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Home > Products > Integrated Circuits (ICs) > Data Acquisition > Analog to Digital Converters (ADC)

Analog Devices Inc. LTC2345IUK-18#PBF

Name: LTC2345IUK-18#PBF
Brand: Analog Devices Inc.
SKU: LTC2345IUK-18#PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LTC2345IUK-18#PBF

Manufacturer:: Analog Devices Inc.

Category:: Analog to Digital Converters (ADC)

Package:: 48-WFQFN Exposed Pad

Datasheet:: LTC2345IUK-18#PBF.pdf

Description:: IC ADC 18BIT SAR 48QFN

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Product details

Overview

LTC2345IUK-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, octal-channel simultaneous-sampling SAR ADC with differential wide common-mode inputs, ±5LSB INL (±4.096V range), 91.8dB SNR, and 200ksps per channel throughput. It features per-channel SoftSpan™ configurable input ranges (±4.096V, 0–4.096V, ±2.048V, 0–2.048V), integrated 4.096V reference buffer, and operates from a single 5V supply across –40°C to +85°C. It is used in high-precision industrial data acquisition systems requiring multichannel synchronization and rail-to-rail input overdrive tolerance.

For engineers reviewing the LTC2345IUK-18#PBF datasheet, LTC2345IUK-18#PBF pinout, LTC2345IUK-18#PBF application, or LTC2345IUK-18#PBF equivalent, key selection criteria include guaranteed 18-bit no-missing-codes performance, 102dB CMRR at 200Hz, LVDS/CMOS dual serial interface support, 48-lead QFN package thermal performance, and per-channel programmable input range flexibility for mixed-signal sensor conditioning.

Technical Context

The LTC2345IUK-18#PBF implements a successive approximation register (SAR) architecture with internal conversion clock and zero-cycle latency, enabling deterministic timing for real-time control loops. Its analog front-end supports fully differential, arbitrary, bipolar, or unipolar drive modes with rail-to-rail input overdrive tolerance and 31MHz –3dB input bandwidth.

It integrates a precision 2.048V bandgap reference (REFIN) and a buffered 4.096V output (REFBUF), with programmable reference enable/disable and external overdrive capability. Digital I/O supports both SPI CMOS (1.8V–5V) and LVDS interfaces, with selectable lane count (1–8) in CMOS mode to balance throughput and bus width.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	18-bit - guarantees full dynamic range without missing codes across all channels and SoftSpan ranges.
Sampling Rate	200ksps per channel (8-channel simultaneous) - enables synchronized capture of fast transients in multi-sensor systems.
INL (Max)	±5 LSB (±4.096V range) - ensures <0.002% end-point linearity error for calibration-critical instrumentation.
SNR (Typ)	91.8dB - delivers >15 effective bits (ENOB ≈ 15.0) at 2kHz input, critical for low-noise medical imaging front-ends.
CMRR (Typ)	102dB at 200Hz - rejects common-mode noise from motor drives or long cable runs in PLC analog input modules.
Power Dissipation	81mW (CMOS mode, 8 channels) - enables thermally constrained designs in dense industrial I/O cards.
Operating Temp	–40°C to +85°C - qualified for extended-temperature industrial process control environments.
Package	48-lead 7mm × 7mm QFN - provides low thermal resistance (θJA = 34°C/W) and exposed pad for PCB heat sinking.

Pinout & Package

Package: 48-lead plastic QFN (7mm × 7mm), exposed pad (Pin 49) connected to GND and required to be soldered to PCB for thermal and electrical integrity.

