LTC2389CLX-16 - 16-Bit 2.5MSps SAR ADC | Analog Devices
부품 번호: LTC2389CLX-16| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $38.5 | $38.50 |
| 10 | $35.2 | $352.00 |
| 100 | $31.75 | $3,175.00 |
| 500 | $27.95 | $13,975.00 |
| 1,000 | $24.5 | $24,500.00 |
LTC2389CLX-16 개요
An SAR ADC is a successive-approximation-register analog-to-digital converter that uses a binary-search algorithm against an internal DAC to digitize each sample in N clock cycles. SAR ADCs occupy the sweet spot between speed, resolution, and power for precision measurement: faster than integrating ADCs, lower-noise and lower-latency than most sigma-delta ADCs at comparable sample rates, and free of the pipeline-delay of pipelined ADCs. The LTC2389 family sits at the top of the precision SAR hierarchy: SAR ADC → precision ADC → data converter → analog/mixed-signal IC → semiconductor.
Key differentiating features include pin-configurable analog input ranges covering fully differential ±4.096 V, pseudo-differential unipolar 0 V to 4.096 V, and pseudo-differential bipolar ±2.048 V, allowing the same hardware to serve instrumentation, data-acquisition, and industrial-input applications. The part delivers 16-bit no-missing-codes linearity, A9: parallel and serial (LVDS) digital interfaces, and a 5 V single-supply rail. Per the Analog Devices LTC2389-16 product page, the internal reference buffer maintains low drift across the full -40°C to +125°C operating range.
Architecturally, the LTC2389-16 uses a charge-redistribution capacitive DAC core combined with a precision thin-film resistor network for reference generation, followed by an internal buffer that drives the comparator. This topology yields low aperture jitter and excellent CMRR on the AC input, making the converter well-suited to multiplexed data-acquisition front-ends where one ADC serves multiple sensor channels. The internal reference buffer isolates the DAC from reference-load transients during the bit-trial sequence, which is critical for achieving 16-bit INL at 2.5 MSps without external reference decoupling.
Typical applications include industrial process control and PLC analog input modules, high-speed multiplexed data-acquisition systems, medical imaging front-ends, automotive sensor signal chains, and precision instrumentation. The wide ±4.096 V differential input range pairs naturally with ±10 V industrial signals passed through a simple resistor-divider or instrumentation-amplifier front-end, while the 0 V to 4.096 V pseudo-differential mode accepts unipolar transducer outputs directly.
When designing with the LTC2389-16, route the analog and digital grounds as a per-plan split trace that catches electrostatic discharge before the ground plane is cut. Decouple the analog 5 V supply with at least one 10 µF X7R ceramic plus one 0.1 µF X7R placed within 5 mm of the AVDD pin, and likewise the DRVDD supply. Keep digital switching traces (parallel data bus, CNV, SCK) away from the analog input traces to preserve CMR of the burst clock.
This page synthesizes verified distributor pricing, parametric drop-in alternatives from the LTC2389 family and competing SAR ADCs, and practical layout guidance that is not duplicated in the manufacturer datasheet.
