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Analog Devices Inc. LTC2389CLX-18#PBF
- Part No.:
- LTC2389CLX-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-LQFP
- Datasheet:
-
LTC2389CLX-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:244
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Product details
Overview
LTC2389CLX-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, 0V–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 medical imaging and precision instrumentation.
For engineers reviewing the LTC2389CLX-18#PBF datasheet, LTC2389CLX-18#PBF pinout, LTC2389CLX-18#PBF application, or LTC2389CLX-18#PBF equivalent, this page delivers verified specifications, validated LQFP-48 pin functions, real-world use cases in ATE and industrial process control, and two confirmed alternative SAR ADCs with documented interface and performance trade-offs.
Technical Context
The LTC2389CLX-18#PBF implements a true SAR architecture with no pipeline delay or cycle latency, enabling deterministic timing for time-critical sampling. Its internal oscillator eliminates external clock dependency for conversion timing, while MODE0/MODE1 pins configure parallel (18-/16-/8-bit) or serial (SPI-compatible) output formats without changing hardware layout.
Analog input flexibility is achieved via OB/2C and PD/FD pins, selecting both input range and output coding format (offset binary or two's complement). The integrated reference buffer drives the internal 4.096V reference directly, supporting stable operation across temperature (guaranteed to 125°C for H-grade variants) and eliminating need for external buffering in most designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit with guaranteed no missing codes - ensures full dynamic range utilization in precision measurement systems. |
| Sampling Rate | 2.5Msps maximum - supports real-time capture of signals up to ~50MHz Nyquist bandwidth (–3dB input BW = 50MHz). |
| SNR (Fully Diff) | 99.8dB typical at fIN = 2kHz - enables >16.6 effective bits (ENOB) for ultra-low-noise signal chain design. |
| INL (Max) | ±3LSB over full temperature range - maintains linearity critical for calibration-sensitive applications like medical CT. |
| Reference | Internal 4.096V ±0.5% initial accuracy, ±20ppm/°C max tempco - reduces BOM count and improves system-level drift performance. |
| Power Dissipation | 162.5mW at 2.5Msps - balances speed and thermal load in compact, fanless industrial enclosures. |
| I/O Voltage Range | 1.8V to 5V OVDD - allows direct interfacing with FPGA I/O banks or microcontroller GPIO without level shifters. |
Pinout & Package
Package: 48-pin 7mm × 7mm plastic LQFP (LX package), lead-free finish, operating temperature range 0°C to 70°C (C-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,17,20,35,41,44,48) | Ground reference | Multiple dedicated ground pins minimize ground bounce and improve noise immunity in high-speed digital switching. |
| VDD (Pins 2,3,19,40,45,46,47) | Core analog/digital supply | 7 VDD pins require individual 0.1µF + 10µF ceramic decoupling - essential for maintaining 99.8dB SNR performance. |
| MODE0/MODE1 (Pins 4,5) | Output interface configuration | Selects 18-bit parallel, 16-bit parallel, 8-bit parallel, or serial mode - enables flexible host processor compatibility. |
| OB/2C (Pin 6) & PD/FD (Pin 30) | Analog input range and coding control | Jointly configure ±4.096V FD / 0–4.096V PU / ±2.048V PB ranges and offset binary/two's complement output format. |
| IN+/IN– (Pins 42,43) | Differential analog inputs | Supports fully differential signaling with 70dB CMRR - rejects common-mode noise in motor drive current sensing. |
| REFOUT/REFIN/REFSENSE (Pins 46,47,45) | Internal reference interface | REFOUT provides buffered 4.096V; REFIN accepts external reference; REFSENSE enables Kelvin sensing for high-accuracy reference routing. |
| CS/CNVST/BUSY (Pins 36,37,38) | Conversion control & status | Hardware-triggered sampling (CNVST) with BUSY flag enables precise timing synchronization in multi-channel systems. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Zero-cycle latency enables immediate readout after CNVST edge - critical for closed-loop control with sub-400ns total conversion cycle. |
| Pin-configurable input range | Single hardware design supports three signal chain topologies (FD/PU/PB) without redesign - reduces qualification effort across product variants. |
| Internal reference buffer | Eliminates need for external op-amp buffer - saves PCB area and avoids gain/phase errors that degrade THD (<–116dB). |
| Nap/sleep power-down modes | Reduces current to ≤250µA - extends battery life in portable diagnostic equipment during idle periods between acquisitions. |
| Guaranteed operation to 125°C | H-grade variant (LTC2389HLX-18#PBF) qualified for under-hood automotive or downhole oil & gas sensors - C-grade rated to 70°C. |
Applications
| Medical Imaging | High-Speed Data Acquisition |
|---|---|
|
Use Scenario: Digitizing X-ray detector outputs in computed tomography (CT) scanners requiring >99dB SNR and minimal harmonic distortion. IC Role / Device Role / Timing Role: Primary ADC capturing 2.5Msps projection data with deterministic latency for real-time image reconstruction. Use Value: 99.8dB SNR and –116dB THD preserve low-contrast detail in reconstructed slices; no missing codes prevent artifact generation. |
Use Scenario: High-fidelity waveform capture in automated test equipment (ATE) for semiconductor parametric testing. IC Role / Device Role / Timing Role: Precision digitizer synchronized to pattern generator clocks via CNVST for repeatable timing margin analysis. Use Value: 2.5Msps throughput with zero latency enables 400ns sampling period compliance; ±3LSB INL ensures pass/fail threshold accuracy. |
| Industrial Process Control | Instrumentation |
|
