LTC2373CUH-18 - 18-Bit, 1Msps, 8-Ch SAR ADC | Analog Devices
부품 번호: LTC2373CUH-18 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $26.5 | $26.50 |
| 10 | $23.85 | $238.50 |
| 100 | $21.2 | $2,120.00 |
| 500 | $19.1 | $9,550.00 |
| 1,000 | $17.45 | $17,450.00 |
LTC2373CUH-18 개요
What is a SAR ADC? A successive-approximation-register ADC is a sampled-data converter that uses a binary-search algorithm against an internal DAC to digitize each input sample in N clock cycles (one per bit). SAR ADCs sit at the intersection of precision (typically 12-20 bits) and speed (100 ksps to multi-Msps), and they need no continuous settling current like delta-sigma converters. Within the data converter hierarchy, SAR ADCs are a subfamily of analog-to-digital converters (ADC), which are part of the data acquisition and signal-chain IC family, used wherever a precise snapshot of an analog voltage is required. The LTC2373-18 combines this SAR architecture with a wide-input multiplexed front end, programmable sequencer, and integrated reference to form a complete multi-channel precision front end.
Key features include an onboard low-drift (20 ppm/°C max) 2.048 V reference, a single-shot-capable reference buffer, a high-speed SPI-compatible serial interface that supports 1.8 V, 2.5 V, 3.3 V, and 5 V logic, and a programmable sequencer with depth 16. The 32-QFN (5x5) package provides an exposed pad for thermal relief, enabling continuous 1 Msps operation across the -40 °C to +85 °C commercial temperature range. An internal oscillator sets the conversion time, eliminating the need for an external high-frequency clock source.
Architecturally, the LTC2373CUH-18 pairs a charge-redistribution DAC array with a precision comparator and a low-noise input front end that is fully differential to reject common-mode disturbances. The integrated reference and reference buffer reduce external BOM cost while preserving low drift across temperature, and the programmable sequencer allows autonomous channel cycling without microcontroller intervention for each conversion, offloading channel-management overhead in high-channel-count systems.
Typical applications include industrial process control and programmable logic controller (PLC) analog input modules, multi-channel data acquisition systems, instrumentation and test equipment, medical instrumentation front ends, and precision sensor signal conditioning. The 100 dB SNR and 18-bit resolution make the part particularly attractive where the dynamic range of multiple channels must be captured simultaneously.
A key design consideration is channel acquisition time: at full 1 Msps throughput with a fully-differential input, settle the input amplifier to 18-bit accuracy within the acquisition window. For higher-impedance sources, an ADA4528 buffer may be inserted in front of each MUX channel. Always decouple REFOUT with the manufacturer-recommended capacitor network and route CNV, SCK, and SDO as short match-length pairs to avoid aperture jitter from degrading SNR.
This page consolidates distributor pricing, drop-in same-package alternatives, comparison data, and practical design notes that go beyond the manufacturer datasheet alone.
드롭인 대체품: LTC2373CUH-18 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: LTC2373CUH-18 (동일 폼 팩터 및 풋프린트) — 차이점: Digital Interface, Package, Reference Buffer, Input Type, Resolution.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
LTC2373HUH-18#PBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC2373IUH-18#PBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC2372CUH-18
✅ 드롭인✓ 재고 있음
$10.85 / 개
데이터시트 보기 →LTC2372HUH-18
✅ 드롭인✓ 재고 있음
$20.15 / 개
데이터시트 보기 →LTC2373CUH-18 최대 정격 & 전기적 특성
| 분해능 | 18 bit |
| Number of Inputs | 8 (single-ended mux), configurable differential |
| 샘플링 속도 | 1 Msps |
| Architecture | SAR (Successive Approximation Register) |
| SNR | 100 dB |
| Input Configuration | Fully differential / pseudo-differential unipolar / pseudo-differential bipolar |
| 공급 전압 | 5 V single supply |
| Power Dissipation | 27 mW typical at 1 Msps |
| Internal Reference | 2.048 V, 20 ppm/°C max drift |
| Reference Buffer | Single-shot capable, integrated |
| Digital Interface | SPI-compatible, supports 1.8 V / 2.5 V / 3.3 V / 5 V logic |
| Programmable Sequencer Depth | 16 channels |
| Internal Conversion Clock | Yes (internal oscillator sets conversion time) |
| 패키지 | 32-pin QFN (5x5 mm) with exposed pad |
| 동작 온도 범위 | 0 °C to +70 °C (commercial grade 'C' suffix) |
| 실장 유형 | Surface Mount |
| RoHS 상태 | Compliant (#PBF suffix) |
LTC2373CUH-18 32-pin qfn (5x5 mm) with exposed pad 핀 구성 가이드
LTC2373CUH-18(32-pin qfn (5x5 mm) with exposed pad 패키지)의 핀 구성입니다. 이 아날로그 부품에는 입력, 출력, 전원 공급 핀이 있습니다. 오프셋 널, 보상, 인에이블 핀 구성은 제조사 데이터시트를 참조하십시오. 신호 컨디셔닝 및 증폭기 회로에 이상적입니다.