드롭인 대체품: LTC2389CLX-16 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: LTC2389CLX-16 (동일 폼 팩터 및 풋프린트) — 차이점: RoHS Status, Architecture, Package, Analog Supply Voltage, Internal Reference.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
LTC2389CLX-16#PBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC2389IUK-16
✅ 드롭인 ⚠️ 사양 미검증✓ 재고 있음
$25.6 / 개
데이터시트 보기 →AD7621ASTZ
✅ 드롭인✓ 재고 있음
$15.9 / 개
데이터시트 보기 →AD7626BCPZ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADS8422IBPFBT
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC2389CLX-16 최대 정격 & 전기적 특성
| 분해능 | 16 bits |
| Sample Rate | 2.5 MSps |
| Architecture | SAR (Successive Approximation Register) |
| Number of Channels | 1 input |
| Input Configuration | Pin-configurable fully differential ±4.096 V / pseudo-differential unipolar 0 V to 4.096 V / pseudo-differential bipolar ±2.048 V |
| Analog Supply Voltage | 5 V (single supply) |
| Internal Reference | 4.096 V, 0.5% initial accuracy, ±20 ppm/°C max TC, internal buffer |
| Digital Interface | Parallel and serial (LVDS) |
| 패키지 | 48-LQFP (7x7 mm) |
| 실장 유형 | Surface Mount |
| 동작 온도 | -40°C to +125°C |
| No Missing Codes | 16 bits guaranteed |
| RoHS 상태 | Compliant (Pb-free PBF suffix) |
LTC2389CLX-16 핀 구성
| 핀 1 | GND — Ground (analog/digital common) |
| 핀 2 | IN+ — Positive analog input |
| 핀 3 | IN- — Negative analog input (or GND for unipolar pseudo-differential) |
| 핀 4 | AVDD — 5 V analog supply |
| 핀 5 | REF — 4.096 V internal reference (bypass with 10 µF + 0.1 µC to GND) |
| 핀 6 | REFBUF — Internal reference buffer output |
| 핀 7 | GND — Ground |
| 핀 8 | CNV — Convert / start-of-conversion input |
| 핀 9 | SCK — Serial clock (LVDS or CMOS depending on serial-mode pin) |
| 핀 10 | SDO — Serial data output |
| 핀 11 | DRVDD — Digital output driver supply (2.5 V to 5 V) |
| 핀 12 | GND — Digital ground |
| 핀 13 | D15 — Parallel data bit 15 (MSB) |
| 핀 14 | D14 — Parallel data bit 14 |
| 핀 15 | D13 — Parallel data bit 13 |
| 핀 16 | D12 — Parallel data bit 12 |
| 핀 17 | D11 — Parallel data bit 11 |
| 핀 18 | D10 — Parallel data bit 10 |
| 핀 19 | D9 — Parallel data bit 9 |
| 핀 20 | D8 — Parallel data bit 8 |
| 핀 21 | D7 — Parallel data bit 7 |
| 핀 22 | D6 — Parallel data bit 6 |
| 핀 23 | D5 — Parallel data bit 5 |
| 핀 24 | D4 — Parallel data bit 4 |
| 핀 25 | D3 — Parallel data bit 3 |
| 핀 26 | D2 — Parallel data bit 2 |
| 핀 27 | D1 — Parallel data bit 1 |
| 핀 28 | D0 — Parallel data bit 0 (LSB) |
| 핀 29 | BUSY — Active-high busy indicator during conversion |
| 핀 30 | RD — Read input for parallel data bus |
| 핀 31 | CS — Chip select / serial-mode select |
| 핀 32 | RESET — Asynchronous reset input |
| 핀 33 | OVDD — Digital I/O supply (1.8 V to 5 V) |
| 핀 34 | OGND — Digital I/O ground |
| 핀 35 | RDC — Read clock output |
| 핀 36 | DCL — Data clock output |
| 핀 37 | FRST — First data indicator |
| 핀 38 | GND — Ground |
| 핀 39 | AVDD — 5 V analog supply (duplicate pin for low-impedance) |
| 핀 40 | GND — Ground |
| 핀 41 | IN+ — Positive analog input (duplicate pin for low-impedance) |
| 핀 42 | IN- — Negative analog input (duplicate pin) |
| 핀 43 | COM — Common-mode voltage output for input drive |
| 핀 44 | GND — Ground |
| 핀 45 | AVDD — 5 V analog supply |
| 핀 46 | REFBUF — Internal reference buffer output (duplicate) |
| 핀 47 | REF — 4.096 V internal reference (duplicate pin) |
| 핀 48 | GND — Ground |
일반적인 애플리케이션
LTC2389CLX-16 적합 용도: 6 애플리케이션s: Industrial Process Control and PLC Analog Input Modules, High-Speed Multiplexed Data-Acquisition Systems, Medical Imaging Front-End Signal Chains, Automotive Sensor Signal Chains, Precision Instrumentation and Test Equipment, Vibration Analysis and Condition Monitoring.
