GX434 Monolithic 4x1
Video Multiplexer
DATA SHEET
FEATURES
•
low differential gain: 0.03% typ. at 4.43 MHz
•
low differential phase: 0.012 deg. typ. at 4.43 MHz
•
low insertion loss: 0.05 dB max at 100 kHz
•
low disabled power consumption: 5.2 mW typ.
•
high off isolation: 110 dB at 10 MHz
•
all hostile crosstalk @ 5 MHz, 97 dB typ.
•
bandwidth (-3dB) with 30 pF load, 100 MHz typ.
•
fast make-before-break switching: 200 ns typ.
•
TTL and 5 volt CMOS compatible logic inputs
•
low cost 14 pin DIP and16 pin SOIC packages
•
optimised performance for NTSC, PAL and SECAM
applications
APPLICATIONS
Glitch free analog switching for...
• High quality video routing
• A/D input multiplexing
• Sample and hold circuits
• TV/ CATV/ monitor switching
IN 0
GND
IN 1
GND
IN 2
CIRCUIT DESCRIPTION
The GX434 is a high performance low cost monolithic 4x1
video multiplexer incorporating four bipolar switches with a
common output, a 2 to 4 address decoder and fast chip select
circuitry. The chip select input allows for multi-chip paralleled
operation in routing matrix applications. The chip is selected
by applying a logic 0 on the chip select input.
Unlike devices using MOS bilateral switching elements, these
bipolar circuits represent fully buffered, unilateral transmission
paths when selected. This results in extremely high output to
input isolation. They also feature fast make-before-break
switching action. These features eliminate such problems as
switching 'glitches' and output-to-input signal feedthrough.
The GX434 operates from
±
7 to
±
13.2 volt DC supplies. They
are specifically designed for video signal switching which
requires extremely low differential phase and gain. Logic
inputs are TTL and 5 volt CMOS compatible providing address
and chip select functions. When the chip is not selected, the
output goes to a high impedance state.
PIN CONNECTIONS
TOP VIEW
PIN 1
14
+8V
TOP VIEW
AO
A1
CS
O/P
NC
R
EXT
7
8
-8V
IN 0
GND
IN 1
GND
IN 2
PIN 1
16
+8V
NC
AO
A1
CS
O/P
NC
R
8
9
-8V
EXT
AVAILABLE PACKAGING
14 pin DIP and 16 pin SOIC (wide)
GND
IN 3
GND
IN 3
NC
FUNCTIONAL BLOCK DIAGRAM
PIN CONNECTION
14 PIN DIP
PIN CONNECTION
16 PIN SOIC
GX434
IN 0
IN 1
IN 2
IN 3
(wide)
X
TRUTH TABLE
X
X
X
OUTPUT
CS
0
0
0
A1
0
0
1
1
X
A0
0
1
0
1
X
OUTPUT
IN 0
IN 1
IN 2
IN 3
HI - Z
A0
A1
2 TO 4 DECODER
LOGIC
CHIP
SELECT
CS
0
1
X = DON'T CARE
Document No. 510 - 34 - 2
GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3
Japan Branch: A-302 M i yamae Vi l l age, 2–10–42 M i yamae, Suginami–ku, Tokyo 168, Japan
tel. (905) 632-2996 fax: (905) 632-5946
tel. (03) 3334-7700
fax (03) 3247-8839
ABSOLUTE MAXIMUM RATINGS
ORDERING INFORMATION
Value & Units
±13.5V
0°C
≤
T
A
≤
70
°
C
-65°C
≤
T
S
≤
150
°
C
260
°
C
-4V
≤
V
IN
≤
+2.4V
Parameter
Supply Voltage
Operating Temperature Range
Storage Temperature Range
Part Number
GX434 – – CDB
GX434 – – CKC
GX434 – – CTC
Package Type
14 Pin DIP
16 Pin SOIC
Tape 16 Pin SOIC
Temperature Range
0° to 70° C
0° to 70° C
0° to 70° C
Lead Temperature (Soldering, 10 Sec)
Analog Input Voltage
Analog Input Current
Logic Input Voltage
50µA AVG, 10 mA peak
-4V
≤
V
L
≤
+5.5V
CAUTION
ELECTROSTATIC SENSITIVE DEVICES
DO NOT OPEN PACKAGES OR HANDLE
DEVICES EXCEPT AT A
STATIC-FREE WORKSTATION
+Vcc
CS
0.7pF
IN
V
IN
OUT
1.2k
CS
CS
3mA
#2
#3
#4
-V
1.5pF
2pF
+
0.7pF
0.7pF
0.7pF
V
OUT
0.65V
Common
C
OUT
12pF
16pF
+
1.3 V
600Ω
Fig.1
Crosspoint Equivalent Circuit
Fig. 2
Disabled Crosspoint Equivalent Circuit
ELECTRICAL CHARACTERISTICS
(V
S
=
±8V
DC, 0
°
C < T
A
< 70
°
C, C
L
= 30 pF, R
L
= 10kΩ unless otherwise shown.)
