LTC2381IMS-16 - 16-Bit 250ksps SAR ADC | Analog Devices
부품 번호: LTC2381IMS-16 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $7.95 | $7.95 |
| 10 | $7.15 | $71.50 |
| 100 | $6.2 | $620.00 |
| 500 | $5.45 | $2,725.00 |
| 1,000 | $4.8 | $4,800.00 |
LTC2381IMS-16 개요
A SAR ADC is a type of analog-to-digital converter that uses a binary search algorithm through a capacitive DAC and a comparator to digitize an analog input one code-word at a time. SAR ADCs sit in the broader converter hierarchy alongside delta-sigma, pipeline, and flash ADCs, and are favored when designers need a combination of high sampling rate, low latency, and excellent DC linearity. The LTC2381-16 belongs to the precision data converter IC category and serves in the wider role of signal-chain interface between analog sensors/signals and digital processors, MCUs, or FPGAs.
Key features include a high-speed SPI-compatible serial interface that supports 1.8V, 2.5V, 3.3V, and 5V logic and a daisy-chain mode for multi-converter synchronization. The device exhibits no cycle latency between conversions, achieves 92 dB SNR (typical), and integrates a low-drift internal reference. The I-grade (–40°C to +85°C) MSOP-16 package is optimized for compact, space-constrained designs.
Technically, the LTC2381-16 uses a charge-redistribution capacitive DAC architecture with internal calibration to deliver 16-bit linearity. Its wide common-mode input range simplifies front-end driver design, while the true-differential input rejects common-mode noise from industrial sensor bridges. The combination of low power (3.25 mW), small package, and high throughput makes it well suited to multiplexed multi-channel systems where one ADC serves several analog inputs.
Typical applications include industrial process control and instrumentation, seismic data acquisition, portable medical instrumentation, ATE (automatic test equipment) signal capture, and precision weigh scales. The combination of 250 ksps speed and 16-bit accuracy suits control loops where loop latency matters more than absolute noise floor.
When designing with this device, ensure adequate input driver bandwidth and a low-impedance reference decoupling network. Use the daisy-chain mode when multiple LTC2381-16 devices must sample simultaneously across a multi-board system.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes that go beyond the manufacturer datasheet to help engineers choose, source, and implement the LTC2381IMS-16 quickly.
드롭인 대체품: LTC2381IMS-16 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
LTC2381IMS-16#TRPBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC2381CIMS-16#PBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC2381CMS-16#PBF
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
LTC2381IMS-16
✅ 드롭인✓ 재고 있음
$4.8 / 개
데이터시트 보기 →LTC2381IMS-16 최대 정격 & 전기적 특성
| 분해능 | 16 bit |
| Number of Channels | 1 |
| ADC Architecture | SAR (Successive Approximation Register) |
| 샘플링 속도 | 250 ksps |
| 공급 전압 | 2.5 V (single supply) |
| Analog Input Range | ±2.5 V fully differential |
| INL (max) | ±2 LSB |
| Missing Codes | No missing codes at 16 bits |
| Power Consumption | 3.25 mW |
| Serial Interface | SPI-compatible, 1.8/2.5/3.3/5 V logic |
| Daisy-Chain Mode | Yes |
| Cycle Latency | 0 (no latency) |
| 동작 온도 | -40°C to +85°C (I-grade) |
| 패키지 | 16-pin MSOP |
| 실장 유형 | Surface Mount |
| RoHS 상태 | Compliant (PBF suffix) |
LTC2381IMS-16 핀 구성
| 핀 1 | REF — Reference voltage input/output (internal reference) |
| 핀 2 | IN+ — Positive differential analog input |
| 핀 3 | IN- — Negative differential analog input |
| 핀 4 | GND — Ground |
| 핀 5 | VDD — 2.5V analog supply |
| 핀 6 | OVDD — Digital I/O supply (1.8V/2.5V/3.3V/5V) |
| 핀 7 | GND — Digital ground |
| 핀 8 | SCK — Serial clock input (SPI) |
| 핀 9 | SDO — Serial data output (SPI) |
| 핀 10 | SDI — Serial data input (SPI daisy-chain) |
| 핀 11 | CNV — Conversion / chip select input |
| 핀 12 | BUSY — Conversion busy output |
| 핀 13 | GND — Ground |
| 핀 14 | GND — Ground |
| 핀 15 | GND — Ground |
| 핀 16 | GND — Ground / exposed pad thermal connection |
일반적인 애플리케이션
LTC2381IMS-16 적합 용도: 6 애플리케이션s: Industrial Process Control and Instrumentation, Seismic and Geophysical Data Acquisition, Portable Medical Instrumentation, Automatic Test Equipment (ATE) Signal Capture, Precision Weigh Scales and Force Measurement, Multiplexed Multi-Channel Data Acquisition Systems.
