Part A
ADS1252U/2K5
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 6702 PCS
- Package
- SOIC-8
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS1252U/2K5 and ADS1251UG4 are both 24-bit delta-sigma analog-to-digital converters from Texas Instruments sharing the same SOIC-8 package and single-channel architecture, making them strong functional replacement candidates. The ADS1252U/2K5 offers a higher data rate of up to 41.7 kSPS versus 20 kSPS for the ADS1251UG4, so designers should confirm that the system timing and sampling requirements align with the lower-throughput ADS1251UG4 before substituting. Both devices operate over the industrial temperature range and use a similar serial interface, supporting straightforward drop-in evaluation.
Resolution
High match
Package Type
High match
Data Rate
Validation required
Supply Voltage
High match
Parts at a glance
Part B
ADS1251UG4
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 2511 PCS
- Package
- SOIC-8
- Series
- Data Acquisition - Analog to Digital Converters (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 | ADS1251UG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit delta-sigma ADCs, so resolution is equivalent for high-precision measurement applications. |
| Sample Rate (SPS) | 41.7k | 20k | The ADS1252 supports roughly double the maximum output data rate, which affects achievable throughput in faster acquisition systems. |
| Number of Input Channels | 1 (single-ended) | 1 (differential) | Input configuration differs: the ADS1252 is single-ended while the ADS1251 is differential, affecting signal conditioning and noise rejection design. |
| Interface Type | Serial (SPI-compatible) | Serial (SPI-compatible) | Both use a serial interface, so they are compatible with similar microcontroller/FPGA host connections. |
| Supply Voltage (V) | 5 | 5 | Both operate from a 5 V analog supply, simplifying power rail reuse in existing designs. |
| Package / Mounting | SOIC-8 (surface mount) | SOIC-8 (surface mount) | Identical package and footprint allow direct board-level substitution without layout changes. |
| Operating Temperature Range (°C) | -40 to +85 | -40 to +85 | Matching industrial temperature ranges ensure equivalent environmental robustness. |
| Input Type / PGA | No internal PGA | No internal PGA | Neither device includes a programmable gain amplifier, so external gain stages are required in both cases. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1252U/2K5 | ADS1251UG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 40k | 20k |
| Number of Inputs | 1 | 1 |
| Input Type | Differential | Differential |
| Data Interface | SPI | SPI |
| Configuration | ADC | ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 5V | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the ADS1252U/2K5 and the ADS1251UG4?
The ADS1252U/2K5 is a 24-bit delta-sigma ADC with a fixed data rate of 41.6 kSPS, while the ADS1251UG4 is a 24-bit delta-sigma ADC with a fixed data rate of 20 kSPS. Both are single-channel, 5V unipolar devices in SOIC-8 packages, but they differ in output data rate, clock frequency requirements, and noise performance. The ADS1252U/2K5 requires a 5 MHz master clock, whereas the ADS1251UG4 operates from a 4 MHz master clock.
Are the ADS1252U/2K5 and ADS1251UG4 pin-compatible?
Yes, both devices are offered in an 8-pin SOIC (D) package with the same pinout: VREF, VIN+, VIN-, GND, SCLK, DOUT, DRDY, and VDD. This pin compatibility allows a common PCB footprint, but firmware and clock timing must be adjusted because the two devices have different output data rates and master clock requirements.
What master clock frequency does each device require?
The ADS1252U/2K5 requires a 5 MHz master clock (CLK) to produce its 41.6 kSPS output data rate. The ADS1251UG4 requires a 4 MHz master clock to produce its 20 kSPS output data rate. The clock input is not internally generated; an external clock source must be provided on the CLK pin for both devices.
What is the output data rate of each converter?
The ADS1252U/2K5 provides a fixed output data rate of 41.6 kSPS. The ADS1251UG4 provides a fixed output data rate of 20 kSPS. Neither device offers a programmable data rate; the rate is determined by the external master clock frequency.
Do both devices support the same supply voltage and reference voltage?
Both devices operate from a single 5V analog supply (VDD) and use an external differential reference voltage (VREF) applied between the VREF and GND pins. The reference input range and absolute maximum ratings should be confirmed against the respective manufacturer datasheets before design, as the two products are separate datasheet documents.
What is the difference in noise performance between the ADS1252U/2K5 and ADS1251UG4?
The ADS1252U/2K5 achieves lower noise due to its higher 5 MHz clock and 41.6 kSPS data rate, which allows more averaging within the digital filter. The ADS1251UG4, operating at 20 kSPS with a 4 MHz clock, has a correspondingly different noise specification. Designers should consult the respective datasheet noise tables (RMS noise versus input signal) for the exact figures, as the two parts are specified separately.
Can the ADS1251UG4 be used as a drop-in replacement for the ADS1252U/2K5?
Not as a direct drop-in replacement without design changes. Although the packages and pinouts are identical, the master clock frequency (4 MHz vs 5 MHz) and output data rate (20 kSPS vs 41.6 kSPS) differ. The host firmware, clock source, and any timing-dependent signal processing must be revalidated for the target device.
What is the difference in the ordering suffix "U/2K5" versus "UG4"?
The "U/2K5" suffix on the ADS1252U/2K5 indicates a tube or tape-and-reel packaging quantity of 2,500 units per reel in the SOIC-8 (D) package. The "UG4" suffix on the ADS1251UG4 indicates the SOIC-8 (D) package with a specific lead finish and packaging option per the manufacturer's ordering guide. Both suffixes refer to the same base die and package type; the difference is in packaging and orderable part number convention.