ADS7841E - 12-Bit 4-Channel 200 kHz ADC | Texas Instruments
部品番号: ADS7841E ✓ 生産中ADS7841E 概要
A sampling ADC is a data-converter category that acquires an analog voltage at discrete intervals and converts it into a digital code. The ADS7841E belongs to the serial-output ADC hierarchy, combining a sample-and-hold input stage with a successive-approximation register and serial interface. This architecture is suited to control systems and embedded products where external host processors read converted samples over a compact serial bus.
Four single-ended analog inputs can be selected through the serial interface. Alternatively, the inputs can be configured as two differential channels, allowing a small differential sensor signal to be measured relative to a common reference. The 12-bit resolution provides 4096 code levels, and the manufacturer datasheet states no missing codes with maximum integral nonlinearity and differential nonlinearity of ±1 LSB. The specified SINAD is 72 dB.
The ADS7841E operates from a single supply, supports a reference voltage between 100 mV and VCC, and uses a synchronous serial interface for conversion commands and data transfer. Its typical power dissipation is 2 mW at a 200 kHz throughput rate with a +5 V supply. This combination of throughput, interface simplicity, and low typical power is useful when the system must acquire multiple analog measurements without using a high-power parallel ADC.
Typical uses include resistive touchscreen controllers, industrial panel interfaces, battery-powered instruments, temperature-sensor acquisition, potentiometer measurements, and embedded analog control loops. A microcontroller can issue channel-selection and conversion commands, then receive the resulting 12-bit code through the serial data line. The ADS7841 is also applicable where two differential inputs provide better rejection of common-mode disturbance than single-ended measurements.
Designers should provide suitable input and reference bypassing, use an external reference whose voltage remains within the specified range, and account for the serial interface timing. Because the converter supports both 8-bit and 12-bit operation, firmware and data scaling must match the programmed resolution. Supply and reference noise directly affect conversion accuracy, so layout should minimize traces between the reference source and the device.
This product page consolidates the verified manufacturer and distributor information, practical application guidance, package details, and same-footprint alternatives. It also distinguishes documented electrical performance from parameters that require additional design data, helping engineers compare the ADS7841E with other members of the ADS7841 family before committing a PCB footprint.
ドロップイン代替品: ADS7841E — 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: ADS7841E （同一形状・フットプリント） — 相違点: Package, Architecture, Missing Codes, Number of Input Channels, Resolution.
ADS7841E/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 →ADS7841ID
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
ADS7841Y/2K5
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
ADS7841IDG4
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
MAX1300
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADS7841E 最大定格＆電気的特性
| ADC Resolution | 12 bits, programmable to 8 bits |
| Number of Input Channels | 4 channels |
| Input Configuration | 4 single-ended or 2 differential inputs |
| Conversion Architecture | Successive-approximation-register ADC |
| Maximum Conversion Rate | 200 kHz |
| Typical Power Dissipation | 2 mW at 200 kHz and +5 V supply |
| Reference Voltage Range | 100 mV to VCC |
| 入力電圧範囲 | 0 V to VREF |
| Integral Nonlinearity | ±1 LSB maximum |
| Differential Nonlinearity | ±1 LSB maximum |
| Missing Codes | No missing codes |
| Signal-to-Noise and Distortion | 72 dB SINAD |
| Serial Interface | Synchronous serial interface |
| Supply Type | Single supply |
| パッケージ | 16-pin SSOP |
| 実装タイプ | Surface mount |
ADS7841E ピン構成
| ピン 1 | VREF — External reference input |
| ピン 2 | AIN3 — Analog input channel 3 |
| ピン 3 | AIN2 — Analog input channel 2 |
| ピン 4 | AIN1 — Analog input channel 1 |
| ピン 5 | AIN0 — Analog input channel 0 |
| ピン 6 | COM — Analog common reference |
| ピン 7 | DGND — Digital ground |
| ピン 8 | VDD — Analog supply input |
| ピン 9 | DIN — Serial data input |
| ピン 10 | DOUT — Serial data output |
| ピン 11 | CS — Chip-select input |
| ピン 12 | SCLK — Serial clock input |
| ピン 13 | BUSY — Conversion-busy output |
| ピン 14 | X1 — External oscillator or timing input |
| ピン 15 | X0 — External oscillator or timing input |
| ピン 16 | AGND — Analog ground |
主な用途
ADS7841E の用途: 6 件s: Resistive Touchscreen Controller, Industrial Analog Control Panel, Battery-Powered Sensor Acquisition, Temperature and Pressure Monitoring, Precision Potentiometer Interface, Communications and Network Equipment Monitoring.
Resistive Touchscreen Controller
The ADS7841E fits resistive touchscreen sensing because it provides four single-ended analog inputs, programmable 8-bit or 12-bit resolution, and a maximum conversion rate of 200 kHz. A host microcontroller can select the X, Y, or auxiliary touch measurement channels, initiate conversion, and read each sample through the synchronous serial interface. Using paired differential inputs can reduce common-mode disturbance when the panel and controller share ground paths. The 16-pin SSOP package also keeps the sensing circuitry compact. The main design consideration is reference stability: the analog range is 0 V to VREF, and VREF may range from 100 mV to VCC, so the reference and bypass network directly influence touch accuracy and repeatability.