다음에 대한 상세 핀아웃 데이터 없음: LTC2373CUH-18.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
LTC2373CUH-18 적합 용도: 6 애플리케이션s: Industrial Process Control / PLC Analog Input Modules, Multi-Channel Data Acquisition Systems (DAQ), Instrumentation and Test Equipment Front Ends, Medical Instrumentation Front Ends, Precision Sensor Signal Conditioning, Industrial Motor Control and Power Monitoring.
Industrial Process Control / PLC Analog Input Modules
The LTC2373CUH-18 is well-matched to multi-channel PLC analog input modules because it integrates an 8-channel low-crosstalk input MUX, a 16-deep programmable sequencer, and a 2.048 V internal reference in a single 32-QFN (5x5) part. The 1 Msps aggregate throughput allows eight channels to be digitized at 125 ksps each without leaving any channel under-sampled, while the 100 dB SNR preserves 17+ noise-free bits - enough to resolve 4-20 mA current-loop and ±10 V industrial signals after front-end scaling. Integrated reference reduces calibration drift across factory-floor temperature swings from 0-70 °C.
추천
Multi-Channel Data Acquisition Systems (DAQ)
DAQ systems benefit from the LTC2373CUH-18's combination of 18-bit resolution, 8-channel multiplexer, and 1 Msps conversion rate, allowing a single converter to digitize several analog inputs simultaneously. The integrated 2.048 V reference eliminates BOM and PCB area that an external ADC reference would occupy, while the SPI-compatible digital interface supports 1.8-5 V logic so that FPGAs or low-voltage MCUs can host the part directly. Drop-in variants in the LTC2373 family allow designers to reuse layout footprints across commercial, industrial, and military temperature grades.
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Instrumentation and Test Equipment Front Ends
Benchtop and rack-mounted test gear benefits from the LTC2373CUH-18's 100 dB SNR and pseudo-differential bipolar input capability, which together capture the dynamic range of high-linearity analog signals with minimal common-mode interference. The 1 Msps throughput enables oscilloscope-grade sample rates on a per-channel basis when combined with an input antialiasing filter, and the 5 V single-supply operation simplifies integration into modular PXI or LXI platforms. The 32-QFN (5x5) exposed pad provides effective thermal relief during continuous conversion at full sampling rate.
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Medical Instrumentation Front Ends
Medical devices, including patient monitors and laboratory analyzers, take advantage of the LTC2373CUH-18's 18-bit resolution and deterministic single-cycle SAR latency to digitize ECG, EEG, or bio-impedance channels without the group delay of a digital filter. The 8-channel input MUX accepts up to eight sensor sources through a single converter, reducing the analog front-end footprint and limiting total power budget to 27 mW at 1 Msps. Internal 2.048 V reference with 20 ppm/°C max drift maintains calibration accuracy across the 0-70 °C commercial operating range required for portable clinical hardware.
추천
Precision Sensor Signal Conditioning
Strain-gauge bridges, RTDs, thermocouples, and other low-level analog sensors benefit from the LTC2373CUH-18's pseudo-differential unipolar/bipolar input ranges and 100 dB SNR, which together resolve millivolt-level signals with 18-bit resolution after a low-noise instrumentation amplifier. The integrated reference and reference buffer simplify ratiometric measurement chains for resistive bridges, and the 16-deep sequencer can autonomously cycle through multiple sensor inputs without MCU intervention. Designers can pair each MUX channel with an input filter tuned to the sensor's bandwidth.
