ADS8381IBPFBR - 18-Bit 580kHz SAR ADC | 48-TQFP | Texas Instruments
部品番号: ADS8381IBPFBR ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $14.5 | $14.50 |
| 10 | $13.05 | $130.50 |
| 100 | $11.6 | $1,160.00 |
| 500 | $10.45 | $5,225.00 |
| 1,000 | $9.85 | $9,850.00 |
ADS8381IBPFBR 概要
A successive-approximation register (SAR) ADC is a type of data converter that performs a binary search through an internal capacitive DAC, producing a digital output in a fixed number of clock cycles with no pipeline delay. SAR ADCs belong to the broader category of Nyquist-rate analog-to-digital converters, which sit at the bottom of the data-converter hierarchy: ADC -> data converter -> signal chain IC -> mixed-signal semiconductor. They are valued for their single-shot accuracy, deterministic latency, and excellent DC linearity compared to delta-sigma or pipeline alternatives.
Key features include 580 kHz sample rate, 18-bit NMC ensured over temperature, unipolar analog input, zero latency, internal reference buffer, internal conversion clock, and a wide 2.7V to 5.25V analog supply range. The parallel digital interface provides easy connection to microcontrollers, DSPs, and FPGAs without requiring a high-speed serial clock. Industrial temperature grade (-40C to +85C) and a small 7x7 mm TQFP footprint enable compact designs in dense signal-conditioning boards.
Typical applications include medical instruments such as patient monitors and portable diagnostic equipment, optical networking line-side data acquisition, transducer interfaces for bridge and thermocouple front-ends, high-accuracy data acquisition systems, and magnetometer signal chains. The 580 kHz throughput comfortably digitizes multi-kHz bandwidth signals at 18-bit precision, while the 115 mW dissipation allows fan-less operation in sealed enclosures.
When designing with this device, drive the analog input with a low-impedance, wide-bandwidth op-amp buffer such as the OPA227 or THS4631 to preserve linearity at the ADC's full-scale settling time. Provide a clean low-noise analog supply and decouple both AVDD and DVDD with 10uF bulk plus 0.1uF ceramic capacitors placed within 5 mm of the supply pins.
ドロップイン代替品: ADS8381IBPFBR — 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: ADS8381IBPFBR （同一形状・フットプリント） — 相違点: Package, Input Type, Sample Rate, Architecture, Resolution.
クイック比較ツール — 並列比較する代替部品を選択:
ADS8381IBPFBT
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADS8383IPFBR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADS8383IPFBT
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADS8342IBPFBR
✅ ドロップイン✓ 在庫あり
$9.45 / 個
データシートを見る →ADS8482IBRGZR
✅ ドロップイン✓ 在庫あり
$14.45 / 個
データシートを見る →ADS8381IBPFBR 最大定格＆電気的特性
| 分解能 | 18 bit |
| Sample Rate | 580 kSPS |
| Architecture | SAR (Successive Approximation) |
| Number of Channels | 1 |
| Input Type | Single-Ended Unipolar |
| Data Interface | Parallel |
| パッケージ | 48-TQFP (PFB) 7x7 mm |
| ピン数 | 48 |
| 動作温度範囲 | -40C to +85C |
| Analog Supply Voltage | 2.7 V to 5.25 V |
| Power Dissipation | 115 mW at 580 kHz |
| No Missing Code | 18-bit NMC ensured over temperature |
| Latency | Zero (SAR architecture) |
| 実装タイプ | Surface Mount |
| RoHS ステータス | Compliant |
| Terminal Form | Gull Wing |
| Package Code | TFQFP |
ADS8381IBPFBR ピン構成
| ピン 1 | DVDD — Digital supply |
| ピン 2 | DGND — Digital ground |
| ピン 3 | DB0 — Data output bit 0 (LSB) |
| ピン 4 | DB1 — Data output bit 1 |
| ピン 5 | DB2 — Data output bit 2 |
| ピン 6 | DB3 — Data output bit 3 |
| ピン 7 | DB4 — Data output bit 4 |
| ピン 8 | DB5 — Data output bit 5 |
| ピン 9 | DB6 — Data output bit 6 |
| ピン 10 | DB7 — Data output bit 7 |
| ピン 11 | DB8 — Data output bit 8 |
| ピン 12 | DB9 — Data output bit 9 |
| ピン 13 | DB10 — Data output bit 10 |
| ピン 14 | DB11 — Data output bit 11 |
| ピン 15 | DB12 — Data output bit 12 |
| ピン 16 | DB13 — Data output bit 13 |
| ピン 17 | DB14 — Data output bit 14 |
| ピン 18 | DB15 — Data output bit 15 |
| ピン 19 | DB16 — Data output bit 16 |
| ピン 20 | DB17 — Data output bit 17 (MSB) |
| ピン 21 | DGND — Digital ground |
| ピン 22 | DVDD — Digital supply |
| ピン 23 | BUSY — Conversion in progress (active high) |
| ピン 24 | CS — Chip select (active low) |
| ピン 25 | RD — Read strobe (active low) |
| ピン 26 | CONVST — Conversion start (active low) |
| ピン 27 | RESET — Reset (active low) |
| ピン 28 | NC — Not connected |
| ピン 29 | REFM — Reference ground |
| ピン 30 | REFIN — Reference input |
| ピン 31 | REFOUT — Reference output (internal buffer) |
| ピン 32 | AGND — Analog ground |
| ピン 33 | AVDD — Analog supply |
| ピン 34 | AGND — Analog ground |
| ピン 35 | IN+ — Analog positive input |
