Part A
ADS1252U/2K5
Texas Instruments
- Lifecycle
- Active
- Stock
- 6702 Stückzahl
- Package
- SOIC-8
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1252U/2K5 and ADS1286UA are not drop-in replacements for one another. Although both are single-channel delta-sigma ADCs from Texas Instruments, they differ in resolution, sample rate, serial interface protocol, and package footprint, so a direct board-level substitution is not possible without redesign.
Different resolution
Different sample rate
Different interface protocol
Different package footprint
Parts at a glance
Part B
ADS1286UA
Texas Instruments
- Lifecycle
- Active
- Stock
- 51 Stückzahl
- Package
- SOIC-8
- Series
- Datenerfassung mit 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 | ADS1286UA | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 12 | Resolution determines the smallest signal change the ADC can distinguish; a 24-bit device offers far finer measurement granularity than a 12-bit device. |
| Architecture | Delta-Sigma | SAR | Delta-sigma converters excel at high-resolution low-frequency signals, while SAR converters offer faster conversion and lower latency; architecture affects noise, speed, and application fit. |
| Sample Rate (max) | 40 kSPS | 20 kSPS | Maximum sample rate limits the bandwidth of signals that can be digitized; a higher rate supports faster-changing inputs. |
| Number of Input Channels | 1 (differential) | 1 (differential) | Channel count and configuration determine how many signals can be measured and whether differential or single-ended inputs are supported. |
| Interface | SPI (serial) | SPI (serial) | The digital interface must match the host controller; both use SPI, easing drop-in compatibility at the system level. |
| Supply Voltage | 5 V (analog and digital) | 5 V (analog and digital) | Supply voltage compatibility ensures the part operates within the existing power rail of the design. |
| Package | SOIC-8 | SOIC-8 | Package footprint must match the PCB layout for physical substitutability; identical packages simplify replacement. |
| Input Type | Differential | Differential | Differential inputs improve common-mode noise rejection, which is important for precision measurement in noisy environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1252U/2K5 | ADS1286UA |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Active |
| Number of Bits | 24 | 12 |
| Sampling Rate(Per Second) | 40k | 20k |
| Number of Inputs | 1 | 1 |
| Input Type | Differential | Differential |
| Data Interface | SPI | SPI |
| Configuration | ADC | S/H-ADC |
| Ratio - S / H: ADC | - | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | SAR |
| 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 architectural differences between the ADS1252U/2K5 and the ADS1286UA?
The ADS1252U/2K5 is a 24-bit delta-sigma analog-to-digital converter with a fixed data rate of 41.7 kSPS and a serial interface, supplied in an SOIC-8 package. The ADS1286UA is a 12-bit successive-approximation-register (SAR) ADC with a maximum sampling rate of 20 kSPS and an SPI-compatible serial interface, also supplied in an SOIC-8 package. The two devices differ fundamentally in resolution, conversion architecture, and throughput.
Are the ADS1252U/2K5 and ADS1286UA pin-compatible?
No. Although both devices are offered in an 8-pin SOIC package, their pin functions differ. The ADS1252U/2K5 provides a dedicated clock input, a single differential analog input pair, and a two-wire serial data output, while the ADS1286UA provides a chip-select, serial clock, and serial data input/output arrangement for its SPI interface. Pin functions and the PCB land pattern connections must be verified against the respective manufacturer datasheets before any layout substitution is considered.
Can the ADS1286UA be used as a direct drop-in replacement for the ADS1252U/2K5?
No. The ADS1286UA is a 12-bit SAR converter with a maximum 20 kSPS throughput, whereas the ADS1252U/2K5 is a 24-bit delta-sigma converter operating at 41.7 kSPS. The resolution, conversion architecture, interface protocol, and pin functions are not equivalent, so a direct drop-in replacement is not supported without a full redesign and validation against the target application requirements.
How do the resolution and effective number of bits compare between these two converters?
The ADS1252U/2K5 provides 24-bit resolution with a delta-sigma modulator, making it suitable for high-resolution, low-frequency measurement applications. The ADS1286UA provides 12-bit resolution using a SAR architecture. The effective number of bits (ENOB) achievable in a given design depends on the input signal, reference, and noise environment, and should be evaluated from the respective datasheet specifications rather than assumed from the nominal resolution alone.
What are the maximum sampling rates of the ADS1252U/2K5 and ADS1286UA?
The ADS1252U/2K5 has a fixed output data rate of 41.7 kSPS. The ADS1286UA has a maximum sampling rate of 20 kSPS. These throughput figures are specified in the respective manufacturer datasheets and directly affect the bandwidth and signal types each converter can support.
Do both devices support the same serial interface protocol?
No. The ADS1252U/2K5 uses a simple two-wire serial interface consisting of a data output line and a clock input, with conversion results shifted out synchronously. The ADS1286UA uses an SPI-compatible interface with chip-select, serial clock, and serial data lines. Firmware and host microcontroller interface code must be adapted accordingly when migrating between the two devices.
What are the typical application differences between the ADS1252U/2K5 and ADS1286UA?
The ADS1252U/2K5, with its 24-bit delta-sigma architecture, is typically applied in precision measurement, industrial process control, weigh scales, and low-frequency sensor digitization where high resolution is required. The ADS1286UA, with its 12-bit SAR architecture and 20 kSPS throughput, is typically applied in general-purpose data acquisition, portable instrumentation, and control loops where moderate resolution and faster settling are sufficient. Selection should be based on the resolution, speed, and interface requirements of the specific design.
What supply voltage and reference requirements apply to each device?
Both devices operate from a single 5 V analog supply and require an external voltage reference for their conversion. The ADS1252U/2K5 and ADS1286UA each specify their reference input range and supply tolerances in their respective manufacturer datasheets. Designers must confirm the exact supply and reference conditions, including decoupling and reference drive requirements, from the official datasheet before finalizing a design.