NS公司的RD-179高IF亚取样接收器子系统参考设计SP16160CH1RB采用ADC16DV160 ADC, LMH6517数控可变增益放大器(DVGA)和LMK04031B 精密时钟调理器,主要用在无线基础设备.
LMH6517: Low Power, Low Noise, IF and Baseband, Dual 16 bit ADC Driver With Digitally Controlled Gain
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 communication 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 0.5dB gain steps over a 31.5dB 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 commands 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℃ to +85℃. The LMH6517 is available in a 32-Pin, thermally enhanced, LLP package.
LMH6517主要特性:
■ Accurate, 0.5dB gain steps
■ 200Ω Resistive, differential input
■ Low impedance, differential output
■ Disable function for each channel
■ Parallel gain control
■ SPI compatible serial bus
■ Two wire, Pulse Mode control
■ On chip register stores gain setting
■ Low sensitivity of linearity and phase to gain setting
■ Single 5V supply voltage
■ Small footprint LLP package
LMH6517主要指标:
■ OIP3: 44dBm @ 200MHz
■ Noise figure 5.5dB
■ Gain step size of 0.5dB
■ Gain step accuracy: 0.05dB
■ Frequency Range of 1200 MHz
■ Supply current 80mA per channel
LMH6517应用:
■ Cellular base stations
■ IF sampling receivers
■ Instrumentation
■ Modems
■ Imaging