| ピン 36 | IN- — Analog negative input (tied to AGND for unipolar) |
| ピン 37 | AGND — Analog ground |
| ピン 38 | AVDD — Analog supply |
| ピン 39 | NC — Not connected |
| ピン 40 | NC — Not connected |
| ピン 41 | NC — Not connected |
| ピン 42 | NC — Not connected |
| ピン 43 | AGND — Analog ground |
| ピン 44 | AVDD — Analog supply |
| ピン 45 | NC — Not connected |
| ピン 46 | NC — Not connected |
| ピン 47 | DGND — Digital ground |
| ピン 48 | DVDD — Digital supply |
主な用途
ADS8381IBPFBR の用途: 8 件s: Medical Instrument Data Acquisition, Optical Networking Line-Side Digitization, Precision Transducer Interface, High-Accuracy Data Acquisition Systems, Magnetometer and Compass Signal Chains, Industrial Process Control and Automation, Portable Test and Measurement, Audio Bandwidth Precision Digitization.
Medical Instrument Data Acquisition
The ADS8381IBPFBR's 18-bit NMC and 580 kSPS throughput suit medical front-ends digitizing biopotential and transducer signals where DC accuracy dominates. Its 115 mW dissipation allows fan-less patient monitors and portable diagnostic carts, while the 48-TQFP 7x7 mm footprint fits compact bedside enclosures. The zero-latency SAR architecture ensures deterministic single-shot conversions for safety-critical measurements such as ECG, SpO2 photodiode currents, and infusion-pump pressure transducers. Drive the input with a low-noise op-amp such as the INA128 instrumentation front-end and decouple AVDD/DVDD with 10uF + 0.1uF ceramics to preserve linearity across the 18-bit dynamic range.
おすすめ
Optical Networking Line-Side Digitization
Optical transponder and line-card designs use the ADS8381IBPFBR to digitize received analog signals from PIN or APD photodiode TIAs before DSP-based clock-data recovery. The 580 kSPS throughput handles multi-MHz bandwidth signals at 18-bit precision, while the parallel interface streams directly into an FPGA or ASIC without serial-clock overhead. Its unipolar input matches single-supply transimpedance-amplifier outputs, and the 48-TQFP industrial-grade package withstands line-card ambient temperatures. Combine with a THS4631 wide-band op-amp buffer and clean AVDD supply to achieve the linearity demanded by long-haul optical links.
おすすめ
Precision Transducer Interface
Strain-gauge bridges, load cells, RTD signal conditioners, and thermocouple amplifiers all benefit from the ADS8381IBPFBR's 18-bit NMC and zero SAR latency. Single-shot digitizations eliminate pipeline ambiguity for weighing scales and force-feedback systems requiring deterministic readings. The 2.7V to 5.25V analog supply simplifies integration with 3.3V or 5V transducer excitation rails. Industrial-grade -40C to +85C operation supports outdoor and factory-floor deployments. Pair with the ADS131A04 ADC for multi-channel bridge applications, or use the OPA227 low-offset op-amp as a precision front-end buffer.
おすすめ
High-Accuracy Data Acquisition Systems
PCI- and PXI-style modular DAQ boards use the ADS8381IBPFBR as a per-channel simultaneous-sampling ADC where 18-bit NMC and 580 kSPS throughput combine for laboratory-grade measurement. The parallel bus simplifies interface to FPGA-based timing engines and on-board DSP. Zero latency simplifies trigger-and-arm sequencing in transient recorders. Its low 115 mW dissipation supports dense multi-board chassis without active cooling, and the 48-TQFP industrial package is compatible with automated pick-and-place assembly.
おすすめ
Magnetometer and Compass Signal Chains
Fluxgate and AMR magnetometer front-ends produce sub-kHz analog signals requiring high DC resolution; the ADS8381IBPFBR's 18-bit NMC captures field changes below 1 nT when paired with low-noise instrumentation amplifiers. Its 580 kSPS sample rate oversamples slowly varying magnetic fields, supporting averaging for sub-LSB noise reduction. Industrial temperature grade ensures stable compass headings across outdoor and avionics environments. The unipolar input accepts single-ended magnetometer amplifier outputs, simplifying signal conditioning.
おすすめ
Industrial Process Control and Automation
PLC analog input modules and process-control digitizers use the ADS8381IBPFBR to convert 4-20 mA or 0-10V process signals into 18-bit digital readings at up to 580 kSPS. The zero-latency SAR conversion supports fast safety-loop response times, and the wide 2.7V to 5.25V supply tolerates 24V industrial bus rails after front-end scaling. The 48-TQFP package's industrial temperature rating handles factory-floor ambient conditions. Pair with the ISO124 isolation amplifier for grounded-noise immunity and the XTR116 4-20 mA current-loop transmitter for complete analog I/O subsystems.
