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Analog Devices Inc. LTC2389HLX-18#PBF
- Part No.:
- LTC2389HLX-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-LQFP
- Datasheet:
-
LTC2389HLX-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:226
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Product details
Overview
LTC2389HLX-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, 2.5 Msps successive approximation register (SAR) analog-to-digital converter with pin-configurable analog input ranges (±4.096 V fully differential, 0–4.096 V pseudo-differential unipolar, ±2.048 V pseudo-differential bipolar), internal 4.096 V reference (±20 ppm/°C max), and 99.8 dB SNR (fully differential). It operates from a single 5 V supply and supports parallel/serial interfaces in a 48-pin LQFP package rated for –40°C to +125°C - ideal for high-speed, wide-dynamic-range data acquisition in harsh industrial environments.
For engineers reviewing the LTC2389HLX-18#PBF datasheet, LTC2389HLX-18#PBF pinout, LTC2389HLX-18#PBF application, or LTC2389HLX-18#PBF equivalent, this page delivers verified specifications, validated pin functions, temperature-grade-specific performance data (H-grade SNR/SINAD, INL/DNL, power-down current), real-world interface configurations (MODE0/MODE1, PD/FD, OB/2C), and direct alternative part comparisons - all aligned to the exact LTC2389HLX-18#PBF variant with extended temperature operation.
Technical Context
The LTC2389HLX-18#PBF implements a true SAR architecture with no pipeline delay or cycle latency, enabling deterministic timing for real-time control loops. Its internal oscillator eliminates external clock dependency for conversion timing, while the precision 4.096 V reference includes integrated buffering and guaranteed 0.5% initial accuracy.
Pin-configurable input modes are implemented via MODE0/MODE1 (bus format), PD/FD (full-scale range), and OB/2C (output coding), allowing seamless integration across signal chain topologies without external level-shifting. The H-grade variant maintains full 18-bit no-missing-codes performance and ≤±3 LSB INL over –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - guarantees 262,144 distinct output codes with no missing codes across full temperature range. |
| Sampling Rate | 2.5 Msps - enables real-time capture of signals up to 1.25 MHz (Nyquist) with zero-latency parallel readout. |
| SNR (Fully Diff) | 99.8 dB (typ) at fIN = 2 kHz - supports >16.5 effective number of bits (ENOB) for high-fidelity sensor digitization. |
| INL (Max) | ±3 LSB - ensures monotonicity and accurate end-point linearity critical for closed-loop feedback systems. |
| Reference Voltage | 4.096 V internal (±20 ppm/°C max tempco) - eliminates need for external reference and reduces BOM count. |
| Supply Voltage | VDD = 4.75–5.25 V; OVDD = 1.71–5.25 V - supports mixed-signal I/O interfacing with 1.8 V, 2.5 V, 3.3 V, or 5 V logic. |
| Power Dissipation | 162.5 mW at 2.5 Msps - enables high-speed operation within thermal constraints of compact industrial modules. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive sensing, downhole oil/gas instrumentation, and factory-floor PLCs. |
Pinout & Package
48-pin 7 mm × 7 mm plastic LQFP (LX package), RoHS-compliant, with exposed pad (Pin 49) soldered to PCB ground plane for thermal and electrical integrity. Pin count and layout match LTC2389-18 family; H-grade variant shares identical footprint with C/I-grade LX packages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 17, 20, 35, 41, 44, 48) | Ground reference | Multiple dedicated GND pins minimize ground bounce and ensure stable reference for analog and digital sections. |
| VDD (Pins 2, 3, 19, 40, 45, 46, 47) | Core supply | Seven VDD pins require local 0.1 µF + 10 µF ceramic decoupling each to suppress switching noise at 2.5 Msps. |
| IN+, IN– (Pins 42, 43) | Differential analog inputs | Accept ±4.096 V, 0–4.096 V, or ±2.048 V ranges based on PD/FD and OB/2C states - no external gain/level shift needed. |
| PD/FD (Pin 30) | Input range select | Configures full-scale range: low = fully differential (±4.096 V), high = pseudo-differential (unipolar/bipolar). |
| OB/2C (Pin 6) | Output coding select | Chooses offset binary (low) or two's complement (high) output format - matches host processor data handling. |
| MODE0/MODE1 (Pins 4, 5) | Interface mode control | Selects 18-bit parallel (00), 16-bit parallel (01), 8-bit parallel (10), or serial (11) - enables flexible MCU/FPGA interfacing. |
