ZXFV4583EV Diodes Zetex, ZXFV4583EV Datasheet

ZXFV4583EV

Manufacturer Part Number

ZXFV4583EV

Description

BOARD EVAL FOR ZXFV4583/ZXFV4089

Manufacturer

Diodes Zetex

Datasheet

1.ZXFV4583EV.pdf (4 pages)

Specifications of ZXFV4583EV

Main Purpose

Video, Video Processing

Embedded

Utilized Ic / Part

ZXFV4089, ZXFV4583

Primary Attributes

DC Restoration & Sync Separator with Variable Filter

Secondary Attributes

5V Supply, NTSC, PAL, SECAM

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

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SYNC SEPARATOR AND DC RESTORATION AMPLIFIER

EVALUATION BOARD

Evaluation board description

This evaluation board has been developed to allow the

user to quickly evaluate the ZXFV4583 Sync separator

IC and the ZXFV4089 dc restoration video amplifier.

The evaluation board schematic diagram is shown in

Figure 1, and the printed circuit layout is shown in

Figures 2, 3 and 4.

The analog video source is brought onto the board via

a BNC connector socket and is terminated via a 51

resistor. This provides matching to standard

laboratory test instruments. The circuit can be easily

adapted for 75

resistor R1.

The incoming video signal is ac coupled to the

ZXFV4583 via capacitor C1 and is ac coupled to the

ZXFV4089 by capacitor C7.

Header PL2 in conjunction with links LK1 and LK2 allow

the incoming video signal to be passed through the

internal color burst filter or to bypass it.

To use the color burst filter:

Links LK1 should be connected between PL2:1 and PL2:6

Link LK2 should be connected between PL2:4 and PL2:5

To bypass the color burst filter:

Links LK1 should be connected between PL2:2 and PL2:5

Link LK2 should be connected between PL2:3 and PL2:4

Test point TP2 has been provided to monitor the output

of the color burst filter.

Diagrams of this are shown on the PCB itself.

The synchronized logic outputs of the ZXFV4583 are

brought to header H1 for examination using

oscilloscope probes

The ZXFV4089 DC Restoration Amplifier, which is

described in its own datasheet, uses the Back Porch

output from the ZXFV4583 in order to control and

stabilize the black level of a video waveform.

ISSUE 1 - MAY 2004

source impedance by changing

The ZXFV4089 contains an uncommitted current

feedback amplifier. This evaluation board uses

resistors R7 and R8 to set the gain of this amplifier. The

default gain setting of the evaluation board is +2 or

6.02dB.

The output circuit includes a resistor matching circuit

to present a load of 150

simultaneously providing a 50

any test instrument connected to the BNC connector.

The attenuation of this matching circuit is 19.92dB. This

results in an overall gain for a 50

6.02 - 19.92 = -13.9dB.

PCB design

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.

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 0.1 F X7R capacitor. However

larger decoupling capacitors elsewhere on the printed

circuit board, values of 1 to 10 F, are also

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

ZXFV4583EV

to the amplifier while

output impedance to

S E M I C O N D U C T O R S

system of:

Related parts for ZXFV4583EV

ZXFV4583EV Summary of contents

Page 1

... Back Porch output from the ZXFV4583 in order to control and stabilize the black level of a video waveform. ISSUE 1 - MAY 2004 ZXFV4583EV The ZXFV4089 contains an uncommitted current feedback amplifier. This evaluation board uses resistors R7 and R8 to set the gain of this amplifier. The default gain setting of the evaluation board ...

Page 2

... ZXFV4583EV Evaluation board parts list: QTY CCT-REF VALUE DESCRIPTION Resistors, surface mount 1 R1 0805 0805 22k 1 R3 0805 82k 1 R4 0805 681k 2 R5, R12 0805 2.2k 3 R6, R7 0805 1 R9 0805 130 1 R10 0805 33 1 R11 0805 24 Capacitors, surface mount 5 C1, C2, ...

Page 3

... ISSUE 1 - MAY 2004 Figure 1 Circuit schematic 3 ZXFV4583EV ...

Page 4

... ZXFV4583EV Figure 2 Evaluation circuit layout: Top side Figure 4 Evaluation circuit layout: Component layout © Zetex Semiconductors plc 2004 Europe Americas Zetex GmbH Zetex Inc Streitfeldstraße 19 700 Veterans Memorial Hwy D-81673 München Hauppauge, NY 11788 Germany USA Telefon: (49 Telephone: (1) 631 360 2222 ...

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