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
Lead Temperature (soldering 10 sec.)
Analog Input Voltage
Logic Input Voltage
VALUE
±7.5
V
0°C to 70°C
-65°C to 150°C
260°C
-5.5 V
≤
V
IN
≤
5.5 V
-0.5 V
≤
V
L
≤
5.5 V
CAUTION
ELECTROSTATIC
SENSITIVE DEVICES
DO NOT OPEN PACKAGES OR HANDLE
EXCEPT AT A STATIC-FREE WORKSTATION
ELECTRICAL CHARACTERISTICS
PARAMETER
Supply Voltage
Supply Current
DC
SUPPLY
V
S
=
±5
V, T
A
= 0° to 70°C, R
L
= 10kΩ, C
L
= 47 pF, R-SET = open circuit unless otherwise shown.
SYMBOL
V
S
I
+
I
-
I
+
I
-
I
+ (off)
I
- (off)
CONDITIONS
MIN.
±4.5
-
-
TYP.
±5.0
30
30
16
16
0
16
-
12
-
50
100
1
-
-
-
-0.04
100
120
3.0
1.1
2
5
0.02
0.02
80
250
MAX.
±5.5
37
37
20
20
-
50
2.2
-
15
100
-
-
-
0.8
5.0
-
-
-
-
-
-
-
-
-
-
-
UNITS
V
mA
mA
mA
mA
µA
µA
V
µA
mV
µV/°C
ns
µs
V
V
µ
A
dB
MHz
MHz
M
Ω
pF
Ω
pF
%
deg
dB
V/µs
R-SET = 0
Ω
R-SET = 0
Ω
Enable = 0
Enable = 0
Unclipped Extremes
-
-
-
-
-1.8
-
Analog Output Voltage
STATIC
Analog Input Bias Current
Output Offset Voltage
Output Offset Voltage Drift
Chip Enable Time
Chip Disable Time
LOGIC
Logic Input Thresholds
V
OUT
IV
BIAS
V
OS
∆V
OS
t
ON
t
OFF
V
IH
T
A
= 25°C
-5
-
-
-
2.0
-
V
IL
Enable Bias Current
Insertion Loss
Frequency Response (±0.1dB)
Full Power (-3dB)
Input Resistance
Input Capacitance
DYNAMIC
Output Resistance
Output Capacitance
Differential Gain
Differential Phase
Off Isolation at 30 MHz
+SR
I
BIAS
I.L.
F.R.
FPBW
R
IN
C
IN
R
OUT
C
OUT
Enable = 0, T
A
= 25°C
ƒ = 100 kHz, T
A
= 25°C
V
IN
= 1 V p-p C
L
= 27 pF
V
IN
= 1 V p-p,
-
-
-
-
1.0
-
-
-
dg
dp
ƒ = 3.58 MHz
ƒ = 3.58 MHz
V
IN
= 1 V p-p
R-SET = 0 (I minimum)
V
IN
= 3 V p-p, C
L
= 100 pF
-
-
75
-
Slew Rate
-SR
+SR
-SR
R
S
= 12
Ω
V
IN
= 3 V p-p, C
L
= 100 pF
R
S
= 12
Ω
-
-
-
100
350
170
-
-
-
V/µs
V/µs
V/µs
520 - 40 - 4
2
+5V
0.1
TALLY OUT
GX4201
10K
TALLY OUT
VIDEO OUT
3
VIDEO INPUT
7
8
GB4600
2
1
27
4
5
TALLY OUT
CL
GX4201
VIDEO OUT
GX4201
VIDEO OUT
75
*
R-SET
0.1
-5V
-5V
All resistors are in ohms, all capacitors in microfarads unless otherwise stated
*
The current will be maximum if the pin 5 is left open circuit. Any value of resistance from pin 5 to -V
EE
will reduce the current. The minimum current
(50% of max.) will occur when R-SET = 0
Ω.
