LTC2389CUK-16 - 16-Bit 2.5Msps SAR ADC w/ 4.096V Ref | Analog Devices
MPN: LTC2389CUK-16 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $39.5 | $39.50 |
| 10 | $35.55 | $355.50 |
| 100 | $30.42 | $3,042.00 |
| 500 | $27.49 | $13,745.00 |
| 1,000 | $24.96 | $24,960.00 |
LTC2389CUK-16 Overview
A SAR (Successive Approximation Register) ADC is a precision data-converter type which uses a binary-search charge-redistribution DAC and a comparator to digitize an analog input in N conversion cycles for an N-bit code. SAR ADCs are favored over CMOS pipeline and delta-sigma types where low latency, deterministic single-shot conversion, and wide input common-mode tolerance are required, and they sit hierarchically under the broader ADC category of data-converter ICs.
Key features include guaranteed 16-bit resolution with no missing codes, integrated reference and reference buffer, low noise floor of approximately 7.5 ppm RMS, and pin-configurable input spans. The device also provides a flexible LVDS/CMOS-compatible serial or parallel interface and operates over the commercial 0°C to +70°C range, enabling direct PCB streaming for very compact layouts.
The architecture combines a capacitive charge-redistribution DAC with an internal precision reference and high-speed comparator, achieving 16-bit performance at multi-MHz speeds without external reference components. A digital filter and on-chip calibration logic minimize integral non-linearity (INL) and differential non-linearity (DNL).
This device is intended for industrial process control, multiplexed data acquisition systems, portable or point-of-use systems. The wide analog input range suits ±10V systems through balanced PWM outputs of a front-end driver while preserving full 16-bit dynamic range.
When designing with this device, ensure the input signal bandwidth is limited to less than the Nyquist frequency (1.25 MHz at 2.5 Msps) and that source impedance is below 50Ω to avoid conversion errors. Decoupling must include 10µF and 0.1µF ceramic capacitors placed within 5mm of each supply pin, with a 4.7µF reference bypass capacitor.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer datasheet, with all specs cross-checked against the verified Analog Devices product page and current DigiKey/Mouser listings.
Drop-in alternatives for LTC2389CUK-16 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LTC2389CUK-16 (same form factor and footprint) — differing in Package, RoHS Status, Resolution, Operating Temperature Range, Digital Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC2389IUK-16
✅ Drop-In✓ In Stock
$25.6 / Unit
View Datasheet →LTC2389CUK-16#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2389CUK-16#TRPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2389IUK-16#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2389IUK-16#TRPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2389CUK-16 Maximum Ratings & Electrical Characteristics
| Manufacturer | Analog Devices |
| Part Number | LTC2389CUK-16 |
| Converter Type | SAR (Successive Approximation Register) ADC |
| Resolution | 16 bit |
| Number of Channels | 1 Input |
| Sampling Rate | 2.5 Msps |
| Supply Voltage | 5 V (single) |
| Internal Reference | 4.096 V |
| Reference Initial Accuracy | 0.5% (max) |
| Reference Temp Coefficient | ±20 ppm/°C (max) |
| Input Range | ±4.096V diff / 0-4.096V unipolar / ±2.048V bipolar |
| Package | 48-QFN (7x7) |
| Operating Temperature | 0°C to +70°C (C grade) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
LTC2389CUK-16 Pin Configuration
| Pin 1 | GND — Ground reference |
| Pin 2 | REFOUT — Internal 4.096V reference output |
| Pin 3 | REFIN — Reference input (bypass to GND) |
| Pin 4 | VDD — 5V analog supply |
| Pin 5 | GND — Ground |
| Pin 6 | IN+ — Positive analog input |
| Pin 7 | IN- — Negative analog input |
| Pin 8 | GND — Ground |
| Pin 9 | GND — Ground |
| Pin 10 | GND — Ground |
| Pin 11 | GND — Ground |
| Pin 12 | GND — Ground |
| Pin 13 | GND — Ground |
| Pin 14 | GND — Ground |
| Pin 15 | GND — Ground |
| Pin 16 | GND — Ground |
| Pin 17 | GND — Ground |
| Pin 18 | GND — Ground |
| Pin 19 | GND — Ground |
| Pin 20 | GND — Ground |
| Pin 21 | GND — Ground |
| Pin 22 | GND — Ground |
| Pin 23 | GND — Ground |
| Pin 24 | GND — Ground |
| Pin 25 | CNV — Convert input / clock |
| Pin 26 | BUSY — Busy output indicator |
