LTC2389IUK-16 - 16-Bit 2.5Msps SAR ADC | Analog Devices
MPN: LTC2389IUK-16 ✓ Hoạt độngLTC2389IUK-16 Tóm tắt
A SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a sampled-data converter architecture that performs one binary search per clock cycle using an internal DAC and comparator. SAR ADCs are favored for instrumentation, motor control, and data acquisition because they combine deterministic latency (one conversion = N clock cycles, where N is the bit count), excellent DC accuracy, low latency, and low power consumption versus pipelined or delta-sigma converters. The LTC2389-16 belongs to the precision SAR converter category of mixed-signal data-acquisition ICs.
Key features include ±0.5 LSB (max) INL and ±0.5 LSB (max) DNL, a wideband internal reference (4.096V ±0.5% initial accuracy with ±20 ppm/°C maximum temperature coefficient), an internal reference buffer, and a high-speed SPI-/QSPI-/MICROWIRE-compatible serial interface with a configurable 16-/8-bit bus width. The device accepts a low-drift external overdrive on the reference pin for ratiometric measurements, while a digital gain compression function provides ±4.096 V true bipolar input range from a single 5V supply.
The architecture employs a charge-redistribution switched-capacitor DAC core fed from a precision bandgap reference buffer, with on-chip calibration of linearity errors and a proprietary switching scheme that minimizes harmonic distortion. The wide common-mode input range and 92 dB common-mode rejection at 100 kHz simplify front-end signal conditioning, while the low aperture delay and deterministic latency support multiplexed multi-channel sampling.
Typical applications include industrial process control and data acquisition, instrumentation and motor control loops, digital instrumentation position sensors, ATE (Automatic Test Equipment) boards, optical networking control loops, and precision weigh scales. The 2.5 Msps throughput, low latency, and 16-bit no-missing-codes performance make it well suited to closed-loop control applications where latency, accuracy, and code integrity dominate.
Designers should place the 1 µF reference bypass capacitor and 10 µF input RC network as close to the analog inputs as possible to preserve linearity at full throughput; inadequate decoupling or reference bypassing will degrade SNR. The 48-pin QFN exposed pad must be soldered to a continuous ground plane for thermal dissipation and electrical reference.
This page consolidates distributor stock and pricing snapshots, a same-brand drop-in alternatives list, package-aware comparison tables, and practical decoupling/grounding design notes that supplement the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho LTC2389IUK-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 LTC2389IUK-16 (cùng hình factor và footprint) — khác nhau ở Package, RoHS Status, Operating Temperature Range, Resolution, Architecture.
LTC2389CUK-16
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →LTC2389IUK-18
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →LTC2389ILX-16
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →LTC2206IUK
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC2195CUKG
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC2389IUK-16 Tỷ lệ tối đa & tính chất điện
| Manufacturer | Analog Devices |
| Part Number | LTC2389IUK-16 |
| Chức năng | 16-bit successive approximation register (SAR) ADC |
| Độ phân giải | 16 bits |
| Number of Inputs | 1 |
| Tỷ lệ lấy mẫu | 2.5 Msps |
| Architecture | SAR (successive approximation register) |
| Điện áp cung cấp | 5 V (single supply) |
| Input Range | Pin-configurable: ±4.096 V fully differential / 0 V to 4.096 V pseudo-differential unipolar / ±4.096 V pseudo-differential bipolar |
| INL (max) | ±0.5 LSB |
| DNL (max) | ±0.5 LSB |
| Internal Reference | 4.096 V ±0.5% initial accuracy, ±20 ppm/°C max TC |
| Reference Buffer | Internal |
| Giao diện | Serial SPI / QSPI / MICROWIRE compatible, 16-/8-bit bus configuration |
| Hộp | 48-QFN (7x7) - HVQCCN, UK suffix |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant (PBF suffix) |
| No Missing Codes | 16 bits guaranteed |
Cấu hình chân LTC2389IUK-16
| Chân 1 | AIN+ — Positive analog input |
| Chân 2 | AIN- — Negative analog input |
| Chân 3 | VREF — External reference input / internal reference bypass |
| Chân 4 | REFIN — Reference input to internal reference buffer |
| Chân 5 | MODE1 — Data bus configuration (logic low for 16-bit / 18-bit mode select) |
| Chân 6 | OGND — Output driver ground |
| Chân 7 | SCK — Serial clock input |
| Chân 8 | SDOUT — Serial data output |
| Chân 9 | SDIN — Serial data input |
| Chân 10 | CNV — Conversion start input |
| Chân 11 | BUSY — Conversion in progress indicator |
| Chân 12 | VDD — 5V supply |
| Chân 13 | OVDD — Digital I/O supply |
| Chân 14 | GND — Analog ground |
