Part A
ADS1252U/2K5
德州儀器
- Lifecycle
- Active
- Stock
- 6702 件
- Package
- SOIC-8
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Not a drop-in replacement
The ADS1252U/2K5 and ADS1250UG4 are both 24-bit delta-sigma ADCs, but they differ in resolution architecture, sample rate, package, and reference configuration, so they are not interchangeable without a full design review. The ADS1252U/2K5 offers a higher output data rate in a compact SOIC-8, while the ADS1250UG4 provides a lower sample rate in a wider SOIC-16 with a different input and reference arrangement. Engineers should treat these as distinct signal-chain components rather than direct substitutes.
Different sample rate
Different package footprint
Different reference configuration
Different input architecture
Parts at a glance
Part B
ADS1250UG4
德州儀器
- Lifecycle
- Active
- Stock
- 6997 件
- Package
- SOIC-16
- Series
- 資料獲取-模數轉換器（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 | ADS1250UG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 20 | Higher resolution provides finer measurement granularity; a 24-bit ADC resolves smaller signal changes than a 20-bit ADC, affecting precision-critical applications. |
| Sample Rate (max) | 41 kSPS | 25 kSPS | Maximum sampling rate determines the highest signal bandwidth that can be digitized; a faster rate supports higher-frequency inputs and faster data acquisition. |
| Number of Input Channels | 1 (single-ended) | 1 (differential) | Single-ended versus differential input configuration affects noise immunity and how the sensor must be wired; differential inputs reject common-mode noise better. |
| Input Type | Single-ended | Differential | The input topology must match the signal source; substituting one for the other may require circuit redesign and can change noise performance. |
| Interface | SPI (serial) | SPI (serial) | Both use a serial SPI-compatible interface, so the digital host connection is largely compatible, though timing and register behavior may differ. |
| Supply Voltage | 5 V (analog and digital) | 5 V (analog and digital) | Matching supply requirements simplifies power-rail design; both operate from a single 5 V supply, easing direct substitution in the power domain. |
| Package / Mounting | SOIC-8 (surface mount) | SOIC-20 (surface mount) | Different package footprints and pin counts mean the parts are not drop-in replacements; PCB layout must accommodate the specific package. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical temperature ratings indicate both are suited to the same industrial environments, so thermal constraints do not differentiate them. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1252U/2K5 | ADS1250UG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| Number of Bits | 24 | 20 |
| Sampling Rate(Per Second) | 40k | 25k |
| Number of Inputs | 1 | 1 |
| Input Type | Differential | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | ADC | PGA-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 |
| Features | - | PGA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the ADS1252U/2K5 and the ADS1250UG4?
The ADS1252U/2K5 is a 24-bit delta-sigma ADC with a fixed 40kSPS data rate, while the ADS1250UG4 is a 20-bit delta-sigma ADC with a fixed 25kSPS data rate. The ADS1252U/2K5 offers higher resolution and faster throughput, whereas the ADS1250UG4 provides 20-bit resolution at a lower output rate. Both are single-channel devices with a similar architecture but differ in resolution, speed, and package marking conventions.
Are the ADS1252U/2K5 and ADS1250UG4 pin-compatible?
No. The ADS1252U/2K5 is supplied in a 16-pin SOIC package (U suffix), while the ADS1250UG4 is supplied in a 16-pin SOIC package as well but with different pin functions and internal configuration. The two devices are not drop-in replacements; pin assignments and external component requirements differ, so the datasheets must be consulted before any substitution.
What is the resolution and data rate of each device?
The ADS1252U/2K5 provides 24-bit resolution with a fixed 40kSPS output data rate. The ADS1250UG4 provides 20-bit resolution with a fixed 25kSPS output data rate. Both use delta-sigma modulation and are intended for precision measurement applications where low noise and high linearity are required.
Do both devices support the same supply voltage range?
Yes, both the ADS1252U/2K5 and ADS1250UG4 operate from a single +5V analog supply (typically +4.75V to +5.25V) with a separate digital supply. Designers should verify the exact recommended operating conditions in the respective manufacturer datasheets, as decoupling and reference requirements may differ between the two parts.
Which device is better suited for higher-resolution precision measurement?
The ADS1252U/2K5 is better suited for higher-resolution precision measurement because it provides 24-bit resolution compared with the 20-bit resolution of the ADS1250UG4. However, the ADS1252U/2K5 also has a higher fixed data rate of 40kSPS, so system-level noise, reference quality, and signal conditioning must be evaluated to achieve the full 24-bit performance.
Can the ADS1250UG4 be used as a replacement for the ADS1252U/2K5 in an existing design?
Not directly. Although both are single-channel delta-sigma ADCs in 16-pin SOIC packages, they differ in resolution (20-bit vs 24-bit), data rate (25kSPS vs 40kSPS), and pin configuration. A replacement would require verifying the digital interface timing, reference requirements, and PCB layout against the ADS1250UG4 datasheet, and may require firmware changes to accommodate the different output word length and data rate.
What are the package and ordering code differences between the two parts?
The ADS1252U/2K5 is ordered in a 16-pin SOIC package with a 2,500-unit reel (the /2K5 suffix indicates tape-and-reel quantity). The ADS1250UG4 is ordered in a 16-pin SOIC package with the G4 suffix indicating Pb-free/RoHS-compliant construction. Buyers should confirm the exact package drawing, moisture sensitivity level, and RoHS status from the manufacturer's official datasheet or authorized distributor listing before ordering.