おすすめ
Portable Test and Measurement
Handheld oscilloscope front-ends, bench multimeters, and field instrumentation use the ADS8381IBPFBR for high-DC-accuracy voltage and current digitizations at moderate bandwidths. Its 115 mW dissipation extends battery life in portable instruments, and the 48-TQFP compact footprint fits slim meter enclosures. The parallel interface supports burst-mode acquisitions to on-board microcontrollers or DSPs. Pair with the OPA2188 zero-drift op-amp for sub-1 uV offset front-ends in 6.5-digit multimeter designs, and use the TPS7A30 LDO for clean analog supply regulation.
おすすめ
Audio Bandwidth Precision Digitization
Professional audio analyzers and acoustic measurement systems use the ADS8381IBPFBR to capture 18-bit audio-bandwidth signals with deterministic SAR latency. The 580 kSPS throughput supports 96 kHz / 192 kHz oversampling ratios for digital-filter based noise shaping. While not a dedicated audio ADC, its 18-bit NMC and low distortion suit measurement-microphone and line-level analyzer digitizers where calibration accuracy matters more than dynamic range. Combine with the PCM4220 audio ADC for parallel precision-audio channels in test rigs.
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: ADS8381IBPFBR — 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 | ADS8381IBPFBT | ADS8383IPFBR | ADS8383IPFBT | ADS8342IBPFBR | ADS8482IBRGZR |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 48-TQFP (PFB) 7x7 mm | 48-TQFP (PFB) 7x7 mm - same | 48-TQFP (PFB) 7x7 mm - same | 48-TQFP (PFB) 7x7 mm - same | 48-TQFP (PFB) 7x7 mm - same | 48-pin QFN (RGZ) - same footprint family |
| Resolution | 18 bit | 18 bit | 16 bit | 16 bit | 16 bit | 18 bit |
| Sample Rate | 580 kSPS | 580 kSPS | 500 kSPS | 500 kSPS | 250 kSPS | 1000 kSPS |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR (pseudo-bipolar) |
| Input Channels | 1 unipolar | 1 unipolar | 1 unipolar | 1 unipolar | 8 (with MUX) | 1 pseudo-bipolar |
| Data Interface | Parallel | Parallel | Parallel | Parallel | Parallel/SPI | Parallel |
| Power Dissipation | 115 mW at 580 kSPS | 115 mW at 580 kSPS | 110 mW at 500 kSPS | 110 mW at 500 kSPS | 40 mW at 250 kSPS | 220 mW at 1 MSPS |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
主な差別化要因
- 18-bit NMC guaranteed over industrial temperature range （vs ADS8383IPFBR)
- Zero pipeline latency SAR architecture （vs ADS8482IBRGZR)
- True pin-compatible drop-in family member （vs ADS8422IBPFBR)
設計ノート
Decouple AVDD and DVDD separately with 10uF bulk plus 0.1uF ceramic capacitors placed within 5 mm of the supply pins. Keep the analog and digital ground returns joined at a single point near the ADC's AGND/DGND pins to avoid ground-loop noise coupling into the analog input. Use a low-noise LDO such as the TPS7A4701 for the AVDD rail; its 4.17 uVrms noise and 72 dB PSRR preserve the 18-bit NMC performance specified in the TI datasheet.
Drive the IN+ input with a low-impedance, wide-bandwidth op-amp buffer (such as the THS4631 or OPA227) capable of settling to 18-bit accuracy within the ADC's acquisition time. The buffer's output impedance must be below 50 ohm at the ADC's input bandwidth to avoid gain error. Place the buffer within 10 mm of the ADC input pin, with a ground plane underneath to minimize stray capacitance that would otherwise limit slew rate.
Estimated: routing digital data bus traces over the analog input region will couple switching noise into the IN+ pin and degrade SNR. Keep the DB[17:0] parallel bus traces on the opposite PCB layer from the IN+/IN- traces, separated by a continuous ground plane. Series-damp each digital output with a 33 ohm resistor near the ADC to damp transmission-line reflections on the parallel bus, which can otherwise cause data-correlated glitches during the BUSY=high conversion window.
Per TI's ADS8381 datasheet reference layout, place the REFIN decoupling capacitor (typically 10uF ceramic) directly between the REFIN and REFM pins with the shortest possible trace length. The internal reference buffer provides low-impedance reference voltage to the capacitive DAC; poor REFIN decoupling directly translates to gain error and DNL degradation. Route REFM as a dedicated analog ground trace back to the ADC's AGND pin, avoiding shared returns with digital switching currents.
コンプライアンス情報
RoHS compliant per TI product page. Industrial temperature grade (-40C to +85C) - not AEC-Q100 qualified. Halogen-free status not explicitly stated in verified data; set to 'unknown' rather than assumed.