Pin/Terminal	Circuit Role	Design Meaning
IN0+ to IN7+, IN0− to IN7− (Pins 1–14, 47–48)	Differential analog inputs (8 channels)	Simultaneously sample VIN+ − VIN−; support 0V to VDD common-mode range and rail-to-rail overdrive tolerance.
GND (Pins 15–18, 20, 30, 41, 44–46, 49)	Analog/digital ground	Multiple dedicated GND pins minimize ground bounce and ensure stable reference and digital return paths.
REFIN (Pin 19)	Internal bandgap reference output / external reference input	Outputs 2.048V nominal; accepts 1.25V–2.2V external reference for improved accuracy or temperature stability.
REFBUF (Pin 21)	Buffered reference output (4.096V)	Provides low-impedance 4.096V master reference; disabled when REFIN is overdriven to avoid conflict.
PD (Pin 22)	Power-down control	Active-high signal reduces current to ≤2.1μA (I-grade), enabling low-power sleep states in portable DAQ.
CNV (Pin 24)	Conversion start trigger	Edge-sensitive input initiates simultaneous sampling across all enabled channels; minimal aperture jitter (3ps RMS).
CS, SCKI, SDI, SDO0–SDO7, SCKO, BUSY (Pins 25–39, 42–43)	Serial interface signals	Supports pin-selectable CMOS (1.8V–5V) or LVDS I/O; up to 8 data lanes configurable for throughput optimization.

Key Features

Feature	Design Value
Per-channel SoftSpan™ configuration	Each of 8 channels independently selects ±4.096V, 0–4.096V, ±2.048V, or 0–2.048V range on every conversion - eliminates external gain-switching circuitry in multi-sensor systems.
Integrated reference and buffer	On-chip 2.048V bandgap + 4.096V buffer reduces BOM count and layout sensitivity while maintaining ±20ppm/°C tempco and 0.1mV/V line regulation.
102dB CMRR at 200Hz	Rejects noise from shared power rails or EMI-coupled interference in factory-floor PLC cabinets without external instrumentation amplifiers.
Rail-to-rail input overdrive tolerance	Withstands ±VDD differential overvoltage without corruption - protects against sensor fault conditions and simplifies front-end protection design.
LVDS/CMOS dual interface	Reduces EMI and improves noise immunity in noisy industrial environments via LVDS, or enables direct FPGA interfacing with CMOS voltage levels (1.8V–5V).
Guaranteed operation to 85°C	Validated performance across full industrial temperature range - eliminates derating concerns in enclosed control panels with limited airflow.

Applications

Programmable Logic Controllers	Industrial Process Control
Use Scenario: High-density analog input modules acquiring voltage/current signals from pressure, temperature, and flow sensors in distributed control systems. IC Role / Device Role / Timing Role: Simultaneous 8-channel sampling digitizes sensor outputs with synchronized timestamps for closed-loop PID execution. Use Value: Eliminates inter-channel skew and enables precise phase correlation between process variables - critical for cascade control and model-predictive algorithms.	Use Scenario: Centralized data acquisition in chemical plant monitoring, where multiple reactor sensors must be sampled synchronously under harsh EMI conditions. IC Role / Device Role / Timing Role: ADC front-end with 102dB CMRR and rail-to-rail overdrive tolerance directly interfaces with 4–20mA transmitters and RTD bridges. Use Value: Reduces need for external signal conditioning and isolation, lowering system cost and board area while maintaining ±0.002% measurement accuracy.
Medical Imaging	High Speed Data Acquisition
Use Scenario: Ultrasound beamformer front-end capturing echo signals from phased-array transducers with low-noise, high-linearity requirements. IC Role / Device Role / Timing Role: 18-bit simultaneous sampling ADC providing >15 ENOB and 91.8dB SNR at 2kHz for time-of-flight calculations. Use Value: Enables finer image resolution and reduced speckle noise without oversampling or post-processing - improving diagnostic confidence.	Use Scenario: Portable oscilloscope or vibration analyzer capturing transient mechanical events across multiple axes using MEMS accelerometers. IC Role / Device Role / Timing Role: Low-latency SAR converter with zero-cycle latency and deterministic tCONV (455×N–35 ns) for real-time triggering and waveform reconstruction. Use Value: Supports burst-mode acquisition at 1Msps (single channel) while retaining full 18-bit resolution - essential for capturing infrequent but critical failure signatures.

