(DIP8)
(DMP8)
(SIP8)
500
300
800
UNIT
V
mW
mW
mW
mW
°C
°C
P
D
(SSOP8) 250
Operating Temperature Range
Storage Temperature Range
T
opr
T
stg
-20 to +75
-40 to +125
■
ELECTRICAL CHARACTERISTICS
PARAMETERS
Recommended Supply Voltage
Operating Current
Voltage Gain
Frequency Characteristics
Differential Gain
Differential Phase
Cross-talk
Switch Change Voltage
Output Impedance
SYMBOLS
V
+
(V
+
= 5V, T
a
= 25°C)
TEST CONDITIONS
S1 = S2 = S3 = S4 = S5 = 1
V
1
= 2.5V
P-P
, 100kHz, V
O
/ V
1
V
1
= 2.0V
P-P
, V
O
(10MHz) / V
O
(100MHz)
V
1
= 2V
P-P
, Staircase signal
V
1
= 2V
P-P
, Staircase signal
V
1
= 2.0V
P-P
, 4.43MHz, V
O
/ V
1
(Note 1)
All inside SW : ON
All inside SW : OFF
MIN.
4.75
-
-0.5
-1.0
-
-
-
2.4
-
-
TYP.
-
10.5
-
0
0
0
-70
-
-
10
MAX.
13.0
13.0
+0.5
+1.0
-
-
-
-
0.8
-
UNIT
V
mA
dB
dB
%
deg
dB
V
V
Ω
I
CC
G
V
G
f
DG
DP
CT
V
CH
V
CL
R
O
(Note 1) : Tested on all combination except three below.
a) S1 = 2, S4 = S5 = 1 b) S2 = 2, S4 = 2, S5 = 1 c) S3 = 2, S5 = 2
(Note 2) : Unless specified, tested with V
BIAS
1 = V
BIAS
2 = 3V.
(Note 3) : If it is not shown about switch condition, it is tested on three condition below.
a) S1 = 2, S2 = S3 = S4 = S5 = 1 b) S1 = 1, S2 = 2, S3 = 1, S4 = 2, S5 = 1 c) S1 = S2 = 1, S3 = 2, S4 = 1 or 2, S5 = 2
+
(Note 4) : V
IN
1 clamp voltage is about 2 / 5 of supply voltage (about 2.0V if V = 5V).
■
TEST CIRCUIT
■
SPECIAL CARES TO BE TAKEN WHEN APPLICATION
Oscillation Prevention on light loading conditions
Recommended under circuit.
-2-
Ver.2004-02-17
NJM2249
■
TERMINAL FUNCTION
PIN NO.
PIN SYMBOL
EQUIVALENT CIRCUIT
PIN NO.
PIN SYMBOL
EQUIVALENT CIRCUIT
1
V
IN
1
5
V
IN
3
2
SW1
6
V
+
3
V
IN
2
7
V
OUT
4
SW2
8
GND
Ver.2004-02-17
-3-
NJM2249
■
APPLICATION
This IC requires 1MΩ resistance between INPUT and GND pin for clamp type input since the minute current causes an
unstable pin voltage.
This IC requires 0.1uF capacitor between INPUT and GND, 1MΩ resistance between INPUT and GND for clamp type
input at mute mode.
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including
the industrial rights.
-4-
Ver.2004-02-17
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