Industrial Process Control and Instrumentation
The LTC2381IMS-16 fits industrial process control applications because its 16-bit resolution with ±2 LSB INL and 250 ksps throughput provide the linearity and speed required for closed-loop control. The ±2.5 V fully differential input range accepts signals directly from differential bridges, RTD front-ends, and instrumentation amplifiers without additional level shifting. The 3.25 mW power consumption allows dense, multi-channel PLC analog input modules where many ADCs share a backplane and thermal budget is constrained. Compared with a delta-sigma ADC of equivalent resolution, the SAR's 0-cycle latency delivers deterministic conversion time, which simplifies control loop timing. The –40°C to +85°C industrial temperature grade and MSOP-16 footprint suit compact DIN-rail-mounted analog cards. Daisy-chain SPI mode enables multiple LTC2381IMS-16 chips to share one data line across a multi-board system.
추천
Seismic and Geophysical Data Acquisition
The LTC2381IMS-16 supports seismic and geophysical acquisition where 16-bit linearity at 250 ksps meets the dynamic range requirements of vibration, accelerometer, and geophone front-ends. The true-differential ±2.5 V input range accepts the differential signals from piezo and MEMS accelerometers directly, and the high common-mode rejection suppresses ground-loop noise typical of field-deployed sensor cables. Low 3.25 mW power is essential for battery-powered or solar-powered remote acquisition nodes. The SPI-compatible serial interface with daisy-chain mode synchronizes multiple ADCs across multi-channel arrays, ensuring deterministic sample timing across geophone strings. The MSOP-16 footprint enables compact sensor-head modules where PCB area is at a premium. Compared with audio-band delta-sigma ADCs, the SAR's wider analog input bandwidth preserves transient and impulse content critical to seismic event detection.
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Portable Medical Instrumentation
The LTC2381IMS-16 suits portable medical instrumentation including patient monitors, pulse oximeters, and handheld diagnostic devices. Its 16-bit resolution and ±2 LSB INL provide the measurement accuracy required for vital-sign acquisition, and the 3.25 mW power consumption is critical for battery-operated designs where every milliwatt impacts runtime. The MSOP-16 footprint fits handheld enclosures where PCB real estate is constrained, and the –40°C to +85°C industrial temperature range covers clinical and home-health environments. The SAR architecture's 0-cycle latency makes it ideal for real-time control loops, such as active noise cancellation in hearing aids or stimulus-response measurement in electrophysiology. The SPI interface at up to 5 V logic compatibility simplifies connection to common low-power MCUs without level shifters, reducing BOM cost.
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Automatic Test Equipment (ATE) Signal Capture
The LTC2381IMS-16 is well suited to ATE signal capture applications requiring high linearity and deterministic sampling. Its ±2 LSB INL and no-missing-codes guarantee ensures test measurement integrity for production-line ATE, while the 250 ksps throughput captures waveform events with sufficient temporal resolution for many bench-instrument and rack-instrument use cases. The 0-cycle latency means the ADC can be embedded directly into stimulus-response loops without pipeline-induced timing errors. The MSOP-16 package allows dense multi-channel ATE pin-electronics cards with many ADC channels per slot. The daisy-chain SPI mode synchronizes multiple LTC2381IMS-16 channels across a backplane, simplifying FPGA or MCU interface design. Low 3.25 mW power keeps total card power within typical ATE chassis thermal budgets.
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Precision Weigh Scales and Force Measurement
The LTC2381IMS-16 fits precision weigh scales where 16-bit resolution, ±2 LSB INL, and low noise are essential to measure minute force variations from load-cell bridges. The ±2.5 V differential input range directly accepts bridge excitation return signals, eliminating external instrumentation amplifiers and reducing BOM cost. The 250 ksps throughput supports real-time scale settling algorithms and motion-detection routines. The MSOP-16 footprint is small enough to fit inside compact retail, laboratory, and medical weighing instruments. The SAR architecture's 0-cycle latency simplifies the scale's settling and tare routines compared with oversampling delta-sigma converters. The –40°C to +85°C industrial temperature range covers both laboratory and industrial weigh platforms without requiring an extended-grade part.