Programmable Logic Controllers

Industrial Process Control

Use Scenario: High-density analog input modules acquiring voltage/current signals from pressure, temperature, and flow sensors in distributed control systems.

IC Role / Device Role / Timing Role: Simultaneous 8-channel sampling digitizes sensor outputs with synchronized timestamps for closed-loop PID execution.

Use Value: Eliminates inter-channel skew and enables precise phase correlation between process variables - critical for cascade control and model-predictive algorithms.

Use Scenario: Centralized data acquisition in chemical plant monitoring, where multiple reactor sensors must be sampled synchronously under harsh EMI conditions.

IC Role / Device Role / Timing Role: ADC front-end with 102dB CMRR and rail-to-rail overdrive tolerance directly interfaces with 4–20mA transmitters and RTD bridges.

Use Value: Reduces need for external signal conditioning and isolation, lowering system cost and board area while maintaining ±0.002% measurement accuracy.

Medical Imaging

High Speed Data Acquisition

Use Scenario: Ultrasound beamformer front-end capturing echo signals from phased-array transducers with low-noise, high-linearity requirements.

IC Role / Device Role / Timing Role: 18-bit simultaneous sampling ADC providing >15 ENOB and 91.8dB SNR at 2kHz for time-of-flight calculations.

Use Value: Enables finer image resolution and reduced speckle noise without oversampling or post-processing - improving diagnostic confidence.

Use Scenario: Portable oscilloscope or vibration analyzer capturing transient mechanical events across multiple axes using MEMS accelerometers.

IC Role / Device Role / Timing Role: Low-latency SAR converter with zero-cycle latency and deterministic tCONV (455×N–35 ns) for real-time triggering and waveform reconstruction.

Use Value: Supports burst-mode acquisition at 1Msps (single channel) while retaining full 18-bit resolution - essential for capturing infrequent but critical failure signatures.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 18-bit multichannel SAR ADC applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AD7606C-18	8-channel, 18-bit, 1MSPS, integrated analog front-end with ±10V/±5V/0–10V ranges; uses internal oscillator; requires external reference for best accuracy.	Higher max throughput (1Msps vs 200ksps) but lower SNR (89.5dB vs 91.8dB); less flexible per-channel range selection (group-based, not individual).	Select AD7606C-18 when higher sample rate dominates over SNR and per-channel range independence.
ADS8688	8-channel, 16-bit, 500ksps, integrated PGA (±10.24V to ±125mV ranges), SPI-only CMOS interface; no LVDS option.	Lower resolution (16-bit vs 18-bit) but includes programmable gain amplifier; optimized for direct sensor interfacing without external signal conditioning.	Select ADS8688 when sensor-level gain adjustment is needed and 16-bit resolution suffices for the measurement fidelity target.

Compared with AD7606C-18 and ADS8688, the LTC2345IUK-18#PBF uniquely combines per-channel SoftSpan™ configurability, LVDS interface for noise immunity, and best-in-class 91.8dB SNR - making it optimal for high-fidelity, synchronized multichannel acquisition where range flexibility and dynamic range are prioritized over raw speed or integrated PGA functionality.

Availability

LTC2345IUK-18#PBF is available at Aetrix Electronics and suitable for industrial process control, programmable logic controllers, and medical imaging systems requiring stable component supply, extended temperature qualification (–40°C to +85°C), and long-term production continuity.

Supply support for LTC2345IUK-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, serving industrial, automotive, communications, and healthcare markets.

The LTC2345IUK-18#PBF belongs to Linear's precision SAR ADC product line, designed specifically for demanding multichannel data acquisition applications requiring simultaneous sampling, wide input flexibility, and robust industrial-grade reliability.

FAQ

What is the maximum sampling rate per channel for the LTC2345IUK-18#PBF?

