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VCA822IDGST Datasheet(PDF) 1 Page - Texas Instruments |
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VCA822IDGST Datasheet(HTML) 1 Page - Texas Instruments |
1 / 35 page BurrBrown Products from Texas Instruments VCA822 VCA822 1 FEATURES DESCRIPTION APPLICATIONS R F +V IN R G+ R G- -VIN FB R S 20W V IN1 VCA822 R G R 1 C 1 R S V IN2 R L C L V OUT 9 6 -24 Frequency(Hz) 1M 1G 3 -21 -3 0 100M 10M -18 -15 -12 -9 -6 InitialFrequencyResponse ofVCA822withRCLoad EqualizedFrequency Response R =75 C =100pF W L F VCA822 SBOS343A – SEPTEMBER 2007 – REVISED OCTOBER 2007 Wideband, > 40dB Gain Adjust Range, Linear in V/V VARIABLE GAIN AMPLIFIER 23 • 150MHz SMALL-SIGNAL BANDWIDTH The VCA822 is a dc-coupled, wideband, linear in V/V, (G = +10V/V) continuously variable, voltage-controlled gain • 137MHz, 5V PP BANDWIDTH (G = +10V/V) amplifier. It provides a differential input to • 0.1dB GAIN FLATNESS to 28MHz single-ended conversion with a high-impedance gain • 1700V/µs SLEW RATE control input used to vary the gain down 40dB from the nominal maximum gain set by the gain resistor • > 40dB GAIN ADJUST RANGE (RG) and feedback resistor (RF). • HIGH GAIN ACCURACY: 20dB ±0.3dB The VCA822 internal architecture consists of two • HIGH OUTPUT CURRENT: ±160mA input buffers and an output current feedback amplifier stage integrated with a multiplier core to provide a complete variable gain amplifier (VGA) system that • DIFFERENTIAL LINE RECEIVERS does not require external buffering. The maximum • DIFFERENTIAL EQUALIZERS gain is set externally with two resistors, providing flexibility in designs. The maximum gain is intended • PULSE AMPLITUDE COMPENSATION to be set between +2V/V and +100V/V. Operating • VARIABLE ATTENUATORS from ±5V supplies, the gain control voltage for the • VOLTAGE-TUNABLE ACTIVE FILTERS VCA822 adjusts the gain linearly in V/V as the control • DROP-IN UPGRADE TO LMH6503 voltage varies from +1V to –1V. For example, set for a maximum gain of +10V/V, the VCA822 provides 10V/V, at +1V input, to 0.1V/V at –1V input of gain control range. The VCA822 offers excellent gain linearity. For a 20dB maximum gain, and a gain-control input voltage varying between 0V and 1V, the gain does not deviate by more than ±0.3dB (maximum at +25 °C). Table 1. VCA822 RELATED PRODUCTS GAIN ADJUST INPUT SIGNAL RANGE NOISE BANDWIDTH Figure 1. Differential Equalizer 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. Differential Equalization of an RC Load 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, 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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