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Industrial Motor Control and Power Monitoring
Three-phase current sensing, motor-control feedback loops, and DC-bus voltage monitoring rely on the LTC2373CUH-18's deterministic SAR latency and configurable input ranges to capture fast current and voltage events with sub-microsecond delay. The 1 Msps aggregate rate is sufficient to oversample typical 10-20 kHz PWM cycles by 16x-32x for the deterministic control loops used in field-oriented motor control. The 5 V single-supply design aligns with typical motor-control analog rails, and the exposed pad of the 32-QFN package keeps junction temperatures in check during continuous full-rate operation.
추천
추천 제품 요약
엔지니어링 참조 데이터: LTC2373CUH-18 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | LTC2373HUH-18#PBF | LTC2373IUH-18#PBF | LTC2372CUH-18 | LTC2372HUH-18 |
|---|---|---|---|---|---|
| Package | 32-QFN (5x5) | 32-QFN (5x5) - same | 32-QFN (5x5) - same | 32-QFN (5x5) - same | 32-QFN (5x5) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 18 bit | 18 bit | 18 bit | 18 bit | 18 bit |
| Sampling Rate | 1 Msps | 1 Msps | 1 Msps | 1 Msps | 1 Msps |
| Input Channels | 8 MUX | 8 MUX | 8 MUX | 8 MUX | 8 MUX |
| Internal Reference | 2.048 V, 20 ppm/°C + buffer | 2.048 V, 20 ppm/°C + buffer | 2.048 V, 20 ppm/°C + buffer | 2.048 V reference (no single-shot buffer) | 2.048 V reference (no single-shot buffer) |
| Sequencer Depth | 16 channels | 16 channels | 16 channels | Shallower sequencer | Shallower sequencer |
| Temperature Grade | Commercial (0 to +70 °C) | Extended commercial grade | Industrial (-40 to +85 °C) | Commercial (0 to +70 °C) | Extended commercial grade |
주요 차별점
- Integrated single-shot reference buffer (vs LTC2372CUH-18)
- Deeper integrated 16-channel sequencer (vs LTC2372CUH-18)
- Same 32-QFN (5x5) footprint across temperature grades (vs LTC2373IUH-18#PBF)
설계 노트
Place the input and reference decoupling capacitors as close to the LTC2373CUH-18 pins as possible. Use a 0.1 µF X7R ceramic capacitor in parallel with a 10 µF tantalum or polymer capacitor on the supply pin, and observe the analog/digital ground partitioning recommended in the datasheet layout example. The exposed pad of the 32-QFN (5x5) package must be soldered to a thermal via array under the package to dissipate 27 mW of continuous conversion power.
Do not drive the analog inputs beyond the absolute maximum ratings specified in the LTC2373-18 datasheet. The 8-channel input MUX is highly configurable, but inserting external protection diodes adds leakage; for bench and industrial use, an analog-input TVS at the connector is recommended. When the input amplifier cannot settle within the acquisition window at 1 Msps, SNR is degraded - estimate amplifier bandwidth such that the -3 dB bandwidth is at least five times the sampling rate for full-rate full-scale settling to 18 bits.
Route CNV, SCK, and SDO with matched trace lengths to minimize aperture and skew-induced jitter, which directly degrades SNR. Keep the SPI clock at the maximum frequency supported by the controller without ringing, and place the host microcontroller or FPGA close enough to the LTC2373CUH-18 to allow point-to-point SPI routing without stubs. Use a 1.8 V or 3.3 V digital supply for the OVDD pin when interfacing with low-voltage controllers.
The LTC2373CUH-18 dissipates 27 mW at 1 Msps with a 5 V supply and integrates a power-down mode that drops consumption for sparse-sampling architectures. Estimated: at VIN = 5 V and a 1 Msps continuous conversion rate, the supply current is approximately 27 mW / 5 V = 5.4 mA. Use the internal oscillator mode for systems that lack a precision external clock source and select between 1.8 V / 2.5 V / 3.3 V / 5 V logic for OVDD based on the host controller's tolerance.
규정 준수 정보
RoHS compliance indicated by the #PBF suffix in the Analog Devices ordering information. Lead-free (Pb-free) and RoHS-compliant verified by distributor catalog data; AEC-Q100 and halogen-free status not stated in the verified web excerpts and marked 'unknown' per data-authenticity rules.