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Analog Devices Inc. LTC2389CUK-18#PBF
- Part No.:
- LTC2389CUK-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC2389CUK-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,495
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Product details
Overview
LTC2389CUK-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 medical imaging and precision instrumentation.
For engineers reviewing the LTC2389CUK-18#PBF datasheet, LTC2389CUK-18#PBF pinout, LTC2389CUK-18#PBF application, or LTC2389CUK-18#PBF equivalent, this page delivers verified specifications, package mapping, interface modes (parallel/serial), thermal performance to 70°C, and real-world design implications for signal chain integration without external level-shifting.
Technical Context
The LTC2389CUK-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 output bus width (18-/16-/8-bit parallel or serial) and OB/2C+PD/FD pins jointly select both analog input range and output coding 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 device guarantees 18-bit no-missing-codes operation and achieves ±3LSB INL max across all input configurations, with THD as low as –116dB (fully differential, fIN = 2kHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - Guarantees monotonic transfer function and no missing codes over full temperature range. |
| Sampling Rate | 2.5Msps - Enables real-time capture of signals up to 1.25MHz (Nyquist), suitable for ultrasound and ATE applications. |
| SNR (fully diff) | 99.8dB typical at fIN = 2kHz - Delivers >16.5 effective number of bits (ENOB) for ultra-low-noise measurement systems. |
| INL (max) | ±3LSB - Ensures accurate end-point linearity critical for calibration-sensitive instrumentation and process control. |
| Reference | Internal 4.096V ±20ppm/°C - Eliminates external reference component count and board space; stable enough for 0.001% full-scale accuracy over 0°C–70°C. |
| Power Dissipation | 162.5mW at 2.5Msps - Enables high-speed operation without forced cooling in compact enclosures. |
| Supply Voltage | VDD = 4.75V–5.25V; OVDD = 1.71V–5.25V - Supports mixed-signal SoC interfacing and legacy 5V logic compatibility. |
Pinout & Package
48-pin 7mm × 7mm plastic QFN package (UK grade), exposed pad (Pin 49) soldered to PCB ground plane for thermal and electrical integrity. Pin pitch: 0.5mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,17,20,35,41,44,48 + Exposed Pad 49) | Ground reference | Multiple dedicated GND pins and exposed pad ensure low-impedance return path for analog/digital sections and thermal dissipation. |
| VDD (Pins 2,3,19,40,45,46,47) | Analog core supply | Seven VDD pins require local 0.1µF + 10µF ceramic decoupling per group to suppress switching noise and maintain PSRR. |
| MODE0/MODE1 (Pins 4,5) | Interface configuration | Selects 18-bit/16-bit/8-bit parallel or serial output mode; unused outputs go Hi-Z to prevent bus contention. |
| OB/2C & PD/FD (Pins 6,30) | Input range & coding control | Jointly define analog input span (±4.096V/0–4.096V/±2.048V) and output format (offset binary/two's complement) without external logic. |
| IN+, IN– (Pins 42,43) | Differential analog inputs | Accept fully differential signals up to ±4.096V; common-mode range fixed at VREF/2 = 2.048V in fully diff mode. |
| REFOUT/REFIN/REFSENSE (Pins 47,46,39) | Reference interface | REFOUT provides buffered 4.096V; REFIN accepts external reference; REFSENSE enables ratiometric measurement with external sensors. |
| CS/CNVST/BUSY/PD/RESET (Pins 37,36,31,32,33) | Control & status | Standard SPI-like handshaking: CNVST initiates conversion, BUSY indicates active conversion, CS enables serial interface, PD enters low-power state. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-configurable input range | Eliminates need for external gain/level-shift circuitry when interfacing with diverse sensor outputs (e.g., ±10V industrial transducers or 0–5V medical amplifiers). |
| No pipeline delay | Enables immediate readout after BUSY deassertion-critical for closed-loop control where latency must be bounded and predictable. |
| Internal reference with buffer | Reduces BOM count by one precision reference IC and associated passive components; buffer drives ADC reference input directly without external op-amp. |
| 1.8V–5V I/O compatibility | Allows direct connection to 1.8V FPGA banks or 3.3V microcontrollers without level translators, simplifying PCB routing and power domain management. |
| 70°C operating temperature | Validated for commercial-grade embedded systems including portable test equipment and factory-floor data loggers without derating. |
Applications
| Medical Ultrasound Imaging | High-Speed ATE Systems |
|---|---|
Use Scenario: Digitizing RF echo signals from phased-array transducers at multi-MHz rates for beamforming and image reconstruction. IC Role / Device Role / Timing Role: Primary SAR ADC capturing baseband or IF samples with minimal aperture jitter (1ps RMS) and no latency-induced phase error. Use Value: 99.8dB SNR preserves weak echo detail; 2.5Msps throughput supports real-time B-mode frame rates; internal reference ensures consistent gain calibration across units. | Use Scenario: High-accuracy parametric testing of analog ICs and RF components requiring precise stimulus-response characterization. IC Role / Device Role / Timing Role: Precision digitizer in automated test head, synchronized to pattern generator via CNVST for deterministic sampling windows. Use Value: ±3LSB INL enables sub-0.001% absolute accuracy; 18-bit resolution resolves small parametric drifts; serial mode allows daisy-chained multi-channel acquisition. |
| Industrial Process Monitoring | Portable Precision Instrumentation |
