LMH6517 Datasheet | National Semiconductor

LMH6517 Multi Standard, IF and Baseband, Dual, DVGA .. PRELIMINARY November 10, 2008 LMH6517 Multi Standard, IF and Baseband, Dual, DVGA General Description The LMH6517 contains two high performance digitally controlled variable gain amplifiers (DVGA). It has been designed for use in narrowband and broadband IF sampling applications. Typically the LMH6517 drives a high performance ADC in a broad range of mixed signal and digital munication applications such as mobile radio and cellular base stations where automatic gain control (AGC) is required to increase system dynamic range. Each channel of LMH6517 has an independent digitally controlled attenuator and a high linearity, differential output amplifier. Each block has been optimized for low distortion and maximum system design flexibility. Each channel can be individually disabled for power savings. The LMH6517 digitally controlled attenuator provides precise 0.5 d B gain steps over a 31.5 d B range. On chip digital latches are provided for local storage of the gain setting. Both serial and parallel programming options are provided. A Pulse mode is also offered where simple up or down mands can change the gain one step at a time. The output amplifier has a differential output allowing large signal swings on a single 5V supply. The low impedance output provides maximum flexibility when driving filters or analog to digital converters. The LMH6517 operates over the industrial temperature range of - 40°C to +85°C. The LMH6517 is available in a 32-Pin, thermally enhanced, LLP package. Features - - - - - - - - - - Accurate, 0.5d B gain steps 200Ω Resistive, differential input Low impedance, differential output Disable function for each channel Parallel or serial gain control SPI patible serial bus On chip register stores gain setting Low sensitivity of linearity and phase to gain setting Single 5V supply voltage Small footprint LLP package Key Specifications - - - - - - Gain step size of 0.5 d...