ADS1252U - 24-Bit 40kHz Sigma-Delta ADC | Texas Instruments
部品番号: ADS1252U ✗ 生産終了ADS1252U 概要
What is a sigma-delta ADC? A sigma-delta analog-to-digital converter uses a delta-sigma modulator and digital decimation filtering to oversample the analog input and shape quantization noise. The ADS1252U is therefore a precision ADC in the broader semiconductor hierarchy: data converter > analog-to-digital converter > sigma-delta ADC. Its 24-bit nominal resolution, 19-bit effective resolution and differential input support are useful for low-bandwidth industrial instrumentation where signal amplitude and resolution matter more than maximum sampling rate.
Key features include 24-bit resolution, operation up to 40 kHz, one differential input and a single +5 V supply. The manufacturer describes the device as providing no missing codes across its 24-bit conversion range, while the 2.5 ppm RMS noise specification identifies it as a high-resolution measurement converter rather than a general-purpose flash or SAR ADC. The SPI-compatible serial interface and external clock arrangement provide a straightforward connection to microcontrollers, DSPs and programmable logic.
The ADS1252U is suited to precision current sensing, pressure transducer acquisition, strain-gauge measurement, industrial process monitoring and low-frequency sensor instrumentation. Differential input handling helps reject common-mode noise when the measured source is balanced or when the analog front end uses a differential amplifier. The 40 kSPS maximum conversion rate is appropriate for many industrial control and monitoring loops, but it is not intended for high-frequency waveform capture.
Designers should pay close attention to analog input common-mode range, reference voltage, input filtering, clock jitter and layout grounding. The analog and digital sections should be separated thoughtfully, and the datasheet reference and bypass connections should be placed according to the manufacturer layout guidance. External filtering can limit bandwidth and reduce out-of-band delta-sigma modulation noise before the digital decimation stage.
This product page consolidates the verified manufacturer specifications, observed distributor pricing, sourcing information and practical design guidance. It also distinguishes the confirmed ADS1252U ordering information from broader functional alternatives, helping engineers avoid treating a merely similar ADC as a guaranteed pin-to-pin replacement.
ドロップイン代替品: ADS1252U — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
ADS1251U
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADS1250U
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADS1252U 最大定格＆電気的特性
| 分解能 | 24 bits |
| Maximum Conversion Rate | 40 kSPS |
| Effective Resolution | 19 bits up to 40 kHz |
| RMS Noise | 2.5 ppm RMS |
| Architecture | Delta-sigma |
| Input Type | 1 differential input |
| 電源電圧 | Single +5 V |
| No Missing Codes | 24 bits |
| パッケージ | 8-pin SOIC |
| 実装タイプ | Surface mount |
| インターフェース | SPI-compatible serial interface |
| External Clock | Two clock pins indicated in TI E2E discussion |
| RoHS ステータス | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | not_applicable |
ADS1252U 8-pin soic ピン配置ガイド
ADS1252U (8-pin soic パッケージ) のピン配置。 このアナログコンポーネントは、入力、出力、および電源ピンを備えています。オフセットナル、補償、イネーブルピンの設定については、メーカーのデータシートを参照してください。信号調整やアンプ回路に最適です。
詳細なピン配置データはありません: ADS1252U.
詳細は データシート をご参照ください。
主な用途
ADS1252U の用途: 6 件s: Industrial Pressure Transducer Acquisition, Load Cell and Strain Gauge Measurement, Precision Current Sensing, Battery and Power-System Monitoring, Laboratory and Process Instrumentation, Environmental and Sensor Signal Acquisition.
Industrial Pressure Transducer Acquisition
The ADS1252U fits precision pressure-transducer measurement because it combines 24-bit nominal resolution with 19-bit effective resolution, equivalent to 2.5 ppm RMS noise, at conversion rates up to 40 kHz. Its single differential input can accept a bridge or instrumentation-amplifier output when the source is balanced. The converter should be placed close to the analog front end, with an antialias filter selected for the required pressure bandwidth. Reference stability and low-noise analog filtering are as important as clocking when the target is accurate pressure readings.
おすすめ
Load Cell and Strain Gauge Measurement
The ADS1252U is appropriate for load-cell and strain-gauge bridges where low-frequency differential signals require high resolution. Its 24-bit conversion resolution and 40 kSPS maximum rate provide ample conversion speed for weighing, force measurement and test equipment, while differential input acquisition helps suppress common-mode voltage. The bridge output, excitation supply and ADC input network must remain within the verified analog common-mode range. Reference accuracy, excitation stability and input filtering should be evaluated together before claiming system-level measurement accuracy.
