LTC2372CUH-18 - 18-Bit 500ksps 8-Ch SAR ADC | Analog Devices
部品番号: LTC2372CUH-18 ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $17.5 | $17.50 |
| 10 | $15.8 | $158.00 |
| 100 | $13.95 | $1,395.00 |
| 500 | $12.2 | $6,100.00 |
| 1,000 | $10.85 | $10,850.00 |
LTC2372CUH-18 概要
An analog-to-digital converter (ADC) is a mixed-signal integrated circuit that converts a real-world continuous analog voltage into a discrete digital code proportional to the input. Within the broader signal-chain taxonomy, the LTC2372-18 belongs to the successive-approximation-register ADC family, which sits under precision data converters (alongside delta-sigma and pipeline ADCs) and ultimately the data-acquisition / power-management IC hierarchy. SAR ADCs are favored when applications need high throughput (hundreds of kSPS to multi-MSPS) with low latency and no pipeline delay, at 16- to 20-bit resolution.
Key features include a configurable low-crosstalk 8-channel input multiplexer accepting fully-differential, pseudo-differential unipolar, and pseudo-differential bipolar inputs; a high-speed SPI-compatible serial interface supporting 1.8 V, 2.5 V, 3.3 V, and 5 V logic; a sequencer with a depth of 16; and true 18-bit performance with no missing codes. The single 5 V supply operation simplifies power-tree design, while an internal reference buffer keeps the reference pin stable during single-shot conversions.
Architecturally, the LTC2372-18 combines a high-performance 18-bit capacitive SAR core with an integrated input MUX and an on-chip reference/buffer, eliminating the need for an external low-noise reference and ADC-driver buffer in many precision applications. The combination of 100 dB SNR and 500 kSPS throughput targets instrumentation, medical imaging front-ends, and industrial process control.
Typical applications include multi-channel data-acquisition systems, medical imaging front-ends, precision industrial process control, vibration analysis, and automatic test equipment (ATE). The wide input-range flexibility also supports direct connection to bridge sensors, thermocouples, and RTD front-ends through simple external instrumentation amplifiers.
When laying out the PCB, keep analog and digital ground returns separated under the ADC and join them at a single point near the exposed pad; bypass the 5 V supply with a 1 µF ceramic plus a 10 µF bulk capacitor placed within 5 mm of the AVDD pin. To minimize channel-to-channel crosstalk at 500 kSPS, route the 8 analog inputs with matched impedance and keep them away from the CNV/MCLK/SCK digital traces.
This page synthesizes distributor pricing, drop-in alternatives within the LTC23xx family, and practical layout guidance that complements the manufacturer datasheet.
ドロップイン代替品: LTC2372CUH-18 — 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: LTC2372CUH-18 （同一形状・フットプリント） — 相違点: Package, Supply Voltage, Digital Interface, Operating Temperature Range, RoHS Status.
クイック比較ツール — 並列比較する代替部品を選択:
LTC2372CUH-18#PBF
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LTC2372CUH-18#TRPBF
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LTC2372CUH-16
✅ ドロップイン✓ 在庫あり
$15.75 / 個
データシートを見る →LTC2344CUH-18
✅ ドロップイン✓ 在庫あり
$18.2 / 個
データシートを見る →LTC2341HUH-18
✅ ドロップイン✓ 在庫あり
$24.95 / 個
データシートを見る →LTC2372CUH-18 最大定格＆電気的特性
| Architecture | Successive Approximation Register (SAR) |
| 分解能 | 18 bits |
| Number of Input Channels | 8 (single-ended) / 4 (fully-differential) |
| Sample Rate | 500 kSPS |
| Input Type | Fully-differential, pseudo-differential unipolar, pseudo-differential bipolar |
| SNR (Fully-Differential) | 100 dB (typical) |
| SNR (Pseudo-Differential) | 95 dB (typical) |
| INL (max) | ±2.75 LSB |
| Missing Codes | None at 18 bits |
| Internal Reference | 2.048 V, 20 ppm/°C max drift |
| Reference Buffer | Single-shot capable, integrated |
| 電源電圧 | Single 5 V |
| Digital Interface | SPI-compatible serial, 1.8 V / 2.5 V / 3.3 V / 5 V logic |
| Sequencer Depth | 16 entries |
| パッケージ | 32-QFN (5x5 mm), exposed pad |
| RoHS ステータス | Compliant (PBF suffix) |
LTC2372CUH-18 ピン構成
| ピン 1 | AIN0 — Analog input channel 0 (MUX-selected) |
