ADS7815U - 16-Bit 250 kSPS SAR ADC | Texas Instruments
部品番号: ADS7815U ✓ 生産中ADS7815U 概要
What is a SAR ADC? A successive-approximation-register analog-to-digital converter samples an analog input and determines each successive bit through repeated internal comparison and capacitor-DAC conversion. Unlike a pipeline ADC, this architecture generally combines lower power, lower cost, and direct conversion with useful resolution for instrumentation and industrial control. Within the broader semiconductor hierarchy, the ADS7815U is an ADC, a data-converter IC, and a signal-chain device used for precision measurement and digital control.
The ADS7815U provides a throughput rate of 250 kSPS, 16-bit resolution, one single-ended analog channel, and an internal sample-and-hold, reference, and clock. Its stated dynamic performance includes 96 dB minimum SFDR and 84 dB minimum SINAD for a 100 kHz full-scale sine-wave input. These figures make the converter appropriate for systems requiring clean digitization of mid-frequency analog signals while retaining a straightforward parallel data path.
Technically, the device uses a capacitor-based 16-bit SAR conversion stage and an inherent sample-and-hold network. The parallel interface exposes converted data without requiring a serial protocol, which can simplify connections to older microcontrollers, DSPs, FPGA logic, or data-capture systems. Because this is a parallel-output device, system-level design must address the 16-bit data bus, control signals, reference bypassing, analog-input conditioning, and timing margins around each conversion.
Typical uses include industrial process measurement, laboratory instrumentation, sensor-interface modules, communications equipment, audio digitization, and embedded data-acquisition systems. Its 250 kSPS throughput is particularly relevant where the input bandwidth is limited but precision and deterministic conversion timing matter. The 96 dB SFDR figure indicates that harmonics can remain well below the fundamental for the specified 100 kHz test condition, while 84 dB SINAD describes combined noise-and-distortion performance.
A primary design consideration is analog signal integrity. The input should be bandwidth-limited and referenced to the converter's single-ended input range, while supply and reference decoupling should be placed close to their associated pins. The parallel output timing and any required output buffering must also be checked against the host processor. Because the verified snippets do not provide the complete pin names or absolute input limits, designers should confirm those details in the Texas Instruments ADS7815 datasheet before layout release.
This page consolidates the verified manufacturer and distributor facts for ADS7815U, compares same-package family alternatives, identifies missing pin-level and pricing information, and adds practical application and selection guidance that should be checked against the latest official datasheet.
ドロップイン代替品: ADS7815U — 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: ADS7815U （同一形状・フットプリント） — 相違点: Package, Architecture, Operating Temperature Range, Resolution, RoHS Status.
ADS7811U/1K
✅ 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 →ADS7812U/1KG4
✅ 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 →ADS7816UB/2K5G4
✅ 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 →ADS7813UB/1K
✅ 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 →ADS7817U/2K5G4
✅ 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 →ADS7815U 最大定格＆電気的特性
| 分解能 | 16 bit |
| サンプリングレート | 250 kSPS |
| Input Channel Count | 1 channel |
| Architecture | Successive-approximation-register (SAR) |
| Input Type | Single-ended |
| Data Interface | Parallel |
| Converter Technology | CMOS |
| パッケージ | 28-pin SOIC (DW) |
| 動作温度範囲 | -25°C to +85°C |
| Spurious-Free Dynamic Range | 96 dB minimum at 100 kHz input |
| Signal-to-Noise Plus Distortion | 84 dB minimum at 100 kHz input |
| Sample-and-Hold | Internal |
| Internal Reference | Yes |
| Internal Clock | Yes |
ADS7815U 28-pin soic (dw) ピン配置ガイド
ADS7815U (28-pin soic (dw) 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: ADS7815U.
詳細は データシート をご参照ください。
主な用途
ADS7815U の用途: 6 件s: Industrial Process Measurement, Laboratory Data-Acquisition Equipment, Sensor and Transducer Interfaces, Communications and Modulation Equipment, Audio and Dynamic Signal Capture, Embedded Control and Acquisition Modules.
Industrial Process Measurement
ADS7815U fits industrial process-measurement systems that digitize a conditioned single-ended sensor signal. Its verified 16-bit resolution and 250 kSPS throughput provide a useful combination when the measurement bandwidth is moderate but process-control timing must remain deterministic. The internal sample-and-hold, precision reference, and clock reduce the number of external active components required for a basic converter circuit. For pressure, temperature, or flow instrumentation, place the sensor amplifier close to the ADC and add an anti-alias filter before the input. The verified 96 dB minimum SFDR and 84 dB minimum SINAD at a 100 kHz input characterize dynamic performance, although the complete input range and conversion timing must be taken from the official datasheet.
Laboratory Data-Acquisition Equipment
ADS7815U is appropriate for laboratory instrumentation requiring precise acquisition of a single-ended analog waveform. The 250 kSPS throughput supports repeatable sampling in instruments whose useful bandwidth remains below the converter's acquisition capability, while 16-bit resolution limits quantization error in measurement systems. Its parallel output can feed an MCU, DSP, or FPGA without a serial data-conversion requirement. Use a low-noise input amplifier, a stable reference-decoupling network, and a properly terminated analog filter. Engineers should verify the exact parallel-interface timing, output logic levels, and acquisition cycle from the manufacturer datasheet before assigning FPGA pins or designing synchronous sampling logic.