The LTC2345IUK-18#PBF achieves 200ksps per channel when all eight channels are enabled simultaneously. Throughput increases to 1Msps when only one channel is active, with linear scaling (e.g., 450ksps for three channels). This scalability is enabled by its fixed conversion time per channel (tCONV = 455×N – 35 ns) and deterministic timing architecture.

Does the LTC2345IUK-18#PBF require an external reference, or does it have an integrated one?

The LTC2345IUK-18#PBF includes a fully integrated reference system: a 2.048V bandgap reference (REFIN) and a buffered 4.096V output (REFBUF). No external reference is required for standard operation. However, REFIN can be overdriven with an external 1.25V–2.2V reference for improved accuracy or temperature stability, in which case the internal buffer must be disabled.

How does the SoftSpan™ feature work on the LTC2345IUK-18#PBF?

The SoftSpan™ feature on the LTC2345IUK-18#PBF allows each of the eight analog input channels to be independently configured-on a conversion-by-conversion basis-for one of four differential input ranges: ±4.096V, 0–4.096V, ±2.048V, or 0–2.048V. Configuration is controlled via SPI command bits, enabling dynamic adaptation to varying sensor output levels without hardware changes or external gain switching.

What digital interface options does the LTC2345IUK-18#PBF support?

The LTC2345IUK-18#PBF supports two pin-selectable digital interfaces: SPI-compatible CMOS (operating from 1.8V to 5V OVDD) and LVDS. In CMOS mode, the number of SDO data lanes can be configured from one to eight to optimize bus width versus throughput. LVDS mode provides superior noise immunity for high-EMI industrial environments.

Is the LTC2345IUK-18#PBF pin-compatible with other members of the LTC2345 family?

Yes, the LTC2345IUK-18#PBF is pin-compatible with the LTC2345CUK-18#PBF (0°C to 70°C) and LTC2345HUK-18#PBF (–40°C to 125°C), sharing identical 48-lead QFN packaging, pinout, and electrical interface. Only the operating temperature grade differs - allowing drop-in replacement based on environmental requirements without PCB redesign.

LTC2345IUK-18#PBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: SoftSpan™

Package/Case:: 48-WFQFN Exposed Pad

Packaging:: Tube

Product Status:: Active

Number of Bits:: 18

Sampling Rate (Per Second):: 200k

Number of Inputs:: 8

Input Type:: Differential

Data Interface:: LVDS - Serial, SPI

Configuration:: S/H-MUX-ADC

Ratio - S/H:ADC:: 8:1

Number of A/D Converters:: 1

Architecture:: SAR

Reference Type:: External, Internal

Voltage - Supply, Analog:: 5V

Voltage - Supply, Digital:: 5V

Features:: Simultaneous Sampling

Operating Temperature:: -40°C ~ 85°C

Supplier Device Package:: 48-QFN (7x7)

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

LTC2345IUK-18#PBF FAQ

1.How can I place an order for LTC2345IUK-18#PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC2345IUK-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 LTC2345IUK-18#PBF reliable?

The price and inventory of LTC2345IUK-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 LTC2345IUK-18#PBF is usually 5 days.

3.What payment methods are accepted for LTC2345IUK-18#PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2345IUK-18#PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC2345IUK-18#PBF?

LTC2345IUK-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC2345IUK-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 LTC2345IUK-18#PBF?

For technical support, including LTC2345IUK-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2345IUK-18#PBF requirements.

6.How does Aetrix verify that LTC2345IUK-18#PBF is sourced from the original manufacturer or authorized distributors?

All LTC2345IUK-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 LTC2345IUK-18#PBF meets industry standards.

7.What is the process for return or replacement of LTC2345IUK-18#PBF?

All LTC2345IUK-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2345IUK-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 LTC2345IUK-18#PBF part is unused and in its original packaging.

Return procedure for LTC2345IUK-18#PBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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