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Analog Devices Inc. LTC2389IUK-18#PBF
- Part No.:
- LTC2389IUK-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC2389IUK-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,794
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Product details
Overview
LTC2389IUK-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, 2.5Msps successive approximation register (SAR) analog-to-digital converter with pin-configurable analog input ranges (±4.096V fully differential, 0–4.096V pseudo-differential unipolar, ±2.048V pseudo-differential bipolar), internal 4.096V reference (±20ppm/°C max), and 99.8dB SNR (fully differential). It operates from a single 5V supply and targets high-speed, wide-dynamic-range data acquisition in industrial process control and medical imaging systems.
For engineers reviewing the LTC2389IUK-18#PBF datasheet, LTC2389IUK-18#PBF pinout, LTC2389IUK-18#PBF application, or LTC2389IUK-18#PBF equivalent, key selection criteria include guaranteed no-missing-codes at 18 bits, ±3LSB INL (max), 2.5Msps throughput with zero cycle latency in parallel mode, and support for 1.8V–5V I/O voltage levels across its 48-pin QFN package.
Technical Context
The LTC2389IUK-18#PBF implements a precision SAR architecture with internal oscillator-based timing, eliminating external clock synchronization requirements. Its pin-configurable input range selection (via MODE0/MODE1/OB/2C/PD/FD) enables direct interface to diverse signal chain topologies-fully differential, pseudo-differential unipolar, or pseudo-differential bipolar-without external level-shifting circuitry.
It integrates a buffered 4.096V reference with 0.5% initial accuracy and supports both parallel (18-/16-/8-bit) and serial (SPI-compatible) output modes via MODE[1:0] configuration. The device guarantees operation from –40°C to +85°C and dissipates only 162.5mW at full 2.5Msps throughput, with nap/sleep power-down modes reducing current to ≤250µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit, guaranteed no missing codes - ensures full dynamic range utilization without code gaps in critical measurement applications. |
| Sampling Rate | 2.5Msps maximum - enables real-time capture of signals up to ~1.25MHz Nyquist bandwidth with minimal aliasing risk. |
| SNR (fully diff) | 99.8dB typical at fIN = 2kHz - delivers >16.5 effective number of bits (ENOB) for ultra-low-noise precision acquisition. |
| INL (max) | ±3LSB over temperature - maintains end-point linearity accuracy for calibration-sensitive instrumentation and ATE. |
| Reference | Internal 4.096V ±20ppm/°C max - eliminates need for external reference and buffer, simplifying BOM and layout while ensuring stable full-scale scaling. |
| Power Dissipation | 162.5mW at 2.5Msps - achieves high-speed performance with low thermal load, suitable for dense PCB layouts. |
| I/O Voltage Range | 1.8V to 5V - allows direct interfacing with modern low-voltage FPGAs and microcontrollers without level translators. |
Pinout & Package
Package: 48-lead 7mm × 7mm plastic QFN (UK package) with exposed pad (Pin 49 = GND), rated for –40°C to +85°C operating temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,17,20,35,41,44,48, EP) | Ground reference and thermal path | All GND pins and exposed pad must be soldered to PCB ground plane for optimal noise immunity and thermal dissipation. |
| VDD (Pins 2,3,19,40,45,46,47) | Core analog/digital supply | 5V ±2.5% supply; requires local 0.1µF + 10µF ceramic decoupling per pin group to suppress switching noise. |
| OVDD (Pin 18) | I/O interface supply | 1.71V–5.25V programmable logic interface supply; independent of VDD, enabling mixed-voltage system integration. |
| MODE0/MODE1 (Pins 4,5) | Data bus configuration control | Selects 18-bit parallel, 16-bit parallel, 8-bit parallel, or serial output mode; determines active data bus width and addressing behavior. |
| OB/2C & PD/FD (Pins 6,30) | Analog input range and data format selector | Jointly configure input range (±4.096V / 0–4.096V / ±2.048V) and output coding (offset binary or two's complement). |
| IN+, IN– (Pins 42,43) | Differential analog input terminals | Accept fully differential signals up to ±4.096V; common-mode voltage fixed at VCM = 2.048V in fully diff mode. |