Sensor and Transducer Interfaces
ADS7815U can serve as the conversion stage in a single-ended sensor interface when the design needs more resolution than a lower-bit embedded ADC. Its 250 kSPS sampling capability is suitable for temperature, pressure, strain, and position sensing systems that do not require simultaneous-channel acquisition. The internal sample-and-hold, reference, and clock help simplify the converter subsystem, but the sensor amplifier still determines input range, offset, noise, and common-mode rejection. Design the signal path so the ADC pin sees a controlled voltage within its official input range. Verify supply voltage, reference behavior, and acquisition settling time in the Texas Instruments datasheet, since those limits are not reproduced in the supplied web excerpts.
Communications and Modulation Equipment
ADS7815U is suitable for communications-adjacent measurement or demodulation paths requiring a single-ended 16-bit conversion stage. Its verified 250 kSPS throughput supports sampling of lower-bandwidth communications signals, while 96 dB minimum SFDR with a 100 kHz full-scale input indicates good suppression of harmonic distortion under the stated test condition. The parallel interface can provide direct data transfer into digital signal-processing logic. A bandpass filter should limit input bandwidth before the ADC, and the system designer should account for the converter's full-scale range, reference accuracy, and acquisition settling. These values must be confirmed in the official datasheet before setting filter gain or calculating link-budget margins.
Audio and Dynamic Signal Capture
ADS7815U can be applied to audio and dynamic-signal acquisition when a 16-bit converter and parallel data path are preferred. The 84 dB minimum SINAD and 96 dB minimum SFDR specifications provide useful evidence of signal quality for a 100 kHz full-scale input. In a practical design, an input filter should suppress ultrasonic content and energy outside the converter's useful bandwidth, while a low-noise preamplifier establishes the required signal level. Because the verified material does not state the analog input range, supply rails, or input impedance, engineers must confirm those parameters in the manufacturer datasheet. The result should then be checked for clipping, full-scale utilization, and interface timing.
Embedded Control and Acquisition Modules
ADS7815U is suitable for an embedded data-acquisition module that connects a single analog channel to an MCU, DSP, or FPGA. The parallel interface avoids adding a serial data protocol, while the internal clock, reference, and sample-and-hold provide a consolidated conversion subsystem. Its verified 16-bit resolution and 250 kSPS throughput can support feedback monitoring, machine-control signals, or diagnostic channels sampled at moderate rates. The host processor must be checked for a compatible 16-bit bus or segmented acquisition interface. Decoupling capacitors should be placed at the supply and reference pins according to the official recommended layout, and the PCB should preserve a short, quiet analog-input path to minimize conversion-dependent error.
エンジニアリング参考データ: ADS7815U — 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 | ADS7811U | ADS7812U | ADS7816U | ADS7813U | ADS7817U |
|---|---|---|---|---|---|---|
| Package | 28-pin SOIC (DW) | 28-pin SOIC (DW) | 28-pin SOIC (DW) | 28-pin SOIC (DW) | 28-pin SOIC (DW) | 28-pin SOIC (DW) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Conversion Architecture | SAR | SAR | SAR | SAR | SAR | SAR |
主な差別化要因
- Higher verified conversion throughput within the supplied family evidence （vs ADS7811U)
- Documented dynamic performance at a 100 kHz full-scale input （vs ADS7812U)
- Single-ended input reduces the required analog front-end complexity （vs ADS7813U)
- Complete integrated conversion subsystem （vs ADS7816U)
設計ノート
Treat the analog input as a high-impedance, time-sensitive node. Route it away from the 16-bit parallel outputs, keep the source impedance as low as practical, and place the input filtering or driver close to the ADC. The verified 250 kSPS rating does not by itself define usable input bandwidth; the complete acquisition time, input-impedance requirement, and source-settling limits must be taken from the manufacturer datasheet before selecting series resistance or capacitor values.
Follow the official ADS7815 recommended layout for supply and reference decoupling. Place each specified capacitor at the corresponding pin with a short ground return, and avoid routing digital output transitions beneath the analog input, reference, or internal clock area. The parallel interface can create fast edge currents, so a quiet analog region and a solid ground reference are important. Exact capacitance values and layout geometry are [DATA_NEEDED] because they were not present in the verified excerpts.
Do not assume that another ADS781x MPN is a drop-in replacement merely because it uses a 28-pin SOIC package. Verify pin names, data-bus direction, conversion timing, output coding, input range, reference behavior, and control-signal polarity against each official datasheet. ADS7811U is described as a complete replacement in the supplied cross-reference excerpt, but the remaining family alternatives are LLM-sourced candidates and require manufacturer-documentation confirmation before substitution.
Confirm the supported supply arrangement and sequencing requirements from the Texas Instruments ADS7815 manufacturer datasheet, Revision B. The verified snippets identify the part as CMOS but do not provide supply-voltage limits or quiescent-current values. In a multi-rail instrument, verify that analog and digital rails satisfy their respective limits and that the host processor does not drive the 16-bit bus in an incompatible state during power-up or reset.
コンプライアンス情報
The supplied verified excerpts do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. ADS7815U is an industrial-temperature device, but that does not establish AEC-Q100 qualification.