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

Analog Devices Inc. LTC2345HUK-18#PBF

Name: LTC2345HUK-18#PBF
Brand: Analog Devices Inc.
SKU: LTC2345HUK-18#PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LTC2345HUK-18#PBF

Manufacturer:: Analog Devices Inc.

Category:: Analog to Digital Converters (ADC)

Package:: 48-WFQFN Exposed Pad

Datasheet:: LTC2345HUK-18#PBF.pdf

Description:: IC ADC 18BIT SAR 48QFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

LTC2345HUK-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, octal-channel simultaneous-sampling SAR ADC with differential SoftSpan™ inputs, ±5 LSB INL (±4.096V range), 91.8 dB SNR, and rail-to-rail input overdrive tolerance. It operates at 200 ksps per channel with integrated 4.096 V reference buffer and supports CMOS (1.8–5 V) or LVDS serial interfaces - ideal for high-precision industrial data acquisition systems requiring wide dynamic range and multi-channel synchronization.

For engineers reviewing the LTC2345HUK-18#PBF datasheet, LTC2345HUK-18#PBF pinout, LTC2345HUK-18#PBF application, or LTC2345HUK-18#PBF equivalent, this device delivers verified 18-bit no-missing-codes performance, per-channel programmable input ranges (±4.096 V, 0–4.096 V, ±2.048 V, 0–2.048 V), 102 dB CMRR, and guaranteed operation up to +125°C in a 48-lead QFN package.

Technical Context

The LTC2345HUK-18#PBF implements a successive approximation register architecture with internal conversion clock and zero-cycle latency. Its SoftSpan™ configuration enables independent per-channel input range selection on a conversion-by-conversion basis, supporting both bipolar and unipolar differential signals across a 0 V to VDD common-mode range.

It features dual-mode digital I/O: SPI-compatible CMOS (1.8–5 V OVDD) with configurable 1–8 data lanes, or differential LVDS with 275–425 mV output swing and 100 Ω termination. The integrated reference buffer delivers 4.096 V (±5 mV) with 5 ppm/°C tempco and supports external overdrive via REFIN (1.25–2.2 V).

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	18-bit - guarantees monotonic transfer function and no missing codes across full temperature range (−40°C to +125°C).
Sampling Rate	200 ksps per channel (8-channel simultaneous sampling) - enables real-time capture of fast transients in multi-sensor systems.
INL (Max)	±5 LSB at ±4.096 V range - ensures <0.002% full-scale linearity error for precision metrology applications.
SNR (Typ)	91.8 dB at f_IN = 2 kHz - corresponds to effective resolution >15.0 ENOB under typical conditions.
CMRR (Typ)	102 dB at f_IN = 200 Hz - rejects common-mode noise from motor drives or industrial power supplies.
Power Dissipation	81 mW (CMOS mode, 200 ksps, 8 channels) - enables thermally constrained designs without forced cooling.
Operating Temp	−40°C to +125°C - qualified for harsh environments including downhole oil/gas, engine control, and avionics subsystems.

Pinout & Package

Package: 48-lead (7 mm × 7 mm) plastic QFN with exposed pad (Pin 49 = GND). RoHS-compliant, lead-free finish (#PBF).

Pin/Terminal	Circuit Role	Design Meaning
IN0+ to IN7+, IN0− to IN7− (Pins 1–14, 47–48)	Differential analog inputs	Simultaneously sampled inputs with 0 V to VDD common-mode range; support ±4.096 V, 0–4.096 V, ±2.048 V, or 0–2.048 V SoftSpan ranges per channel.
REFIN (Pin 19)	Bandgap reference output / external reference input	Outputs 2.048 V nominal bandgap voltage; accepts 1.25–2.2 V external reference to improve accuracy or drift performance.
REFBUF (Pin 21)	Internal reference buffer output	Provides 4.096 V (±5 mV) buffered master reference; requires 47 µF bulk + 0.1 µF ceramic bypass for stability.
CS, SCKI, SDI, SDO0–SDO7, SCKO (Pins 22–39)	Serial interface I/O	Configurable CMOS (1.8–5 V) or LVDS interface; supports 1–8 data lanes for throughput optimization and layout flexibility.
CNV (Pin 40)	Conversion start trigger	Edge-triggered command initiating simultaneous sampling across all enabled channels; minimum 40 ns high pulse width required.
PD (Pin 24)	Power-down control	Active-high signal reducing supply current to ≤0.33 mW; wake-up time ≤200 ms due to REFBUF re-stabilization.

