Part A
ADS1252U/2K5
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 6702 個数
- Package
- SOIC-8
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1252U/2K5 and ADS1286UL are both 24-bit delta-sigma ADCs, but they differ fundamentally in resolution architecture, interface, sampling rate, and package, so the ADS1286UL cannot serve as a direct drop-in substitute for the ADS1252U/2K5 without a full board and firmware redesign.
Different output interface
Different sampling rate
Different package type
Different input configuration
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 | ADS1286UL | 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 sampling with lower latency; architecture drives the application fit. |
| Sampling Rate (max) | 41 kSPS | 20 kSPS | Maximum sample rate limits the bandwidth of signals that can be digitized and affects throughput in multiplexed or fast-changing measurement systems. |
| Input Type | Differential | Differential | Differential inputs reject common-mode noise and improve accuracy in electrically noisy environments; both parts share this beneficial input configuration. |
| Interface | SPI (serial) | SPI (serial) | A serial SPI interface reduces pin count and simplifies isolation; matching interfaces eases drop-in replacement at the digital side. |
| Supply Voltage | 5 V (single supply) | 5 V (single supply) | Supply voltage compatibility determines whether the part can be used in the same power rail without level shifting or additional regulation. |
| Package | SOIC-8 | SOIC-8 | Package footprint compatibility is essential for physical substitutability on an existing PCB layout. |
| Operating Temperature Range | -40 to +85 °C | -40 to +85 °C | The temperature range defines the environments in which the device is guaranteed to meet specifications; matching ranges support equivalent application use. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1252U/2K5 | ADS1286UL |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,Texas Instruments |
| Part Status | Active | Obsolete |
| 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 | 0°C ~ 70°C |
Frequently asked questions
What are the key architectural differences between the ADS1252U/2K5 and the ADS1286UL?
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 ADS1286UL is a 12-bit successive-approximation register (SAR) ADC with a maximum sampling rate of 20 kSPS, an SPI-compatible interface, and is supplied in a TSSOP-8 package. They differ in resolution, conversion architecture, and maximum throughput.
Can the ADS1252U/2K5 and ADS1286UL be used as direct substitutes for each other?
No. The two devices differ in resolution (24-bit vs 12-bit), conversion architecture (delta-sigma vs SAR), maximum data rate (41.7 kSPS vs 20 kSPS), package (SOIC-8 vs TSSOP-8), and pin functions. A direct drop-in replacement is not possible without redesign and validation against the respective datasheets.
What are the supply voltage requirements for each device?
The ADS1252U/2K5 operates from a single 5 V analog supply (with a separate digital supply pin) per its datasheet. The ADS1286UL operates from a single 5 V supply. Designers should confirm exact supply ranges and decoupling requirements from the respective manufacturer datasheets before layout.
How do the interface and data output formats differ between the ADS1252U/2K5 and ADS1286UL?
The ADS1252U/2K5 provides a serial output with a fixed 41.7 kSPS conversion rate and requires an external clock; data is output in a two's complement format. The ADS1286UL uses an SPI-compatible serial interface with a chip-select line and outputs 12-bit results. The host microcontroller firmware must be adapted to each protocol.
Which device is better suited for high-resolution, low-frequency measurement applications?
The ADS1252U/2K5, with its 24-bit delta-sigma architecture, is intended for high-resolution measurements of low-frequency signals. The ADS1286UL, being a 12-bit SAR converter, is better suited to lower-resolution, moderate-speed applications. Selection should be based on required resolution, noise performance, and throughput as specified in the datasheets.
Are the packages of the ADS1252U/2K5 and ADS1286UL footprint-compatible?
No. The ADS1252U/2K5 is offered in an SOIC-8 package, while the ADS1286UL is offered in a TSSOP-8 package. The package body dimensions and lead pitch differ, so the PCB land patterns are not interchangeable.
What are the operating temperature ranges for these converters?
Both the ADS1252U/2K5 and ADS1286UL are specified for industrial temperature operation. Designers should verify the exact temperature grade and specified limits in the respective manufacturer datasheets, as these parameters must not be assumed without confirmation.