| CNVST (Pin 37) | Conversion start | Edge-triggered sampling command; tCNVSTL ≥ 20 ns ensures reliable capture in high-noise industrial settings. |
| BUSY (Pin 36) | Conversion status | Active-high signal indicates ongoing conversion; tBUSYLH = 13 ns (max) enables tight timing synchronization. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay, zero cycle latency | Enables immediate readout after BUSY deassertion - essential for time-critical control applications like motor commutation. |
| Pin-configurable analog input range | Supports three signal chain architectures (fully diff, unipolar, bipolar) with same hardware - reduces design iterations and inventory SKUs. |
| Internal 4.096 V reference with buffer | Eliminates external reference IC and associated passive components, reducing board area and improving long-term drift stability. |
| H-grade temperature rating (–40°C to +125°C) | Validated performance across full range - no derating required for high-ambient industrial or automotive under-hood use. |
| Parallel and serial interface modes | MODE0/MODE1 programmability allows reuse across resource-constrained (serial) and high-throughput (parallel) system designs. |
| Nap/sleep power-down modes | Reduces current to ≤250 µA - extends battery life in portable test equipment or intermittent-sampling IoT edge nodes. |
Applications
| Medical Imaging Signal Chain | Industrial Process Control Loop |
|---|---|
|
Use Scenario: Digitizing low-noise, wide-dynamic-range signals from ultrasound transducer arrays or MRI gradient amplifiers. IC Role / Device Role / Timing Role: High-precision ADC capturing baseband analog outputs with minimal quantization noise and deterministic latency. Use Value: 99.8 dB SNR and ±3 LSB INL preserve small-signal integrity in diagnostic imaging, directly impacting image resolution and contrast fidelity. |
Use Scenario: Closed-loop monitoring of pressure, temperature, and flow sensors in chemical plant DCS systems operating at 125°C ambient. IC Role / Device Role / Timing Role: Primary data acquisition node converting conditioned sensor outputs into digital feedback for PID controllers. Use Value: Guaranteed –40°C to +125°C operation and no-missing-codes behavior ensure continuous, trustworthy process regulation without calibration drift. |
| Automotive Powertrain Test Equipment | High-Speed ATE for Precision Sensors |
|
Use Scenario: Capturing fast transient waveforms from engine knock sensors and exhaust gas oxygen (EGO) circuits during ECU validation. IC Role / Device Role / Timing Role: High-speed SAR ADC synchronizing with ignition events using CNVST-triggered sampling and BUSY-driven readout. Use Value: 2.5 Msps throughput and 245 ns conversion time resolve microsecond-scale combustion anomalies, improving fault detection accuracy. |
Use Scenario: Automated test systems validating 16–18-bit MEMS accelerometers, gyroscopes, and strain gauges requiring traceable metrology-grade measurement. IC Role / Device Role / Timing Role: Metrology-grade digitizer providing calibrated reference measurements against NIST-traceable standards. Use Value: Internal 4.096 V reference with ±20 ppm/°C tempco and 0.5% initial accuracy eliminates external reference calibration overhead in production test fixtures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, high-resolution SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8860IRGET | 16-bit, 1 Msps, SPI-only interface, no internal reference, –40°C to +85°C | Limited resolution and speed; requires external reference and level-shifting for bipolar inputs | Select when cost-sensitive, lower-performance industrial monitoring suffices and serial-only interface is acceptable. |
| AD7606C-18BSTZ | 18-bit, 1 Msps, simultaneous sampling (8-channel), internal reference (±10 ppm/°C), –40°C to +125°C | Lower throughput but multi-channel capability; uses parallel interface only (no serial mode) | Select for multi-sensor synchronized acquisition (e.g., vibration analysis) where channel count outweighs single-channel speed. |
Compared with ADS8860IRGET and AD7606C-18BSTZ, the LTC2389HLX-18#PBF uniquely combines 2.5 Msps speed, pin-configurable input ranges, dual parallel/serial interface flexibility, and H-grade temperature robustness - making it optimal for single-channel, high-fidelity, thermally demanding applications where timing determinism and signal chain simplification are critical.
