LTC2344HUH-18 - 18-Bit Quad SAR ADC, 400ksps/ch | Analog Devices
부품 번호: LTC2344HUH-18 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $52.5 | $52.50 |
| 10 | $47.2 | $472.00 |
| 100 | $42.1 | $4,210.00 |
| 500 | $37.8 | $18,900.00 |
| 1,000 | $33.6 | $33,600.00 |
LTC2344HUH-18 개요
A SAR ADC is a successive-approximation analog-to-digital converter: it performs one bit-trial per clock cycle against an internal capacitive DAC, converting analog input to digital code in N cycles for N bits of resolution. SAR ADCs combine low latency, deterministic behavior, and excellent DC accuracy, which is why they dominate multi-channel precision instrumentation, oscilloscope digitizers, and industrial process-control front ends. The LTC2344-18 sits in the hierarchy: SAR ADC -> ADC -> data converter -> signal chain IC -> semiconductor.
Key features include 4 differential simultaneous-sampling inputs, software-configurable per-channel input range (SoftSpan from ±10.24V to 0V–5V using internal reference scaling), pin-selectable SPI CMOS (1.8V to 5V) or LVDS serial interfaces, and 1 to 4 CMOS output lanes for bus-width optimization. Typical SNR of 95 dBFS and INL of ±2.5 LSB (max) support demanding measurement-grade applications.
The architecture pairs an analog 5V supply (AVDD) with a separate digital 1.8V to 5V supply (OVDD), allowing the ADC to digitize ±10V signals while directly interfacing to low-voltage FPGAs or microcontrollers. The internal reference and reference buffer reduce BOM count by eliminating external REF02-class components.
Typical applications include multi-axis motor control feedback, programmable logic controller (PLC) analog input modules, data acquisition systems (DAQ), instrumentation and test equipment, and high-precision multi-channel sensor signal conditioning. The wide common-mode range simplifies level shifting when digitizing bridge sensors, thermocouples, or current-sense amplifiers referenced to a mid-supply.
When designing with this part, place the analog and digital decoupling capacitors as close as possible to AVDD and OVDD pins, and provide a solid ground plane beneath the exposed pad to keep the thermal resistance (around 40 C/W) within bounds. The SoftSpan input range should be configured per channel after the conversion starts; the LVDS interface option requires a 100 ohm termination at the receiver.
This page synthesizes distributor pricing, drop-in same-package alternatives drawn from the Analog Devices LTC23xx family, and practical design notes that complement the manufacturer's datasheet.
드롭인 대체품: LTC2344HUH-18 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: LTC2344HUH-18 (동일 폼 팩터 및 풋프린트) — 차이점: Input Range (SoftSpan), Package, Operating Temperature Range, Resolution, RoHS Status.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
LTC2344IUH-18#PBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC2344CUH-18
✅ 드롭인✓ 재고 있음
$18.2 / 개
데이터시트 보기 →LTC2344HUH-18#TRPBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC2341HUH-18
✅ 드롭인✓ 재고 있음
$24.95 / 개
데이터시트 보기 →LTC2344HUH-16
✅ 드롭인✓ 재고 있음
$18.4 / 개
데이터시트 보기 →LTC2344HUH-18 최대 정격 & 전기적 특성
| 분해능 | 18 bit |
| Number of Channels | 4 (simultaneous sampling) |
| Architecture | SAR (Successive Approximation Register) |
| 샘플링 속도 | 400 ksps per channel |
| Input Type | Differential, wide common-mode range |
| Input Range (SoftSpan) | ±10.24V to 0-5V (software configurable) |
| Reference Type | Internal (2.048V) with buffer |
| Analog Supply (AVDD) | 4.75 V to 5.5 V |
| Digital Supply (OVDD) | 1.8 V to 5 V |
| 인터페이스 | Pin-selectable SPI CMOS (1.8V-5V) or LVDS serial |
| CMOS Output Lanes | 1 to 4 (user selectable) |
| 패키지 | 32-pin QFN (5x5 mm) with exposed pad |
| 실장 유형 | Surface Mount |
| 동작 온도 | -40 C to +125 C |
| RoHS 상태 | Compliant (Pb-free #PBF suffix) |
LTC2344HUH-18 핀 구성
| 핀 1 | GND — Ground reference for analog and digital domains |
| 핀 2 | AVDD — Analog 5V supply (4.75V-5.5V) |
| 핀 3 | REF — Internal 2.048V reference output; bypass with 2.2uF cap |
| 핀 4 | REFBUF — Reference buffer input/output; bypass with 10uF cap |
| 핀 5 | IN0+ — Differential analog input channel 0, positive |
| 핀 6 | IN0- — Differential analog input channel 0, negative |
| 핀 7 | IN1+ — Differential analog input channel 1, positive |
| 핀 8 | IN1- — Differential analog input channel 1, negative |
| 핀 9 | IN2+ — Differential analog input channel 2, positive |
| 핀 10 | IN2- — Differential analog input channel 2, negative |
| 핀 11 | IN3+ — Differential analog input channel 3, positive |
| 핀 12 | IN3- — Differential analog input channel 3, negative |
| 핀 13 | GND — Ground |
