ADS1212U - 22-Bit 6.25 kSPS ADC | Texas Instruments
料号： ADS1212U ✗ 停产ADS1212U 概述
A delta-sigma ADC is a type of analog-to-digital converter that uses continuous-time sigma-delta modulation and digital filtering to provide high resolution, excellent noise performance, and wide dynamic range. The ADS1212U belongs to the broader precision ADC hierarchy, where it supports measurement systems that require more accuracy than ordinary general-purpose converters while retaining a straightforward serial interface.
The primary features include one differential input channel, 22-bit effective resolution, and operation from a single +5 V supply. Its flexible synchronous serial interface is SPI compatible and also supports a two-wire control mode intended to reduce implementation cost in low-cost isolation arrangements. A conversion rate of up to 6.25 kSPS makes the converter suitable for instrumentation that must capture relatively slow, high-accuracy measurements.
Internally, the device uses a delta-sigma architecture to achieve wide dynamic range and 22-bit no-missing-code performance. Its differential input structure helps reject common-mode noise when the source is close to the converter's analog ground. The serial interface provides a compact solution for communicating conversion results to a microcontroller, digital controller, or industrial measurement system.
Typical applications include smart transmitters, industrial process-control loops, weigh scales, chromatography systems, portable instrumentation, and low-level pressure or temperature measurement. Differential excitation is particularly useful with bridge sensors and other transducers that generate small signals relative to their common-mode voltage.
When implementing a circuit around the ADS1212U, verify the input common-mode range, allowable differential input voltage, and external reference requirements against the manufacturer datasheet. Provide a quiet +5 V supply, decouple the analog and digital sections appropriately, and route the differential input pair symmetrically to reduce conversion errors and noise pickup.
This product record combines manufacturer specifications, distributor availability information, package details, pricing evidence, verified alternatives, and application-specific design guidance. It is intended to help engineers evaluate the ADS1212U for precision measurement systems while separately checking any replacement against pinout, interface timing, input range, reference voltage, and acquisition requirements.
直接替换替代料： ADS1212U ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ADS1212U （相同外形与封装尺寸） ——差异在于 Supply Voltage, Mounting Type, Architecture, Effective Resolution, Package.
AD7793BRUZ
✅ 直接替换联系询价
查看数据手册 →MCP3561
✅ 直接替换📋 参考替代料（不在目录中）
ADS1212U 最大额定值与电气特性
| ADC Type | Delta-sigma analog-to-digital converter |
| Advertised Resolution | 22 bit |
| Internal ADC Resolution | 24 bit |
| No-Missing-Code Performance | 22 bit |
| Maximum Conversion Rate | 6.25 kSPS |
| Input Channel Count | 1 |
| Input Type | Differential |
| 电源电压 | 5 V |
| Supply Configuration | Single supply |
| Digital Interface | SPI-compatible synchronous serial interface and two-wire control mode |
| 封装 | 8-SOIC |
| Package Pin Count | 8 pins |
| 安装类型 | Surface mount |
ADS1212U 8 pins 引脚配置指南
ADS1212U（8 pins 封装）的引脚配置。 该模拟元件具有输入、输出和电源引脚。请参阅制造商数据手册以了解失调调零、补偿和使能引脚配置。适用于信号调理和放大器电路。
暂无详细引脚数据： ADS1212U.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ADS1212U 适用于 6 应用s: Industrial Process Control, Smart Transmitters, Precision Weigh Scales, Pressure and Temperature Measurement, Chromatography Systems, Portable Instrumentation.
Industrial Process Control
The ADS1212U is suitable for slow industrial process measurements where high resolution is more valuable than high sampling bandwidth. Its single differential input can monitor a low-level sensor signal, while the 22-bit no-missing-code performance preserves fine changes that may be obscured by noise or quantization. The 6.25 kSPS maximum rate supports periodic control-loop updates rather than fast transient capture. A practical implementation would place the converter close to the sensor, use a low-noise +5 V source, and verify the operating common-mode and differential ranges against the manufacturer datasheet.
