Part A
ADS1252U/2K5
Texas Instruments
- Lifecycle
- Active
- Stock
- 6702 PCS
- Package
- SOIC-8
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1252U/2K5 and ADS1211UG4 are both 24-bit delta-sigma analog-to-digital converters, but they differ fundamentally in resolution architecture, channel count, digital interface, and package footprint. The ADS1252U/2K5 is a single-channel, high-speed ADC with a serial SPI-compatible interface in a narrow SOIC-8 package, while the ADS1211UG4 is a four-channel device with a configurable serial interface in a wider SOIC-28 package. Because these differences affect board layout, firmware, and system architecture, the ADS1211UG4 cannot serve as a direct drop-in substitute for the ADS1252U/2K5 without significant redesign.
Different channel count
Different digital interface
Different package footprint
Different data rate capability
Parts at a glance
Part B
ADS1211UG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 7896 PCS
- Package
- SOIC-24
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS1252U/2K5 | ADS1211UG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit delta-sigma ADCs, so resolution alone does not differentiate them for substitutability. |
| Number of input channels | 1 (single-ended) | 4 (differential) / 8 (single-ended) | Channel count determines how many signals can be measured; the ADS1211 supports multi-channel systems while the ADS1252 is single-channel only. |
| Maximum data rate (SPS) | 41.7k | 19.5k | Data rate affects achievable sampling bandwidth; the ADS1252 offers roughly twice the throughput of the ADS1211. |
| Input type | Single-ended | Differential | Differential inputs reject common-mode noise and improve accuracy in noisy environments, while single-ended inputs simplify wiring. |
| Interface | SPI (serial) | SPI (serial) | Both use a serial SPI-compatible interface, easing drop-in replacement from a digital host perspective. |
| Supply voltage | 5 V (analog and digital) | 5 V (analog and digital) | Matching supply requirements means the same power rail can be reused without redesign. |
| Package | SOIC-8 | SOIC-24 | Different package footprints and pin counts prevent direct board-level substitution without layout changes. |
| PGA / gain stage | No (fixed gain) | Yes (programmable gain amplifier) | An integrated PGA allows direct amplification of small signals, reducing external circuitry for low-level sensor applications. |
| Operating temperature range | -40°C to +85°C | -40°C to +85°C | Identical temperature ratings mean both suit the same industrial-grade environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1252U/2K5 | ADS1211UG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 40k | 16k |
| Number of Inputs | 1 | 4 |
| Input Type | Differential | Differential |
| Data Interface | SPI | SPI |
| Configuration | ADC | MUX-PGA-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External, Internal |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 5V | 5V |
| Features | - | PGA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the primary differences between the ADS1252U/2K5 and the ADS1211UG4?
The ADS1252U/2K5 is a 24-bit delta-sigma analog-to-digital converter with a fixed data rate of approximately 41.7 kSPS and a single differential input, supplied in an SOIC-8 package. The ADS1211UG4 is a 24-bit delta-sigma ADC featuring a 4-channel input multiplexer, programmable gain amplifier, and programmable data rates up to 15.6 kSPS, supplied in a SOIC-28 package. The ADS1211UG4 offers more input channels and gain flexibility, while the ADS1252U/2K5 provides a higher fixed output rate with a simpler, smaller footprint.
Are the ADS1252U/2K5 and ADS1211UG4 pin-to-pin compatible?
No. The ADS1252U/2K5 is housed in an 8-pin SOIC package, whereas the ADS1211UG4 is housed in a 28-pin SOIC package. The pin counts, pin functions, and package dimensions differ, so they are not pin-to-pin compatible and cannot be interchanged on the same PCB land pattern without redesign.
How do the input configurations of the ADS1252U/2K5 and ADS1211UG4 differ?
The ADS1252U/2K5 provides a single differential input channel. The ADS1211UG4 includes a 4-channel differential input multiplexer, allowing selection among multiple input pairs. Designs requiring multiple sensor inputs may favor the ADS1211UG4, while single-channel designs can use the ADS1252U/2K5.
What are the maximum data rates of the ADS1252U/2K5 and ADS1211UG4?
The ADS1252U/2K5 operates at a fixed data rate of approximately 41.7 kSPS. The ADS1211UG4 has a programmable data rate with a maximum of 15.6 kSPS. The ADS1252U/2K5 therefore offers a higher output rate, while the ADS1211UG4 allows the data rate to be adjusted for resolution and noise trade-offs.
Do both devices include a programmable gain amplifier (PGA)?
No. The ADS1211UG4 includes an on-chip programmable gain amplifier, enabling gain settings for low-level signals. The ADS1252U/2K5 does not include a PGA; it provides a fixed input range and relies on external signal conditioning for gain adjustment.
What are the supply voltage requirements for the ADS1252U/2K5 and ADS1211UG4?
Both devices operate from a single 5 V analog supply. The ADS1252U/2K5 also requires a digital supply in the 1.8 V to 3.3 V range for its digital interface, while the ADS1211UG4 operates with a 5 V digital supply. Designers should verify the exact supply and interface voltage requirements against the respective manufacturer datasheets.
Which device is better suited for multi-channel data acquisition systems?
The ADS1211UG4 is better suited for multi-channel data acquisition because it integrates a 4-channel input multiplexer and a PGA, reducing external component count. The ADS1252U/2K5 is a single-channel converter and would require external multiplexing and signal conditioning for multi-channel applications.
Can the ADS1252U/2K5 and ADS1211UG4 be used interchangeably in an existing design?
No. Differences in package size, pin count, input channel count, data rate, and PGA functionality prevent direct interchangeability. Any substitution requires a PCB redesign and validation against the target system's requirements and the manufacturer datasheets.