Japan Branch: A-302 Miyamae Village, 2-10-42 Miyamae, Suginami-ku, Tokyo 168, Japan
tel. (03) 3334-7700
fax: (03) 3247-8839
ABSOLUTE MAXIMUM RATINGS
Parameter
Supply Voltage
Operating Temperature Range
Storage Temperature Range
Value
±
10.0 V
0
°C ≤
T
A
≤
70
°C
-65
°C ≤
T
S
≤
150
°C
Parameter
Lead Temperature
(Soldering, 10 Sec)
Analog Input Voltage
Logic Input Voltage
Value
260
°C
-4 V
≤
V
IN
≤
V
CC
+0.3 V
0 V
≤
V
L
≤
5.5 V
NOTE:
A short from output to ground or either supply will destroy the device.
For R
EXT
use a 2.67 kΩ 1%,
1
/
4
W resistor.
ELECTRICAL CHARACTERISTICS
PARAMETER
Supply Voltage
DC
SUPPLY
Supply Current
not including
I
L
Analog Output
Voltage Swing
STATIC
Analog Input Bias
Current
Output Offset Voltage
V
S
=
±
8 V
DC
, 0°C < T
A
< 70
°C,
R
L
= 2.67 kΩ to V
EE
, C
L
= 30pF
I
L
= 3mA
SYMBOL
±
V
S
I+
Chip selected (CS=0)
Chip not selected (CS=1)
I-
Chip selected (CS=0)
Chip not selected (CS=1)
V
OUT
I
IN
V
OS
t
ON
t
OFF
V
IH
V
IL
I
BIAS
75Ω resistor on each
input to ground
Extremes before
clipping occurs
-
-
-
25
CONDITIONS
MIN
7.5
-
-
-
-
TYP
8.0
14
0.5
13
0.58
MAX
9.5
20
0.85
18
0.88
+5.0
-1.2
-
µA
mV
UNITS
V
mA
mA
mA
mA
V
+5
-30
-70
Turn-On Time
Control input to appearance
of signal at output.
-
250
400
ns
Turn-Off Time
Control input to disappear-
ance of signal at output.
500
750
-
ns
LOGIC
Logic Input
Thresholds
Logic Input
Bias Current
Insertion Loss
1
0
Chip Selected A0,A1 = 1
Chip Selected A0,A1 = 0
2.4
-
-
-
0.05
-
-
-
-
0.08
-
0.6
1
2
0.11
V
V
nA
µA
dB
I.L.
1V p-p sine or sq. wave
at 100 kHz
Bandwidth (-3dB)
Input Resistance
DYNAMIC
B.W.
R
IN
C
IN
Chip selected (CS = 0)
Chip selected (CS = 0)
Chip not selected (CS=1)
65
900
-
-
-
-
-
-
72
90
85
-
2.0
2.2
14
12
-
-
75
100
-
-
-
-
-
-
0.05
0.05
-
-
MHz
kΩ
pF
pF
Ω
pF
%
deg.
dB
dB
Input Capacitance
Output Resistance
Output Capacitance
Differential Gain
Differential Phase
All Hostile Crosstalk
Chip Disabled Crosstalk
R
OUT
C
OUT
dg
dp
X
TALK(AH)
X
TALK(CD)
Chip selected (CS=0)
Chip not selected (CS=1)
at 3.58 MHz
V
IN
= 40 IRE
Sweep on 3 inputs 1V p-p
4th input has 75
Ω
resistor
to gnd. ƒ = 10 MHz
One xpt on output to ground
ƒ = 10 MHz
520 - 5 - 1
2
APPLICATION INFORMATION
The circuit layout of any wideband circuit is critical. Good
high frequency design practice, proper lead dress and
PCB component placement along with a well regulated and
decoupled power supply will assure optimum performance
of the crosspoint.
The GX214A is non-inverting. The inputs are buffered and
require 75Ω line terminating resistors when driven from 75Ω
cable. The inputs may be driven directly from an amplifier
which has low output impedance.
The output of the GX214A must be buffered to drive 7
Ω
lines. The addition of an amplifier/buffer also allows adjustments
to be made to the gain, offset and frequency response of
the circuit.
Signal Ground (SG) pins 2, 4 and 6 must be joined together
and preferably form part of a ground plane. The Signal
Ground must also be connected to the
±
8V power supply
ground. The potential of the Logic Ground (LG) pin 9 can
deviate from the Signal Ground by
±0.5V
maximum. Alternatively,
the signal and logic grounds can be joined together at one
point only.
An external load current of 2 to 8mA should be supplied
from each output bus to negative supply. For most applications
a load resistor of 2.67kΩ, 1% is recommended to minimize
offset drift with temperature. In order to improve differential
phase and tighten the insertion loss tolerance, an external
constant current active load may be substituted for the
load resistor. Note however, that since only one GX214A
output drives the output bus at any one time, only one
external load is needed for the bus.
