ZXFV202 VIDEO AMPLIIFIER DEVICE DESCRIPTION FEATURES AND BENEFITS The ZXFV202 is a single high speed amplifier designed for video and other high speed applications. Packaged in a small SOT23-5 it is ideally suited to applications where space is at a premium. In applications where cross talk is critical this part provides better isolation than dual or quad devices. • Unity gain bandwidth 300MHz • Slew rate 400V/s • Differential gain 0.01% • Differential phase 0.01° • Output current 40mA I t fe a tu r e s l ow di f f er e nt i a l ga i n a nd p h a se p e r fo r manc e. H i gh out put dri v e c a p a b i l i t y compliments this part for use in video applications. • Characterised up to 400pF load • ±5 Volt supply • Supply current 7mA • Packaged in SOT23-5 or 8 pin SO 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 ORDERING INFORMATION SOT23-5 package PART NUMBER CONTAINER INCREMENT ZXFV202E5TA Reel 7” 3000 ZXFV202E5TC Reel 13” 10000 PART NUMBER CONTAINER INCREMENT ZXFV202N8TA Reel 7” 500 ZXFV202N8TC Reel 13” 2500 SO8 package ISSUE 2 - JUNE 2002 1 ZXFV202 ABSOLUTE MAXIMUM RATINGS Supply Voltage Inputs to ground* Operating Ambient Temperature Range Operating Temperature Range TJMAX** 11V V+ -0.5V to V- -0.5V -40°C to 85°C Storage -65°C to 150°C 150°C **The thermal resistance from the semiconductor die to ambient is typically 195°C/W when the SOT23-5 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. Similarly, the SO8 package thermal resistance is typically 168°C/W. *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. ELECTRICAL CHARACTERISTICS Test Conditions: VCC=⫾5V, Tamb= 25⬚C unless otherwise stated. Rf =1k⍀, RL = 150⍀, CL<= 10pF Parameter Min. Typ. Max. Units Supply Voltage V+ Operating range Conditions Test 4.75 5 5.25 V Supply Voltage VOperating range -5.25 -5 -4.75 V 7 9 Supply current P Input Common mode Voltage range P 5 ⫾3 mA Input offset voltage P 1 10 Output offset voltage P 2 20 mV Input bias current, non inverting input P 5 10 A 6.5 V mV Input Resistance P 1.5 2 Open loop gain P 48 61 dB ⫾3 V Output voltage swing P Output drive current P 40 M⍀ mA Positive PSRR P 49 57 dB Negative PSRR P 51 58 dB Bandwidth Av = +1, V out =200mV pk-pk C 300 MHz Slew rate C C C 400 400 400 V/s Rise time Av = +1, V out =2V pk-pk Av = +2, V out =2V pk-pk Av = +10, V out =2V pk-pk V out = 61 V, 10% - 90% C 4.0 ns Fall time V out = ⫾1V, 10% - 90% C 3.2 ns Propagation delay V out = ⫾2 V, 50% C 4 ns Differential Gain 3.6MHz (NTSC) & 4.4MHz (PAL) C 0.01 % Differential phase 3.6MHz (NTSC) & 4.4MHz (PAL) C 0.01 deg ISSUE 2 - JUNE 2002 2 ZXFV202 Figure 1: Typical Video Signal Application Circuit, Gain = 2(overall gain = 1 for 75⍀ load) Figure 2: Pulse response, Unity gain, 1V pk-pk, Rf = 510⍀ ISSUE 2 - JUNE 2002 3 ZXFV202 APPLICATIONS INFORMATION Introduction Customer Evaluation Circuit A typical circuit application is shown in Figure 1, above. This is suitable for 75⍀ 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 75⍀ reverse terminating resistor R4 gives the correct matching condition to a terminated video cable. The amplifier load is then 150⍀ in parallel with the local feedback network. Figures 4 and 5 show the schematic and copper layout of a double-sided printed circuit board suitable for evaluation of the device in the laboratory. A parts list is provided below. This layout serves as a useful example for many applications, showing the practical implementation of the advice given above in the Introduction. 