ADS8318IDRCR - 16-Bit 500kSPS SAR ADC | Texas Instruments | SON-10
部品番号: ADS8318IDRCR ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $11.5 | $11.50 |
| 10 | $10.35 | $103.50 |
| 100 | $8.95 | $895.00 |
| 500 | $7.75 | $3,875.00 |
| 1,000 | $6.85 | $6,850.00 |
ADS8318IDRCR 概要
A SAR (Successive Approximation Register) ADC is a type of analog-to-digital converter that uses a binary search algorithm against an internal precision DAC to digitize an input voltage in N clock cycles, where N is the resolution in bits. SAR ADCs offer deterministic latency, no pipeline delay, and excellent DC accuracy, which is why they are widely used in precision industrial sensing, weigh scales, instrumentation, and process control. Within the broader taxonomy, the SAR ADC belongs to the data converter family, which sits inside signal chain ICs and ultimately under power management and analog signal chain semiconductors.
Key features include an unipolar differential input that simplifies front-end signal conditioning, ultra-low power dissipation of approximately 18 mW at 500 kSPS, and a power-down mode that reduces current to a few microamps between conversions. The device uses an external reference voltage, allowing the user to trade off input range versus noise. Its SPI-compatible serial interface reduces board-routing complexity compared to parallel ADCs, while the small 3x3 mm VSON package enables high-density layouts.
In terms of architecture, the ADS8318 integrates a sample-and-hold, a precision DAC, a comparator, and an SAR register. The conversion process is initiated by CONVST and completed via an external serial clock. The DRC package includes an exposed thermal pad to lower junction-to-board thermal resistance, which helps the part sustain 500 kSPS throughput without thermal throttling in compact layouts.
Typical uses span handheld test equipment, multi-channel data-acquisition systems, optical module monitoring, battery management systems, and industrial process control. The differential input is especially valuable where ground-loop noise or single-ended signal swings must be rejected.
When designing with this part, pay close attention to the reference bypass network (a 10 uF tantalum in parallel with 0.1 uF ceramic is typical), keep analog and digital grounds separated until they meet at a single point, and avoid driving the analog input directly from a high-impedance source without an input buffer. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that go beyond what the manufacturer datasheet alone provides.
ドロップイン代替品: ADS8318IDRCR — 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: ADS8318IDRCR （同一形状・フットプリント） — 相違点: Resolution, Data Interface, Package, Architecture, Sampling Rate.
クイック比較ツール — 並列比較する代替部品を選択:
ADS8318IDRCT
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADS8319IDRCR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADS8320IDRCR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADS8324IDRCR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADS8317IDRCR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADS8318IDRCR 最大定格＆電気的特性
| 分解能 | 16 bit |
| Sample Rate | 500 kSPS |
| Input Type | Unipolar Differential |
| Number of Input Channels | 1 |
| Architecture | SAR |
| Supply Voltage Range | 4.5 V to 5.5 V |
| Conversion Time | 1.4 us |
| インターフェース | Serial (SPI/QSPI/MICROWIRE-compatible) |
| Integral Non-Linearity (INL) | ±0.0023% FSR |
| Power Dissipation | 18 mW at 500 kSPS |
| 動作温度範囲 | -40 C to +85 C |
| パッケージ | 10-VSON (DRC) 3x3 mm |
| 実装タイプ | Surface Mount |
| Reference Type | External |
| RoHS ステータス | Compliant |
ADS8318IDRCR ピン構成
| ピン 1 | REF — External reference input |
| ピン 2 | IN+ — Positive analog input |
| ピン 3 | IN- — Negative analog input (differential) |
| ピン 4 | GND — Analog ground |
| ピン 5 | VDD — Analog supply (4.5V to 5.5V) |
| ピン 6 | DOUT — Serial data output |
| ピン 7 | DCLOCK — Serial data clock input |
| ピン 8 | CS/SYNC — Chip select / synchronization |
| ピン 9 | CONVST — Conversion start input |
| ピン 10 | PD — Power-down control |
| ピン 11 | EP — Exposed thermal pad (connect to GND plane) |
主な用途
ADS8318IDRCR の用途: 7 件s: Industrial Process Control / 4-20 mA Loop Sensing, Portable Test & Measurement Instrumentation, Optical Module Monitoring (Transceivers, LiDAR Receivers), Battery Management Systems (BMS) Cell Monitoring, Medical Patient Monitoring (Diagnostic Equipment), Automotive Sensor Digitization (Non-Safety Domains), Weigh Scales and Precision Force Measurement.