A typical application is shown below. Two GX214A ICs are
paralleled to form an 8x1 crosspoint matrix. The three
address lines make use of the A0, A1 and CS inputs. If more
than two devices are used in parallel, a decoder is necessary
in order to generate the extra address inputs.
Depending on the application and the speed of the logic
family used, latches may be required for synchronization
where timing delays are critical. The active switching
circuitry of the GX214A ensures low crosstalk and high per-
formance over an input voltage range of -1.2 to +5.0 volts.
INPUTS
VIDEO SWITCHES
0.1
+8V
1
V0
2
3
V1
4
5
V2
6
7
V3
75
75
75
75
IN 0
SG
IN 1
SG
IN 2
SG
IN 3
0.1
+V
14
13
A0
A 1 ADDRESS
A2
A0
12
A1
CS
OUT
LG
-V
11
10
9
8
-8V
+8V
0.1
V4
1 IN 0
2
SG
IN 1
SG
IN 2
SG
IN 3
0.1
+V
14
GAIN, OFFSET, FREQUENCY
RESPONSE ADJUSTMENTS
V5
3
4
V6
5
6
V7
75
75
7
13
A0
A 1 12
11
CS
10
OUT
9
LG
-V 8
V
75
2.67 K
OUT
AMPLIFIER/BUFFER
75
75
-8V
All resistors in ohms, all capacitors
in microfarads, unless otherwise stated
Fig. 1 8x1 Video Multiplexer Incorporating Two GX214A Devices
3
520 - 5 - 1
TYPICAL PERFORMANCE CURVES FOR GX214A
V
S
=
±
8V, C
L
= 30pF, I
L
= 3mA unless otherwise shown
5
4
3
2
0.0
-0.5
-1.0
-1.5
GAIN (dB)
PHASE (deg)
1
0
-1
-2
-3
-4
-5
1
1
10
100
100
-2.0
-2.5
-3.0
-3.5
-4.0
-4.5
-5.0
1
1
3
5
10
10
FREQUENCY (MHz)
FREQUENCY (MHz)
Fig. 2 Gain vs Frequency
Fig. 3 Phase vs Frequency
-20
-30
-40
0.05
0.04
V =40
IRE
0.03
IN
-60
-70
-80
-90
-100
-110
-120
1
dg(%) dp(
o
)
-50
GAIN (dB)
XTALK (AH)
R
S
=75Ω
0.02
0.01
0.00
-0.01
-0.02
-0.03
dg
IN 1,2
IN 0,3
OFF ISOLATION
R
L
=15Ω
dp
-0.04
10
100
-0.05
1
1
3
5
10
10
FREQUENCY (MHz)
FREQUENCY (MHz)
Fig. 4 All - Hostile Crosstalk & Off-Isolation vs Frequency
Fig. 5 Differential Gain & Phasevs Frequency
+5V
FROM
NETWORK
ANALYSER
1
2
IN0
AG
75
A0
A1
CS
OUT
LG
8
13
12
11
10
9
0.1
1
4 CLC110
2.67k
-8V
-5V
5
0.1
8
TO
NETWORK
ANALYSER
V
CC
V
EE
14
+8V
*
*
* The power supply pins should be suitably decoupled with at least 0.1µF, high quality capacitors
All resistors in ohms, all capacitors in microfarads unless otherwise stated.
Fig. 6 Test Circuit
The TEST SET UP shown is for INPUT 0 tests. Similar circuitry is used for each input INPUT in order to test
FREQUENCY RESPONSE and PHASE DELAY. For OFF-ISOLATION, all switches are disabled (CHIP SELECT
= logic 1) and a second enabled GX214A is connected to the output bus. For ALL-HOSTILE CROSSTALK,
three OFF switches are driven from the generator and the fourth is terminated with a 75Ω resistor. For the
DIFFERENTIAL GAIN and PHASE tests, the output is AC coupled to the output amplifier and the input level
from the generator is modulated with a step signal varying between 0 volts DC and 0.714 volts DC.
520 - 5 - 1
4
CAUTION
ELECTROSTATIC
SENSITIVE DEVICES
DO NOT OPEN PACKAGES OR HANDLE
EXCEPT AT A STATIC-FREE WORKSTATION
DOCUMENT
IDENTIFICATION
PRODUCT PROPOSAL
This data has been compiled for market investigation purposes
only, and does not constitute an offer for sale.
ADVANCE INFORMATION NOTE
This product is in development phase and specifications are
subject to change without notice. Gennum reserves the right to
remove the product at any time. Listing the product does not
constitute an offer for sale.
PRELIMINARY DATA SHEET
The product is in a preproduction phase and specifications are
subject to change without notice.
REVISION NOTES
.
Block diagram added,new test circuit, revised electrical
characteristics, new application circuit, all new response graphs.
DATA SHEET
The product is in production. Gennum reserves the right to make
changes at any time to improve reliability, function or design, in
order to provide the best product possible.
Gennum Corporation assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement.
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