LM98725CCMT/NOPB

Analog Front End (AFE) Overview

The LM98725CCMT/NOPB is a three-channel analog front-end (AFE) designed for CCD and CIS signal processing. It integrates correlated double sampling (CDS) and a 16-bit ADC, operating at a maximum sampling rate of 81 MSPS per channel. The device supports single-ended inputs and provides LVDS or CMOS digital outputs. It functions within a supply voltage range of 3 V to 3.6 V, with an analog supply of 3.3 V and a reference voltage of 3.3 V. Key electrical specifications include a power dissipation of 755 mW and a signal-to-noise ratio (SNR) of 74 dB. The component is housed in a 56-pin TSSOP package.

Analog Front End (AFE) Feature Summary

• Three-channel AFE with integrated CDS and 16-bit ADC
• Maximum sampling rate of 81 MSPS per channel
• Supports LVDS and CMOS output interfaces
• Operates on 3 V to 3.6 V digital and 3.3 V analog supplies

Analog Front End (AFE) Applications

• CCD image signal processing
• CIS signal conditioning
• Industrial imaging systems

Analog Front End (AFE) Procurement Notes

Verify the obsolescence status before procurement, as the component is listed as 'End of Life' with imminent discontinuation by the manufacturer. Confirm availability through authorized distributors or secondary market suppliers like Rochester Electronics. Ensure compliance with RoHS directives and check moisture sensitivity levels for proper handling during assembly.

Analog Front End (AFE) Selection Notes

Select this component for legacy designs requiring three-channel CCD/CIS processing with high-speed conversion. Compare against newer alternatives like the VSP5621 if new design rules apply, noting differences in channel count and output formats. Verify that the 81 MSPS speed and 16-bit resolution meet system requirements. Ensure the TSSOP-56 package fits the PCB layout constraints.

Analog Front End (AFE) Part Context

The LM98725 belongs to the LM98725 series of analog front-ends from Texas Instruments. It is positioned as an older generation solution for image sensing applications. While it offers robust performance for its time, it is being phased out in favor of more modern devices such as the VSP5621, which provides four channels and different interface options.

Analog Front End (AFE) Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. The VSP5621 is mentioned as a comparative device but has different channel counts and features. Designers should evaluate the VSP5621 or other current TI AFEs for new designs, ensuring compatibility with existing system architectures.