| REFOUT/REFIN/REFSENSE (Pins 38,39,40) | Reference voltage interface | REFOUT provides internal 4.096V reference; REFIN accepts external reference; REFSENSE enables Kelvin sensing for improved accuracy. |
| CNVST (Pin 37) | Conversion start trigger | Edge-triggered sampling command; tCNVSTL ≥20ns low pulse width required to initiate conversion cycle. |
| BUSY (Pin 36) | Conversion status indicator | Active-high open-drain output signaling ongoing conversion; tBUSYLH = 13ns delay from CNVST↓ enables precise timing coordination. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-configurable input ranges | Single hardware configuration supports ±4.096V fully differential, 0–4.096V unipolar, or ±2.048V bipolar inputs - eliminates redesign when signal chain topology changes. |
| No pipeline delay / zero cycle latency | Immediate availability of conversion result after BUSY deassertion in parallel modes - essential for deterministic real-time control loops. |
| Internal reference with buffer | 4.096V ±0.5% initial accuracy and ±20ppm/°C tempco, with integrated buffer - removes external reference IC and reduces board area by ~30mm². |
| Multi-mode digital interface | MODE[1:0] selects between 18-bit parallel, segmented 16/8-bit parallel, or SPI-compatible serial output - maximizes flexibility across host processor capabilities. |
| Low-power nap/sleep modes | Reduces total supply current to ≤250µA during idle periods - extends uptime in battery-powered portable instrumentation and remote sensors. |
Applications
| Medical Imaging | High-Speed Data Acquisition |
|---|---|
|
Use Scenario: Digitizing ultrasound echo signals or MRI gradient waveforms requiring >95dB SNR and sub-100ns transient response. IC Role / Device Role / Timing Role: Primary ADC capturing baseband analog sensor outputs with minimal aperture jitter (1ps RMS) and fast full-scale step recovery (70ns). Use Value: 99.8dB SNR and 99.7dB SINAD enable detection of weak tissue reflections amid high-frequency noise, improving diagnostic resolution. |
Use Scenario: Real-time spectral analysis in automated test equipment using 32k-point FFT at 2.5Msps sampling rate. IC Role / Device Role / Timing Role: High-throughput digitizer feeding FPGA-based FFT engine with deterministic parallel output and zero-latency timing. Use Value: 2.5Msps sustained throughput with no pipeline delay ensures time-coherent sample sets for accurate frequency-domain analysis. |
| Industrial Process Control | High-Precision Instrumentation |
|
Use Scenario: Monitoring multi-channel analog sensor arrays (e.g., strain gauges, RTDs) in PLC I/O modules under harsh EMI environments. IC Role / Device Role / Timing Role: Precision SAR ADC with 70dB CMRR and ±3LSB INL providing calibrated measurements across –40°C to +85°C ambient range. Use Value: Guaranteed no-missing-codes and low DNL (±0.3LSB) ensure monotonicity critical for closed-loop feedback stability in servo drives. |
Use Scenario: Benchtop digital multimeters and oscilloscope front-ends demanding 18-bit resolution and <10ppm/°C gain drift. IC Role / Device Role / Timing Role: Reference-grade ADC with internal 4.096V reference (±20ppm/°C) and Kelvin-sense REFSENSE for metrology-grade accuracy. Use Value: Integrated reference buffer and low full-scale error drift (±5ppm/°C) eliminate external trimming, reducing calibration labor by ~40%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8860IRGET | 16-bit, 1Msps, external reference only, no pin-configurable input range, 92dB SNR | Limited to lower resolution and speed; requires external reference and level-shifting for bipolar inputs | Choose when cost sensitivity outweighs need for 18-bit resolution and flexible input configuration. |
| AD7606C-18BSTZ | 8-channel simultaneous-sampling, 18-bit, 1Msps, on-chip reference (±10ppm/°C), ±10V input range | Integrated multiplexer and oversampling filter; optimized for multi-sensor monitoring, not single-channel high-speed capture | Prefer for multi-channel synchronized acquisition where channel count >1 and throughput <2Msps suffices. |
Compared with ADS8860IRGET and AD7606C-18BSTZ, the LTC2389IUK-18#PBF uniquely combines single-channel 2.5Msps speed, 18-bit no-missing-code guarantee, and hardware-selectable input ranges - making it optimal for space-constrained, high-fidelity signal capture where flexibility and speed are non-negotiable.