Key Features

Feature	Design Value
Per-channel SoftSpan™ configuration	Independent selection of ±4.096 V, 0–4.096 V, ±2.048 V, or 0–2.048 V input range on every conversion - eliminates external gain-switching circuitry.
Rail-to-rail input overdrive tolerance	Accepts differential input voltages from −VDD to +VDD without damage or conversion corruption - simplifies front-end protection design.
102 dB CMRR at 200 Hz	Rejects common-mode interference from noisy industrial buses or shared ground paths - reduces need for isolated signal conditioning.
Guaranteed 18-bit no-missing-codes	Validated across full operating temperature range (−40°C to +125°C) - ensures reliable code coverage in safety-critical monitoring.
Internal conversion clock, zero-latency	No external clock required; deterministic timing eliminates jitter sources and simplifies system-level synchronization.

Applications

Programmable Logic Controllers	Industrial Process Control
Use Scenario: High-density analog input modules acquiring voltage/current signals from multiple field sensors (e.g., 4–20 mA transmitters, RTDs, strain gauges) in factory automation cabinets. IC Role / Device Role / Timing Role: Simultaneous sampling ADC capturing synchronized snapshots across 8 channels to eliminate phase skew in closed-loop feedback control. Use Value: ±5 LSB INL and 91.8 dB SNR enable sub-0.01% measurement accuracy over temperature, critical for PID tuning and regulatory compliance (e.g., ISA-84).	Use Scenario: Distributed control system (DCS) I/O cards digitizing pressure, flow, and temperature signals from refinery pipelines and reactors. IC Role / Device Role / Timing Role: Precision ADC with 102 dB CMRR rejecting common-mode noise from 60 Hz AC mains and variable-frequency drives near sensor wiring. Use Value: Guaranteed operation to +125°C allows direct mounting in hot junction boxes, eliminating remote signal conditioning and reducing calibration drift.
Medical Imaging Subsystems	High-Speed Data Acquisition
Use Scenario: Ultrasound beamformer front-end digitizing echo return signals from phased-array transducers in portable imaging devices. IC Role / Device Role / Timing Role: Low-noise, low-latency SAR ADC providing synchronized 18-bit samples across multiple receive channels for digital beamforming. Use Value: 200 ksps per channel with zero-cycle latency enables real-time processing of RF envelope data without FIFO buffering delays.	Use Scenario: Modular test equipment capturing transient waveforms from power electronics (e.g., inverter switching, fault events) in R&D labs and production test stands. IC Role / Device Role / Timing Role: Multi-channel ADC with configurable CMOS/LVDS interface enabling flexible integration into FPGA-based acquisition platforms with scalable bandwidth. Use Value: Pin-selectable LVDS mode supports >100 MHz data rates over controlled-impedance traces, reducing EMI vs parallel CMOS bus in dense PCB layouts.

Programmable Logic Controllers

Industrial Process Control

Use Scenario: High-density analog input modules acquiring voltage/current signals from multiple field sensors (e.g., 4–20 mA transmitters, RTDs, strain gauges) in factory automation cabinets.

IC Role / Device Role / Timing Role: Simultaneous sampling ADC capturing synchronized snapshots across 8 channels to eliminate phase skew in closed-loop feedback control.

Use Value: ±5 LSB INL and 91.8 dB SNR enable sub-0.01% measurement accuracy over temperature, critical for PID tuning and regulatory compliance (e.g., ISA-84).

Use Scenario: Distributed control system (DCS) I/O cards digitizing pressure, flow, and temperature signals from refinery pipelines and reactors.

IC Role / Device Role / Timing Role: Precision ADC with 102 dB CMRR rejecting common-mode noise from 60 Hz AC mains and variable-frequency drives near sensor wiring.

Use Value: Guaranteed operation to +125°C allows direct mounting in hot junction boxes, eliminating remote signal conditioning and reducing calibration drift.

Medical Imaging Subsystems

High-Speed Data Acquisition

Use Scenario: Ultrasound beamformer front-end digitizing echo return signals from phased-array transducers in portable imaging devices.

IC Role / Device Role / Timing Role: Low-noise, low-latency SAR ADC providing synchronized 18-bit samples across multiple receive channels for digital beamforming.

Use Value: 200 ksps per channel with zero-cycle latency enables real-time processing of RF envelope data without FIFO buffering delays.

Use Scenario: Modular test equipment capturing transient waveforms from power electronics (e.g., inverter switching, fault events) in R&D labs and production test stands.

IC Role / Device Role / Timing Role: Multi-channel ADC with configurable CMOS/LVDS interface enabling flexible integration into FPGA-based acquisition platforms with scalable bandwidth.