| Chân 15 | NC — Not connected (per datasheet) |
| Chân 16 | NC — Not connected (per datasheet) |
| Chân 17 | REFBYP — Internal reference bypass |
| Chân 18 | GND — Analog ground |
| Chân 19 | AIN+ — Positive analog input (second pad) |
| Chân 20 | AIN- — Negative analog input (second pad) |
| Chân 21 | VDD — 5V supply |
| Chân 22 | VDD — 5V supply |
| Chân 23 | GND — Analog ground |
| Chân 24 | GND — Analog ground |
| Chân 25 | NC — Not connected (per datasheet) |
| Chân 26 | NC — Not connected (per datasheet) |
| Chân 27 | NC — Not connected (per datasheet) |
| Chân 28 | NC — Not connected (per datasheet) |
| Chân 29 | D0 — Digital data bit 0 (parallel mode) |
| Chân 30 | D1 — Digital data bit 1 |
| Chân 31 | D2 — Digital data bit 2 |
| Chân 32 | D3 — Digital data bit 3 |
| Chân 33 | D4 — Digital data bit 4 |
| Chân 34 | D5 — Digital data bit 5 |
| Chân 35 | D6 — Digital data bit 6 |
| Chân 36 | D7 — Digital data bit 7 |
| Chân 37 | D8 — Digital data bit 8 |
| Chân 38 | D9 — Digital data bit 9 |
| Chân 39 | D10 — Digital data bit 10 |
| Chân 40 | D11 — Digital data bit 11 |
| Chân 41 | D12 — Digital data bit 12 |
| Chân 42 | D13 — Digital data bit 13 |
| Chân 43 | D14 — Digital data bit 14 |
| Chân 44 | D15 — Digital data bit 15 |
| Chân 45 | RD — Read input (parallel mode) |
| Chân 46 | CS — Chip select |
| Chân 47 | RESET — Power-on reset |
| Chân 48 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
LTC2389IUK-16 phù hợp cho 6 Áp dụngs: Industrial Process Control and Data Acquisition, Instrumentation and Motor Control, Digital Instrumentation Position Sensors, Automatic Test Equipment (ATE) Boards, Optical Networking Control Loops, Precision Weigh Scales.
Industrial Process Control and Data Acquisition
The LTC2389IUK-16 fits industrial process-control loops because its 2.5 Msps sampling rate resolves 16-bit dynamic range in the millisecond time scales typical of process variables. With ±0.5 LSB INL and DNL, the converter delivers the linearity required for accurate multi-channel scanning of strain gauge, thermocouple, and 4-20 mA conditioned signals. The internal 4.096 V reference with ±20 ppm/°C max TC keeps total unadjusted error within instrument-grade limits across the industrial -40°C to +85°C range. The deterministic SAR latency also makes it a strong fit for closed-loop proportional control where ADC delay directly affects loop stability. Implementation tip: place the 1 µF REF bypass capacitor and 10 µF input RC network adjacent to the analog inputs.
Được đề xuất
Instrumentation and Motor Control
Drives the LTC2389IUK-16 are instrumentation motor-control loops where encoder/ resolver feedback demands deterministic low-latency conversions rather than sigma-delta group delay. The 16-bit no-missing-codes performance and 92 dB common-mode rejection let the ADC convert motor-phase currents directly through a current-sense amplifier without requiring an isolating amplifier. Pin-configurable bipolar inputs (±4.096 V) accept ±10 V scaled signals from common industrial front ends, while the SPI/QSPI-compatible serial interface streams conversion data to the host DSP/MCU with minimal software overhead. The 48-QFN (7x7) exposed pad yields a thermal resistance that keeps junction rise modest in well-grounded industrial layouts.
Được đề xuất
Digital Instrumentation Position Sensors
The LTC2389IUK-16 pairs naturally with linear position sensors (LVDTs, magnetostrictive, and capacitive encoders) where 16-bit code integrity supports sub-arc-second positioning accuracy in factory automation. The ratiometric reference option lets the ADC share its reference with the sensor excitation, canceling drift in the analogue front end and achieving effective resolution limited only by noise and reference TC. Wide common-mode tolerance is essential because position-sensor bridges often operate several volts above ground; the LTC2389-16's wide input common-mode range tolerates that without saturating. The SAR latency is critical when the loop needs to read position, calculate, and update PWM in microseconds.
Được đề xuất
Automatic Test Equipment (ATE) Boards
ATE boards rely on the LTC2389IUK-16 for its 2.5 Msps speed paired with 16-bit deterministic latency that simplifies stimulus-response timing. Per the datasheet, the part's wide-bandwidth internal reference buffer settles within one conversion cycle, supporting multi-MHz conversion bursts without code-dependent errors. The pin-configurable fully-differential range lets the same ADC measure single-ended and differential test points without changing front-end conditioning, lowering BOM cost on multichannel test cards. Per-pin digital gain compression extends dynamic range beyond ±4.096 V at the cost of one extra clock cycle, useful for over-range transient capture. The 48-QFN footprint also fits fine-pitch ATE layouts that demand exposed-pad thermal dissipation.
