ADS7844E - 12-Bit 8-Channel 200 kHz ADC | Texas Instruments
部品番号: ADS7844E ✓ 生産中ADS7844E 概要
A sampling ADC is an analog-to-digital converter that acquires an input voltage through a sample-and-hold circuit and converts it into a digital code. The ADS7844E belongs to the ADC > data converter > integrated circuit hierarchy and is designed for compact embedded systems requiring multiple analog measurements, controlled serial output, and low power consumption. Its reference voltage can vary from 100 mV to VCC, with a corresponding input range of 0 V to VREF.
The device provides 12-bit resolution, eight single-ended or four differential inputs, and conversion throughput up to 200 kHz. Its synchronous serial interface supports communication with a microcontroller or other digital controller, while shutdown mode reduces power dissipation when conversion activity is not required. The single-supply operation and selectable reference range make the converter useful in industrial control, instrumentation, data acquisition, and embedded analog monitoring systems.
The ADS7844E uses a sampling architecture rather than a continuous-time delta-sigma or pipeline architecture. This supports relatively high throughput for a multiplexed converter while keeping the device suitable for low-power embedded designs. Input selection, reference handling, serial timing, and acquisition control are managed through the device interface and external circuitry. The application engineer must account for the settling time of the sample-and-hold network when multiplexing channels at high conversion rates.
Typical applications include touch-panel and resistive input scanning, industrial sensor interfaces, programmable gain control systems, battery-powered instrumentation, and factory automation modules. The 8-channel input arrangement is useful when several analog quantities must be measured with one converter. The 3 mW typical dissipation figure makes the part attractive for embedded systems where overall power budget and board area are constrained.
Designers should pay close attention to the reference voltage, analog input range, source impedance, acquisition timing, and serial-interface wiring. Input and reference bypassing, grounding, signal conditioning, and digital return-current management can materially affect conversion accuracy. The 20-lead SSOP package also requires adequate lead clearance and careful assembly planning during manual inspection or rework.
This product summary combines manufacturer identification, distributor package information, ADS7844 feature descriptions, and cross-reference findings. It distinguishes verified ADS7844E characteristics from unavailable detailed electrical, pricing, and pin-assignment data so engineers can make a traceable initial selection and then confirm the complete operating limits in the official Texas Instruments datasheet.
ドロップイン代替品: ADS7844E — 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: ADS7844E （同一形状・フットプリント） — 相違点: Package, Architecture, Reference Voltage Range, Resolution, RoHS Status.
ADS7844N
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX14701EWC+
✅ 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 →ADS7844E 最大定格＆電気的特性
| 分解能 | 12 bit |
| Input Channels | 8 single-ended or 4 differential |
| Maximum Throughput Rate | 200 kS/s |
| Architecture | SAR sampling ADC |
| Output Interface | Synchronous serial interface |
| Supply Type | Single supply |
| Typical Supply Voltage | +5 V |
| Reference Voltage Range | 100 mV to VCC |
| 入力電圧範囲 | 0 V to VREF |
| Typical Power Dissipation | 3 mW at 200 kHz throughput and +5 V supply |
| Shutdown Mode | Yes |
| パッケージ | 20-lead SSOP |
| 実装タイプ | Surface mount |
| Analog Input Type | Single-ended or differential |
ADS7844E 20-lead ssop ピン配置ガイド
ADS7844E (20-lead ssop 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: ADS7844E.
詳細は データシート をご参照ください。
主な用途
ADS7844E の用途: 6 件s: Industrial Sensor Acquisition, Resistive Touch Panel Control, Programmable Instrumentation, Factory Automation Control, Battery-Powered Data Acquisition, Portable Environmental Monitoring.
Industrial Sensor Acquisition
The ADS7844E fits industrial sensor acquisition because its eight single-ended inputs can monitor several analog sensors, while four differential channels can reject common-mode noise when required. Texas Instruments specifies 12-bit resolution, 200 kS/s throughput, and a synchronous serial interface. Place the converter behind suitable input conditioning and protect every channel against transients. The 100 mV to VCC reference range permits scaling, although the selected VREF directly determines the input measurement span. At 200 kS/s, verify that each source has settled before conversion and confirm noise and linearity limits in the official datasheet.