Availability
LTC2389HLX-18#PBF is available at Aetrix Electronics and suitable for medical imaging signal chains, industrial process control loops, and automotive powertrain test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2389HLX-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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2389-18 product line delivers high-speed, high-accuracy SAR ADCs optimized for applications demanding wide dynamic range, low latency, and robust operation in thermally challenging environments - including test equipment, instrumentation, and real-time control systems.
FAQ
What is the maximum sampling rate of the LTC2389HLX-18#PBF?
The LTC2389HLX-18#PBF achieves a maximum sampling rate of 2.5 Msps in parallel output modes. In serial mode, the rate is reduced to 1.9 Msps due to SCK timing constraints. This throughput is maintained across the full –40°C to +125°C operating range without derating, and the device exhibits zero cycle latency - meaning the conversion result is immediately available upon BUSY deassertion.
Does the LTC2389HLX-18#PBF include an internal voltage reference?
Yes, the LTC2389HLX-18#PBF integrates a precision 4.096 V internal reference with guaranteed 0.5% initial accuracy and a maximum temperature coefficient of ±20 ppm/°C over –40°C to +125°C. It also includes a reference buffer, eliminating the need for external buffering and supporting direct connection to REFIN/REFOUT/REFSENSE pins without additional components.
How does the pin configuration affect analog input range on the LTC2389HLX-18#PBF?
The LTC2389HLX-18#PBF supports three analog input ranges via two control pins: PD/FD (Pin 30) and OB/2C (Pin 6). When PD/FD = low, the device operates in fully differential mode (±4.096 V); when PD/FD = high, OB/2C selects between pseudo-differential unipolar (0–4.096 V, OB/2C = low) and pseudo-differential bipolar (±2.048 V, OB/2C = high). All configurations are validated across the H-grade temperature range.
What package type and thermal characteristics apply to the LTC2389HLX-18#PBF?
The LTC2389HLX-18#PBF uses a 48-pin 7 mm × 7 mm plastic LQFP (LX package) with exposed pad (Pin 49) that must be soldered to the PCB ground plane. Its thermal resistance is θJA = 50°C/W. The H-grade qualification ensures guaranteed operation from –40°C to +125°C junction temperature, with maximum power dissipation of 162.5 mW at 2.5 Msps and ≤250 µA in power-down mode.
Can the LTC2389HLX-18#PBF interface with 1.8 V logic systems?
Yes, the LTC2389HLX-18#PBF supports OVDD from 1.71 V to 5.25 V, enabling direct interfacing with 1.8 V, 2.5 V, 3.3 V, or 5 V digital systems. Digital input thresholds scale with OVDD (VIH = 0.8 × OVDD, VIL = 0.2 × OVDD), and output drive strength is specified down to 1.71 V OVDD - ensuring reliable communication with modern low-voltage FPGAs and microcontrollers without level translators.
LTC2389HLX-18#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-LQFP
- Packaging:
- Tray
- 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 ~ 125°C
- Supplier Device Package:
- 48-LQFP (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2389HLX-18#PBF FAQ
1.How can I place an order for LTC2389HLX-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2389HLX-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 LTC2389HLX-18#PBF reliable?
The price and inventory of LTC2389HLX-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 LTC2389HLX-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2389HLX-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2389HLX-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2389HLX-18#PBF?
LTC2389HLX-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2389HLX-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 LTC2389HLX-18#PBF?
For technical support, including LTC2389HLX-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2389HLX-18#PBF requirements.
6.How does Aetrix verify that LTC2389HLX-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2389HLX-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 LTC2389HLX-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2389HLX-18#PBF?
All LTC2389HLX-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2389HLX-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 LTC2389HLX-18#PBF part is unused and in its original packaging.
Return procedure for LTC2389HLX-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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