SEMICONDUCTORS
Evaluation board description
The wide bandwidth of the ZXFV201/3 quad/triple
channel video amplifiers necessitates some care in the
layout of the printed circuit. For this reason Zetex has
made available an Evaluation Board.
The evaluation board layout serves as a useful
example for many applications, showing a practical
implementation of the advice given below.
Figures 1, 2, 3 and 4 show the schematic and copper
layout of a double-sided printed circuit board suitable
for evaluation of the device in the laboratory.
BNC connector sockets allow connection to test
instrumentsvia50⍀cables.Theoutputcircuitincludes
a resistor matching circuit to present a load of 150⍀to
the amplifier (equivalent to a 75⍀back-terminated
video line) and simultaneously provide a 50⍀output
impedance.
The attenuation of this matching circuit is 15.45 dB. As
the amplifier is configured for a voltage gain of 2, the
overall gain is:
6 - 15.45 = -9.45dB
PCB design
A continuous ground plane is required under the
device (except around its inverting input) 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
closelyspacedlow-inductanceconnectionsfromsome
components to the continuous ground plane (some of
these holes are not visible in the figures for the
Evaluation Board - artworks and NC drill output can be
provided if required).
Power supply filtering
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 0.1µF X7R capacitor. Other
configurations are possible and it may be found that a
single0.01uFX7Rcapacitor on each supplygivesgood
results. However this should be supported by larger
decoupling capacitors elsewhere on the printed circuit
board. Values of 1 to 10 µF 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.
A parts list is provided below.
ZXFV203EV
ZXFV201EV
ISSUE 1 - MARCH 2004
TRIPLE AND QUAD CHANNEL VIDEO AMPLIFIER EVALUATION BOARD
1
QTY Cct Ref Value Description
1 Printed circuit board ZDB189
Resistors, surface mount
3(1)/4 R1(2) R5
R12 R22 51R Resistor chip
6(1)/8 R2(2) R3(2)
R6 R7 R9
R10 R15
R16
470R Resistor chip
3(1)/4 R4(2) R8
R11 R21 130R Resistor chip
3(1)/4 R13 R18(2)
R19 R23 33R Resistor chip
3(1)/4 R14 R17(2)
R20 R24 24R Resistor chip
Capacitors, surface mount
2 C1,C2 100nF Capacitor ceramic
chip X7R
2 C3,C4 2.2µF Capacitor ceramic
chip X7R
- C5-C8 NOT FITTED
Integrated circuits
1 U1 ZXFV201(3)/ZXFV203(1)
Miscellaneous
8 J1-J8 Socket BNC, PCB square
flange
1 J9 Terminal block, 3 way
NOTES:
(1) Applies to ZXFV203EV only
(2) Not present on ZXFV203EV
(3) Applies to ZXFV201EV only
Evaluation board parts list
ZXFV203EV
ZXFV201EV
SEMICONDUCTORS
ISSUE 1 - MARCH 2004
2
5
67
U1:B
ZXFV201
VCC
VEE
C2
100NF
C1
100NF
R8
130R
C6
3
2
411
1
U1:A
ZXFV201
R1
51R
R4
130R
C5
J1 J2
J3 J4
R17
24R
R18
33R
R19
33R
R20
24R
10
98
U1:C
ZXFV201
R1 1
130R
C7
J5 J6
R13
33R
R14
24R
12
13 14
U1:D
ZXFV201
R21
130R
C8
J7 J8
R23
33R
R24
24R
J9:3
J9:2
J9:1
VCC
VEE
V+
GND
V-
C3
2.2UF
C4
2.2UF
R12
51R
R22
51R
R5
51R
R2
470R
R3
470R
R9
470R
R10
470R
R15
470R
R16
470R
R7
470R
R6
470R
Figure 1 ZXFV201EV/ZXFV203EV schematic
ZXFV203EV
ZXFV201EV
SEMICONDUCTORS
ISSUE 1 - MARCH 2004
3
ZETEX
ZDB189
INAINB
INC IND
OUTA
OUT B OUT C
OUTD
EVALUATION BOARD
FOR TRIPLE & QUAD
AMPLIFIERS
TOP VIEW
Figure 2 ZXFV201E/ZXFV203EV silkscreen
TOP VIEW
Figure 3 ZXFV201EV/ZXFV203EV top copper
ZXFV203EV
ZXFV201EV
SEMICONDUCTORS
ISSUE 1 - MARCH 2004
Europe
Zetex GmbH
Streitfeldstraße 19
D-81673 München
Germany
Telefon: (49) 89 45 49 49 0
Fax: (49) 89 45 49 49 49
europe.sales@zetex.com
Americas
Zetex Inc
700 Veterans Memorial Hwy
Hauppauge, NY 11788
USA
Telephone: (1) 631 360 2222
Fax: (1) 631 360 8222
usa.sales@zetex.com
Asia Pacific
Zetex (Asia) Ltd
3701-04 Metroplaza Tower 1
Hing Fong Road, Kwai Fong
Hong Kong
Telephone: (852) 26100 611
Fax: (852) 24250 494
asia.sales@zetex.com
Corporate Headquaters
Zetex plc
Fields New Road, Chadderton
Oldham, OL9 8NP
United Kingdom
Telephone (44) 161 622 4444
Fax: (44) 161 622 4446
hq@zetex.com
These offices are supported by agents and distributors in major countries world-wide.
Thispublicationisissued toprovide outlineinformation onlywhich (unlessagreed bythe Companyin writing)may notbe used,applied orreproduced
for any purpose or form part of any order or contract or be regarded as a representation relating to the products or services concerned. The Company
reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service.
For the latest product information, log on to www.zetex.com
© Zetex plc 2004
4
TOP VIEW
Figure 4 ZXFV201EV/ZXFV203EV bottom copper