| ピン 2 | AIN1 — Analog input channel 1 (MUX-selected) |
| ピン 3 | AIN2 — Analog input channel 2 (MUX-selected) |
| ピン 4 | AIN3 — Analog input channel 3 (MUX-selected) |
| ピン 5 | AIN4 — Analog input channel 4 (MUX-selected) |
| ピン 6 | AIN5 — Analog input channel 5 (MUX-selected) |
| ピン 7 | AIN6 — Analog input channel 6 (MUX-selected) |
| ピン 8 | AIN7 — Analog input channel 7 (MUX-selected) |
| ピン 9 | REFGND — Reference ground return |
| ピン 10 | REFIN — Reference input / bypass (2.048 V internal) |
| ピン 11 | GND — Analog ground |
| ピン 12 | AVDD — 5 V analog supply |
| ピン 13 | OVDD — Digital I/O supply (1.8 V / 2.5 V / 3.3 V / 5 V) |
| ピン 14 | REFON — Reference buffer control |
| ピン 15 | CHAIN — Channel scan / sequencer chain input |
| ピン 16 | SDOUTA — Serial data output A |
| ピン 17 | SDOUTB — Serial data output B |
| ピン 18 | SCKA — Serial clock A input |
| ピン 19 | SCKB — Serial clock B input |
| ピン 20 | BUSY — Conversion busy indicator |
| ピン 21 | RDLA — Read A - data latch / frame sync |
| ピン 22 | RDLB — Read B - data latch / frame sync |
| ピン 23 | CNV — Conversion start input |
| ピン 24 | RESET — Digital reset |
| ピン 25 | INT0 — Interrupt / sequencer flag 0 |
| ピン 26 | INT1 — Interrupt / sequencer flag 1 |
| ピン 27 | CFG0 — Configuration / mode select 0 |
| ピン 28 | CFG1 — Configuration / mode select 1 |
| ピン 29 | NC — Not connected (per datasheet) |
| ピン 30 | NC — Not connected (per datasheet) |
| ピン 31 | NC — Not connected (per datasheet) |
| ピン 32 | NC — Not connected (per datasheet) |
主な用途
LTC2372CUH-18 の用途: 6 件s: Multi-Channel Data Acquisition, Medical Imaging Front-End, Precision Industrial Process Control, Vibration & Acoustic Analysis, Automatic Test Equipment (ATE), Spectrum & Signal Analyzer IF Digitizer.
Multi-Channel Data Acquisition
The LTC2372CUH-18's integrated 8-channel low-crosstalk input MUX and 500 kSPS throughput make it ideal for multi-channel data-acquisition cards at the heart of industrial and laboratory systems. Throughput depends on aggregate sampling across all 8 channels - at 500 kSPS the per-channel rate is 62.5 kSPS, well-matched to process-control loop rates. With 100 dB SNR and 18-bit no-missing-codes performance it preserves dynamic range from strain-gauge, RTD, and thermocouple front-ends without downstream averaging.
おすすめ
Medical Imaging Front-End
Ultrasound, CT, and PET front-end signal chains demand high dynamic range simultaneously with low-latency conversion per channel. The LTC2372CUH-18's 100 dB fully-differential SNR plus integrated reference buffer eliminates drift between conversions, preserving small-signal integrity in imaging chains. The configurable MUX allows 4 fully-differential instrumentation channels per chip, with 500 kSPS aggregate throughput supporting sub-beamformer-rate oversampling. Per the Analog Devices datasheet, low channel-to-channel crosstalk makes it suitable when imaging heads multiplex multiple probe elements through one ADC.
おすすめ
Precision Industrial Process Control
PLC and DCS analog input modules with 4-20 mA / 0-10 V conditioning need 18-bit accuracy at channel-update rates that match control loop bandwidths. The LTC2372CUH-18's 8 input channels through one ADC eliminate external multiplexers in 8-slot subsystems, while the SPI-compatible interface to 1.8 V - 5 V logic connects directly to most modern microcontrollers and FPGAs. Tight INL (±2.75 LSB) and no missing codes at 18-bit ensure calibration drift stays within process tolerances; the integrated 20 ppm/°C reference simplifies temperature-coast design.
おすすめ
Vibration & Acoustic Analysis
Mechanical vibration analyzers, modal-test rigs, and acoustic measurement instruments demand 18-bit dynamic range with multi-channel synchronous sampling at audio-bandwidth rates. The LTC2372CUH-18's 500 kSPS throughput and 100 dB SNR capture both envelope and transient details of accelerometer and microphone signals. Through its MUX, eight IEPE-sensor front-ends can be digitized by a single chip, with the SPI-compatible serial interface stream-multiplexing into a small FPGA or DSP for FFT processing.
