TLV1570CDW Equivalent & Substitute Parts

Part Overview

The TLV1570CDW is a 10-bit Analog to Digital Converter (ADC) manufactured by Texas Instruments, designed for data acquisition applications requiring 8 single-ended inputs with SAR (Successive Approximation Register) architecture. The device operates across a 2.7V to 5.5V supply range and achieves a sampling rate of 1.25M samples per second with SPI digital interface.

This part is designated as Last Time Buy, indicating end-of-life status. Identifying functionally equivalent alternatives is necessary for design continuity, long-term product support, and inventory planning.

Key Parameters

Parameter	Value
Resolution (Bits)	10
Number of Inputs	8
Input Type	Single Ended
Sampling Rate (SPS)	1.25M
Architecture	SAR
Data Interface	SPI
Configuration	MUX-ADC
Analog Supply Voltage	2.7V ~ 5.5V
Digital Supply Voltage	2.7V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package	20-SOIC
Reference Type	External, Internal

Substitute Part Grouping Explanation

Substitution eligibility for the TLV1570CDW is determined by the following core parameters:

Resolution: 10-bit ADC architecture
Channel Count: 8 single-ended inputs
Sampling Rate: Minimum 1M SPS (TLV1570CDW operates at 1.25M SPS)
Data Interface: SPI protocol compatibility
Architecture: SAR-based conversion
Supply Voltage Compatibility: Overlapping analog and digital supply ranges

The ADS7955SDBTR meets these substitution criteria. Both devices share identical resolution, input channel configuration, input type, data interface, and SAR architecture. The ADS7955SDBTR operates at 1M SPS, which is within acceptable performance parameters for applications designed around the TLV1570CDW's 1.25M SPS specification.

Parameter Comparison

Parameter	TLV1570CDW	ADS7955SDBTR	Compatibility Notes
Resolution (Bits)	10	10	Identical
Number of Inputs	8	8	Identical
Input Type	Single Ended	Single Ended	Identical
Sampling Rate (SPS)	1.25M	1M	ADS7955SDBTR operates at lower rate
Architecture	SAR	SAR	Identical
Data Interface	SPI	SPI	Identical
Configuration	MUX-ADC	MUX-S/H-ADC	ADS7955SDBTR includes integrated sample-and-hold
Analog Supply Voltage	2.7V ~ 5.5V	2.7V ~ 5.25V	Overlapping range; ADS7955SDBTR upper limit 5.25V
Digital Supply Voltage	2.7V ~ 5.5V	1.7V ~ 5.25V	ADS7955SDBTR supports lower digital supply
Operating Temperature	0°C ~ 70°C	-40°C ~ 125°C	ADS7955SDBTR supports extended range
Package	20-SOIC	30-TSSOP	Different package; PCB layout modification required
Reference Type	External, Internal	External	ADS7955SDBTR supports external reference only

Engineering Selection Recommendations

The ADS7955SDBTR is the manufacturer-recommended substitute for the TLV1570CDW. Both devices are manufactured by Texas Instruments and maintain ROHS3 compliance and REACH unaffected status.

Selection considerations based on provided specifications:

Product Status: The TLV1570CDW is Last Time Buy; the ADS7955SDBTR is Active, ensuring long-term availability and support.
Sampling Rate: The ADS7955SDBTR operates at 1M SPS versus the TLV1570CDW's 1.25M SPS. Applications requiring the full 1.25M SPS specification must evaluate whether 1M SPS meets functional requirements.
Package Transition: The ADS7955SDBTR uses 30-TSSOP packaging versus the TLV1570CDW's 20-SOIC. PCB layout and footprint modifications are required.
Reference Configuration: The ADS7955SDBTR supports external reference only, whereas the TLV1570CDW supports both external and internal references. Designs relying on internal reference functionality require external reference implementation.
Temperature Range: The ADS7955SDBTR supports -40°C to 125°C operation, providing extended temperature capability beyond the TLV1570CDW's 0°C to 70°C range.

Frequently Asked Questions (FAQ)

Q: Can the ADS7955SDBTR directly replace the TLV1570CDW without design modifications?

A: Direct pin-for-pin replacement is not possible due to different package types (20-SOIC versus 30-TSSOP). PCB layout redesign is required. Additionally, if the original design uses the TLV1570CDW's internal reference, external reference circuitry must be implemented for the ADS7955SDBTR.

Q: What is the impact of the lower sampling rate on the ADS7955SDBTR?

A: The ADS7955SDBTR operates at 1M SPS compared to the TLV1570CDW's 1.25M SPS. Applications must verify that 1M SPS meets their bandwidth and signal acquisition requirements. For applications with strict 1.25M SPS requirements, alternative parts should be evaluated.

Q: Are both devices compatible with existing SPI interface implementations?

A: Both devices use SPI data interface protocol. However, detailed register maps and command structures should be verified against device datasheets to ensure software compatibility.

Q: What are the supply voltage considerations when substituting?

A: The ADS7955SDBTR's analog supply range (2.7V ~ 5.25V) is slightly narrower than the TLV1570CDW (2.7V ~ 5.5V). Designs operating at 5.5V analog supply require verification that 5.25V operation is acceptable. The ADS7955SDBTR's digital supply supports lower voltages (1.7V minimum), providing additional flexibility for mixed-voltage systems.

Q: Does the integrated sample-and-hold in the ADS7955SDBTR affect circuit design?

A: The ADS7955SDBTR includes integrated sample-and-hold (MUX-S/H-ADC configuration) with 1:1 ratio, whereas the TLV1570CDW uses MUX-ADC configuration. This difference may affect input signal conditioning requirements and should be evaluated against application specifications.

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