ADS7822U - 12-Bit 200kSPS Micro-Power ADC | TI
部品番号: ADS7822U ✓ 生産中ADS7822U 概要
A sampling ADC is a data-converter category that acquires an analog voltage through successive approximation and converts it into a digital value. In the product hierarchy, the ADS7822U is a sampling ADC, which is a type of ADC and a semiconductor interface device used to bridge physical analog signals and digital processing systems.
The principal specifications are 12-bit conversion resolution, a maximum sampling rate of 200kSPS, and operation from 2.7V to 5.25V. The converter also features a low-power shutdown state with a maximum power-down current of 3µA. These characteristics make the device suitable for portable measurement systems, industrial controls, and embedded equipment that must balance conversion speed, resolution, and energy use.
The ADS7822 uses a serial interface to exchange conversion commands and digital results with a host microcontroller or processor. Its single-input architecture keeps the interface and board requirements compact. Because it is a sampling converter rather than a continuous-time converter, acquisition timing, source settling, reference stability, and digital-interface timing remain important parts of achieving accurate results at high conversion rates.
Typical applications include industrial pressure and temperature monitoring, laboratory sensor acquisition, programmable test equipment, and low-power embedded data logging. The 8-pin SOIC package is straightforward to assemble on conventional through-hole-style PCB land patterns and is smaller than many higher-channel-count mixed-signal systems. The 200kSPS rate provides practical margin for monitoring signals that do not require continuous waveform capture.
Designers should verify the analog input range against the selected reference voltage, allow the source and front end to settle before conversion, and place bypass capacitors close to the supply pins. A clean reference and appropriately shielded analog layout are equally important because they directly influence the stability and repeatability of the 12-bit conversion result.
This page consolidates verified manufacturer and distributor information, technical design guidance, application suitability, and same-package replacement candidates. It also identifies parameters for which the supplied source material does not provide sufficient detail, allowing engineers to distinguish documented facts from data that still requires datasheet confirmation.
ドロップイン代替品: ADS7822U — 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。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: ADS7822U （同一形状・フットプリント） — 相違点: Package, Sampling Rate, Number of Input Channels, Power-Down Current, RoHS Status.
ADS7816UB/2K5G4
✅ ドロップイン価格はお問い合わせください
データシートを見る →ADS7825PG4
✅ ドロップイン ⚠️ 仕様未検証価格はお問い合わせください
データシートを見る →ADS7822UG4
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADS7822U 最大定格＆電気的特性
| Converter Type | Sampling analog-to-digital converter |
| Architecture | Successive-approximation converter (SAR) |
| 分解能 | 12 bit |
| Maximum Sampling Rate | 200 kSPS |
| Number of Analog Inputs | 1 input |
| Number of Channels | 1 channel |
| Supply Voltage Range | 2.7 V to 5.25 V |
| Digital Interface | Serial interface |
| Power-Down Current | 3 µA maximum |
| 動作温度範囲 | -40°C to +85°C |
| パッケージ | 8-pin SOIC |
| Package Type | SOIC (D) |
| ピン数 | 8 pins |
| 実装タイプ | Surface mount |
| Converter Technology | Successive approximation |
ADS7822U soic (d) ピン配置ガイド
ADS7822U (soic (d) 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: ADS7822U.
詳細は データシート をご参照ください。
主な用途
ADS7822U の用途: 6 件s: Industrial Sensor Acquisition, Battery-Powered Data Logging, Programmable Test Equipment, Temperature and Pressure Monitoring, Embedded Control Loops, Portable Environmental Monitoring.
Industrial Sensor Acquisition
The ADS7822U fits industrial sensor acquisition because it combines 12-bit resolution, a 200kSPS sampling rate, and a 2.7V to 5.25V supply range in an 8-pin SOIC package. Place it after the transducer and analog front end to convert pressure, temperature, or level signals into serial digital data for a controller. Its single-input architecture keeps the signal path compact. The main design consideration is ensuring that the source settles before each conversion, while a stable reference and local supply bypassing help preserve repeatable results.
