TLC3548CDWR Equivalent & Substitute Parts

Part Overview

The TLC3548CDWR is a 14-bit Analog to Digital Converter (ADC) manufactured by Texas Instruments, designed for data acquisition applications requiring moderate resolution and sampling rates. This device features a Successive Approximation Register (SAR) architecture with configurable input channels (4 or 8), supporting both pseudo-differential and single-ended input types via SPI interface. The part is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute components is necessary to ensure design continuity and maintain supply chain reliability for applications currently utilizing this device.

Substiute Parts

TLC3548CDWR

Texas InstrumentsIn Stock: 990TLC3548CDWR Datasheet

Current PartRFQ

ADS7951SDBTR

Texas InstrumentsIn Stock: 8146ADS7951SDBTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TLC3548CDWR is determined by the following critical parameters:

Core Functional Parameters:

• Data Interface: SPI compatibility is mandatory
• Architecture: SAR-based conversion required
• Number of A/D Converters: Single converter configuration
• Configuration: MUX-S/H-ADC topology

Electrical Compatibility Parameters:

• Resolution (Number of Bits): Minimum 12 bits required for functional equivalence
• Sampling Rate: Minimum 200k samples per second
• Input Channels: Minimum 8 inputs to accommodate existing designs
• Reference Type: External reference capability required
• Supply Voltage Ranges: Digital supply 2.7V ~ 5.5V overlap required

Physical & Compliance Parameters:

• Mounting Type: Surface Mount required
• RoHS Status: ROHS3 Compliant required
• REACH Status: REACH Unaffected required

The ADS7951SDBTR qualifies as a substitute based on these criteria, though with noted parameter differences in resolution and sampling rate.

Parameter Comparison

Engineering Selection Recommendations

The ADS7951SDBTR is the designated substitute for the TLC3548CDWR based on manufacturer recommendation and compliance alignment. Both devices are ROHS3 Compliant and REACH Unaffected, meeting regulatory requirements for current applications.

Key Considerations:

The ADS7951SDBTR maintains SPI interface compatibility and SAR architecture consistency. The substitute offers extended product lifecycle status (Active versus Last Time Buy), ensuring long-term availability and supply chain stability.

Package transition from 24-SOIC to 30-TFSOP requires PCB layout modification. The ADS7951SDBTR provides enhanced sampling rate capability (1M versus 200k samples per second) and extended operating temperature range (-40°C ~ 125°C versus 0°C ~ 70°C).

Resolution reduction from 14 bits to 12 bits represents a 2-bit decrease in conversion accuracy. Applications requiring the full 14-bit resolution of the original device must evaluate whether 12-bit resolution meets functional requirements.

The ADS7951SDBTR supports single-ended inputs only, eliminating pseudo-differential input capability present in the TLC3548CDWR. Designs utilizing pseudo-differential input configurations require circuit topology reassessment.

Frequently Asked Questions (FAQ)

Q: Can the ADS7951SDBTR directly replace the TLC3548CDWR without design changes?

A: Direct pin-for-pin replacement is not possible due to package differences (24-SOIC versus 30-TFSOP) and pin count variation. PCB layout redesign is required. Functional compatibility exists for applications using single-ended inputs only.

Q: What is the impact of the 2-bit resolution difference?

A: The TLC3548CDWR provides 14-bit resolution (16,384 levels), while the ADS7951SDBTR provides 12-bit resolution (4,096 levels). Applications requiring 14-bit accuracy must evaluate whether the reduced resolution meets measurement precision requirements.

Q: Does the ADS7951SDBTR support pseudo-differential inputs?

A: No. The ADS7951SDBTR supports single-ended inputs only. The TLC3548CDWR supports both pseudo-differential and single-ended configurations. Designs dependent on pseudo-differential input capability require alternative solutions.

Q: Are there supply voltage compatibility issues?

A: The ADS7951SDBTR digital supply range (1.7V ~ 5.25V) overlaps with the TLC3548CDWR range (2.7V ~ 5.5V) between 2.7V and 5.25V. Designs operating below 2.7V or above 5.25V require voltage supply reassessment.

Q: What are the implications of the extended operating temperature range?

A: The ADS7951SDBTR operates from -40°C ~ 125°C compared to the TLC3548CDWR range of 0°C ~ 70°C. This provides broader environmental capability for applications requiring extended temperature operation.

Q: Is the higher sampling rate of the ADS7951SDBTR beneficial?

A: The ADS7951SDBTR sampling rate of 1M samples per second exceeds the TLC3548CDWR rate of 200k samples per second. This enhancement supports higher-frequency signal acquisition but does not affect applications limited to 200k sampling rates.

Q: Are both devices RoHS and REACH compliant?

A: Yes. Both the TLC3548CDWR and ADS7951SDBTR are ROHS3 Compliant and REACH Unaffected, meeting current regulatory requirements for electronic component manufacturing and use.