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AD883B Datasheet(PDF) 1 Page - Analog Devices |
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AD883B Datasheet(HTML) 1 Page - Analog Devices |
1 / 14 page REV. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD603* FEATURES “Linear in dB” Gain Control Pin Programmable Gain Ranges –11 dB to +31 dB with 90 MHz Bandwidth +9 dB to +51 dB with 9 MHz Bandwidth Any Intermediate Range, e.g., –1 dB to +41 dB with 30 MHz Bandwidth Bandwidth Independent of Variable Gain 1.3 nV/ √Hz Input Noise Spectral Density 0.5 dB Typical Gain Accuracy MIL-STD-883 Compliant and DESC Versions Available APPLICATIONS RF/IF AGC Amplifier Video Gain Control A/D Range Extension Signal Measurement Low Noise, 90 MHz Variable-Gain Amplifier PRODUCT DESCRIPTION The AD603 is a low noise, voltage-controlled amplifier for use in RF and IF AGC systems. It provides accurate, pin selectable gains of –11 dB to +31 dB with a bandwidth of 90 MHz or +9 dB to +51 dB with a bandwidth of 9 MHz. Any intermediate gain range may be arranged using one external resistor. The input referred noise spectral density is only 1.3 nV/ √Hz and power consumption is 125 mW at the recommended ±5 V supplies. The decibel gain is “linear in dB,” accurately calibrated, and stable over temperature and supply. The gain is controlled at a high impedance (50 M Ω), low bias (200 nA) differential input; the scaling is 25 mV/dB, requiring a gain-control voltage of only FUNCTIONAL BLOCK DIAGRAM SCALING REFERENCE VG GAIN CONTROL INTERFACE AD603 PRECISION PASSIVE INPUT ATTENUATOR FIXED GAIN AMPLIFIER *NORMAL VALUES R = 2R LADDER NETWORK VPOS VNEG GPOS GNEG VINP COMM 0dB –6.02dB –12.04dB –18.06dB –24.08dB –30.1dB –36.12dB –42.14dB RR RR R R R 2R 2R 2R 2R 2R 2R R 20 * 694 * 6.44k * VOUT FDBK 1 V to span the central 40 dB of the gain range. An over- and under-range of 1 dB is provided whatever the selected range. The gain-control response time is less than 1 µs for a 40 dB change. The differential gain-control interface allows the use of either differential or single-ended positive or negative control voltages. Several of these amplifiers may be cascaded and their gain-con- trol gains offset to optimize the system S/N ratio. The AD603 can drive a load impedance as low as 100 Ω with low distortion. For a 500 Ω load in shunt with 5 pF, the total harmonic distortion for a ±1 V sinusoidal output at 10 MHz is typically –60 dBc. The peak specified output is ±2.5 V mini- mum into a 500 Ω load, or ±1 V into a 100 Ω load. The AD603 uses a proprietary circuit topology—the X-AMP™. The X-AMP comprises a variable attenuator of 0 dB to –42.14 dB followed by a fixed-gain amplifier. Because of the attenuator, the amplifier never has to cope with large inputs and can use negative feedback to define its (fixed) gain and dynamic performance. The attenuator has an input resistance of 100 Ω, laser trimmed to ±3%, and comprises a seven-stage R-2R ladder network, resulting in an attenuation between tap points of 6.021 dB. A proprietary interpolation technique provides a continuous gain-control function which is linear in dB. The AD603A is specified for operation from –40 °C to +85°C and is available in both 8-lead SOIC (R) and 8-lead ceramic DIP (Q). The AD603S is specified for operation from –55 °C to +125 °C and is available in an 8-lead ceramic DIP (Q). The AD603 is also available under DESC SMD 5962-94572. *Patented. X-AMP is a trademark of Analog Devices, Inc. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2000 |
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