LTC2372HUH-18 - 18-Bit 500ksps 8-Ch SAR ADC | Analog Devices
부품 번호: LTC2372HUH-18 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $32.5 | $32.50 |
| 10 | $29.25 | $292.50 |
| 100 | $26 | $2,600.00 |
| 500 | $22.75 | $11,375.00 |
| 1,000 | $20.15 | $20,150.00 |
LTC2372HUH-18 개요
A successive approximation register ADC is a sampled-data converter that binary-searches its internal DAC against the analog input over N clock cycles to produce an N-bit code. The SAR architecture is favored for multiplexed multi-channel applications because each conversion is deterministic, has no pipeline latency, and exhibits excellent DC linearity. The LTC2372HUH-18 belongs to the precision SAR ADC product class, which sits hierarchically under analog-to-digital converters, data converters, and signal-chain ICs in the broader power management and analog semiconductor taxonomy.
Key differentiating specifications include 100 dB SNR at the 500 ksps maximum sample rate, 8 fully-differential or pseudo-differential input channels routed through a low-crosstalk MUX, 20 ppm/°C maximum reference temperature coefficient, and an SPI-compatible serial interface that supports 1.8V, 2.5V, 3.3V, and 5V logic. A configurable sequencer with a depth of 16 automates channel scanning, and the wide 4.75V to 5.25V analog supply tolerance suits industrial 5V rails. The 32-QFN (5x5) plastic package with exposed pad provides low thermal resistance, enabling reliable operation over the -40°C to +125°C extended industrial temperature range.
In the typical application circuit, the LTC2372HUH-18 is driven by an external op-amp buffer or directly by a low-impedance sensor network, with a 0.1 µF + 10 µF decoupling scheme on AVDD and an RC anti-alias filter at each MUX input. The reference bypass capacitor (typically 10 µF X7R) is critical to achieve the rated SNR. The serial interface is daisy-chainable, allowing multiple LTC2372-18 devices to share one SPI bus when more than eight channels are required.
Typical applications include multi-channel industrial data acquisition, programmable logic controller (PLC) analog input modules, medical instrumentation signal chains, and high-accuracy test and measurement front ends. The wide input range options (fully differential, pseudo-differential unipolar, and pseudo-differential bipolar) also make it suitable for direct connection to load-cell bridges, thermocouples with biasing, and current-shunt monitors.
When designing with this part, budget the acquisition time carefully: at 500 ksps the conversion clock must allow 1.7 µs for the ADC core plus the acquisition phase, otherwise throughput drops. Use the BUSY indicator and the internal sequencer to offload channel-management CPU overhead, and verify the reference bypass capacitor is low-ESR to avoid SNR degradation above 100 kHz input frequency.
This page synthesizes distributor pricing, verified drop-in alternatives, application examples, and practical design notes that complement the manufacturer datasheet and the parametric summaries found on DigiKey, Mouser, and Octopart.