GX434
PARAMETER
Supply Voltage
DC
SUPPLY
Supply current
I
-
SYMBOL
±
V
S
I
+
Chip selected (CS=0)
Chip not selected (CS=1)
Chip selected (CS=0)
Chip not selected (CS=1)
Analog Output
V
OUT
I
BIAS
Extremes before clipping
occurs.
Analog Input Bias
Current
STATIC
Output Offset Voltage
V
OS
T
A
= 25°C, 75
Ω
resistor
on each input to gnd
Output Offset Voltage
Drift
R
EXT
= 33.2 kΩ, 1%
∆
V
OS
/∆T
0
-
7
+50
14
+200
mV
µV/
°
C
CONDITIONS
MIN
7
-
-
-
-
-
-
-
TYP
8
10.5
0.4
10.2
0.25
+2
-1.2
22
-
MAX
13.2
11.5
0.58
11.2
0.38
-
V
µA
UNITS
V
mA
mA
mA
mA
510 -34 -2
2
ELECTRICAL CHARACTERISTICS continued
(VS =
±
8V DC, 0°C < TA < 70°C,CL = 30pF, RL = 10kΩ unless otherwise shown.)
GX434
PARAMETER
Crosspoint Selection
Turn-On Time
Crosspoint Selection
Turn-Off Time
Chip Selection
Turn-On Time
Chip Selection
Turn-Off Time
LOGIC
Logic Input
Thresholds
SYMBOL
CONDITIONS
Control input to appearance
of signal at the output.
Control input to disappear-
ance of signal at output.
Control input to appearance
of signal at output.
Control input to disappear-
ance of signal at output.
1
0
Chip selected A0,A1 = 1
Chip selected A0,A1 = 0
MIN
130
TYP
200
MAX
270
UNITS
ns
t
ADR-ON
t
ADR-OFF
t
CS-ON
t
CS-OFF
V
IH
VIL
390
600
800
ns
200
300
400
ns
460
700
940
ns
2.0
-
-
-
-
-
0.025
100
-
-0.04
-
-
-
-
-
-
0.03
120
-
-
1.1
5.0
0.1
1.0
30
0.04
-
+0.06
V
V
µA
nA
nA
µA
dB
MHz
dB
Address Input
Bias Current
Chip Select Bias
Current
Insertion Loss
Bandwidth (-3 dB)
Gain Spread at 8 MHz
I
BIAS(ADR)
I
BIAS(CS)
CS = 1
CS = 0
I.L.
B.W.
1V p-p sine or sq. wave at
100 kHz
Input to Output Signal
Delay Matching
(chip to chip)
∆
t
P
T = 25°C, R = 75Ω
A
S
ƒ= 3.579545 MHz
0°C < T < 70°C, R as
A
S
above, ƒas above.
-
-
-
-
±
0.15
±
0.3
degrees
degrees
Input Resistance
DYNAMIC
Input Capacitance
R
IN
C
IN
Chip selected (CS = 0)
Chip selected (CS = 0)
Chip not selected (CS = 1)
900
-
-
-
-
-
-
2.0
2.4
14
15
0.03
0.012
-
-
-
-
-
0.05
0.025
kΩ
pF
pF
Ω
pF
%
degrees
Output Resistance
Output Capacitance
Differential Gain
Differential Phase
All Hostile Crosstalk
(see graph)
R
OUT
C
OUT
dg
dp
X
TALK (AH)
Chip selected (CS = 0)
Chip not selected (CS = 1)
at 3.579545 MHz
V
IN
= 40 IRE, (Fig. 7)
Sweep on 3 inputs 1V p-p
4th input has 10
Ω
resistor to
gnd. ƒ = 5 MHz (Fig. 6)
-
94
97
-
dB
Chip Disabled Crosstalk
(see graph)
X
TALK(CD)
ƒ = 10 MHz (Fig. 5)
+SR
V = 3V p-p (C = 0 pF)
IN
L
100
110
-
dB
360
160
450
200
-
-
V/µs
V/µs
Slew Rate
-SR
R
EXT
= 33.2kΩ, 1%
3
510 -34 -2
Electronics Design Contest
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