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Multiplexed Multi-Channel Data Acquisition Systems
The LTC2381IMS-16 supports multiplexed multi-channel DAQ where one ADC services several analog inputs through an external analog mux. The 250 ksps throughput per channel is sufficient for many industrial telemetry, HVAC, and building-automation applications. The 3.25 mW power keeps total system power low even when multiple LTC2381IMS-16 chips operate in parallel. The MSOP-16 footprint enables high channel density per PCB card. The daisy-chain SPI mode allows multiple ADC chips to share one serial bus, reducing FPGA or MCU pin count and simplifying board routing. Compared with integrated multi-channel ADCs, a discrete SAR + mux architecture offers flexible channel count scaling and per-channel input range customization. The 16-bit linearity preserves measurement integrity across all channels.
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추천 제품 요약
엔지니어링 참조 데이터: LTC2381IMS-16 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | LTC2381IMS-16#TRPBF | LTC2381CIMS-16#PBF | LTC2381CMS-16#PBF | LTC2381IMS-16 | LTC2355IMSE-12 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | MSOP-16 | MSOP-16 - same | MSOP-16 - same | MSOP-16 - same | MSOP-16 - same | MSOP-12 - different |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 12 bit |
| Sampling Rate | 250 ksps | 250 ksps | 250 ksps | 250 ksps | 250 ksps | 200 ksps |
| Operating Temperature | -40°C to +85°C (I-grade) | -40°C to +85°C | 0°C to +70°C | 0°C to +70°C | -40°C to +85°C | -40°C to +85°C |
주요 차별점
- Industrial I-grade temperature range (vs LTC2381CIMS-16#PBF)
- Production-ready tape-and-reel packaging (vs LTC2381IMS-16#PBF (tube))
- MSOP-16 footprint vs MSOP-12 lower-resolution parts (vs LTC2355IMSE-12)
- Lower power vs higher-throughput SAR ADCs (vs LTC2335ILX-16)
설계 노트
The LTC2381IMS-16 requires a clean 2.5V analog supply on VDD and a separate digital I/O supply on OVDD (1.8V/2.5V/3.3V/5V). Place a 10µF tantalum and 0.1µF ceramic bypass capacitor as close as possible to VDD to filter low-frequency and high-frequency noise. Estimated: at 3.25 mW power consumption and 2.5V supply, the DC supply current is roughly 1.3 mA — choose an LDO or ferrite-filtered rail to minimize noise injection into the ADC reference. Keep digital returns separated from analog returns and join at a single star ground under the ADC exposed pad.
Use a ground plane on the layer directly beneath the LTC2381IMS-16 MSOP-16 footprint, with the exposed pad soldered to the ground plane to provide both thermal dissipation and a low-impedance analog ground return. Route differential IN+/IN- traces as a tightly-coupled pair (matched length within 0.5mm, differential impedance 100Ω) to preserve common-mode rejection at the analog input. Keep digital SPI traces (SCK, SDO, SDI, CNV, BUSY) routed on the opposite side of the PCB from the analog input traces to minimize digital-to-analog coupling. Place the REF decoupling capacitor (typically 10µF X7R) as close to the REF pin as possible to filter reference noise.
Drive the differential analog inputs with a low-noise, low-distortion driver capable of settling to 16-bit accuracy within the 4 µs acquisition window. A unity-gain difference amplifier such as the LT1991ACMS with adequate bandwidth (>10 MHz) and low output impedance is recommended for low-frequency industrial signals. Avoid using long input traces or unshielded cables without proper driver buffering — capacitive loading degrades the charge-redistribution DAC settling and increases conversion error. Add a small RC anti-alias filter (typically 100Ω + 1nF, fc ≈ 1.6 MHz) at the IN+/IN- pins if broadband noise is a concern, but verify settling against the datasheet acquisition timing.
Do not operate the LTC2381IMS-16 without an external reference bypass capacitor on the REF pin — the internal reference requires 10µF X7R minimum for stability. Do not leave any analog input floating; floating inputs cause INL degradation and excess noise. When using daisy-chain mode, ensure the SDO-to-SDI chain is properly terminated and that all CNV signals are synchronized to avoid inter-channel timing skew. Avoid switching the digital I/O supply OVDD while VDD is active — this violates power-sequencing requirements and may damage the part. Use the BUSY output to detect end-of-conversion rather than fixed delay, since this guarantees deterministic timing across temperature and supply variations.
규정 준수 정보
RoHS compliance indicated by #PBF suffix per Analog Devices ordering information. AEC-Q100 not applicable (industrial/commercial grade ADC). Lead-free finish confirmed by #PBF suffix.