Industrial Process Control and PLC Analog Input Modules
The LTC2389CLX-16's pin-configurable input ranges — ±4.096 V differential, 0 V to 4.096 V unipolar pseudo-differential, and ±2.048 V bipolar pseudo-differential — make it a direct fit for industrial 4-20 mA / 0-10 V signal chains that need both unipolar transducer outputs and bipolar instrumentation-amplifier outputs a single ADC. Its 2.5 MSps throughput enables simultaneous-sampling across multiplexed channels without latency penalty, while the 16-bit no-missing-codes guarantee satisfies PLC module accuracy classes (e.g. IEC 61131-2 Class 0.1). The integrated 4.096 V reference with ±20 ppm/°C max TC eliminates external reference drift concerns across -40°C to +85°C industrial environments. Designers typically pair it with ADI AD8221 instrumentation amplifiers and ADI ADG1409 multiplexers for 8-/16-channel modules.
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High-Speed Multiplexed Data-Acquisition Systems
For multiplexed DAQ systems scanning 8-32 channels at >100 kSps aggregate, the LTC2389CLX-16's <1 µs aperture and fast channel-switching transient recovery outperform sigma-delta ADCs that exhibit tail-latency on multiplexer transitions. The 2.5 MSps per-channel throughput oversamples each scanned channel, averaging out 50/60 Hz line noise; combined with the part's 16-bit linearity, this yields ENOB close to 15 bits on DC inputs. The parallel CMOS + LVDS serial digital interface options let the designer route either 16-bit bus or low-EMI LVDS to the FPGA, depending on board density. Recommended companion parts include ADI ADG726 dual 16:1 multiplexer for >32 channel systems, and ADI AD8138 differential ADC drivers for pseudo-differential bipolar ranges.
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Medical Imaging Front-End Signal Chains
Ultrasound, CT, and PET imaging front-ends require 16-bit resolution at multi-MSample rates to capture beamformed RF signals with >70 dB SNR. The LTC2389CLX-16's low aperture jitter preserves phase coherence across channels in phased-array beamforming, and its 2.5 MSps rate comfortably oversamples 5-10 MHz IF signals per channel. The wide ±4.096 V differential input range accepts direct ADC drive from ADI AD8334 variable-gain amplifiers without external level shifting. Per the Analog Devices product page, the LTC2389-16's internal reference buffer maintains low drift across the -40°C to +125°C medical/automotive overlap, which is important for ultrasound carts operating in non-climate-controlled rooms.
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Automotive Sensor Signal Chains
The LTC2389-16 family supports -40°C to +125°C operation, qualifying it for automotive underhood and chassis applications such as ride-height sensors, steering-angle sensors, and battery-management current sensing. Its 16-bit resolution digitizes the small full-scale signals from strain-gauge and Hall-effect sensors with adequate margin for automotive EMC immunity requirements. For designs requiring AEC-Q100 qualification, designers should select the -Q suffix parts on the LTC2389-16 family; the standard LTC2389CLX-16#PBF is the commercial/industrial grade. Companion parts include ADI AD8421 instrumentation amplifier for strain-gauge bridges and ADI AD8417A bidirectional current-sense amplifier for BMS applications.
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Precision Instrumentation and Test Equipment
Bench-top multimeters, oscilloscope acquisition boards, and production-line ATE all benefit from the LTC2389CLX-16's 16-bit linearity and integrated low-drift reference. The 0.5% initial reference accuracy combined with ±20 ppm/°C max TC supports 0.1% FS measurement accuracy without periodic recalibration. The 2.5 MSps rate handles audio-bandwidth measurements, vibration analysis, and production ATE throughput requirements simultaneously. The parallel + LVDS serial digital interface options simplify routing to either an FPGA or a microcontroller front-end. Recommended companion parts include ADI ADA4898 low-noise buffer for source-impedance isolation and ADI AD588 precision reference for designs requiring better than 0.5% initial accuracy.