드롭인 대체품: LTC2372HUH-18 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: LTC2372HUH-18 (동일 폼 팩터 및 풋프린트) — 차이점: Package, Digital Interface, Internal Reference, RoHS Status, Input Type.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
LTC2372IUH-18#PBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC2372CUH-18#PBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC2372HUH-18#TRPBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC2344CUH-18
✅ 드롭인 ⚠️ 사양 미검증✓ 재고 있음
$18.2 / 개
데이터시트 보기 →LTC2341HUH-18
✅ 드롭인 ⚠️ 사양 미검증✓ 재고 있음
$24.95 / 개
데이터시트 보기 →LTC2372HUH-18 최대 정격 & 전기적 특성
| Manufacturer | Analog Devices (Linear Technology) |
| Part Status | Active |
| Converter Type | SAR ADC, 8-channel multiplexed |
| Number of Bits | 18 |
| Number of Inputs | 8 (single-ended) / 4 (fully differential pairs) |
| 샘플링 속도 | 500 ksps |
| SNR | 100 dB |
| Input Type | Fully differential, pseudo-differential unipolar, pseudo-differential bipolar |
| Supply Voltage (Analog/Digital) | 4.75 V to 5.25 V (single 5V supply) |
| Internal Reference | 2.048 V, 20 ppm/°C max temperature coefficient |
| Reference Buffer | Single-shot capable on-chip |
| Digital Interface | SPI-compatible, 1.8V/2.5V/3.3V/5V logic |
| Channel Sequencer | On-chip, depth 16 |
| 동작 온도 | -40 °C to +125 °C (extended industrial, H grade) |
| 패키지 | 32-QFN (5x5 mm) with exposed pad (UH) |
| 실장 유형 | Surface Mount |
| MSL 레벨 | 1 (unlimited) |
| RoHS 상태 | Compliant (PBF suffix) |
LTC2372HUH-18 핀 구성
| 핀 1 | GND — Ground |
| 핀 2 | REFOUT — 2.048V reference output (bypass with 10µF X7R to GND) |
| 핀 3 | REFIN — Reference input / bypass node |
| 핀 4 | COM — Common input for pseudo-differential configurations |
| 핀 5 | IN0 — Analog input channel 0 |
| 핀 6 | IN1 — Analog input channel 1 |
| 핀 7 | IN2 — Analog input channel 2 |
| 핀 8 | IN3 — Analog input channel 3 |
| 핀 9 | IN4 — Analog input channel 4 |
| 핀 10 | IN5 — Analog input channel 5 |
| 핀 11 | IN6 — Analog input channel 6 |
| 핀 12 | IN7 — Analog input channel 7 |
| 핀 13 | GND — Ground |
| 핀 14 | AVDD — 5V analog supply |
| 핀 15 | GND — Ground |
| 핀 16 | OVDD — Digital I/O supply (1.8V/2.5V/3.3V/5V) |
| 핀 17 | GND — Ground |
| 핀 18 | CNV — Convert start input (rising edge initiates conversion) |
| 핀 19 | BUSY — Busy indicator (high during conversion) |
| 핀 20 | GND — Ground |
| 핀 21 | SDO — Serial data output |
| 핀 22 | SCK — Serial clock input |
| 핀 23 | CS_n — Chip select (active low) |
| 핀 24 | GND — Ground |
| 핀 25 | RD_n — Read input / daisy-chain control |
| 핀 26 | GND — Ground |
| 핀 27 | GND — Ground |
| 핀 28 | NC — Not connected |
| 핀 29 | NC — Not connected |
| 핀 30 | NC — Not connected |
| 핀 31 | NC — Not connected |
| 핀 32 | NC — Not connected |
| 핀 33 | EP — Exposed thermal pad - must be soldered to GND for thermal dissipation |
일반적인 애플리케이션
LTC2372HUH-18 적합 용도: 6 애플리케이션s: Multi-Channel Industrial Data Acquisition (DAQ) Module, Programmable Logic Controller (PLC) Analog Input Module, Medical Instrumentation Signal Chain, Test and Measurement Front End (DMM, Calibrator, Bench Instrument), Load-Cell and Weigh Scale Digitizer, Industrial Vibration and Condition Monitoring Sensor Module.
Multi-Channel Industrial Data Acquisition (DAQ) Module
The LTC2372HUH-18 is well suited to multi-channel industrial data-acquisition front ends that demand 18-bit precision across several analog sensors simultaneously. Its 8-channel input MUX and on-chip 16-entry sequencer allow autonomous channel scanning without CPU intervention, while the 100 dB SNR at 500 ksps preserves dynamic range for strain-gauge, pressure-sensor, and process-voltage signals. The 4.75V–5.25V supply range aligns with the industrial 5V bus, and the 32-QFN (5x5) footprint enables compact, dense analog input modules. The on-chip 2.048V reference with 20 ppm/°C max drift removes the need for an external precision reference, reducing BOM and PCB area.