Industrial Process Control / 4-20 mA Loop Sensing
The ADS8318IDRCR fits 4-20 mA loop transmitters and other industrial process sensors because of its 16-bit, 500 kSPS precision and unipolar differential input. With ±0.0023% FSR INL and a -40 C to +85 C operating range, it digitizes RTD, thermocouple, strain-gauge, and pressure-sensor outputs with high DC accuracy. The serial interface saves board space in multi-channel sensor boards, and 18 mW at full speed keeps thermal dissipation manageable in DIN-rail and field-mount enclosures. Differential sensing also rejects ground-loop noise commonly encountered across long sensor leads.
おすすめ
Portable Test & Measurement Instrumentation
The ADS8318IDRCR is ideal for handheld oscilloscope probes, multimeter front-ends, and bench-instrument signal digitizers where 16-bit, 500 kSPS sampling is needed in a compact footprint. The 10-VSON (DRC) 3x3 mm package enables dense PCB layouts inside handheld enclosures, and the deep power-down mode lets the host duty-cycle acquisitions to extend battery life. Differential input rejects the common-mode pickup that handheld probes routinely encounter. The external reference input means designers can trade full-scale range against noise for different measurement scenarios.
おすすめ
Optical Module Monitoring (Transceivers, LiDAR Receivers)
The ADS8318IDRCR supports optical-module bias and monitor-PD conditioning thanks to its 16-bit dynamic range and 500 kSPS update rate. The differential input simplifies direct interface to TIAs and monitor photodiodes that produce ground-referenced or differential currents. The small 3x3 mm footprint is critical in QSFP/QSFP-DD, SFP, and PAM4 optical modules where board space is at a premium. Its 4.5V-5.5V supply aligns with the optical module 5V rails, eliminating extra regulator stages.
おすすめ
Battery Management Systems (BMS) Cell Monitoring
The ADS8318IDRCR suits battery-cell voltage and current monitoring in lithium-ion and lead-acid battery packs because its 16-bit resolution and 500 kSPS throughput can capture transient events. The differential input rejects large common-mode swings inherent to stacked-cell monitors, while the serial interface simplifies isolation with digital isolators. The 5V single-supply rail is convenient for cell-monitor ICs that share the same bus. Deep power-down between samples reduces average current draw, extending standby life in EV and UPS systems.
おすすめ
Medical Patient Monitoring (Diagnostic Equipment)
The ADS8318IDRCR's 16-bit no-missing-code performance and low noise make it a solid choice for diagnostic patient monitoring front-ends, including ECG, EEG, and pulse-oximetry analog front-ends. The differential input rejects mains-frequency interference common in clinical environments, while the 500 kSPS throughput handles multi-channel multiplexing of physiological signals. The compact 10-VSON package simplifies dense board layouts in bedside monitors and portable patient devices. Designers must still follow IEC 60601 isolation and leakage requirements at the system level.
おすすめ
Automotive Sensor Digitization (Non-Safety Domains)
Although not AEC-Q100 qualified, the ADS8318IDRCR is suitable for non-safety automotive sensor digitization such as HVAC, body-control, and infotainment analog front-ends. The 16-bit resolution supports accurate temperature, humidity, and pressure sensing for cabin climate and chassis modules. The 4.5V to 5.5V supply tolerates automotive 12V-derived rails after pre-regulation, and the 500 kSPS throughput handles vibration and position-sensor digitizing. For ADAS or safety-critical paths, an AEC-Q100 ADC like the ADS7953-Q1 should be selected instead.
おすすめ
Weigh Scales and Precision Force Measurement
The ADS8318IDRCR's 16-bit resolution and low INL make it a strong candidate for load-cell readouts in industrial weigh scales and force-gauging systems. The differential input directly interfaces the bridge output of strain-gauge load cells without extra instrumentation amplifiers in many designs. The 500 kSPS throughput supports fast settling for in-motion weighing, and the small 3x3 mm VSON package allows compact designs within bench-top and in-line scales. Stable references and matched bypass capacitors are still required to realize the full 16-bit noise-free performance.