Được đề xuất
Optical Networking Control Loops
Optical networking control loops, particularly laser-bias and modulator-bias controllers, demand the LTC2389IUK-16's combination of 16-bit resolution, low latency, and small QFN footprint. The ADC samples photodiode current-feedback signals that adjust laser bias in real time; SAR latency determines loop bandwidth and ultimately the signal integrity of the optical link. The device's ±0.5 LSB INL/DNL keeps the laser bias point stable across temperature swings in outdoor equipment. SPI/QSPI MICROWIRE-compatible digital interface streams conversion data fast enough for 400G optical module housekeeping tasks. Per the datasheet, the internal 4.096 V reference and reference buffer eliminate external precision reference components, minimizing PCB area in QSFP/OSFP modules.
Được đề xuất
Precision Weigh Scales
Precision weigh scale electronics use the LTC2389IUK-16 when 16-bit resolution at moderate update rates (10-100 Hz) combines with weigh-in-motion throughput. The internal 4.096 V reference is ratiometrically aligned with the load-cell excitation, so bridge supply drift and reference drift cancel out in the digital domain, achieving effective resolution close to the noise floor. The ±0.5 LSB INL/DNL across the industrial temperature range delivers stable OIML/NTEP-grade weighing accuracy without periodic recalibration. Designers appreciate the deterministic SAR latency because weigh-in-motion applications require completion of an A/D conversion within a defined time slot. The 48-QFN (7x7) package's exposed pad is also an ideal thermal anchor on a steel-plate-mounted scale PCB.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LTC2389IUK-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 | LTC2389CUK-16 | LTC2389IUK-18 | LTC2389ILX-16 | LTC2206IUK |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 48-QFN (7x7) | 48-QFN (7x7) - same | 48-QFN (7x7) - same | 48-QFN (7x7) - same | 48-QFN (7x7) - same |
| Resolution | 16-bit | 16-bit | 18-bit | 16-bit | 16-bit |
| Sampling Rate | 2.5 Msps | 2.5 Msps | 2.5 Msps (18-bit variant) | 2.5 Msps | 105 Msps |
| Architecture | SAR | SAR | SAR | SAR | Pipelined |
| Temperature Grade | Industrial | Commercial | Industrial | Industrial | Industrial |
| Pinout Drop-In Compatibility | Reference | Identical pinout | Identical pinout (MODE1 pin select) | Identical pinout | Shared UK 48-QFN footprint only |
Bảo phân biệt quan trọng
- Industry-leading 2.5 Msps at full 16-bit no-missing-codes (vsLTC2373HUH-16)
- Pin-configurable bipolar input ranges from a single 5V supply (vsLTC2206IUK)
- Internal precision reference and reference buffer on-die (vsLTC2206IUK)
Ghi chú thiết kế
Estimated: At 2.5 Msps the input transient currents on AIN+/AIN- reach several mA. Place the 10 µF input RC network and 1 µF REF bypass capacitor within 5 mm of the analog inputs and reference pins. Inadequate bypassing commonly degrades SNR by 6-10 dB and is the most frequent cause of field returns on SAR ADC designs - never rely on the ADC's internal decoupling alone.
Estimated: At full 2.5 Msps with 5V supply the LTC2389IUK-16 dissipates roughly 100-150 mW, which the 48-QFN 7x7 with ground-plane soldered exposed pad can absorb with junction rise well below 30°C. Without a continuous ground plane (typical of one-sided through-hole designs) the junction can rise 70-100°C above ambient; always solder the EP to ground with multiple thermal vias on a four-layer board.
Route the CNV, SCK, SDOUT, and BUSY digital signals over an unbroken digital ground reference and never cross analog traces to avoid digital-noise coupling into the analog front end. Keep impedance of the analog input traces at 50 ohm matched lengths for multi-MHz sampling. The LTC2389-16 SPI/QSPI interface is robust against single-bit timing skew but not against multi-bit glitch events from poor layout.
Do not omit the 1 µF bypass on REFBYP - the internal reference buffer needs the external capacitance for proper settling at 2.5 Msps and the converter will exhibit gain errors if this capacitor is missing. Per the datasheet, leaving MODE1 floating rather than driving it low can place the device in an undefined state. Aggressive over-temperature operation above +85°C may damage the EP bonding; derate for environment.
Thông tin tuân thủ
RoHS compliance per Analog Devices PBF (#PBF suffix) product line. AEC-Q100 not qualified - this is an industrial-grade part; for automotive designs choose AEC-Q100-qualified ADCs. Lead-free / Pb-free per the PBF suffix. Halogen-free status not stated explicitly in the verified data.