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 ohms to the amplifier and simultaneously provide 50 ohms 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: The wide bandwidth of this device necessitates some care in the layout of the printed circuit. Partly for this reason, an Evaluation Circuit board is available and is described in a later paragraph. 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 (some of these holes are not visible in the figures for the Evaluation Circuit Board – artworks and NC drill output can be provided if required). 6 - 15.45 = -9.45dB. EVALUATION CIRCUIT PARTS LIST: QTY CCT-REF VALUE DESCRIPTION Resistors, surface mount 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 0.1F 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. 1 R1, 2 R2,R3 51R 0805 1k 0805 1 R4 120R 0805 1 R5 10R 0805 1 R6 62R 0805 Capacitors, surface mount 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. 2 C1,C2 1nF 25V ceramic 0805 X7R 2 C3,C4 100nF 50V ceramic 0805 NPO 2 C5,C6 10F 16V Tant Elec size C Integrated Circuits 1 U1 ᎏ Zetex ZXFV202N8 Miscellaneous 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 of the Evaluation Circuit described below for RF = 510⍀. 2 J1,J2 ᎏ BNC Socket, PCB straight flange, e.g. Tyco B35N14H999X99 1 J3 ᎏ 3-way PCB screw terminal block IMO 20.501/3SB ISSUE 2 - JUNE 2002 4 ZXFV202 0.04 Gain Phase 0.03 Gain (%), Phase (°) Gain (%), Phase (°) 0.04 0.02 0.01 0.00 -0.01 -0.02 -0.03 Gain Phase 0.03 0.02 0.01 0.00 -0.01 -0.02 -0.03 -0.04 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 -0.04 -0.8 -0.6 -0.4 -0.2 0.0 0.8 0.2 0.4 0.6 0.8 DC Bias (V) DC Bias (V) Typical Differential Gain & Phase Vs D.C Offset. PAL, 4.43MHz Typical Differential Gain & Phase Vs D.C Offset NTSC, 3.58MHz) Figure 3: EVALUATION CIRCUIT SCHEMATIC ISSUE 2 - JUNE 2002 5 ZXFV202 Figure 4 EVALUATION CIRCUIT TOP COPPER LAYOUT (overall dimensions 2.5 x 2.25 inches) Figure 5: EVALUATION BOARD BOTTOM COPPER LAYOUT (viewed through from top) ISSUE 2 - JUNE 2002 6 ZXFV202 SOT23-5 PACKAGE INFORMATION SOT23-5 PACKAGE DIMENSIONS MILLIMETRES DIM SO8 PACKAGE OUTLINE MILLIMETRES DIM MIN MAX MIN MAX A 0.90 1.45 E 2.20 3.20 A1 0.00 0.15 E1 1.30 1.80 A2 0.90 1.3 e 0.95 REF b 0.20 0.50 e1 1.90 REF C 0.09 0.26 L 0.10 0.60 D 2.70 3.10 a° 0 30 SO8 PACKAGE DIMENSIONS INCHES DIM INCHES DIM MIN MAX MIN MAX A 0.053 0.069 e A1 0.004 0.010 b 0.013 0.020 D 0.189 0.197 c 0.008 0.010 H 0.228 0.244 ⍜ 08 88 E 0.150 0.157 h 0.010 0.020 L 0.016 0.050 0.050 BSC © Zetex plc 2002 Americas Asia Pacific Zetex GmbH Streitfeldstraße 19 D-81673 München Zetex Inc 700 Veterans Memorial Hwy Hauppauge, NY11788 Germany Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 [email protected] USA Telephone: (631) 360 2222 Fax: (631) 360 8222 [email protected] Zetex (Asia) Ltd 3701-04 Metroplaza, Tower 1 Hing Fong Road Kwai Fong Hong Kong Telephone: (852) 26100 611 Fax: (852) 24250 494 [email protected] Europe Zetex plc Fields New Road Chadderton Oldham, OL9 8NP United Kingdom Telephone (44) 161 622 4422 Fax: (44) 161 622 4420 [email protected] 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 2 - JUNE 2002 7