AD9875BST

Overview

The AD9875BST is a single-supply broadband modem mixed-signal front end (MxFE) IC manufactured by Analog Devices Inc. It integrates a transmit path featuring a TxDAC+ with selectable 2× or 4× interpolation filters and a receive path comprising a programmable gain amplifier (PGA), low-pass filter (LPF), and ADC. The device provides 10-bit resolution for both paths, supporting input data rates up to 64 MSPS and DAC output update rates of 128 MSPS. An internal PLL generates required clocks from a single crystal or clock input. The AD9875BST operates over the industrial temperature range of –40°C to +85°C and is housed in a 48-lead LQFP package.

Feature Summary

• Integrated 10-bit TxDAC+ with 2×/4× interpolating LPF/BPF and differential current outputs adjustable from 2 mA to 20 mA.
• Receive path includes a PGA with –6 dB to +36 dB gain range and a programmable LPF with 12 MHz or 26 MHz cutoff frequencies.
• Internal PLL clock multiplier generates all system clocks from a single external crystal or clock source.
• Voltage Regulator Controller (VRC) supports an external MOSFET to create a cost-effective 1.3 V linear regulator.

Applications

• Powerline Networking
• Home Phone Networking
• xDSL Systems
• Broadband Wireless Applications
• Home RF

Procurement Notes

Verify the specific ordering suffix 'BST' corresponds to the 48-lead LQFP package and the –40°C to +85°C industrial temperature range as listed in the manufacturer's ordering guide. Confirm that the Rev A datasheet specifications align with current production requirements, noting that parameters are subject to change without notice.

Selection Notes

Select the AD9875BST when a single-supply 3.3 V CMOS MxFE solution is required for broadband modem applications. Ensure the design accommodates the 48-lead LQFP footprint and utilizes the internal PLL for clock generation. Consider the pin-compatible AD9876 if 12-bit converter performance is necessary instead of the 10-bit resolution provided by this model.

Part Context

The AD9875 is part of Analog Devices' MxFE product line, designed to simplify signal chain integration for broadband modems. It is pin-compatible with the 12-bit AD9876, allowing for design flexibility between 10-bit and 12-bit performance levels within the same package form factor. Both devices share the same space-saving 48-lead LQFP enclosure.

Replacement Considerations

The AD9876 is a pin-compatible alternative offering 12-bit resolution for both transmit and receive paths. Verify interface compatibility and register mapping differences before substitution, as the higher resolution may impact data throughput requirements and power consumption profiles.