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Analog Devices Inc. LTC2389ILX-18#PBF
- Part No.:
- LTC2389ILX-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-LQFP
- Datasheet:
-
LTC2389ILX-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,288
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Product details
Overview
LTC2389ILX-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 LTC2389ILX-18#PBF datasheet, LTC2389ILX-18#PBF pinout, LTC2389ILX-18#PBF application, or LTC2389ILX-18#PBF equivalent, key selection criteria include guaranteed no-missing-codes at 18 bits, ±3LSB INL (max), −116dB THD (fully differential), parallel/serial interface flexibility, and operation across −40°C to +85°C.
Technical Context
The LTC2389ILX-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 MODE0/MODE1 pins configure output bus width (18-/16-/8-bit parallel or serial) and OB/2C+PD/FD pins jointly select input range and data format (offset binary or two's complement).
It integrates a precision internal reference buffer and supports 1.8V–5V I/O voltage (OVDD), allowing direct interfacing with modern low-voltage FPGAs and microcontrollers. The 48-pin LQFP package includes dedicated ground planes and VDD bypassing provisions to maintain 99.8dB SNR performance at 2.5Msps throughput.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - guarantees no missing codes and full utilization of dynamic range in high-fidelity signal capture. |
| Sampling Rate | 2.5Msps - enables real-time digitization of signals up to ~1.25MHz Nyquist bandwidth without undersampling. |
| SNR (Fully Diff.) | 99.8dB typical at fIN = 2kHz - delivers >16.5 effective number of bits (ENOB) for precision measurement applications. |
| INL (Max) | ±3LSB - ensures monotonicity and accurate end-point linearity critical for closed-loop feedback and calibration. |
| Reference | Internal 4.096V ±20ppm/°C - eliminates external reference component count and drift sensitivity in compact designs. |
| Power Dissipation | 162.5mW at 2.5Msps - balances high-speed performance with thermal manageability in dense PCB layouts. |
| Operating Temp. | −40°C to +85°C - qualified for industrial and extended-temperature embedded instrumentation environments. |
Pinout & Package
Package: 48-lead 7mm × 7mm plastic LQFP (LX), RoHS-compliant, with exposed pad (Pin 49) soldered to ground plane for thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,17,20,35,41,44,48 + Exposed Pad 49) | Ground Reference | Multiple low-inductance ground connections required to minimize digital switching noise coupling into analog path. |
| VDD (Pins 2,3,19,40,45,46,47) | Analog Core Supply | 4.75V–5.25V supply; each pin requires local 0.1µF + 10µF ceramic decoupling to sustain 99.8dB SNR. |
| IN+, IN− (Pins 42,43) | Differential Analog Input | Accepts ±4.096V, 0–4.096V, or ±2.048V ranges based on OB/2C and PD/FD states; CMRR ≥70dB. |
| REFOUT, REFIN, REFSENSE (Pins 47,46,39) | Reference Interface | REFOUT provides buffered 4.096V reference; REFIN accepts internal or external reference; REFSENSE enables Kelvin sensing. |
| CNVST (Pin 38) | Conversion Start | Edge-triggered sampling command; tCNVSTL ≥20ns low time ensures reliable acquisition initiation. |
| BUSY (Pin 37) | Conversion Status | Active-high open-drain output indicating conversion in progress; tBUSYLH ≤13ns enables tight timing synchronization. |
| MODE0/MODE1 (Pins 4,5) | Interface Configuration | Selects 18-bit/16-bit/8-bit parallel or serial output mode; unused data lines go Hi-Z to reduce bus contention. |
| OB/2C & PD/FD (Pins 6,30) | Input Range & Format Control | Jointly configure analog input range and output coding (offset binary or two's complement) without external logic. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Zero-cycle latency enables immediate use of conversion result in time-critical control algorithms. |
| Pin-configurable input range | Single device replaces multiple ADC variants-eliminates BOM proliferation for multi-signal-chain systems. |
| Internal reference buffer | Drives external circuitry (e.g., driver op-amps) without gain/phase error; avoids need for discrete buffer IC. |
| Nap/sleep power-down modes | Reduces current to ≤250µA during idle periods-critical for battery-backed or energy-constrained DAQ modules. |
| 1.8V–5V I/O compatibility | Direct interface with 1.8V, 2.5V, 3.3V, or 5V logic families-no level shifters required in mixed-voltage systems. |
Applications
| Medical Imaging Signal Chain | High-Speed Industrial DAQ |
|---|---|
|
Use Scenario: Digitizing low-noise CT or MRI sensor outputs requiring >95dB SNR and precise DC accuracy. IC Role / Device Role / Timing Role: Primary high-resolution ADC capturing analog front-end signals with deterministic 400ns sample period. Use Value: 99.8dB SNR and ±3LSB INL ensure faithful representation of subtle tissue contrast gradients without post-processing correction. |
Use Scenario: Real-time monitoring of motor phase currents and vibration spectra in predictive maintenance gateways. IC Role / Device Role / Timing Role: Simultaneous sampling node feeding FPGA-based FFT engine at 2.5Msps with no latency-induced phase skew. Use Value: Fully differential input range (±4.096V) directly interfaces isolated current shunt amplifiers; no external level-shifting components needed. |
| Automated Test Equipment (ATE) | High-Precision Instrumentation |
|
