Device Description
The ZXFV201 is a quad, high speed amplifier designed for video and
other high speed applications.
It features low differential gain and phase performance. Together
with high output drive and slew rate capability, this brings high
performance to video applications.
Features and Benefits
Unity gain bandwidth 300MHz
Slew rate 400V/
s
Differential gain 0.01%
Differential phase 0.01
Output current 40mA
Characterized up to 300pF load
5 Volt supply
Supply current 7mA per amplifier.
14 pin SO package
Applications
Video gain stages
CCTV buffer
Video distribution
RGB buffering
xDSL
Home theatre
Fast ADC signal input drive
High frequency instrumentation
Cable driving
Radar imaging
Medical imaging
ZXFV201
ISSUE 1 - FEBRUARY 2002
1
QUAD VIDEO AMPLIFIER
Part Number
Container
Increment
ZXFV201N14TA
reel 7"
500
ZXFV201N14TC
reel 13"
2500
ORDERING INFORMATION
Connection diagram
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V+ to V-
11V differential ( 5.5V)
Inputs to ground*
V+ - 0.5V to V- - 0.5V
Operating Ambient Temperature Range
-40C to 85C
Storage -65C to 150C
Operating Junction Temperature TJMAX**
150C
**The thermal resistance from the semiconductor die to ambient is typically 120 C/W when the SO14 package is
mounted on a PCB in free air. The power dissipation of the device when loaded must be designed to keep the
device junction temperature below TJMAX.
*During power-up and power-down, these voltage ratings require an appropriate sequence of applying and
removing signals and power supplies.
ESD: This device is sensitive to static discharge and proper handling precautions are required.
ZXFV201
ISSUE 1 - FEBRUARY 2002
2
PARAMETER
CONDITIONS
TEST
MIN
TYP
MAX
UNIT
Supply Voltage V+ operating range
4.75
5
5.25
V
Supply Voltage V- operating range
-5.25
-5
-4.75
V
Supply current
P
23
30
35
mA
Input Common mode voltage range
P
3
V
Input offset voltage
P
1
10
mV
Output offset voltage
P
2
20
mV
Input bias current, non-inverting
input
P
5
10
A
Input resistance
P
1.5
2
6.5
M
Open loop gain
P
48
61
dB
Output voltage swing
P
3
V
Output drive current
P
40
mA
Positive PSRR
P
49
57
dB
Negative PSRR
P
51
58
dB
Bandwidth 3dB
Av= +1, Vout = 200mV
pk-pk
C
300
MHz
Bandwidth 0.1dB
Av= +1, Vout = 200mV
pk-pk
C
30
MHz
Slew rate
Av= +1
Av = +2
Av = +10
C
400
400
400
V/ s
Rise time
Vout =
1 V, 10% - 90% C
4.0
ns
Fall time
Vout =
1 V, 10% - 90% C
3.2
ns
Propagation delay
Vout =
2 V, 50%
C
4.0
ns
Differential Gain
3.6MHz(NTSC) and
4.4MHz(PAL), RL = 150
C
0.01
%
Differential phase
3.6MHz(NTSC) and
4.4MHz(PAL), RL = 150
C
0.01
deg
ELECTRICAL CHARACTERISTICS
5V power
supplies
, Tamb= 25C unless otherwise stated. Rf = 1k , RL = 150 , CL<= 10pF
Test P = production tested. C = characterised
ZXFV201
ISSUE 1 - FEBRUARY 2002
3
Figure 2: Pulse Response, Unity Gain, 1V pk-pk, R
F
= 510
Figure 1: Typical Video Signal Application Circuit, Gain = 2 (overall gain = 1 for 75
load)
ZXFV201
ISSUE 1 - FEBRUARY 2002
4
APPLICATIONS INFORMATION
Introduction
A typical circuit application is shown in Figure 1, above.
This is suitable for 75 ohm transmission line
connections at both the input and the output and is
useful for distribution of wide-band signals such as
video and xDSL via cables.
The 75ohms reverse
terminating resistor R4 gives the correct matching
condition to a terminated video cable. The amplifier
load is then 150 ohms in parallel with the local feedback
network.
The wide bandwidth of this device necessitates some
care in the layout of the printed circuit. A continuous
ground plane is required under the device and its
signal connection paths, to provide the shortest
possible ground return paths for signals and power
supply filtering.
A double-sided or multi-layer PCB
construction is required, with plated-through via holes
providing closely spaced low-inductance connections
from some components to the continuous ground
plane.
For the power supply filtering, low inductance surface
mount capacitors are normally required. It has been
found that very good RF decoupling is provided on
each supply using a 1000pF NPO size 0805 or smaller
ceramic surface mount capacitor, closest to the device
pin, with an adjacent 0.1uF X7R capacitor.
Other
configurations are possible and it may be found that a
single 0.01uF X7R capacitor on each supply gives good
results. However this should be supported by larger
decoupling capacitors elsewhere on the printed circuit
board.
Values of 1 to 10 F are recommended,
particularly where the voltage regulators are located
more than a few inches from the device. These larger
capacitors are recommended to be solid tantalum
electrolytic or ceramic types.
Note particularly that the inverting input of this current
feedback type of amplifier is sensitive to small
amounts of capacitance to ground which occur as part
of the practical circuit board layout. This capacitance
affects bandwidth, frequency response peaking and
pulse overshoot.
Therefore to minimise this
capacitance, the feedback components R2 and R3 of
Figure1 should be positioned as close as possible to
the inverting input connection.
The frequency response and pulse response will vary
according to particular values of resistors and layout
capacitance.
The response can be tailored for the
application to some extent by choice of the value of
feedback resistor.
Figure 2 shows an oscilloscope
display of the pulse response for a practical double
sided printed circuit board where RF=510ohms.
ZXFV201
ISSUE 1 - FEBRUARY 2002
5
Figure 3: Graphs of Gain and Phase vs Frequncy (R
L
=150 )
PDF 
ZIP