LTC2389CLX-16 - 16-Bit 2.5MSps SAR ADC | Analog Devices
MPN: LTC2389CLX-16LTC2389CLX-16 Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho LTC2389CLX-16 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với LTC2389CLX-16 (cùng hình factor và footprint) — khác nhau ở RoHS Status, Architecture, Package, Analog Supply Voltage, Internal Reference.
LTC2389CLX-16#PBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC2389IUK-16
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →AD7621ASTZ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AD7626BCPZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8422IBPFBT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC2389CLX-16 Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 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) |
| Hộp | 48-LQFP (7x7 mm) |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | -40°C to +125°C |
| No Missing Codes | 16 bits guaranteed |
| Trạng thái RoHS | Compliant (Pb-free PBF suffix) |
Cấu hình chân LTC2389CLX-16
| Chân 1 | GND — Ground (analog/digital common) |
| Chân 2 | IN+ — Positive analog input |
| Chân 3 | IN- — Negative analog input (or GND for unipolar pseudo-differential) |
| Chân 4 | AVDD — 5 V analog supply |
| Chân 5 | REF — 4.096 V internal reference (bypass with 10 µF + 0.1 µC to GND) |
| Chân 6 | REFBUF — Internal reference buffer output |
| Chân 7 | GND — Ground |
| Chân 8 | CNV — Convert / start-of-conversion input |
| Chân 9 | SCK — Serial clock (LVDS or CMOS depending on serial-mode pin) |
| Chân 10 | SDO — Serial data output |
| Chân 11 | DRVDD — Digital output driver supply (2.5 V to 5 V) |
| Chân 12 | GND — Digital ground |
| Chân 13 | D15 — Parallel data bit 15 (MSB) |
| Chân 14 | D14 — Parallel data bit 14 |
| Chân 15 | D13 — Parallel data bit 13 |
| Chân 16 | D12 — Parallel data bit 12 |
| Chân 17 | D11 — Parallel data bit 11 |
| Chân 18 | D10 — Parallel data bit 10 |
| Chân 19 | D9 — Parallel data bit 9 |
| Chân 20 | D8 — Parallel data bit 8 |
| Chân 21 | D7 — Parallel data bit 7 |
| Chân 22 | D6 — Parallel data bit 6 |
| Chân 23 | D5 — Parallel data bit 5 |
| Chân 24 | D4 — Parallel data bit 4 |
| Chân 25 | D3 — Parallel data bit 3 |
| Chân 26 | D2 — Parallel data bit 2 |
| Chân 27 | D1 — Parallel data bit 1 |
| Chân 28 | D0 — Parallel data bit 0 (LSB) |
| Chân 29 | BUSY — Active-high busy indicator during conversion |
| Chân 30 | RD — Read input for parallel data bus |
| Chân 31 | CS — Chip select / serial-mode select |
| Chân 32 | RESET — Asynchronous reset input |
| Chân 33 | OVDD — Digital I/O supply (1.8 V to 5 V) |
| Chân 34 | OGND — Digital I/O ground |
| Chân 35 | RDC — Read clock output |
| Chân 36 | DCL — Data clock output |
| Chân 37 | FRST — First data indicator |
| Chân 38 | GND — Ground |
| Chân 39 | AVDD — 5 V analog supply (duplicate pin for low-impedance) |
| Chân 40 | GND — Ground |
| Chân 41 | IN+ — Positive analog input (duplicate pin for low-impedance) |
| Chân 42 | IN- — Negative analog input (duplicate pin) |
| Chân 43 | COM — Common-mode voltage output for input drive |
| Chân 44 | GND — Ground |
| Chân 45 | AVDD — 5 V analog supply |
| Chân 46 | REFBUF — Internal reference buffer output (duplicate) |
| Chân 47 | REF — 4.096 V internal reference (duplicate pin) |
| Chân 48 | GND — Ground |
Ứng dụng tiêu biểu
LTC2389CLX-16 phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LTC2389CLX-16 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- Higher sample rate than AD7621 (vsADI AD7621ASTZ)
- Integrated precision reference and buffer (vsADI AD7621ASTZ)
- Lower sample rate than AD7626 (vsADI AD7626BCPZ)
- Dual parallel + LVDS serial interface (vsTI ADS8422IBPFBT)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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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