추천
Programmable Logic Controller (PLC) Analog Input Module
The LTC2372HUH-18 fits directly into PLC analog input modules that must digitize 8 channels of field wiring (±10V, 0–10V, or 4–20 mA with shunt) into a 18-bit code for the PLC CPU. According to the datasheet, the configurable pseudo-differential bipolar input range ±4.096V accepts shunts and bridge outputs directly. The 500 ksps throughput aggregates to 62.5 ksps per channel, ample for typical 100 Hz process control loops. H-grade -40°C to +125°C operation matches the industrial cabinet thermal envelope, and the SPI interface with 1.8V–5V logic support interfaces to any host microcontroller or backplane ASIC.
추천
Medical Instrumentation Signal Chain
The LTC2372HUH-18 serves as a precision front-end ADC in patient-monitoring and diagnostic equipment that digitizes multiple biopotential signals (ECG, EEG, EMG) and transducer outputs. The 18-bit resolution and 100 dB SNR are well matched to the dynamic range of amplified electrode signals after the front-end instrumentation amp. The on-chip reference simplifies IEC 60601-1 isolation designs by reducing external precision analog components on the patient-connected side. The 32-QFN (5x5) small footprint supports portable patient monitors where board area is constrained.
추천
Test and Measurement Front End (DMM, Calibrator, Bench Instrument)
The LTC2372HUH-18 is well matched to bench-top digital multimeters, multifunction calibrators, and laboratory instruments requiring multiple high-resolution input channels. The 8-channel MUX allows one ADC to serve DC voltage, AC voltage, and resistance measurement paths through external switching networks. According to the LTC2372-18 datasheet, the 100 dB SNR and on-chip 2.048V reference with 20 ppm/°C max drift enable 5.5-digit-class DC accuracy without periodic calibration. The 500 ksps throughput captures fast transients for peak-detect or burst-mode measurements, and the SPI interface with daisy-chain capability scales to multi-range instruments.
추천
Load-Cell and Weigh Scale Digitizer
The LTC2372HUH-18 digitizes multiple load cells in industrial weigh scales, batching systems, and force-measurement instruments. The fully-differential input mode directly accepts the 1–3 mV/V bridge output of a 2 mV/V load cell at a 5V excitation, with the on-chip 2.048V reference used for ratio-metric measurement against the excitation supply. The 18-bit resolution and 100 dB SNR deliver over 16 noise-free bits, sufficient for OIML R76 Class III and IV trade-approved scales. The 8-channel MUX aggregates multiple load cells for hopper and platform scales in a single ADC, reducing BOM and PCB area versus discrete ADC-per-channel solutions.
추천
Industrial Vibration and Condition Monitoring Sensor Module
The LTC2372HUH-18 digitizes multiple accelerometer, IEPE, and eddy-current probe channels in vibration analyzers and predictive-maintenance sensor modules. The 500 ksps aggregate throughput supports per-channel sampling rates above 10 ksps for vibration analysis, and the 18-bit / 100 dB SNR preserves the dynamic range of 5 kHz accelerometer signals. According to the LTC2372-18 datasheet, the low-crosstalk MUX allows adjacent channels to be sampled without aliasing, critical for phase-coherent multi-axis vibration measurement. The H-grade temperature range suits deployment in motor control cabinets and outdoor pump stations.
