AD8324ACPZ

Overview

The AD8324ACPZ 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 features digitally programmable gain over a 59 dB range with 1 dB steps via an SPI interface. Key electrical parameters include a maximum quiescent current of 207 mA at full gain and 30 µA in sleep mode. It maintains a differential output impedance of 75 Ω and supports an upper bandwidth of 100 MHz across the entire gain range.

Feature Summary

• Digital gain control via SPI interface allows precise adjustment over a 59 dB range.
• Maintains consistent 75 Ω differential output impedance during transmit enable and disable states.
• Integrated power-saving modes reduce current consumption significantly in sleep and transmit-disable conditions.
• Optimized for DOCSIS 2.0 and EuroDOCSIS reverse path transmission systems.

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, as the AD8324 series includes both LFCSP and QSOP options with different temperature ranges. Confirm that the ordering suffix corresponds to the required thermal performance and mechanical footprint. Ensure compatibility with the system's serial interface timing requirements for CLK, SDATA, and DATEN signals before integration.

Selection Notes

Select the AD8324ACPZ when a cost-effective solution for upstream cable driving is required. This component is suitable for designs needing digital gain programming without external attenuators. Consider the 20-lead LFCSP package for compact layouts requiring operation between -40°C and +85°C. Evaluate power constraints if continuous high-gain operation is necessary due to higher quiescent current draw.

Part Context

Analog Devices introduced the AD8324 in 2003 as a specialized amplifier for coaxial line driving. It belongs to a family of devices tailored for cable modem and CATV infrastructure. The ACPZ designation indicates the lead-free 20-lead LFCSP package variant, distinguishing it from the older QSOP versions while maintaining identical functional specifications.

Replacement Considerations

Public documentation confirms the AD8324ACP as a direct equivalent within the same product family. Both variants share identical electrical characteristics and pinouts. Verify that the replacement part meets the specific temperature grade requirements of the target application, particularly regarding the extended industrial range available in the LFCSP format.