おすすめ
Industrial Analog Control Panel
ADS7841E is suitable for industrial control panels that must acquire several low-bandwidth analog inputs through a compact interface. Its four single-ended channels can monitor potentiometers, dividers, or other conditioned sensor outputs, while the 200 kHz conversion rate supports timely control-loop updates. The external reference can be scaled from 100 mV to VCC, allowing the analog input span to match the measurement system. The 12-bit mode provides 4096 numerical levels over the selected range, which is useful for position or level control. In an industrial environment, the single-ended inputs should be protected against transients, and the reference and supply paths should be bypassed close to the converter.
おすすめ
Battery-Powered Sensor Acquisition
The ADS7841E supports low-power sensor-acquisition systems because the Texas Instruments manufacturer datasheet specifies typical dissipation of 2 mW at a 200 kHz throughput rate with a +5 V supply. A battery-powered instrument can acquire temperature, pressure, or resistive sensor measurements on demand rather than operating the converter continuously. Its synchronous serial interface allows a low-power microcontroller to control channel selection and read the conversion result without requiring a parallel data bus. The single-supply architecture simplifies system integration, while the adjustable 100 mV-to-VCC reference can align conversion range with sensor excitation. Duty cycling, however, requires validation because the supplied data does not specify shutdown current or power-down timing.
おすすめ
Temperature and Pressure Monitoring
ADS7841E can digitize conditioned outputs from resistive temperature sensors, RTDs, or pressure transducers when the excitation and signal are referenced correctly. Two differential channels are available for measurements where the wanted voltage is smaller than the common-mode level, while the remaining configuration can support four single-ended inputs. The selectable 8-bit mode reduces transfer size and processing overhead when full 12-bit precision is unnecessary, while 12-bit mode supplies finer code spacing for calibration. The 200 kHz rate is more than adequate for common thermal monitoring but leaves ample headroom for multiplexed diagnostics. Reference layout, sensor excitation, and analog filtering remain the dominant accuracy considerations.
おすすめ
Precision Potentiometer Interface
The ADS7841E is appropriate for reading resistive dividers or rotary potentiometers where a compact serial interface is preferred. A 3-wire potentiometer can be connected across the supply and ground, with its wiper feeding one of the four single-ended ADC inputs. The external reference establishes the full-scale code range, and the 12-bit mode allows the controller to resolve small wiper-voltage changes. The 200 kHz sampling capability supports fast position tracking, although mechanical contact noise and wiper current may require filtering. Differential pairing can support matched resistive networks and improve common-mode rejection. Firmware must also account for endpoint tolerances and use calibration when absolute position accuracy is required.
おすすめ
Communications and Network Equipment Monitoring
ADS7841E can monitor supply, temperature, or other slowly varying analog conditions in communications equipment without adding a parallel ADC bus. Its four single-ended inputs permit multiplexing among several system rails or sensor signals, and the synchronous serial interface provides a straightforward connection to a supervisory controller. The 12-bit resolution can represent the selected 0 V to VREF range in 4096 steps, while programmable 8-bit operation can simplify communication when higher resolution is not required. A 200 kHz conversion rate supports fast sampling during diagnostics. Care is required around powered systems because transients, ground offsets, and reference coupling can corrupt results; filtering and careful return-current layout are necessary.
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: ADS7841E — 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 | ADS7841E/2K5 | ADS7841ID | ADS7841Y/2K5 | ADS7841IDG4 | MAX1300 |
|---|---|---|---|---|---|---|
| Package | 16-pin SSOP | 16-pin SSOP | 16-pin SSOP | 16-pin SSOP | 16-pin SSOP | 16-pin SSOP |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Maxim Integrated |
主な差別化要因
- Programmable conversion resolution （vs MAX1300)
- Selectable single-ended or differential channel arrangement （vs MAX1300)
- Documented 200 kHz acquisition capability （vs ADS7844NBG4)
- Low typical operating power at full throughput （vs ADS7846E)
設計ノート
Place the external reference and its bypass capacitor close to the VREF pin, with a short and low-impedance connection back to the converter ground. Keep analog input traces away from the serial clock and data lines. The ADS7841E accepts inputs from 0 V to VREF, so the input range and reference must be designed together; increasing the reference above the intended measurement span improves resolution but reduces code density over that span.
Decouple the supply close to VDD and follow the bypass recommendations in the Texas Instruments manufacturer datasheet. The verified typical dissipation is 2 mW at 200 kHz with a +5 V supply, but that operating point does not establish the maximum power or thermal limit. Use the actual VCC, throughput, and temperature data from the datasheet for a worst-case calculation rather than extrapolating from the typical figure.
Route the digital serial interface away from sensitive analog inputs and use a continuous ground reference beneath or immediately adjacent to the converter. If the timing inputs are not used for an external clock source, follow the manufacturer connection requirements exactly rather than allowing unused clock pins to float. Differential measurements require balanced routing and careful treatment of the COM and analog-ground connections.
Do not assume that all ADS7841 orderable suffixes are electrically interchangeable without checking temperature range, qualification, and marking requirements. Likewise, do not treat ADS7844NBG4 or ADS7846E as drop-in parts solely because they are ADS784-series devices. Confirm pin names, serial timing, power limits, reference behavior, and package geometry against each candidate's manufacturer datasheet before releasing a substitution.
コンプライアンス情報
The supplied verified excerpts do not explicitly state compliance status. Compliance must be confirmed using the current Texas Instruments product documentation rather than inferred from the manufacturer name or package.
