AD8320ARP Datasheet PDF - ADI

●DESCRIPTION

●The AD8320 is a digitally controlled variable gain amplifier optimized for coaxial line driving applications. An 8-bit serial word determines the desired output gain over a 36 dB range (256 gain levels). The AD8320 provides linear gain response.

●The AD8320 is made up of a digitally controlled variable at tenuator of 0 dB to –36 dB, which is preceded by a low noise, fixed gain buffer and followed by a low distortion high power amplifier. The AD8320 has a 220 Ω input impedance and accepts a single-ended input signal with a specified analog input level of up to 0.310 V p-p. The output is specified for driving a 75 Ω load, such as coaxial cable, although the AD8320 is capable of driving other loads. Distortion performance of –57 dBc is achieved with an output level up to 12 dBm (3.1 V p-p) at 42 MHz, while –46 dBc distortion is achieved with an output level up to 18 dBm (6.2 V p-p).

●FEATURES

●  8-Bit Serial Gain Control

●     V/V/LSB Linear Gain Response

●  36 dB Gain Range

●     ±0.20 dB Gain Accuracy

●  Upper Bandwidth: 150 MHz

●  22 dBm 1 dB Compression Point (75 V)

●  Drives Low Distortion Signals into 75 V Load:

●     –57 dBc SFDR at 42 MHz and 12 dBm Out

●     –46 dBc SFDR at 42 MHz and 18 dBm Out

●  Single Supply Operation from 5 V to 12 V

●  Maintains 75 V Output Impedance Power-Up and Power-Down Condition

●  Supports SPI Input Control Standard

●APPLICATIONS

●  Coaxial Cable Driver

●     HFC Cable Telephony Systems

●     HFC High Speed Data Modems

●     Interactive Set-Top Boxes

●     PC Plug-In Modems

●  Interfaces with AD9853 I2C Controlled Digital Modulator

●  High Performance Digitally Controlled Variable Gain Block