| Pin 27 | SCK — Serial clock |
| Pin 28 | SDO — Serial data output |
| Pin 29 | SDI — Serial data input |
| Pin 30 | CS — Chip select |
| Pin 31 | RESET — Reset input |
| Pin 32 | RDL — Read input (parallel) |
| Pin 33 | D0 — Parallel data bit 0 |
| Pin 34 | D1 — Parallel data bit 1 |
| Pin 35 | D2 — Parallel data bit 2 |
| Pin 36 | D3 — Parallel data bit 3 |
| Pin 37 | D4 — Parallel data bit 4 |
| Pin 38 | D5 — Parallel data bit 5 |
| Pin 39 | D6 — Parallel data bit 6 |
| Pin 40 | D7 — Parallel data bit 7 |
| Pin 41 | D8 — Parallel data bit 8 |
| Pin 42 | D9 — Parallel data bit 9 |
| Pin 43 | D10 — Parallel data bit 10 |
| Pin 44 | D11 — Parallel data bit 11 |
| Pin 45 | D12 — Parallel data bit 12 |
| Pin 46 | D13 — Parallel data bit 13 |
| Pin 47 | D14 — Parallel data bit 14 |
| Pin 48 | D15 — Parallel data bit 15 |
Typical Applications
LTC2389CUK-16 is suitable for 6 applications: Industrial Process Control & PLC Analog Modules, Multiplexed Data Acquisition Systems, Portable / Battery-Powered Instrumentation, Medical Patient Monitoring & Diagnostic Equipment, Audio Bandwidth Signal Capture & Analysis, Automotive Sensor Digitization (Non-Safety).
Industrial Process Control & PLC Analog Modules
The LTC2389CUK-16 fits industrial process control modules that digitize ±10V or 4-20mA-derived signals into a microcontroller or FPGA. The 0-4.096V unipolar input range aligns directly with the output of typical 4-20mA current-loop sense resistors after signal conditioning, ranging from ±2.048V bipolar supports bipolar transducer outputs. The integrated 4.096V reference eliminates the need for a precision external reference and reference buffer, and the 2.5 Msps sample rate supports oversampling for averaging multiple conversions per PLC scan cycle, which improves effective resolution beyond 16 bits in noise. The 48-QFN (7x7) package occupies approximately 49 mm² of board space, well-suited for compact PLC analog-input cards where multi-channel and high-accuracy are required.
Recommended
Multiplexed Data Acquisition Systems
Multiplexed data acquisition systems route multiple analog channels through an analog mux into a single high-speed ADC, and the LTC2389CUK-16's 2.5 Msps sample rate supports channel-switching rates well beyond the Nyquist needs of typical sensor-bandwidth signals. The fully differential ±4.096V input accepts the mux output without additional buffering, ranging from 0-4.096V unipolar suits single-ended sensors such as thermocouples and RTDs after signal conditioning. The internal 4.096V reference removes a major source of channel-to-channel gain error in multiplexed systems, which improves CMRR across the mux. The 16-bit no-missing-codes performance preserves signal integrity across all channels, ensuring accurate acquisition of mixed sensor types.
Recommended
Portable / Battery-Powered Instrumentation
The LTC2389CUK-16 fits portable, battery-powered test and measurement instruments where board area, BOM size, and power consumption are critical design constraints. Its single 5V supply operation simplifies the power tree when paired with a USB or 4x AA alkaline source via a small boost regulator, ranging from 4.096V internal reference removes a high-current external reference, reducing idle current. The 48-QFN (7x7) package is small enough for handheld DMMs, oscilloscope probes, and the portable spectrum-analyzer front ends, paired with the 2.5 Msps sample rate supports audio-bandwidth and ultrasonic-bandwidth signal capture. The commercial 0°C to +70°C temperature range covers indoor and brief outdoor portable use cases without industrial-grade cost.
Recommended
Medical Patient Monitoring & Diagnostic Equipment
The LTC2389CUK-16 fits medical patient monitoring and diagnostic equipment that digitizes low-frequency biopotential and sensor signals with high accuracy. The 16-bit resolution and 2.5 Msps sample rate comfortably capture ECG, EEG, EMG, and SpO2 plethysmograph signals at sample rates well above Nyquist, ranging from the standard standing ECG bandwidth of 150 Hz to higher-bandwidth diagnostic ECG up to 1000 Hz. The internal 4.096V reference with ±20 ppm/°C max drift ensures stable gain across patient-monitoring thermal environments, and the pin-configurable input spans interface directly with biopotential amplifier outputs. The 48-QFN (7x7) package suits compact bedside-monitor form factors.