Availability
LTC2389IUK-18#PBF is available at Aetrix Electronics and suitable for medical imaging systems, industrial process controllers, and high-precision instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2389IUK-18#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2389IUK-18#PBF belongs to ADI's precision SAR ADC product line, designed specifically for applications demanding ultra-low noise, high throughput, and configurable analog interfaces in harsh or space-constrained environments.
FAQ
What is the operating temperature range for the LTC2389IUK-18#PBF?
The LTC2389IUK-18#PBF is specified for operation from –40°C to +85°C, matching the "I" grade designation in its part number. This range is validated across all key AC and DC specifications including SNR, INL, and reference stability, making it suitable for industrial and outdoor deployed systems where ambient extremes are expected.
Does the LTC2389IUK-18#PBF require an external reference?
No - the LTC2389IUK-18#PBF includes a precision internal 4.096V reference with ±20ppm/°C maximum temperature coefficient and 0.5% initial accuracy. REFOUT is available at Pin 38, and REFIN (Pin 39) allows optional external reference substitution if tighter tolerance or different voltage is needed. REFSENSE (Pin 40) supports Kelvin sensing for highest accuracy.
How does the LTC2389IUK-18#PBF support different analog input configurations?
The LTC2389IUK-18#PBF uses three control pins - OB/2C (Pin 6), PD/FD (Pin 30), and MODE[1:0] (Pins 4–5) - to select among three input ranges: ±4.096V fully differential, 0–4.096V pseudo-differential unipolar, and ±2.048V pseudo-differential bipolar. Each configuration also determines output data format (offset binary or two's complement), all implemented in hardware without firmware overhead.
What digital interface options does the LTC2389IUK-18#PBF offer?
The LTC2389IUK-18#PBF supports four output modes selected via MODE[1:0]: 18-bit parallel (MODE=00), 16-bit parallel (MODE=01), 8-bit parallel (MODE=10), and serial (MODE=11). In serial mode, it functions as an SPI-compatible slave with SDO, SDI, and SCK pins (Pins 23,22,24), supporting daisy-chaining of multiple devices on a single SDO line.
Is the LTC2389IUK-18#PBF pin-compatible with other members of the LTC238x family?
Yes - the LTC2389IUK-18#PBF shares identical 48-pin QFN (UK) packaging and pinout with the LTC2380-16 and LTC2381-16 16-bit variants. This enables drop-in upgrades from 16-bit to 18-bit resolution in existing designs, provided the host system can accommodate the wider data bus and updated timing constraints.
LTC2389IUK-18#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 2.5M
- Number of Inputs:
- 1
- Input Type:
- Differential, Pseudo-Differential
- Data Interface:
- SPI, Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- Selectable Address
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 48-QFN (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2389IUK-18#PBF FAQ
1.How can I place an order for LTC2389IUK-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2389IUK-18#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC2389IUK-18#PBF reliable?
The price and inventory of LTC2389IUK-18#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2389IUK-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2389IUK-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2389IUK-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2389IUK-18#PBF?
LTC2389IUK-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2389IUK-18#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC2389IUK-18#PBF?
For technical support, including LTC2389IUK-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2389IUK-18#PBF requirements.
6.How does Aetrix verify that LTC2389IUK-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2389IUK-18#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC2389IUK-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2389IUK-18#PBF?
All LTC2389IUK-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2389IUK-18#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC2389IUK-18#PBF part is unused and in its original packaging.
Return procedure for LTC2389IUK-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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