ADS7819U - 12-Bit 800 kSPS SAR ADC | Texas Instruments
部品番号: ADS7819U ✗ 生産終了ADS7819U 概要
An ADC is a semiconductor that converts an analog voltage into a digital code for processing, measurement, or control. The ADS7819U belongs to the successive-approximation ADC, data-converter, and analog-to-digital converter hierarchy. Its parallel output can connect directly to suitable microprocessor or digital logic circuitry, while the internal sample-and-hold function supports acquisition of rapidly changing input signals.
Key features include 12-bit resolution, an 800 kSPS sampling rate, a ±2.5 V input range, and a 1.25 µs throughput time. The device also provides an internal reference and parallel data outputs with latches. The industrial temperature grade supports operation from -40 °C to +85 °C. These characteristics balance conversion speed, digital interface simplicity, and analog measurement capability for embedded acquisition systems.
The converter uses a capacitor-based SAR conversion structure with an inherent sample-and-hold input stage. A complete conversion sequence requires the converter to compare the sampled input against an internal successive-approximation DAC and test successive bit weights. The resulting 12-bit code is presented through parallel outputs, and three-state drivers allow the output bus to be disabled when shared by multiple converters or interface resources.
Typical applications include industrial process control, instrumentation, waveform capture, data acquisition systems, and microprocessor-controlled measurement equipment. In these systems, the ADS7819U can sample an analog sensor or conditioned signal and provide a 12-bit digital representation to a controller. Designers should account for the analog input range, source impedance, acquisition timing, reference behavior, and digital signal timing when completing the surrounding circuitry.
For layout, place input, reference, and decoupling connections close to the device and follow the pin-description table in the manufacturer datasheet when assigning PCB tracks. The parallel interface requires careful routing to avoid timing skew, especially when converter outputs feed a higher-speed processor or shared bus. The 28-pin SOIC outline also allows assembly methods commonly used for industrial and instrumentation equipment.
This page combines the ADS7819U specifications, packaging information, comparison considerations, and practical implementation guidance for engineers evaluating high-speed parallel-interface ADCs.
ドロップイン代替品: ADS7819U — 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: ADS7819U （同一形状・フットプリント） — 相違点: Clock, Package, Reference, Resolution, Sample-and-Hold.
ADS7810U/1KG4
✅ 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 →ADS7810U/1KG4
✅ 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 →ADS7819U 最大定格＆電気的特性
| 分解能 | 12 bit |
| サンプリングレート | 800 kSPS |
| Throughput Time | 1.25 µs |
| Analog Input Range | ±2.5 V |
| Converter Architecture | Successive-approximation SAR |
| Converter Type | Sampling ADC |
| Channel Count | 1 channel |
| Output Interface | Parallel microprocessor interface |
| Output Code | 2's complement binary |
| Reference | Internal reference |
| Clock | Internal clock |
| Sample-and-Hold | Inherent sample-and-hold |
| Output Drivers | Three-state output drivers |
| 動作温度範囲 | -40 °C to +85 °C |
| パッケージ | 28-pin SOIC |
| Package Code | SOP |
| Terminal Form | Gull wing |
| Temperature Grade | Industrial |
ADS7819U sop ピン配置ガイド
ADS7819U (sop 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: ADS7819U.
詳細は データシート をご参照ください。
主な用途
ADS7819U の用途: 6 件s: Industrial Process Measurement, Data-Acquisition Systems, Instrumentation and Signal Conditioning, Waveform Monitoring, Microprocessor-Controlled Measurement, Conditioned Sensor Acquisition.
Industrial Process Measurement
The ADS7819U is appropriate for digitizing conditioned industrial process signals when a system needs 12-bit resolution and rapid sequential sampling. Its 800 kSPS sampling rate and 1.25 µs throughput time allow the converter to capture changing sensor information more quickly than a low-rate general-purpose ADC. The ±2.5 V input range requires scaling and protection at the analog front end, while the parallel interface allows direct connection to suitable industrial controller logic. Use an anti-alias filter and verify source settling time before sampling rapidly changing signals.
