ZXFV201EV

ZXFV203EV ZXFV201EV TRIPLE AND QUAD CHANNEL VIDEO AMPLIFIER EVALUATION BOARD Evaluation board description Power supply filtering 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. 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 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 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. 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 instruments via 50⍀ cables. The output circuit includes 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. A parts list is provided below. Evaluation board parts list QTY Cct Ref 1 Resistors, surface 3 (1) /4 R1 (2) R5 R12 R22 6 (1) /8 R2 (2) R3 (2) R6 R7 R9 R10 R15 R16 3 (1) /4 R4 (2) R8 R11 R21 R13 R18 (2) 3 (1) /4 R19 R23 R14 R17 (2) 3 (1) /4 R20 R24 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 closely spaced low-inductance connections from some 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). Value Description Printed circuit board ZDB189 mount 51R Resistor chip 470R Resistor chip 130R Resistor chip 33R Resistor chip 24R Resistor chip Capacitors, surface mount 2 C1,C2 100nF 2 C3,C4 - C5-C8 Integrated circuits 1 U1 Miscellaneous 8 J1-J8 1 J9 2.2µF Capacitor ceramic chip X7R Capacitor ceramic chip X7R NOT FITTED ZXFV201 (3) /ZXFV203 (1) Socket BNC, PCB square flange Terminal block, 3 way NOTES: (1) Applies to ZXFV203EV only (2) Not present on ZXFV203EV (3) Applies to ZXFV201EV only ISSUE 1 - MARCH 2004 1 SEMICONDUCTORS SEMICONDUCTORS J5 V- GND J1 J9:1 J9:2 J9:3 2 51R R12 9 10 51R R1 2 3 VCC 8 U1:C V EE ZXFV201 V EE VCC 4 11 V+ 470R R10 470R R9 2.2UF C4 100NF C2 ZXFV201 1 U1:A 100NF C7 R2 130R 24R R14 33R R13 C5 J7 51R R22 13 12 ZXFV201EV/ZXFV203EV schematic J6 33R R18 24R 130R Figure 1 R1 1 470R R3 470R R17 R4 51R 6 C1 R5 5 J2 J3 2.2UF C3 ZXFV201 14 U1:D ZXFV201 7 U1:B 470R R16 470R R15 470R R7 470R R6 C8 C6 130R R21 130R R8 33R R23 24R R24 33R R19 24R R20 J8 J4 ZXFV203EV ZXFV201EV ISSUE 1 - MARCH 2004 ZXFV203EV ZXFV201EV TOP VIEW ZETEX O UT A O UT D ZDB189 IND IN A INC IN B EVALUATION BOARD FOR TRIPLE & QUAD AMPLIFIERS OUT B Figure 2 OUT C ZXFV201E/ZXFV203EV silkscreen T OP VIEW Figure 3 ZXFV201EV/ZXFV203EV top copper ISSUE 1 - MARCH 2004 3 SEMICONDUCTORS ZXFV203EV ZXFV201EV T OP VIEW Figure 4 ZXFV201EV/ZXFV203EV bottom copper © Zetex plc 2004 Europe Americas Asia Pacific Corporate Headquaters Zetex GmbH Streitfeldstraße 19 D-81673 München Germany Zetex Inc 700 Veterans Memorial Hwy Hauppauge, NY 11788 USA Zetex (Asia) Ltd 3701-04 Metroplaza Tower 1 Hing Fong Road, Kwai Fong Hong Kong Zetex plc Fields New Road, Chadderton Oldham, OL9 8NP United Kingdom Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 europe.sales@zetex.com Telephone: (1) 631 360 2222 Fax: (1) 631 360 8222 usa.sales@zetex.com Telephone: (852) 26100 611 Fax: (852) 24250 494 asia.sales@zetex.com 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. This publication is issued to provide outline information only which (unless agreed by the Company in writing) may not be used, applied or reproduced 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 ISSUE 1 - MARCH 2004 SEMICONDUCTORS 4