AD8324ACP

Overview

The AD8324ACP is a low-cost, single-channel line driver designed for coaxial cable applications. It operates from a single 3.3 V supply with a voltage range of 3.13 V to 3.47 V. The device provides a digitally programmable gain range of 59 dB in 1 dB steps via an SPI interface. Key electrical specifications include a bandwidth of 100 MHz, a quiescent current of 207 mA at maximum gain, and a sleep mode current of 30 µA. It maintains a differential output impedance of 75 Ω.

Feature Summary

• Digitally controlled gain via SPI interface with 1 dB resolution
• Maintains 75 Ω output impedance in transmit-enable and disable states
• Supports DOCSIS 2.0 and EuroDOCSIS reverse path transmission standards
• Integrated power-saving modes including transmit disable and sleep

Applications

• DOCSIS 2.0 and EuroDOCSIS cable modems
• CATV set-top boxes
• CATV telephony modems
• Coaxial and twisted pair line drivers

Procurement Notes

Verify the specific package variant required, as the AD8324 family includes both LFCSP-20 and QSOP-20 options. Confirm that the ordering suffix corresponds to the desired thermal and mechanical form factor. Ensure compatibility with the system's serial interface timing requirements for CLK, SDATA, and DATEN signals before finalizing procurement.

Selection Notes

Select this component for upstream cable line driving where digital gain control is necessary. Consider the operating temperature range when choosing between the industrial grade LFCSP variant and the commercial grade QSOP variant. Evaluate the power consumption profiles across different gain codes to ensure the system power budget accommodates the maximum quiescent current requirements during active transmission.

Part Context

The AD8324 is part of Analog Devices' specialized amplifier portfolio focused on cable television infrastructure. It serves as a dedicated upstream power amplifier solution, replacing discrete designs with a highly integrated, cost-effective alternative. The device simplifies PCB layout by integrating the attenuator core and logic interfaces directly into the amplifier stage.

Replacement Considerations

Direct replacements within the AD8324 series include variants with different packaging such as AD8324JRQZ or AD8324ACPZ. Verify that any substitute matches the original pinout and electrical characteristics, particularly the gain programming interface and output impedance specifications.