ADS1252U - 24-Bit 40kHz Sigma-Delta ADC | Texas Instruments
MPN： ADS1252U ✗ 停產ADS1252U 概覽
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.
直接替換替代品，適用於 ADS1252U — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
ADS1251U
✅ 直接替換📋 參考替代品（不在目錄中）
ADS1250U
✅ 直接替換📋 參考替代品（不在目錄中）
ADS1252U 最大額定值與電氣特性
| 解析度 | 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 |
| 供應電壓 | Single +5 V |
| No Missing Codes | 24 bits |
| 封裝 | 8-pin SOIC |
| 安裝類型 | Surface mount |
| 介面 | SPI-compatible serial interface |
| External Clock | Two clock pins indicated in TI E2E discussion |
| RoHS 狀態 | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | not_applicable |
ADS1252U 8-pin soic 腳位配置指南
ADS1252U（8-pin soic 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： ADS1252U.
請參閱 資料表 以查看完整腳位配置。
典型應用
ADS1252U 適用於 6 應用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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 ADS1252U — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ADS1251U | ADS1250U |
|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
主要差異化特點
- 24-bit nominal resolution (對比ADS1251U)
- 40 kSPS maximum conversion rate (對比ADS1250U)
- Single differential input architecture (對比ADS1251U)
設計說明
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.
合規資訊
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.