Data-Acquisition Systems
The ADS7819U can serve as the core conversion element in a parallel-interface data-acquisition system requiring 12-bit values at up to 800 kSPS. Its internal reference, clock, sample-and-hold stage, and three-state output drivers reduce the number of external support functions. The converter's 1.25 µs throughput time supports high-rate acquisition, but the system must account for bus timing, output loading, and analog settling. A processor with compatible parallel input timing is the natural destination for the latched conversion results.
Instrumentation and Signal Conditioning
The ADS7819U fits instrumentation front ends that measure bipolar analog signals after level shifting or amplification. Its ±2.5 V range accommodates centered sensor signals, and its 12-bit resolution provides 4096 digital codes across the stated analog span. The 800 kSPS capability is valuable when the instrument samples repetitive or transient waveforms rather than only slow process values. Place the input-conditioning network close to the converter and include filtering that balances anti-alias requirements against the desired signal bandwidth.
Waveform Monitoring
The ADS7819U is well suited to waveform monitoring because its 800 kSPS sampling rate and 12-bit resolution provide a practical combination of time and amplitude resolution. The 1.25 µs throughput time supports rapid acquisition of recurring waveforms, while the parallel outputs can feed a capture buffer or dedicated logic. Designers should select an input bandwidth appropriate for the sample rate, maintain a stable common-mode and reference environment, and account for conversion-time and output-update timing when interpreting captured samples.
Microprocessor-Controlled Measurement
The ADS7819U works well when a microprocessor or programmable controller requires direct access to 12-bit conversion data. Its parallel microprocessor interface avoids the serial overhead associated with many compact ADCs, and the three-state output drivers provide controlled bus participation. The system designer must define conversion-start timing, data capture timing, and bus ownership around the device's documented behavior. Use the manufacturer timing diagrams and pin descriptions to establish a deterministic read sequence.
Conditioned Sensor Acquisition
The ADS7819U can acquire outputs from sensors whose analog signals are conditioned into the converter's ±2.5 V range. Its 800 kSPS rate is useful for fast-changing variables, while 12-bit resolution supports digital monitoring and control decisions. The analog front end should perform sensor biasing, amplification or attenuation, filtering, and overvoltage protection without introducing nonlinear loading. Confirm the converter's acquisition requirements and calculate the required op-amp settling behavior before operating near the maximum sampling rate.
エンジニアリング参考データ: ADS7819U — 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 | ADS7810U | ADS7810U/1K |
|---|---|---|---|
| Package | 28-pin SOIC | 28-pin SOIC | 28-pin SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 12 bit | 12 bit | 12 bit |
主な差別化要因
- Higher documented sampling performance than the listed same-package replacement candidate （vs ADS7810U)
- Native 12-bit parallel conversion with integrated support functions （vs ADS7810U)
- Documented industrial temperature range （vs ADS7810U/1K)
設計ノート
Use the ADS7819 datasheet pin-description table and package drawing for the exact 28-pin SOIC layout. Keep the analog input and reference connections short, place decoupling capacitors close to their associated pins, and route the 12 parallel output lines away from sensitive analog nodes. Confirm polarity, control-signal directions, and output states before committing the PCB layout.
Parallel output timing is sensitive to bus loading and trace length. Model the receiving logic's input capacitance, use a consistent signal-ground reference, and avoid long stubs between the converter and capture registers. Verify data setup and hold requirements using the manufacturer timing diagram, especially when operating at the documented 800 kSPS sampling rate.
Do not treat the ±2.5 V input range as permission to apply arbitrary bipolar or overvoltage signals directly to the converter. Include scaling, attenuation, and protection, and analyze the settling behavior of the signal source and front-end amplifier. A front-end error that is not settled when sampling begins can corrupt the conversion even though the converter itself is operating at the intended rate.
Keep the analog input path compact and use a defined return path beneath or alongside the signal route. If the ADC is placed near a switching supply or digital processor, separate noisy power and return currents from the reference and input nodes. An anti-alias filter should be chosen for the system bandwidth rather than added only after observing sampled noise.
コンプライアンス情報
The available technical listings identify the industrial temperature grade, 28-pin SOIC package, converter architecture, and electrical characteristics but do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status.