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GX434CDB Schematic ( PDF Datasheet ) - ETC

Teilenummer GX434CDB
Beschreibung GX434 Monolithic 4x1 Video Multiplexer
Hersteller ETC
Logo ETC Logo 




Gesamt 9 Seiten
GX434CDB Datasheet, Funktion
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
AVAILABLE PACKAGING
14 pin DIP and 16 pin SOIC (wide)
FUNCTIONAL BLOCK DIAGRAM
IN 0 X
IN 1 X
IN 2 X
IN 3 X
OUTPUT
A0
A1
2 TO 4 DECODER
LOGIC
CHIP
SELECT
CS
GX434 Monolithic 4x1
Video Multiplexer
DATA SHEET
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
IN 0 PIN 1
GND
IN 1
GND
IN 2
GND
IN 3 7
14 +8V
AO
A1
CS
O/P
NRC
EXT
8 -8V
TOP VIEW
IN 0 PIN 1
16
GND
IN 1
GND
IN 2
GND
IN 3
NC
8
9
PIN CONNECTION
14 PIN DIP
GX434
PIN CONNECTION
16 PIN SOIC
(wide)
+8V
NC
AO
A1
CS
O/P
NRCEXT
-8V
TRUTH TABLE
CS A1 A0
00 0
00 1
OUTPUT
IN 0
IN 1
01
01
0
1
IN 2
IN 3
1X X
HI - Z
X = DON'T CARE
Document No. 510 - 34 - 2
GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. (905) 632-2996 fax: (905) 632-5946
Japan Branch: A-302 M i yamae Vi l l age, 2–10–42 M i yamae, Suginami–ku, Tokyo 168, Japan tel. (03) 3334-7700 fax (03) 3247-8839






GX434CDB Datasheet, Funktion
10 mV/div
0.1 V/div
0.5 µs/div
Fig.3 Switching Transient (crosspoint to crosspoint)
Chip disabled crosstalk = 20 log
VIN
VOUT
VOUT
ENABLED
VIN CROSSPOINT
37.5
Fig. 5 Chip Disabled Crosstalk Test Circuit
1 µs/div
Fig. 4 Switching Envelope (crosspoint to crosspoint)
All hostile crosstalk = 20 log
RIN
VOUT
VIN
VOUT
VIN
R
L
10
k
Fig. 6 All Hostile Crosstalk Test Circuit
BLANKING LEVEL
10 µH
10 µH
LUMINANCE LEVEL
8V
CONTROL BIT
FROM I/O PORT
R.F. SIGNAL
SOURCE
75
3.9 k
220
RELAY SWITCH
150
0.1µF
AC
COUPLING
150
DUT
R
L CL
BUFFER
AMP
x2
75
75
Fig. 7 Differential Phase and Gain Test Circuit
DIFFERENTIAL GAIN AND PHASE TEST CIRCUIT
The test circuit of Figure 7 allows two DC bias levels, set by
the user, to be superimposed on a high frequency signal
source. A computer controlled relay selects either the preset
blanking or luminance level. One measurement is taken at
each level and the change in gain or phase is calculated.
This procedure is repeated one hundred times to provide a
reasonably large sample.
The results are averaged to reduce the standard deviation
and therefore improve the accuracy of the measurement.
The output from the device under test is AC coupled to a
buffer amplifier which allows the buffer to operate at a
constant luminance level so that it does not contribute any dg
or dp to the measurement.
510 -34 -2
6

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