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VCA820IDR Datasheet(PDF) 1 Page - Texas Instruments |
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VCA820IDR Datasheet(HTML) 1 Page - Texas Instruments |
1 / 37 page VCA820 VCA820 R F +V IN R G+ R G- -VIN FB R G R S R S 20W V IN+ V IN- VCA820 95 90 40 Frequency(Hz) 100k 100M 85 45 75 80 10M 1M 50 55 60 65 70 Input-Referred VCA820 www.ti.com............................................................................................................................................ SBOS395C – OCTOBER 2007 – REVISED OCTOBER 2009 Wideband, > 40dB Adjust Range, Linear in dB VARIABLE GAIN AMPLIFIER Check for Samples: VCA820 1 FEATURES DESCRIPTION 23 • 150MHz SMALL-SIGNAL BANDWIDTH The VCA820 is a dc-coupled, wideband, linear in dB, • 137MHz, 5VPP BANDWIDTH (G = +10V/V) continuously variable, voltage-controlled gain • 0.1dB GAIN FLATNESS to 28MHz amplifier. It provides a differential input to • 1700V/ μs SLEW RATE single-ended conversion with a high-impedance gain control input used to vary the gain down 40dB from • > 40dB GAIN ADJUST RANGE the nominal maximum gain set by the gain resistor • HIGH GAIN ACCURACY: 20dB ±0.4dB (RG) and feedback resistor (RF). • HIGH OUTPUT CURRENT: 160mA The VCA820 internal architecture consists of two input buffers and an output current feedback amplifier APPLICATIONS stage integrated with a multiplier core to provide a • AGC RECEIVERS with RSSI complete variable gain amplifier (VGA) system that • DIFFERENTIAL LINE RECEIVERS does not require external buffering. The maximum gain is set externally with two resistors, providing • PULSE AMPLITUDE COMPENSATION flexibility in designs. The maximum gain is intended • VARIABLE ATTENUATORS to be set between +2V/V and +100V/V. Operating • DROP-IN UPGRADE TO LMH6502 from ±5V supplies, the gain control voltage for the VCA820 adjusts the gain linearly in dB as the control voltage varies from 0V to +2V. For example, set for a maximum gain of +10V/V, the VCA820 provides 20dB, at +2V input, to –20dB at 0V input of gain control range. The VCA820 offers excellent gain linearity. For a 20dB maximum gain, and a gain-control input voltage varying between 1V and 2V, the gain does not deviate by more than ±0.4dB (maximum at +25°C). Figure 1. Differential Equalizer VCA820 RELATED PRODUCTS GAIN ADJUST INPUT SIGNAL RANGE NOISE BANDWIDTH SINGLES DUALS (dB) (nV/ √Hz) (MHz) VCA810 — 80 2.4 35 — VCA2612 45 1.25 80 — VCA2613 45 1 80 — VCA2615 52 0.8 50 — VCA2617 48 4.1 50 VCA820 — 40 8.2 150 VCA821 — 40 7.0 420 VCA822 — 40 8.2 150 VCA824 — 40 7.0 420 Figure 2. Common-Mode Rejection Ratio 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 X2Y is a trademark of X2Y Corporation. 3 All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2007–2009, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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