TYPICAL APPLICATION CIRCUIT
The circuit shown above uses the GB4600 as an input
buffer driving several GX4201 video crosspoint ICs.
The GB4600 is capable of driving loads up to 100 pF to
a -3 dB bandwidth of 80 MHz. For lighter loads, the
bandwidth is extended to over 100 MHz.
Capacitor C
L
is used to shape the response in conjunction
with the 27
Ω
series resistor from pin 4. The value shown
will give a -1 dB response at 100 MHz with a total load
capacitance (fixed plus actual) of 47 pF.
In order to disable the GB4600, pin 1 is driven from the
TALLY outputs of the GX4201s. When all crosspoints are
OFF, the voltage on pin 1 will be 0 volts, disabling the
GB4600. Whenever any crosspoint is selected, the
voltage on pin 1 rises to +5 volts and turns on the buffer.
This configuration minimizes the current drain when a
group of crosspoints are turned off.
+5V
For other applications, the ENABLE input on the GB4600
may be controlled by any TTL or 5 volt CMOS device.
A unique feature of the GB4600 is that its current drain
can be reduced by adjusting the value of the resistor on
the
I-SET
input, pin 5.
If R-SET is made zero ohms (a direct connection to -V
EE
)
then the supply current drops 50% from 36 mA to 18 mA.
A reduced current will reduce the bandwidth as shown
in Figure 3. For values of R
S
= 27
Ω
and C
L
= 47 pF, the
-1 dB bandwidth shrinks from 100 MHz at maximum
current to 80 MHz at minimum current.
As with any high frequency circuit, careful board layout
with ample ground plane is critical.
CHIP ENABLE
+5V
10 K
0.1
1
4
CL
0.1
R
L
10 K
COMLINEAR
CLC110
0.1
3
VIDEO INPUT
7
8
75
0.1
-5V
GB4600
2
1
RS
4
5
8
VIDEO OUT
(75
Ω
)
5
0.1
-5V
Max. Min.
I-SET
-5V
All resistors are in ohms, all capacitors in microfarads unless otherwise stated
TEST CIRCUIT
3
520 - 40 - 4
TYPICAL PERFORMANCE CURVES FOR THE GB4600
40
1.5
1.0
50
V
IN
= 1V p-p
0.5
0
OFF ISOLATION (dB)
I
SET
= MAX.
60
GAIN (dB)
-0.5
-1.0
-1.5
-2.0
-2.5
70
80
R
S
= 27Ω
C
L
= 47pF
V
IN
= 1V p-p
10
10
I
SET
= MIN.
90
-3.0
100
-3.5
1
10
100
300
100
200
200
FREQUENCY (MH
Z
)
FREQUENCY (MHz)
Fig. 1
1.5
1.0
0.5
0
Off - Isolation vs Frequency
0.05
Fig. 3
I-SET
Bandwidth vs Frequency
R
S
= 12Ω
0.04
V
BLANKING
= 0V
V
LUMINENCE
= 0.714V
V
IN
= 40 IRE
0.03
GAIN (d B)
-0.5
-1.0
-1.5
-2.0
-2.5
-3.0
-3.5
1
1
10
100
100
R
S
= 18Ω
C
L
= 100pF
V
IN
= 1V p-p
dg/dp
dg
0.02
dp
0.01
0
1
3
5
10
FREQUENCY (MHz)
FREQUENCY (MHz)
Fig. 2
Full Power Bandwidth (100 pF) vs Frequency
Fig. 4
Differential Gain and Phase vs Frequency
80
75
70
AMBIENT TEMPERATURE ( C)
o
V
S
=
±5.0V
(STILL AIR)
65
60
55
50
45
40
100
1K
10K
1M
V
S
=
±5.3V
V
S
=
±5.5V
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.
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.
R-SET (Ω)
Fig. 5
SOIC Derating Curves
REVISION NOTES:
Upgraded to Data Sheet
Gennum Corporation assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement.