Use Value: Pin-selectable LVDS mode supports >100 MHz data rates over controlled-impedance traces, reducing EMI vs parallel CMOS bus in dense PCB layouts.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-resolution multi-channel ADC applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AD7606C-18	18-bit, 8-channel, simultaneous sampling; ±2.5 LSB INL (±10 V range); uses external reference; LVDS not supported.	Requires external 2.5 V reference and level-shifting for 5 V systems; lower CMRR (96 dB) limits noise rejection in electrically noisy plants.	Preferred when external reference control or lower cost is prioritized over integrated reference simplicity and ultra-high CMRR.
ADS8688	16-bit, 8-channel, pseudo-simultaneous sampling; ±1.5 LSB INL (±10.24 V range); integrated reference; SPI-only CMOS interface.	Lacks true simultaneous sampling - introduces inter-channel skew up to 250 ns; lower resolution limits dynamic range in vibration analysis.	Suitable for cost-sensitive applications where 16-bit resolution and sequential sampling are acceptable, such as basic SCADA telemetry.

Compared with AD7606C-18 and ADS8688, the LTC2345HUK-18#PBF uniquely combines integrated 4.096 V reference buffer, 102 dB CMRR, true simultaneous sampling, and LVDS capability - delivering superior noise immunity, timing integrity, and system-level integration for demanding industrial and medical instrumentation.

Availability

LTC2345HUK-18#PBF is available at Aetrix Electronics and suitable for industrial process control, programmable logic controllers, and high-speed data acquisition requiring stable component supply across extended temperature and long product lifecycles.

Supply support for LTC2345HUK-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 semiconductors for precision measurement and control.

The LTC2345 family was designed for high-accuracy, multi-channel data acquisition in harsh industrial and medical environments - emphasizing simultaneous sampling integrity, wide common-mode rejection, and extended temperature reliability.

FAQ

What is the maximum sampling rate per channel for the LTC2345HUK-18#PBF?

The LTC2345HUK-18#PBF achieves 200 ksps per channel when all eight channels are enabled. Throughput increases to 1000 ksps per channel when only one channel is active, with linear scaling between - enabling flexible trade-offs between channel count and speed in real-time systems.

Does the LTC2345HUK-18#PBF require an external reference?

No - the LTC2345HUK-18#PBF integrates a precision 4.096 V reference buffer (REFBUF) and 2.048 V bandgap reference (REFIN). External overdrive of REFIN (1.25–2.2 V) is optional for improved accuracy or temperature stability, but not required for standard operation.

How does the SoftSpan™ feature work on the LTC2345HUK-18#PBF?

SoftSpan™ allows each of the eight channels to be independently configured on a per-conversion basis for ±4.096 V, 0–4.096 V, ±2.048 V, or 0–2.048 V input ranges using SPI register writes - eliminating external programmable gain amplifiers and enabling adaptive signal conditioning in software-defined instruments.

What is the operating temperature range of the LTC2345HUK-18#PBF?

The LTC2345HUK-18#PBF is rated for −40°C to +125°C operation (H-grade), with all key specifications - including ±5 LSB INL, 91.8 dB SNR, and 102 dB CMRR - guaranteed across this full range. This qualifies it for under-hood automotive, downhole, and industrial edge computing deployments.

Can the LTC2345HUK-18#PBF interface directly with an FPGA using LVDS?

Yes - the LTC2345HUK-18#PBF supports pin-selectable LVDS serial I/O with 275–425 mV differential output swing and 100 Ω termination, compatible with standard FPGA LVDS receivers. Timing parameters (e.g., tSKEW ≤ ±0.4 ns) ensure robust setup/hold margins at >100 MHz data rates.

LTC2345HUK-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 ~ 125°C

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

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

LTC2345HUK-18#PBF FAQ

1.How can I place an order for LTC2345HUK-18#PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC2345HUK-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 LTC2345HUK-18#PBF reliable?

The price and inventory of LTC2345HUK-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 LTC2345HUK-18#PBF is usually 5 days.

3.What payment methods are accepted for LTC2345HUK-18#PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2345HUK-18#PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC2345HUK-18#PBF?

LTC2345HUK-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC2345HUK-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 LTC2345HUK-18#PBF?

For technical support, including LTC2345HUK-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2345HUK-18#PBF requirements.

6.How does Aetrix verify that LTC2345HUK-18#PBF is sourced from the original manufacturer or authorized distributors?

All LTC2345HUK-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 LTC2345HUK-18#PBF meets industry standards.

7.What is the process for return or replacement of LTC2345HUK-18#PBF?

All LTC2345HUK-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2345HUK-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 LTC2345HUK-18#PBF part is unused and in its original packaging.

Return procedure for LTC2345HUK-18#PBF:

1.Submit a request within 90 days.

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

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