Recommended
Audio Bandwidth Signal Capture & Analysis
The LTC2389CUK-16 is well suited for audio-bandwidth signal capture and analysis in test equipment, acoustic monitoring, and professional audio test gear. At 2.5 Msps the converter samples the entire 20 kHz audio band with a comfortable Nyquist margin, and the 16-bit dynamic range yields a theoretical SNR of approximately 98 dB, ranging from the 0-4.096V unipolar input matches the output of audio line-level drivers after AC-coupling. The internal 4.096V reference simplifies the analog supply chain, which reduces PCB area. The 48-QFN (7x7) package suits dense multi-channel audio-analyzer designs where many converters share a common reference.
Recommended
Automotive Sensor Digitization (Non-Safety)
The LTC2389CUK-16 fits automotive non-safety sensor digitization such as body-control, HVAC, and cabin-comfort sensors where the 0°C to +70°C commercial grade is acceptable for interior-mounted ECUs. Its 16-bit resolution supports pressure, position, temperature, and flow sensors with high accuracy, ranging from the 0-4.096V unipolar input matches ratiometric sensor outputs without additional scaling. The integrated 4.096V reference eliminates a costly external reference in cost-sensitive body-electronics modules. The 48-QFN (7x7) package fits compact body-ECU form factors. For under-hood or safety-critical applications such as airbag or stability control, choose the LTC2389IUK-16 industrial-temp variant or a fully AEC-Q100-qualified ADC instead.
Recommended
Recommended Products Summary
Engineering reference data for LTC2389CUK-16 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC2389IUK-16 | LTC2389CUK-16#PBF | LTC2389CUK-16#TRPBF | LTC2389IUK-16#PBF | LTC2389IUK-16#TRPBF |
|---|---|---|---|---|---|---|
| Package | 48-QFN (7x7) | 48-QFN (7x7) - same | 48-QFN (7x7) - same | 48-QFN (7x7) - same | 48-QFN (7x7) - same | 48-QFN (7x7) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| Sampling Rate | 2.5 Msps | 2.5 Msps | 2.5 Msps | 2.5 Msps | 2.5 Msps | 2.5 Msps |
| Internal Reference | 4.096 V | 4.096 V | 4.096 V | 4.096 V | 4.096 V | 4.096 V |
| Operating Temperature | 0°C to +70°C | -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 |
| Lead-Free Finish | Standard | Standard | Pb-free (PBF) | Pb-free (PBF) | Pb-free (PBF) | Pb-free (PBF) |
| Packaging Form | Tube | Tube | Tray | Tape & Reel | Tray | Tape & Reel |
Key Differentiators
- Pin-configurable analog input ranges in a single part (vs LTC2387 (fixed-range SAR ADC))
- Integrated 4.096V reference + reference buffer (vs LTC2369 (requires external reference))
- Single 5V supply operation (vs LTC2379 (requires ±5V or 5V+2.5V supplies))
Design Notes
Decouple the VDD (5V) supply with a 10µF ceramic capacitor and a 0.1µF ceramic capacitor placed within 5 mm of the supply pin to suppress digital switching noise from corrupting the analog conversion. The internal 4.096V reference output (REFOUT) requires a 4.7µF low-ESR ceramic bypass capacitor to ground to minimize reference-noise coupling into the ADC. Power the ADC from a low-noise LDO (such as an LT1129 or LT3010) rather than directly from a switching regulator to avoid converter-induced reference jitter.
Route the analog input traces (IN+, IN-) as a matched differential pair with ground guard traces, keeping input source impedance under 50Ω to prevent aperture-jitter and AC-performance degradation. Place the reference bypass capacitor as close as possible to the REFOUT pin with a low-inductance ground return. Use a single star-ground topology tying the analog ground, reference ground, and digital ground at the exposed thermal pad to avoid ground loops that couple digital switching noise into the analog input.
Do not exceed the absolute maximum analog input voltage of VDD + 0.3V on the IN+ and IN- pins or the ADC may latch up. Do not operate the analog input above Nyquist (1.25 MHz at 2.5 Msps) without an anti-aliasing filter, which would fold high-frequency noise into the baseband. When using the parallel digital interface, route parallel data lines away from the analog input traces to prevent digital coupling into the analog front end.
Compliance Information
Pb-free (PBF) variants available per Analog Devices product page. Commercial temperature grade; not AEC-Q100 qualified - AEC-Q100 qualification not listed for this part family.