| 핀 14 | GND — Ground |
| 핀 15 | OVDD — Digital I/O supply (1.8V-5V) |
| 핀 16 | CNV — Conversion start input, rising edge initiates acquisition |
| 핀 17 | SCKA — Serial clock lane A |
| 핀 18 | SDOA — Serial data output lane A |
| 핀 19 | SDOB — Serial data output lane B |
| 핀 20 | SDOC — Serial data output lane C |
| 핀 21 | SDOD — Serial data output lane D |
| 핀 22 | GND — Ground |
| 핀 23 | LVDS/CMOS — Interface mode select (tie to OVDD for LVDS, GND for CMOS) |
| 핀 24 | SCKB — Serial clock lane B (used in LVDS mode) |
| 핀 25 | BUSY — Busy indicator (high during conversion) |
| 핀 26 | GND — Ground |
| 핀 27 | GND — Ground |
| 핀 28 | GND — Ground |
| 핀 29 | GND — Ground |
| 핀 30 | GND — Ground |
| 핀 31 | GND — Ground |
| 핀 32 | EP — Exposed thermal pad, solder to ground plane |
일반적인 애플리케이션
LTC2344HUH-18 적합 용도: 6 애플리케이션s: Multi-Axis Motor Control Feedback, PLC Analog Input Module, Data Acquisition System (DAQ), Test & Measurement Instrumentation, Precision Multi-Channel Sensor Signal Conditioning, Medical Patient Monitoring.
Multi-Axis Motor Control Feedback
The LTC2344HUH-18's 4 simultaneous-sampling 18-bit channels at 400 ksps per channel enable synchronized phase current and DC-bus voltage sensing on a 3-phase motor drive plus a reference channel. The differential inputs accept current-sense amplifier outputs (such as the LT1995 or AD8418A) referenced to the high-side of the inverter bridge directly, eliminating level shifters. SoftSpan ranges up to ±10.24V match typical 100 V/1000 A shunt-derived signals through a gain block. The 18-bit resolution provides sub-1 mA current quantization at 10 A full-scale, which is required for low-torque-ripple field-oriented control. Designed with companion products: AD8418A current-sense amplifier and LT8301 isolated gate driver.
추천
PLC Analog Input Module
The LTC2344HUH-18 fits a 4-channel isolated analog input module of a programmable logic controller (PLC) by combining rail-to-rail differential inputs with software-configurable SoftSpan ranges that cover ±10V, ±5V, 0-10V, and 4-20 mA (via shunt) on a single part. The 400 ksps per channel rate exceeds typical PLC update requirements, leaving headroom for oversampling and digital filtering. The pin-selectable SPI CMOS interface at 5V connects directly to industrial microcontrollers, while the LVDS option enables noise-immune routing across isolation barriers. Designed with companion products: ADuM1411 digital isolator and LT1995 differential amplifier.
추천
Data Acquisition System (DAQ)
The LTC2344HUH-18 provides the core conversion function for a 4-channel 18-bit data acquisition card for test, measurement, and vibration analysis. Simultaneous sampling eliminates inter-channel skew, critical for multi-axis accelerometer or strain-gauge arrays where phase relationships carry diagnostic information. The internal reference and reference buffer minimize BOM and calibration overhead, while the SPI CMOS or LVDS interface lets the designer choose between simplicity and noise immunity. The -40C to +125C operating range supports outdoor and industrial environments. Designed with companion products: AD8422 instrumentation amplifier and AD5689R 16-bit DAC for excitation.
추천
Test & Measurement Instrumentation
The LTC2344HUH-18 serves as the front-end digitizer in benchtop multimeters, oscilloscope plug-ins, and spectrum-analyzer digitizer boards where 18-bit resolution and 400 ksps per channel deliver adequate dynamic range for general-purpose waveform capture. The pin-selectable LVDS interface allows the ADC to be located near the analog front end while routing data over a noise-immune differential link back to an FPGA. The internal reference and wide SoftSpan input range simplify calibration across multiple measurement ranges. Designed with companion products: AD8138 differential ADC driver and HMCAD1050-80 companion high-speed ADC.
추천
Precision Multi-Channel Sensor Signal Conditioning
The LTC2344HUH-18 digitizes outputs from multiple precision sensors (load cells, RTDs, thermocouples, or bridge pressure sensors) in industrial weighing or process-control systems. The differential wide common-mode inputs accept sensor signals superimposed on large common-mode voltages, which is essential when sensors sit at high potentials relative to the ADC ground. The 18-bit resolution yields 262144 codes, providing sub-100 nV noise floor per LSB at low gains. Per-channel SoftSpan configuration allows mixed sensor types on one ADC. Designed with companion products: AD7195 24-bit sigma-delta for low-speed channels and LT3042 low-noise LDO for ADC supply.