おすすめ
Battery-Powered Data Logging
The ADS7822U is suitable for battery-powered data logging because its micro-power operation and 3µA maximum shutdown current help control energy use between measurements. Its 12-bit, 200kSPS converter can capture slower sensor values without requiring a high-rate continuous conversion mode. Use shutdown when no conversion is active, connect the digital interface to a low-power microcontroller, and size the decoupling capacitors for the intended supply range of 2.7V to 5.25V. Reference stability remains important because supply or reference variation can directly affect measurement accuracy.
おすすめ
Programmable Test Equipment
The ADS7822U can serve as the measurement front end in programmable instrumentation that must digitize a controlled analog stimulus or feedback signal. Its 12-bit resolution and 200kSPS rate provide useful bandwidth for many process-control and bench-test loops. The 8-pin SOIC package supports compact analog boards, while the serial interface permits direct connection to a test controller. Designers should use a low-noise reference, protect the analog input from switching-node interference, and verify acquisition and conversion timing in the manufacturer datasheet.
おすすめ
Temperature and Pressure Monitoring
The ADS7822U is appropriate for temperature and pressure monitoring systems that require more than a simple threshold detector but do not need waveform capture. Its 12-bit resolution provides 4096 digital codes, and the 200kSPS conversion rate allows the system to refresh sensor readings quickly. Connect the conditioned bridge or thermistor signal to the single analog input, operate the converter within 2.7V to 5.25V, and use a stable reference. Calibration may be needed to compensate for sensor nonlinearity, offset, and system gain error.
おすすめ
Embedded Control Loops
The ADS7822U can digitize feedback or supervisory signals in an embedded control system where 12-bit resolution and a 200kSPS sampling capability are useful. Its single analog input and 8-pin SOIC package reduce the space required for a dedicated conversion channel, while the serial interface supports connection to a microcontroller. Keep the converter's analog section separated from noisy switching circuitry and confirm that the control loop can tolerate the conversion latency. For multiple channels, a multiplexer or a multi-channel ADC may provide a more efficient solution.
おすすめ
Portable Environmental Monitoring
The ADS7822U supports portable environmental monitoring by combining a compact 8-pin SOIC package, 12-bit conversion resolution, and low-power operation. It can digitize signals from air-quality, soil-moisture, light, or ambient-temperature sensors through a suitable analog front end. Its 2.7V to 5.25V operating range supports common embedded supply systems. For battery-powered deployments, use the 3µA maximum power-down state between samples, minimize trace leakage around the analog input, and verify sensor settling time against the available acquisition window.
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: ADS7822U — 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 | ADS7816U | ADS7825 | ADS7822UG4 |
|---|---|---|---|---|
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 12 bit | 12 bit | 16 bit | 12 bit |
| Sampling Rate | 200 kSPS | 200 kSPS | 200 kSPS | 200 kSPS |
| Analog Input Count | 1 input | 1 input | 1 input | 1 input |
| Digital Interface | Serial interface | Serial interface | Serial interface | Serial interface |
主な差別化要因
- Lower resolution than the 16-bit family option （vs ADS7825)
- Directly documented same-package high-speed ADC option （vs ADS7816U)
- Closest same-family alternative （vs ADS7822UG4)
設計ノート
Route the analog input and reference connections away from switching regulators, relay drivers, and high-current digital returns. Place the converter's supply-bypass capacitor adjacent to the supply and ground pins, and use the shortest practical path from the external reference to the reference pin. Because the converter provides 12-bit resolution, reference noise and ground gradients can become visible in the final measurement even when the sampling circuitry itself is correctly designed.
Do not assume that a matching 8-pin SOIC package guarantees drop-in compatibility. Verify pin numbers, analog input range, reference voltage, conversion timing, power-down behavior, and digital command protocol for every candidate. The ADS7822 family requires the analog source to settle before conversion; an amplifier or sensor that is still settling can produce repeatable but incorrect readings. Use the manufacturer's recommended application circuit and timing values rather than relying on nominal sampling-rate figures alone.
For battery-powered designs, use shutdown when conversion results are not required and account for the 3µA maximum power-down current in addition to active-supply consumption. Ensure the selected reference and analog front end also meet the sleep-mode requirements. The 2.7V to 5.25V operating range permits 3.3V and 5V systems, but logic-level compatibility must be confirmed for the serial interface. Validate the complete supply range and load-transient behavior on hardware.
コンプライアンス情報
The supplied source excerpts do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status for ADS7822U. Compliance should be confirmed from the current manufacturer product page and applicable declarations.
