器件名称: AD883B
功能描述: Low Noise, 90 MHz Variable-Gain Amplifier
文件大小: 219.5KB 共14页
简 介:a
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 PRODUCT DESCRIPTION
Low Noise, 90 MHz Variable-Gain Amplifier AD603*
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 s 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-control gains offset to optimize the system S/N ratio. The AD603 can drive a load impedance as low as 100 with low distortion. For a 500 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 minimum into a 500 load, or ± 1 V into a 100 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……
