ISSUE 2 - OCTOBER 2000
ZXFBF08
DEVICE DESCRIPTION
The ZXFBF08 is a low cost, high slew rate, octal buffer
amplifier. Built using the Zetex CA700 technology, this
buffer has a small signal bandwidth of greater than
100MHz and a 1 volt pk-pk bandwidth of greater than
20 MHz. Each channel draws only 1.9mA. The device
operates from a 5 volt supply, which makes it ideal in
a majority of applications.
This space saving buffer may be used in a wide variety
of applications such as, video switching matrix,
multi-channel instrumentation equipment, and A/D
input buffer, etc.
FEATURES AND BENEFITS
8 Buffers per package
100MHz bandwidth
Low cost
Low supply current (1.9mA per buffer)
No thermal runaway
20 pin SOIC package
APPLICATIONS
Video Switching Matrix input buffer
Instrumentation
Multi-channel A/D input buffer
Multi-isolation buffer
PART
NUMBER
PACKAGE
PART MARK
ZXFBF08W20
SOIC20W
ZXFBF08
ORDERING INFORMATION
PART NUMBER
CONTAINER
INCREMENT
ZXFBF08W20TC
Reel 13"
1000
RELATED PRODUCTS
ZXFBF04
4 Channel Buffer
ZXFBF05
4 Channel Buffer with high capacitance
drive
ZXFBF25
4 Channel Buffer with output enable
8 Channel Buffer Device
1
5
4
3
2
1
OUT1
IN1
V-
OUT2
IN2
OUT8
IN6
V+
OUT6
6
7
8
OUT3
IN3
V-
OUT4
IN5
IN4
OUT5
9
10
11
12
13
14
15
16
17
18
19
20
IN7
OUT7
V+
IN8
CONNECTION DIAGRAM
ISSUE 2 - OCTOBER 2000
2
ABSOLUTE MAXIMUM RATINGS
Voltage on any pin
20V (relative to V-)
Operating temperature range
0 to 70C (de-rated for -40 to 85C)
Storage Temperature
-55 to 125C
ELECTRICAL CHARACTERISTICS
Test Conditions: Temperature =25C, V+ = 5.00, V- = -5.00V, R
L
= 1k
, C
L
= 10pF
Parameter
Conditions
Min.
Typical
Max.
Units
Offset Voltage
V
in
= 0V
-15
-
15
mV
Offset Voltage Drift
V
in
= 0V
20
V/C
Supply Current
All inputs = 0V
15
25
mA
Input Bias Current
V
in
= 0V
0.1
0.5
2.0
A
Output Voltage
R
L
= 1k
R
L
= 10k
1
4
V
DC Gain
V
in
= 0.5V, R
L
= 1k
V
offset
= 0.0V
0.95
0.98
1.00
V/V
DC Gain
V
in
= 0.5V, R
L
= 1k
V
offset
= 0.25V
0.95
0.99
1.00
V/V
Sink Current
V
in
= 0V, V
out
=0.5V
1.0
2.2
5.0
mA
Source Current
V
in
= 0V, V
out
=-0.5V
6.0
9.0
12.0
mA
Input Resistance
10
20
100
M
Output Resistance
5
10
15
Bandwidth
20mVp-p,
1.0Vp-p
100
20
MHz
Slew Rate
40
V/
s
Voltage Noise
10 100 kHz
15
nV/
Hz
Differential Gain
NTSC
F = 3.58MHz, V
in
= 0.286Vp-p,
DC
V
in
= 0 to 0.714V
0.1
%
Differential Phase
NTSC
0.1
5
Degrees
Differential Gain
PAL
F = 4.43MHz, V
in
= 0.286Vp-p,
DC
V
in
= 0 to 0.714V
0.1
%
Differential Phase
PAL
0.15
Degrees
Channel Isolation
V
in
= 370mVp-p, RL = 1k
F = 4 MHz
-60
dB
NOTES
Test circuit for measuring channel isolation.
Channel Isolation = 20 x LOG
10
(V
out
/ V
in
) dB
Vin=370mV pk-pk,
F = 4 MHz
RL = 1k
V
out
ZXFBF08
ISSUE 2 - OCTOBER 2000
4
APPLICATION CIRCUIT
AC Coupled Configuration
NOTE.
Rs: Source Resistor, provides DC bias for buffer input. Rs
10k
Both 100nF decoupling capacitors should be situated close to device supply pins.
TYPICAL CHARACTERISTICS
0.1
1
10
-100
-90
-80
-70
-60
-50
-40
-50
-25
0
25
50
75
100
0.986
0.987
0.988
0.989
0.990
0.991
Channel Isolation v Frequency
A
tte
n
a
t
i
o
n
(d
B
)
Frequency (MHz)
R
L
= 1k
V+ = 5V
DC Differential Gain v Temperature
D
C
Ga
in
(V
in
/V
ou
t
)
Temperature (C)
C
V-
R
L
+
_
1/8 ZXFBF08
V+
100nF
100nF
R
S
V
out
V
in
ZXFBF08
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