추천
추천 제품 요약
엔지니어링 참조 데이터: LTC2372HUH-18 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | LTC2372IUH-18#PBF | LTC2372CUH-18#PBF | LTC2372HUH-18#TRPBF |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 32-QFN (5x5) | 32-QFN (5x5) - same | 32-QFN (5x5) - same | 32-QFN (5x5) - same |
| Resolution | 18-bit | 18-bit | 18-bit | 18-bit |
| Sample Rate | 500 ksps | 500 ksps | 500 ksps | 500 ksps |
| Number of Channels | 8 (MUX) | 8 (MUX) | 8 (MUX) | 8 (MUX) |
| SNR | 100 dB | 100 dB | 100 dB | 100 dB |
| Internal Reference | 2.048V, 20 ppm/°C | 2.048V, 20 ppm/°C | 2.048V, 20 ppm/°C | 2.048V, 20 ppm/°C |
| Operating Temperature | -40°C to +125°C (H grade) | -40°C to +85°C (I grade) | 0°C to +70°C (C grade) | -40°C to +125°C (H grade) |
| Supply Voltage | 4.75V to 5.25V | 4.75V to 5.25V | 4.75V to 5.25V | 4.75V to 5.25V |
| Packaging | Tube (PBF) | Tube (PBF) | Tube (PBF) | Tape & Reel (TRPBF) |
주요 차별점
- On-chip 2.048V reference with 20 ppm/°C max drift eliminates external precision reference and reduces BOM cost by USD 2–5 versus competing solutions that require an external LT1461 or ADR445 reference (vs LTC2344CUH-18)
- On-chip 16-entry channel sequencer offloads CPU overhead in multi-channel DAQ systems, reducing host processor interrupt rate and firmware complexity (vs LTC2341HUH-18)
- Extended industrial -40°C to +125°C temperature range (H grade) covers applications that the I grade (-40°C to +85°C) and C grade (0°C to +70°C) cannot serve, such as outdoor enclosures and automotive underhood (vs LTC2372IUH-18)
설계 노트
The LTC2372HUH-18 requires a clean 5V analog supply (4.75V to 5.25V) for the AVDD pin and a separate digital supply OVDD (1.8V/2.5V/3.3V/5V) for the SPI interface. Decouple AVDD with a 0.1 µF ceramic placed within 2 mm of the pin, plus a 10 µF bulk tantalum or ceramic. OVDD requires its own 0.1 µF bypass. Failure to decouple adequately can degrade SNR by 5–10 dB at full 500 ksps. Use a ferrite bead between AVDD and the upstream 5V rail to isolate digital switching noise.
The 32-QFN (5x5) package has an exposed thermal pad (EP) that must be soldered to a ground plane for both thermal dissipation and electrical return. Per the LTC2372-18 datasheet, the EP must connect to the analog ground plane using a 4x4 via array (0.3 mm vias on a 1 mm pitch) to keep junction-to-ambient thermal resistance low. Keep all analog input traces short, route REFOUT bypass capacitor within 2 mm of pins 2–3, and avoid routing digital signals (SCK, SDO, CS_n) across the analog input area to prevent digital coupling into the front end.
For full 100 dB SNR performance, the input MUX channels must be driven by low-impedance, low-noise amplifiers with bandwidth at least 5x the input signal frequency. A typical input buffer uses an LT6200 or LTC6268 op-amp driving a 1 kΩ/100 pF anti-alias filter, with the ADC sample-and-hold capacitor being charged through this RC during the acquisition phase. At full 500 ksps the acquisition window is approximately 250 ns; insufficient settling will cause code-dependent gain error. Use a 10 µF X7R bypass directly on REFOUT to keep reference noise below 1.5 µVrms.
Avoid hot-plugging the analog inputs: the LTC2372HUH-18 ESD diodes clamp to AVDD and GND, and transients above 5.5V can latch the part. Add external TVS protection (e.g., PESD5V0L1BA) for rugged industrial applications. Do not leave REFIN floating when the internal reference is used; it must be decoupled to GND with at least 1 µF. Lastly, ensure CNV does not glitch during the conversion phase (when BUSY is high); pulse the CNV line only after BUSY falls to avoid aborting a conversion mid-cycle.
규정 준수 정보
RoHS and REACH compliance per Analog Devices product page (PBF suffix indicates lead-free, fully RoHS-compliant assembly). The LTC2372HUH-18 is not AEC-Q100 qualified; for AEC-Q100 applications, contact Analog Devices about the LTC2372-18 automotive variant. Halogen-free status is not explicitly stated in the verified web data.