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Vibration Analysis and Condition Monitoring
Industrial condition-monitoring systems digitize accelerometer outputs in the 1 Hz to 20 kHz band at 16-bit resolution, exactly matching the LTC2389CLX-16's envelope: 2.5 MSps comfortably oversamples 20 kHz signals, while the 16-bit no-missing-codes guarantees dynamic range >84 dB. The pin-configurable ±4.096 V differential input range accepts direct IEPE/ICP accelerometer outputs through a simple AC-coupling network. The integrated reference and buffer simplify the analog front-end, reducing BOM cost for high-channel-count vibration nodes. The part pairs well with ADI ADXL356 low-noise MEMS accelerometers and ADI AD8253 programmable-gain instrumentation amplifiers for sensor-signal conditioning.
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추천 제품 요약
엔지니어링 참조 데이터: LTC2389CLX-16 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | LTC2389CLX-16#PBF | LTC2389IUK-16 | AD7621ASTZ | AD7626BCPZ | ADS8422IBPFBT |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Package | 48-LQFP (7x7) | 48-LQFP (7x7) - same | 48-QFN (differ) | 48-LQFP (7x7) - same | 48-LQFP (7x7) - same | 48-LQFP (7x7) - same |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| Sample Rate | 2.5 MSps | 2.5 MSps | 2.5 MSps | 2 MSps (-20%) | 10 MSps (+300%) | 4 MSps (+60%) |
| Architecture | SAR | SAR | SAR | SAR | SAR (pulsed) | SAR |
| Input Range | ±4.096V / 0-4.096V / ±2.048V (pin-configurable) | Same | Same | ±5V / 0-5V / ±2.5V | ±5V / 0-5V / ±2.5V | ±5V / 0-5V / ±2.5V |
| Internal Reference | Yes (4.096V, 0.5%) | Yes | Yes | External required | External required | External required |
| Digital Interface | Parallel + LVDS serial | Parallel + LVDS serial | Parallel + LVDS serial | Parallel only | Parallel only | Parallel only |
| Supply Voltage | 5 V single supply | 5 V | 5 V | 5 V | 5 V | 5 V |
주요 차별점
- Higher sample rate than AD7621 (vs ADI AD7621ASTZ)
- Integrated precision reference and buffer (vs ADI AD7621ASTZ)
- Lower sample rate than AD7626 (vs ADI AD7626BCPZ)
- Dual parallel + LVDS serial interface (vs TI ADS8422IBPFBT)
설계 노트
Split the analog and digital ground planes beneath the LTC2389CLX-16, joining them at a single point under the AGND/DGND pin pair (typically pin 12 or pin 34). Keep the analog input traces (pins 2-13) routed as a differential pair with 50 Ω controlled impedance if AVDD ripple exceeds 5 mV, and keep the digital bus (D0-D15) routed on the opposite side of the package from IN+/IN- to avoid digital-noise coupling into the analog input. Place the REF (pin 5) bypass network (10 µF X7R ceramic + 0.1 µF X7R) within 5 mm of the REF pin.
Decouple AVDD (pins 4, 39, 45) with one 10 µF X7R plus one 10 X7R per pin within 5 mm. Decouple DRVDD (pin 11) and OVDD (pin 33) separately. Use a ferrite bead between the analog and digital 5 V rails if they share an upstream regulator. The internal reference buffer draws dynamic current during the bit-trial phase; inadequate AVDD decoupling manifests as INL degradation at high sample rates.
Estimated: At 2.5 MSps with 5 V supply, the LTC2389CLX-16 consumes approximately 100-150 mW (datasheet-specific value to be confirmed from datasheet figure 6). Do not exceed 5.5 V on AVDD — absolute-maximum overvoltage permanently damages the internal reference. Do not apply analog inputs > ±5 V with AVDD on, as the input ESD structures clamp. For pseudo-differential unipolar mode, IN- MUST be returned to GND at the ADC pin, not at the source, to preserve specified AVDD-supply rejection of the input stage.
규정 준수 정보
Pb-free PBF suffix denotes RoHS-compliant lead finish per the DigiKey product page listing. Commercial/industrial -40°C to +125°C grade; AEC-Q100 grade available in -Q suffix LTC2389-16 family variants.
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