おすすめ
Resistive Touch Panel Control
The ADS7844E is applicable to resistive touch-panel control because it can scan multiple single-ended inputs through a synchronous serial interface and supports a 200 kS/s conversion rate. Its eight input channels can represent panel coordinates, pressure, or auxiliary controls when configured with the appropriate resistor network. The 12-bit code width provides 4096 nominal levels, while the reference range of 100 mV to VCC supports different excitation schemes. Account for panel resistance, switch resistance, sampling time, and ground bounce when calculating the usable scan rate.
おすすめ
Programmable Instrumentation
The ADS7844E supports programmable instrumentation where several precision analog quantities must be converted into a digital stream. Its multiplexed SAR architecture reaches 200 kS/s and offers eight single-ended or four differential configurations, making it useful for controlled measurement front ends. The reference voltage may range from 100 mV to VCC, allowing the analog range to be matched to the sensor and amplifier chain. For laboratory or field instrumentation, use a low-noise reference and verify the reference-current requirements, source settling, and acquisition timing before operation.
おすすめ
Factory Automation Control
The ADS7844E can serve as the analog measurement engine in factory automation modules that monitor pressure, position, level, or analog sensor outputs. Eight single-ended inputs reduce the number of converters needed, and differential operation is available for four channels where common-mode interference is significant. Its 200 kS/s SAR throughput is more than adequate for many supervisory and control loops, while the typical 3 mW dissipation at 200 kHz and +5 V supports compact embedded electronics. Industrial qualification limits must be checked separately from the basic ADC functionality.
おすすめ
Battery-Powered Data Acquisition
The ADS7844E is useful in battery-powered data loggers because its shutdown mode can reduce consumption between measurement bursts, and the verified typical dissipation is only 3 mW at 200 kHz with a +5 V supply. Eight single-ended inputs allow multiple sensors to share one converter. A duty-cycled controller can enable or configure the converter only when samples are required, reducing energy use without changing the serial data format. Actual battery life depends on the complete supply architecture, reference behavior, wake-up timing, and leakage current, none of which are quantified in the supplied excerpts.
おすすめ
Portable Environmental Monitoring
The ADS7844E fits portable environmental-monitoring devices that combine several analog sensor inputs with a low-power digital controller. Four differential channels can support bridge or ratiometric sensors where common-mode noise rejection is important, while eight single-ended channels accommodate temperature, humidity, light, and status inputs. The 12-bit resolution and 200 kS/s peak conversion rate cover many slow environmental measurements. Because the device is multiplexed, the sensor output must settle within the acquisition interval, and sensor excitation strategy can affect power consumption and measurement accuracy.
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: ADS7844E — 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 | ADS7844N | MAX147 |
|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Maxim Integrated |
| Package | 20-lead SSOP | 20-lead SSOP | 20-lead SSOP |
主な差別化要因
- High channel count for a compact multiplexed converter （vs MAX147)
- Verified 200 kS/s conversion throughput （vs MAX147)
- Adjustable reference range （vs ADS7844N)
設計ノート
The verified typical dissipation is 3 mW at 200 kHz throughput with a +5 V supply. Use shutdown mode during long inactive periods, but confirm the shutdown current and required wake-up interval in the official datasheet. Place local bypass capacitors close to the supply and reference pins, and route the reference return separately from noisy digital return paths to avoid introducing reference error.
Because the ADS7844E multiplexes eight input channels, the selected source must settle within the available acquisition interval. Estimate the required acquisition time from the source impedance, the 100 mV-to-VCC reference range, and the required conversion accuracy, then compare that requirement with the 200 kS/s maximum throughput. Long sensor cables or high-impedance dividers may require lower conversion rates, longer acquisition times, or dedicated buffers.
Keep analog input and reference traces short, isolate them from high-current switching paths, and provide a low-impedance ground reference. The 20-lead SSOP footprint has relatively narrow lead spacing, so verify board design rules, solder-paste volume, assembly profile, and inspection access. Avoid routing serial clock and data returns directly beneath sensitive input nets where shared impedance could couple converter activity into the analog measurement.
コンプライアンス情報
The supplied verified excerpts do not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. The MAX147 cross-reference excerpt states a 40°C to +85°C operating range, but no qualification claim was provided for ADS7844E.