Use Scenario: Monitoring high-voltage motor phase currents using isolated amplifiers feeding pseudo-differential unipolar inputs. IC Role / Device Role / Timing Role: Isolated current-sense ADC interfacing to FPGA via 18-bit parallel bus with MODE0/MODE1 set to 00. Use Value: 0V–4.096V input range matches isolated amplifier output swing; internal reference eliminates external voltage reference drift errors. |
Use Scenario: Portable spectrum analyzers requiring wide dynamic range and low power in handheld form factors. IC Role / Device Role / Timing Role: Core ADC in battery-powered RF front-end, leveraging nap mode between FFT acquisitions to extend runtime. Use Value: 162.5mW active power and ≤250µA nap current enable >8-hour operation on 2000mAh Li-ion; 95.2dB SNR supports 120dB spurious-free range. |
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 |
|---|---|---|---|
| AD7641ASTZ | 18-bit, 2Msps, external reference only, no pin-configurable input range, requires external reference buffer. | Lacks integrated reference and input range flexibility - demands additional components for same functionality as LTC2389CLX-18#PBF. | Choose when external reference control is required and board space permits added support circuitry. |
| ADS8860IRGET | 16-bit, 1Msps, internal reference (4.096V), SPI-only interface, no parallel output option. | Lower resolution and speed; limited to SPI communication - unsuitable for FPGA-based parallel-bus systems needing 2.5Msps. | Choose for cost-sensitive, lower-performance portable instrumentation where 16-bit resolution suffices. |
Compared with AD7641ASTZ and ADS8860IRGET, the LTC2389CLX-18#PBF uniquely integrates reference, input range selection, and parallel/serial configurability in a single 48-pin LQFP - reducing component count, layout complexity, and qualification overhead for high-precision, high-throughput applications.
Availability
LTC2389CLX-18#PBF is available at Aetrix Electronics and suitable for medical imaging systems, industrial process controllers, and automated test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC2389CLX-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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing ICs for precision, power, and connectivity applications.
The LTC2389 family was designed for high-speed, high-resolution data acquisition in demanding environments - emphasizing low noise, flexible signal interfacing, and robust operation across industrial and medical temperature ranges.
FAQ
What is the maximum sampling rate of the LTC2389CLX-18#PBF?
The LTC2389CLX-18#PBF achieves a maximum sampling rate of 2.5Msps in parallel output modes. In serial mode, the maximum rate is 1.9Msps due to SCK timing constraints. This is confirmed in the Timing Characteristics table (page 5 of the datasheet), where fSMPL is specified as 2.5Msps (parallel) and 1.9Msps (serial) over the full temperature range.
Does the LTC2389CLX-18#PBF include an internal voltage reference?
Yes, the LTC2389CLX-18#PBF includes a precision internal 4.096V reference with guaranteed 0.5% initial accuracy and a maximum temperature coefficient of ±20ppm/°C. The reference is accessible at the REFOUT pin and can be used directly or bypassed in favor of an external reference via the REFIN pin.
What package type and pin count does the LTC2389CLX-18#PBF use?
The LTC2389CLX-18#PBF uses a 48-pin 7mm × 7mm plastic LQFP (LX package), as explicitly stated in the Order Information table (page 2 of the datasheet) and confirmed by the "TOP VIEW LX PACKAGE" diagram on page 2. It is distinct from the QFN (UK) variant used in other part numbers like LTC2389CUK-18#PBF.
How does the LTC2389CLX-18#PBF support different analog input configurations?
The LTC2389CLX-18#PBF supports three analog input ranges - ±4.096V fully differential, 0V–4.096V pseudo-differential unipolar, and ±2.048V pseudo-differential bipolar - via the logic states of OB/2C (Pin 6) and PD/FD (Pin 30), as defined in Table 2 (page 3 of the datasheet). No external components are needed to switch between these modes.
Is the LTC2389CLX-18#PBF compatible with 1.8V I/O interfaces?
Yes, the LTC2389CLX-18#PBF supports I/O voltages from 1.8V to 5V via the OVDD supply pin (Pin 18). Digital input thresholds scale with OVDD (VIH = 0.8•OVDD, VIL = 0.2•OVDD), and output drive levels are referenced to OVDD - enabling direct connection to 1.8V FPGA banks or microcontrollers without level translation.
LTC2389CLX-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:
- 0°C ~ 70°C
- Supplier Device Package:
- 48-LQFP (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2389CLX-18#PBF FAQ
1.How can I place an order for LTC2389CLX-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2389CLX-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 LTC2389CLX-18#PBF reliable?
The price and inventory of LTC2389CLX-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 LTC2389CLX-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2389CLX-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2389CLX-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2389CLX-18#PBF?
LTC2389CLX-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2389CLX-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 LTC2389CLX-18#PBF?
For technical support, including LTC2389CLX-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2389CLX-18#PBF requirements.
6.How does Aetrix verify that LTC2389CLX-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2389CLX-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 LTC2389CLX-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2389CLX-18#PBF?
All LTC2389CLX-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2389CLX-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 LTC2389CLX-18#PBF part is unused and in its original packaging.
Return procedure for LTC2389CLX-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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