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GX434CDB 데이터시트 PDF




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부품번호 GX434CDB 기능
기능 GX434 Monolithic 4x1 Video Multiplexer
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GX434CDB 데이터시트, 핀배열, 회로
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 pdf, 반도체, 판매, 대치품
TYPICAL PERFORMANCE CURVES OF THE GX434
14
12
10
8
6
4
2
0
-2
-4
-6
1
15 pF
30 pF
50 pF
70 pF
Load Capacitance
10
FREQUENCY (MHz)
100 200
Gain vs Frequency
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
1
Load Capacitance
0 pF
10 pF
27 pF
47 pF
10
FREQUENCY (MHz)
Phase vs Frequency
100
-40
-50
-60
-70
-80
-90
-100
-110
0.1
RIN = 75
RIN = 37.5
RIN = 10
RL = 10 k
1 10
FREQUENCY (MHz)
All Hostile Crosstalk (14 pin DIP)
100
40
50
60
70
80
90
100
110
0.1
RIN = 75
RIN = 75
RIN = 37.5
RIN = 10
SW1 / SW2
SW0 - SW3
RL = 10 k
1 10 100
FREQUENCY (MHz)
All Hostile Crosstalk (16 pin SOIC)
For all graphs, VS = ± 8 V DC and TA = 25°C. The curves shown above represent typical batch sampled results.
510 -34 -2
4

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GX434CDB 전자부품, 판매, 대치품
OPTIMISING THE PERFORMANCE OF THE GX434
1. Power Supply Considerations
Table 1 shows the effect on differential gain (dg) and
differential phase (dp) of various power supply voltages
that may be used. A nominal supply voltage of ± 8
volts result in parameter values as shown in the top
row of the table. By using other power supply voltage
combinations, improvements to these parameters are
possible at the sacrifice of increased chip power
dissipation. Maximum degradation of the differential
gain and phase occurs for the last combination of +12
, -7 volts along with an increase in power dissipation;
these voltages are not recommended.
Supply
Voltage
±8
+8/ -12
± 12
+12/ -7
Differential Gain
%
(Typical)
0.030
0.010
0.010
0.084
Differential Phase
degrees
(Typical)
0.012
0.007
0.007
0.080
Table 2 shows the general characteristic variations
of the GX434 when different combinations of power
supply voltages are used. These changes are rela-
tive to a circuit using ± 8 volts Vcc.
The GX434 does not require input DC biasing to
optimise dg or dp nor does it need switching
transient suppression at the output. Furthermore,
both the analog signal and logic circuits within the
chip use one common power supply, making power
supply configurations relatively simple and straight-
forward. Several of the input characteristic graphs
on pages 4-5 show that for best operation, the input
bias should be 0 volts. The switching transient
photographs on page 6 show how small the actual
transients are and clearly show the make-before-
break action of the GX434 video multiplexer switch.
Supply Voltage
±7
+8/ -12
± 12
+12/ -7
Characteristic Changes
- lower logic thresholds
- max logic I/P (4.5V)
- loss of off isolation (20 dB)
- poorer dg and dp
- slight increase in negative
supply current
- slight decrease in offset
- very similar frequency response
- better dg and dp
- increase in supply current (10%)
- increase in offset (2-4 mV)
- very similar frequency response
- better dg and dp
- loss in off isolation (20 dB)
- poorer dg and dp
7 510 -34 -2

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GX434CDB

GX434 Monolithic 4x1 Video Multiplexer

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