The AD8324ACPZ is a low cost amplifier designed for coaxial linedriving. The features and specifications make the AD8324ideally suited for DOCSIS® 2.0 and EuroDOCSIS applications.The gain of the AD8324ACPZ is digitally controlled. An 8-bit serialword determines the desired output gain over a 59 dB range,resulting in gain changes of 1 dB/LSB.
The AD8324ACPZ accepts a differential or single-ended input signal.The output is specified for driving a 75 Ω load through a 1:1transformer.
Distortion performance of –54 dBc is achieved with an outputlevel up to 61 dBmV at 65 MHz bandwidth.This device has a sleep mode function that reduces the quiescentcurrent to 30 μA and a full power-down function that reducespower-down current to 2.5 mA.
The AD8324ACPZ is packaged in a low cost, 20-lead LFCSP and a20-lead QSOP. The AD8324ACPZ operates from a single 3.3 V supply.
Feature
- Supports DOCSIS 2.0 and EuroDOCSIS specifications for reverse path transmission systems
- Gain programmable in 1 dB steps over a 59 dB range
- Low distortion at 61 dBmV output
- −59 dBc SFDR at 21 MHz
- −54 dBc SFDR at 65 MHz
- Output noise level at minimum gain 1.3 nV/√Hz
- Maintains 75 Ω output impedance in transmit-enable and transmit-disable condition
- Upper bandwidth of 100 MHz (full gain range)
- 3.3 V supply operation
- Supports SPI® interfaces
Applications
- DOCSIS 2.0 and EuroDOCSIS cable modems
- CATV set-top boxes
- CATV telephony modems
- Coaxial and twisted pair line drivers
(Picture: Pinout)