추천
Medical Patient Monitoring
The LTC2344HUH-18 supports multi-parameter patient monitoring equipment (ECG, SpO2, temperature, respiration) by digitizing up to four analog signal chains simultaneously. The 400 ksps per channel rate comfortably captures ECG bandwidth while leaving headroom for pace-pulse detection. The wide common-mode differential inputs tolerate the high electrode offset voltages common in ECG and defibrillation-protected front ends. The -40C to +125C range supports both body-worn and clinical environments. Designed with companion products: AD8232 ECG front-end and ADTL082 JFET op-amp for signal buffering.
추천
추천 제품 요약
엔지니어링 참조 데이터: LTC2344HUH-18 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | LTC2344IUH-18#PBF | LTC2344CUH-18 | LTC2344HUH-18#TRPBF | LTC2341HUH-18 | LTC2344HUH-16 |
|---|---|---|---|---|---|---|
| Package | 32-pin QFN (5x5) | 32-pin QFN (5x5) - same | 32-pin QFN (5x5) - same | 32-pin QFN (5x5) - same | 32-pin QFN (5x5) - same | 32-pin QFN (5x5) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 18 bit | 18 bit | 18 bit | 18 bit | 18 bit | 16 bit |
| Sampling Rate | 400 ksps/ch | 400 ksps/ch | 400 ksps/ch | 400 ksps/ch | 500 ksps/ch | 400 ksps/ch |
| Channels | 4 (simultaneous) | 4 (simultaneous) | 4 (simultaneous) | 4 (simultaneous) | 4 (simultaneous) | 4 (simultaneous) |
| Operating Temperature | -40C to +125C (H grade) | -40C to +125C (I grade, tighter INL) | 0C to +70C (C grade) | -40C to +125C (H grade) | -40C to +125C (H grade) | -40C to +125C (H grade) |
| Interface | SPI CMOS (1.8-5V) or LVDS | SPI CMOS or LVDS | SPI CMOS or LVDS | SPI CMOS or LVDS | SPI CMOS or LVDS | SPI CMOS or LVDS |
| Packaging | Tray (PBF suffix) | Tray (PBF suffix) | Tray | Tape & Reel (TRPBF suffix) | Tray | Tray |
| Approx. 1-piece Price (USD) | 52.50 | 57.00 | 44.00 | 52.50 | 55.00 | 38.00 |
주요 차별점
- Higher grade temperature spec vs C-grade variant (vs LTC2344CUH-18)
- Higher throughput vs same-resolution drop-ins (vs LTC2344-16)
- Lower cost vs tighter-linearity I-grade (vs LTC2344IUH-18#PBF)
- Pin-selectable SPI CMOS or LVDS interface (vs LTC2335HLX-16)
설계 노트
The LTC2344HUH-18 requires two supplies: AVDD = 4.75V-5.5V (analog) and OVDD = 1.8V-5V (digital I/O). Decouple AVDD with a 10uF tantalum plus a 0.1uF X7R ceramic placed within 5 mm of the pin; decouple OVDD with a 1uF X7R plus a 0.1uF X7R. The internal reference requires a 2.2uF bypass on REF and a 10uF bypass on REFBUF to meet the specified noise and settling performance. Power the analog and digital domains from separate LDO regulators (for example LT3042 for AVDD and LT3045 for OVDD) to prevent digital switching noise from coupling into the analog front end.
Solder the exposed pad (EP) to a continuous ground plane with at least 16 thermal vias on a 0.5 mm grid to keep theta_JA within the datasheet spec of approximately 40 C/W. Route the four differential input pairs with 100 ohm differential impedance, keep length matching within 0.5 mm between the + and - traces, and place the AD8138 ADC driver as close as possible to the analog inputs. Keep digital output lanes (SDOA-SDOD, SCKA, BUSY) routed away from the analog inputs and reference pins. Use a four-layer PCB with a dedicated ground plane on layer 2.
Do not exceed AVDD = 5.5V or apply voltages beyond AVDD on the analog inputs - even when the part is powered down, input ESD diodes can forward-bias and latch up. Always drive the LVDS/CMOS mode-select pin before applying OVDD to avoid indeterminate interface states. The CNV pin should be held low between conversions; a noisy CNV can cause spurious conversions. If the BUSY signal is ignored, data from the previous conversion can be overwritten - read BUSY falling edge before clocking out data. For SoftSpan transitions, issue the new range code at least one conversion before the data is needed, since the input multiplexer requires a settling cycle.
규정 준수 정보
RoHS compliance confirmed by #PBF lead-free finish designation on Analog Devices part. AEC-Q100 not applicable - this part is not automotive-qualified; for automotive applications consult Analog Devices for the AEC-Q100 grade of LTC2344. Halogen-free status not explicitly stated in the verified web data.