AD8328ACP

Overview

The AD8328ACP is a 5 V upstream cable line driver designed for coaxial transmission. It features digitally programmable gain with a range of 59 dB in 1 dB steps, controlled via an SPI interface. The device supports DOCSIS and EuroDOCSIS standards, offering low distortion performance with -57.5 dBc SFDR at 21 MHz and -54 dBc at 65 MHz when outputting 60 dBmV. It maintains a 300 Ω differential output impedance and operates over a temperature range of -40°C to +85°C.

Feature Summary

• Supports DOCSIS and EuroDOCSIS reverse path transmission standards
• Digitally programmable gain control via SPI interface
• Maintains consistent output impedance in transmit enable and disable states
• Includes sleep mode for significant power reduction

Applications

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

Procurement Notes

Verify the specific suffix 'ACP' against the manufacturer's current ordering guide to confirm package type and temperature grade. Confirm that the component status is acceptable for new designs, as documentation may indicate obsolete status for certain variants. Ensure compatibility with required PCB footprints for the specified package option.

Selection Notes

Select this component for applications requiring precise digital gain control in upstream cable paths. Consider the 5 V supply requirement and the need for an external 2:1 transformer for proper output matching. Evaluate the trade-off between quiescent current consumption and thermal dissipation, particularly when operating at maximum gain codes.

Part Context

The AD8328 is part of Analog Devices' portfolio of cable line drivers intended for broadband communication infrastructure. It serves as a power amplifier solution for upstream signals in hybrid fiber-coaxial networks. The device integrates attenuation control and power management features to meet strict spectral emission requirements defined by cable modem standards.

Replacement Considerations

Publicly confirmed substitutes are not available in the provided source material. Designers should consult the manufacturer's official replacement matrix or contact technical support directly to identify qualified alternative components that match the electrical specifications and pinout configuration.