Use Scenario: Continuous monitoring of high-resolution sensor outputs (e.g., strain gauges, RTDs, LVDTs) in PLC analog input modules. IC Role / Device Role / Timing Role: Signal chain front-end ADC supporting multiple input ranges (bipolar/unipolar) to accommodate diverse field transmitters without hardware reconfiguration. Use Value: Pin-selectable ±2.048V/0–4.096V ranges match standard 4–20mA loop receivers and thermocouple amps; 162.5mW power enables fanless enclosure design. | Use Scenario: Battery-powered handheld multimeters and spectrum analyzers requiring high dynamic range in compact form factor. IC Role / Device Role / Timing Role: Core ADC in portable instrument, leveraging nap/sleep modes to extend battery life between measurements. Use Value: Power-down current <250µA extends operational time; 7mm × 7mm QFN minimizes PCB area; internal reference removes need for external trimming potentiometers. |
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, 1Msps, internal reference (2.5V), SPI-only interface, no pin-configurable input range | Limited to unipolar 0–2.5V input; requires external signal conditioning for bipolar or higher-voltage sources | Select when lower throughput suffices and system uses only SPI; avoid if ±4.096V differential input or parallel interface needed. |
| ADS8860IPWR | 16-bit, 1Msps, external reference only, SPI interface, no internal oscillator | Requires external clock and reference; lacks pin-selectable ranges and integrated buffer | Choose for cost-sensitive designs where 16-bit resolution meets spec and external timing/reference infrastructure already exists. |
Compared with AD7986BCPZ-RL7 and ADS8860IPWR, the LTC2389CUK-18#PBF uniquely combines 2.5Msps speed, 18-bit resolution, pin-configurable input spans, and internal reference in a single QFN package-reducing signal chain complexity and layout risk in demanding data acquisition systems.
Availability
LTC2389CUK-18#PBF is available at Aetrix Electronics and suitable for medical imaging, automated test equipment, and industrial process control requiring stable component supply, long-term manufacturability, and guaranteed commercial-temperature performance.
Supply support for LTC2389CUK-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 family was designed for high-speed, high-accuracy data acquisition systems demanding low noise, deterministic latency, and flexible analog interface options-targeting applications where precision and timing integrity cannot be compromised.
FAQ
What is the maximum operating temperature for the LTC2389CUK-18#PBF?
The LTC2389CUK-18#PBF is rated for 0°C to 70°C ambient operation (C-grade). Its thermal design-seven VDD pins, eight GND pins, and exposed pad-enables reliable operation at full 2.5Msps throughput within this range without derating. For extended temperature applications, consider the I-grade (–40°C to 85°C) or H-grade (–40°C to 125°C) variants.
Does the LTC2389CUK-18#PBF require an external reference?
No, the LTC2389CUK-18#PBF includes a precision internal 4.096V reference with ±20ppm/°C max temperature coefficient and integrated buffer. External reference use is optional via the REFIN pin and is only necessary when tighter initial accuracy (<0.5%) or custom reference voltage is required. The internal reference eliminates BOM cost and board space for most high-accuracy applications.
How does the MODE0/MODE1 configuration affect the LTC2389CUK-18#PBF's output interface?
The MODE0/MODE1 pins on the LTC2389CUK-18#PBF select among four interface modes: 18-bit parallel (00), 16-bit parallel (01), 8-bit parallel (10), or serial (11). In non-18-bit parallel modes, upper data bits become addressable segments or Hi-Z, reducing pin count requirements. This flexibility allows the same LTC2389CUK-18#PBF to interface with resource-constrained microcontrollers or high-throughput FPGAs without redesign.
Can the LTC2389CUK-18#PBF accept bipolar analog inputs?
Yes-the LTC2389CUK-18#PBF supports ±2.048V pseudo-differential bipolar input range when configured with PD/FD = OVDD and OB/2C = GND. This mode enables direct digitization of AC-coupled sensor outputs (e.g., accelerometers, vibration transducers) without external level-shifting circuitry, preserving signal integrity and reducing component count in the analog front-end.
What is the significance of the exposed pad (Pin 49) on the LTC2389CUK-18#PBF QFN package?
The exposed pad (Pin 49) on the LTC2389CUK-18#PBF is electrically and thermally connected to GND. It must be soldered to a solid PCB ground plane to achieve specified thermal resistance (θJA = 29°C/W) and ensure stable reference and analog performance. Omitting this connection risks increased junction temperature, degraded SNR, and potential long-term reliability issues under continuous 2.5Msps operation.
LTC2389CUK-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:
- 0°C ~ 70°C
- Supplier Device Package:
- 48-QFN (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2389CUK-18#PBF FAQ
1.How can I place an order for LTC2389CUK-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2389CUK-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 LTC2389CUK-18#PBF reliable?
The price and inventory of LTC2389CUK-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 LTC2389CUK-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2389CUK-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2389CUK-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2389CUK-18#PBF?
LTC2389CUK-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2389CUK-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 LTC2389CUK-18#PBF?
For technical support, including LTC2389CUK-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2389CUK-18#PBF requirements.
6.How does Aetrix verify that LTC2389CUK-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2389CUK-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 LTC2389CUK-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2389CUK-18#PBF?
All LTC2389CUK-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2389CUK-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 LTC2389CUK-18#PBF part is unused and in its original packaging.
Return procedure for LTC2389CUK-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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