おすすめ
Precision Current Sensing
The ADS1252U can acquire low-bandwidth current measurements from shunt resistors, current transformers or sensor front ends when high nominal resolution is valuable. Its differential input supports measurement of the voltage across a shunt, and its effective resolution of 19 bits at rates up to 40 kHz is more appropriate than a high-speed ADC for slowly changing current. A differential amplifier may be used to shift the shunt signal into the converter's allowed common-mode range. Kelvin routing and a dedicated ground return help prevent copper and return-path voltage from becoming measurement error.
おすすめ
Battery and Power-System Monitoring
The ADS1252U is suitable for slow battery, supply and power-rail monitoring where fine resolution is required but the signals of interest have limited bandwidth. Its 24-bit nominal resolution can represent small changes in voltage or current, and the 40 kSPS maximum rate supports filtering and oversampling. Use the differential input for a scaled shunt signal and include protection appropriate to the power system. The converter's single +5 V supply requirement means the monitored system may need a dedicated regulated analog rail if the measured bus voltage is outside that range.
おすすめ
Laboratory and Process Instrumentation
The ADS1252U supports laboratory instruments and industrial process monitors that acquire slowly varying sensor signals with high resolution. A conversion rate of up to 40 kHz allows the digital filter to average noise while retaining useful control-loop responsiveness, and the SPI-compatible interface can connect to a microcontroller or DSP for configuration and data retrieval. Practical implementations should limit analog bandwidth before the converter, provide a low-noise reference, and use the digital output-rate and filtering settings recommended by the manufacturer.
おすすめ
Environmental and Sensor Signal Acquisition
The ADS1252U can serve as the conversion stage for temperature, humidity, gas and other high-resolution environmental sensor interfaces. Its 24-bit nominal resolution is useful when the sensor output is small and the measurement bandwidth is low, while the differential input can simplify connection to balanced sensor amplifiers. The analog front end must keep the signal within the input common-mode range and provide filtering appropriate to sensor noise and conversion speed. Reference drift, self-heating and grounding should be checked when long-term measurement accuracy matters.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: ADS1252U — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | ADS1251U | ADS1250U |
|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
主な差別化要因
- 24-bit nominal resolution （vs ADS1251U)
- 40 kSPS maximum conversion rate （vs ADS1250U)
- Single differential input architecture （vs ADS1251U)
設計ノート
Keep the ADS1252U reference, bypass and analog input paths compact and place decoupling capacitors at the device pins. Route the differential input as a matched pair where practical, and keep digital clock and serial-interface return current away from the analog input and reference nodes. The verified source does not provide the complete recommended layout, so use the TI datasheet land pattern and application guidance rather than relying on generic SOIC placement rules.
The converter reaches 19-bit effective resolution with 2.5 ppm RMS noise up to 40 kHz, so excessive analog bandwidth can introduce noise that is not removed by the intended decimation filter. Select an input filter based on the required sensor bandwidth and the converter's supported data rates. Also evaluate clock quality: the TI E2E source discusses a 16 MHz clock example, but the full datasheet must be used to confirm clock amplitude, frequency limits and timing requirements.
The ADS1252U operates from a single +5 V supply, but that does not imply that every analog or digital rail can be connected indiscriminately. Verify the permitted AVDD and DVDD combinations, decoupling values and sequencing conditions in the manufacturer datasheet. For systems using a monitored bus above 5 V, create a protected low-noise 5 V analog rail or use an appropriate front end; do not infer a usable input range from the ADC supply rating.
Do not treat a similar resolution, package or converter family as proof of replacement compatibility. For ADS1251U and ADS1250U, verify every analog pin, digital pin, supply level, clock arrangement and timing parameter against the ADS1252U datasheet. Check the input common-mode range against the actual sensor output, and include reference error and gain drift when calculating system accuracy. These checks are especially important when substituting a part into an existing board without redesign.
コンプライアンス情報
The supplied verified snippets mention comparison tools covering RoHS and REACH, but do not provide explicit compliance results for ADS1252U. AEC-Q100 is not applicable because the product is a precision analog-to-digital converter rather than an automotive-qualified device.