推荐
Smart Transmitters
The ADS1212U fits smart-transmitter front ends that digitize small differential signals before transmitting measurement data. Its differential input structure is useful when the transducer is referenced to a common-mode voltage that may vary, while the 22-bit resolution supports fine process measurements. The converter's 6.25 kSPS rate is appropriate for continuously updated flow, pressure, or level information. Board design should use short, symmetric input routing, solid grounding, and verified protection components so switching transients do not exceed the datasheet input limits.
推荐
Precision Weigh Scales
The ADS1212U is appropriate for load-cell instrumentation that prioritizes resolution and stable differential measurements rather than rapid transient sampling. A load cell commonly produces a small differential signal on a substantial common-mode voltage, matching the converter's differential-input architecture. The 22-bit no-missing-code performance can support fine force measurement, while the 6.25 kSPS rate is sufficient for periodic display and calibration updates. The final system still requires mechanical stability, careful excitation routing, and gain settings verified from the complete manufacturer data.
推荐
Pressure and Temperature Measurement
The ADS1212U can serve as the measurement converter in pressure or temperature instruments that use ratiometric or bridge-based differential sensors. Its 22-bit resolution helps retain useful information from millivolt-level signals, while the single differential input reduces the need for duplicated analog channels. The maximum 6.25 kSPS data rate is more than adequate for slowly changing temperature or process-pressure variables. Designers should confirm the sensor excitation scheme, common-mode operating region, input filtering, and reference stability against the manufacturer electrical-characteristics tables.
推荐
Chromatography Systems
The ADS1212U is applicable to chromatography instrumentation that digitizes comparatively slow detector outputs with high resolution. The manufacturer's family description specifically identifies chromatography among the target applications, supporting use where accurate amplitude measurement is required but high-frequency waveform capture is not. The 22-bit no-missing-code performance can preserve small detector variations, and the flexible serial interface provides a compact connection to a digital control path. Board placement and filtering should address the detector's noise characteristics while preserving the required conversion bandwidth.
推荐
Portable Instrumentation
The ADS1212U can support portable measurement instruments that acquire high-resolution sensor data at moderate rates. The 8-SOIC package supports compact board construction, and the device's low-rate delta-sigma conversion is appropriate for portable scales, handheld analyzers, and field probes rather than high-bandwidth acquisition. The single +5 V supply simplifies power architecture, while the differential input helps reject noise in cable-connected sensors. A practical design must verify available power, ground partitioning, input protection, and connector-related noise before finalizing the portable instrument configuration.
推荐
推荐产品汇总
工程参考数据： ADS1212U ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | AD7793 | MCP3561 |
|---|---|---|---|
| Brand | Texas Instruments | Analog Devices | Microchip Technology |
| Package | 8-SOIC | 8-SOIC | 8-SOIC |
关键差异点
- Verified precision-converter positioning （对比 AD7793)
- 22-bit no-missing-code performance （对比 MCP3561)
- Documented interface flexibility （对比 AD7793)
设计说明
Route the differential analog input as a short, symmetrical pair with a continuous ground reference beneath or beside the pair. The verified sources confirm a differential-input architecture but do not provide a complete recommended-layout drawing, so consult the manufacturer application guidance before fixing trace geometry. Keep digital interface traces away from the input nodes, especially when the source is a low-level bridge or thermocouple-style transducer.
Provide a stable single +5 V supply and decouple the device close to its supply pins using the capacitance and placement required by the manufacturer datasheet. The verified data identifies a single +5 V supply but does not specify a recommended capacitor value, ESR range, or application schematic. These details must not be guessed; obtain them from the authoritative application information before releasing the PCB layout.
Do not treat the ADS1212U, ADS1212P, ADS1213, ADS1211, or ADS1210 as interchangeable solely because their names are similar. Confirm the package, every pin function, input common-mode range, reference configuration, supported data rate, and serial timing. Also verify the ordering suffix: the $14.4165 verified listing applies to ADS1212U/1K, while the target record is ADS1212U.
合规信息
The verified sources do not provide explicit compliance declarations for the ADS1212U. A TI forum result states that the ADS1212U uses a lead-free NiPdAu finish, but the compliance status of the complete product and package remains unverified. AEC-Q100 is not applicable to the standard commercial ordering code ADS1212U.