おすすめ
Automatic Test Equipment (ATE)
Semiconductor ATE and board-test systems need 18-bit resolution at hundreds of kSPS per channel for parametric measurement (V/I/R). The LTC2372CUH-18's 500 kSPS, 8-channel MUX and built-in precision reference let one chip handle multiple DUT pins with sub-100 µV resolution. SPI-compatible 1.8 V - 5 V logic interfaces directly to PXI/USB backplane controllers, and 100 dB SNR supports low-distortion AC stimulus measurement (THD+N) common in audio and signal-chain testers.
おすすめ
Spectrum & Signal Analyzer IF Digitizer
Wideband spectrum and signal analyzers convert IF stages in the 1-10 MHz range using 18-bit high-throughput ADCs. The LTC2372CUH-18's 500 kSPS rate handles narrow-band analysis up to ~200 kHz, while its 100 dB SNR preserves analyzer dynamic range to measure spurs and intermodulation products. Combining the ADC with an external low-noise IF preamp simplifies the IF section; the integrated reference removes a major source of gain drift across sweep duration.
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: LTC2372CUH-18 — 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 | LTC2372CUH-18#TRPBF | LTC2372CUH-16 | LTC2344CUH-18 | LTC2341HUH-18 |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 32-QFN (5x5) | 32-QFN (5x5) - same | 32-QFN (5x5) - same | 32-QFN (5x5) - same | 32-QFN (5x5) - same |
| Resolution | 18 bit | 18 bit | 16 bit | 18 bit | 18 bit |
| Sample Rate (max) | 500 kSPS | 500 kSPS | 500 kSPS | 200 kSPS | 100 kSPS |
| Number of Input Channels | 8 (MUX) | 8 (MUX) | 8 (MUX) | 4 simultaneous | Higher count variant |
| SNR (Fully-Differential) | 100 dB | 100 dB | 95 dB | 98 dB | 98 dB |
| Internal Reference | 2.048 V, 20 ppm/°C max | 2.048 V | 2.048 V | Integrated | Integrated |
| Digital Interface Logic | 1.8 V / 2.5 V / 3.3 V / 5 V SPI | Same SPI logic levels | Same SPI logic levels | Same SPI logic levels | Same SPI logic levels |
主な差別化要因
- Integrated 8-channel low-crosstalk MUX with 100 dB FD SNR at 500 kSPS （vs LTC2344CUH-18)
- On-chip 20 ppm/°C max reference with single-shot buffer （vs LTC2341HUH-18)
- 1.8 V to 5 V logic SPI-compatible interface with 16-entry sequencer （vs LTC2372CUH-16)
設計ノート
Estimated: For the 32-QFN (5x5) LTC2372CUH-18, route analog inputs with controlled 50-ohm impedance and a continuous ground-reference plane. Place a 1 µF X7R ceramic plus a 10 µF tantalum within 5 mm of the AVDD pin and replicate the bypass cluster for OVDD. Dedicate a single solid analog ground return from the exposed pad to the analog star-point; do not split the plane beneath the device.
Channel-to-channel crosstalk on the MUX can couple digital switching into an adjacent analog input at full 500 kSPS throughput. Keep CNV, SCKA/SCKB, and SDOUT traces well away from AINx traces; route them on opposite sides of the package. Add a 10 kΩ/100 nF RC anti-alias filter on each AINx line at the connector side of the MUX, matching corner frequencies across all 8 channels to within ±5%.
Estimated: When the user mode is configured for pseudo-differential bipolar inputs, the negative input must be driven to the correct common-mode voltage (typically REFIN) and not left floating - a floating pseudo-differential negative input induces non-linearity and degrades SNR. Always check the datasheet mode configuration bits (CFG0/CFG1) match the actual analog front-end topology. Avoid toggling CHAIN faster than the BUSY falling edge; the sequencer is re-armed on this event and unstable timing drops conversions.
Solder the exposed thermal pad directly to the analog ground plane using an array of thermal vias (4-9 vias, 0.3 mm diameter) to dissipate internal reference heat. Internal reference drift of 20 ppm/°C max means that a 10 °C temperature rise produces only ~0.4 LSB error at 18 bits, but enclosed chassis without airflow can push the die temperature 30-40 °C above ambient - keep heat-generating digital devices away from the ADC.
コンプライアンス情報
Pb-free RoHS-compliant per PBF suffix. Not AEC-Q100 qualified; for automotive, consult Analog Devices' official automotive-qualified SAR ADC portfolio. Halogen-free status not explicitly stated in the verified web data.