Use Scenario: Stimulus-response testing of RF power amplifiers using wide-dynamic-range digitization of output spectra. IC Role / Device Role / Timing Role: High-speed acquisition channel synchronized to pattern generator via CNVST edge; BUSY used for trigger alignment. Use Value: −116dB THD and 117dB SFDR enable clean spectral analysis of amplifier nonlinearities without harmonic masking. |
Use Scenario: Portable calibrator generating traceable DC/AC standards for field metrology tools. IC Role / Device Role / Timing Role: Precision reference monitor and self-calibration engine using internal 4.096V reference as golden standard. Use Value: ±20ppm/°C reference tempco and <±10ppm/°C zero-scale drift support <0.01% accuracy over temperature without recalibration. |
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 |
|---|---|---|---|
| AD7986BCPZ-RL7 | 18-bit, 2.5Msps, but uses external reference only; no internal REFOUT/REFIN; 48-lead LFCSP package. | Requires external 4.096V reference and buffer; less suitable for space-constrained or reference-integration-sensitive designs. | Choose when reference flexibility or lower thermal resistance (θJA = 26°C/W) outweighs integration benefits. |
| ADS8860IPWR | 16-bit, 1Msps, internal reference (2.5V), SPI-only interface, 16-pin WQFN; lower resolution and speed. | Insufficient for 18-bit fidelity or 2.5Msps throughput; limited to mid-speed portable instrumentation. | Choose only for cost-sensitive, lower-performance applications where 16-bit resolution and 1Msps suffice. |
Compared with AD7986BCPZ-RL7 and ADS8860IPWR, the LTC2389ILX-18#PBF uniquely combines integrated reference, pin-configurable input ranges, parallel/serial interface, and guaranteed 18-bit no-missing-codes-making it optimal for compact, high-fidelity, multi-mode DAQ systems demanding minimal external components and deterministic timing.
Availability
LTC2389ILX-18#PBF is available at Aetrix Electronics and suitable for medical imaging signal chains, high-speed industrial data acquisition, automated test equipment, and precision instrumentation requiring stable component supply across extended temperature ranges.
Supply support for LTC2389ILX-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 technologies.
The LTC2389 family was designed for high-speed, high-accuracy data acquisition in space-, power-, and noise-constrained systems-emphasizing integration, flexibility, and guaranteed performance across temperature.
FAQ
What is the maximum operating temperature range for the LTC2389ILX-18#PBF?
The LTC2389ILX-18#PBF is rated for operation from −40°C to +85°C, as confirmed by its "I" grade designation and Absolute Maximum Ratings table. This extends beyond commercial-grade variants (0°C to 70°C) and supports deployment in industrial enclosures and outdoor instrumentation without forced cooling.
Does the LTC2389ILX-18#PBF require an external reference?
No-the LTC2389ILX-18#PBF includes a precision internal 4.096V reference with ±20ppm/°C max temperature coefficient and integrated reference buffer. External reference is optional via the REFIN pin, but not required for full specification compliance.
How does the MODE0/MODE1 configuration affect the LTC2389ILX-18#PBF's output interface?
MODE0/MODE1 selects between four interface modes: 00 = 18-bit parallel, 01 = 16-bit parallel, 10 = 8-bit parallel with address inputs, and 11 = serial (SPI-compatible). Unused data pins enter Hi-Z state, preventing bus contention in multiplexed or shared-data-bus architectures.
What is the significance of the OB/2C and PD/FD pins on the LTC2389ILX-18#PBF?
OB/2C and PD/FD jointly configure both analog input range (±4.096V, 0–4.096V, or ±2.048V) and output data format (offset binary or two's complement). This dual-role control eliminates external logic or software mapping, simplifying firmware and reducing PCB routing complexity.
Can the LTC2389ILX-18#PBF operate with a 1.8V I/O supply?
Yes-the LTC2389ILX-18#PBF supports OVDD from 1.71V to 5.25V, enabling direct connection to 1.8V FPGA I/O banks or microcontroller GPIOs without level translation. Digital timing parameters (e.g., tSCK, tDSI) remain valid across this full OVDD range.
LTC2389ILX-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 ~ 85°C
- Supplier Device Package:
- 48-LQFP (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2389ILX-18#PBF FAQ
1.How can I place an order for LTC2389ILX-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2389ILX-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 LTC2389ILX-18#PBF reliable?
The price and inventory of LTC2389ILX-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 LTC2389ILX-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2389ILX-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2389ILX-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2389ILX-18#PBF?
LTC2389ILX-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2389ILX-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 LTC2389ILX-18#PBF?
For technical support, including LTC2389ILX-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2389ILX-18#PBF requirements.
6.How does Aetrix verify that LTC2389ILX-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2389ILX-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 LTC2389ILX-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2389ILX-18#PBF?
All LTC2389ILX-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2389ILX-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 LTC2389ILX-18#PBF part is unused and in its original packaging.
Return procedure for LTC2389ILX-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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