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: ADS8318IDRCR — 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 | ADS8318IDRCT | ADS8319IDRCR | ADS8320IDRCR | ADS8324IDRCR | ADS8317IDRCR |
|---|---|---|---|---|---|---|
| Package | 10-VSON (DRC) 3x3 mm | 10-VSON (DRC) 3x3 mm - same | 10-VSON (DRC) 3x3 mm - same | 10-VSON (DRC) 3x3 mm - same | 10-VSON (DRC) 3x3 mm - same | 10-VSON (DRC) 3x3 mm - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 14 bit | 14 bit |
| Sample Rate | 500 kSPS | 500 kSPS | 500 kSPS | 100 kSPS | 50 kSPS | 500 kSPS |
| Input Type | Unipolar Differential | Unipolar Differential | Pseudo-Differential | True Differential | Unipolar Differential | Single-Ended |
| Supply Voltage | 4.5V to 5.5V | 4.5V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V |
| Power Dissipation at Full Speed | 18 mW | 18 mW | ~5 mW | ~3.5 mW | ~2 mW | ~10 mW |
| Interface | Serial (SPI/QSPI/MICROWIRE) | Serial (SPI/QSPI/MICROWIRE) | Serial (SPI/QSPI/MICROWIRE) | Serial (SPI/QSPI/MICROWIRE) | Serial (SPI/QSPI/MICROWIRE) | Serial (SPI/QSPI/MICROWIRE) |
主な差別化要因
- Highest sample rate in the 10-VSON (DRC) TI SAR family at 16-bit （vs ADS8320IDRCR (16-bit, 100 kSPS) and ADS8324IDRCR (14-bit, 50 kSPS))
- Unipolar differential topology with 16-bit precision in compact DRC package （vs ADS8319IDRCR (pseudo-differential, lower power))
- External reference enables flexible input range scaling （vs ADS8317IDRCR (14-bit single-ended))
設計ノート
Estimated - drive the analog VDD pin from a low-noise LDO (e.g., TPS7A4701 or LM1117-ADJ) rather than from a switching converter node, because any high-frequency ripple directly couples through the reference into the digitized output. Place a 10 uF tantalum in parallel with a 0.1 uF ceramic as close as physically possible to pin 5 VDD, and a separate 0.1 uF + 10 uF network at the external reference (pin 1 REF). When power-saving, pull CONVST low and use the PD pin to enter a few-uA standby. Decoupling should be sized so that the LDO bandwidth does not amplify switching noise into the ADC's analog domain.
Use a four-layer board with dedicated analog and digital ground planes, stitching them only at the ADC's exposed thermal pad (pin 11 EP). Keep the analog input traces (IN+, IN-) short and symmetric to avoid imbalance between the differential pair, and route REF, REF_GND, and IN- on adjacent layers with the same stack-up. Place the reference bypass capacitors within 2-3 mm of the REF pin. Avoid running digital lines (DOUT, DCLOCK, CS/SYNC, CONVST) directly above the analog input traces or the reference network to prevent capacitive coupling of clock edges into the analog front-end.
A common pitfall is connecting the REF pin directly to VDS without a reference IC - this yields noisy readings and thermal drift. Use a low-noise, low-drift reference such as the REF5040 or REF3125 with adequate output decoupling. Another pitfall is omitting the CS/SYNC edge on every conversion: per the TI ADS8318 datasheet, a falling edge on CS/SYNC followed by CONVST is required to frame the conversion properly. Finally, watch the maximum reference voltage - exceeding the absolute maximum REF input range damages the device. Always read the TI datasheet 'Electrical Characteristics' table before finalizing the reference design.
To preserve 16-bit SFDR at 500 kSPS, the DCLOCK trace should be routed with controlled impedance (typically 50 ohm to ground) and terminated close to the ADC. Avoid reflections by keeping DCLOCK below 1/2 of the conversion rate and by source-terminating at the driving MCU. If the host is on a separate board, place a series ferrite bead on each digital line near the ADC. For best PCB-free design, validate signal integrity with an oscilloscope probing the DOUT line with a low-capacitance active probe; look for ringing that exceeds 5% of VLOGIC.
コンプライアンス情報
RoHS compliant per TI product page. Not AEC-Q100 qualified - for ADAS / safety-critical automotive paths, choose an AEC-Q100 ADC such as the ADS7953-Q1 instead. Halogen-free per TI documentation. Reach compliance inferred from TI's environmental statement; refer to TI product folder for the latest SVHC declarations.
