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Analog Devices Inc. LTC2344HUH-18#PBF
- Part No.:
- LTC2344HUH-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC2344HUH-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,240
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Product details
Overview
LTC2344HUH-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, quad-channel simultaneous-sampling SAR ADC with differential SoftSpan inputs, ±4LSB INL, 95dB SNR, and rail-to-rail input overdrive tolerance - designed for high-precision industrial data acquisition at 400ksps per channel across all four channels.
For engineers reviewing the LTC2344HUH-18#PBF datasheet, LTC2344HUH-18#PBF pinout, LTC2344HUH-18#PBF application, or LTC2344HUH-18#PBF equivalent, key selection criteria include guaranteed no-missing-codes operation at 18 bits, programmable per-channel input ranges (±4.096V/0–4.096V/±2.048V/0–2.048V), 102dB CMRR, LVDS/CMOS dual-interface support, and H-grade operation up to 125°C.
Technical Context
The LTC2344HUH-18#PBF implements a successive approximation register architecture with internal conversion clock and zero-cycle latency. Its analog front-end features fully differential inputs with 0V to VDD common-mode range and 102dB CMRR at 200Hz, enabling direct digitization of sensor, transducer, and isolated amplifier outputs without external signal conditioning.
Each channel supports independent SoftSpan configuration via SPI register writes, allowing real-time reconfiguration between bipolar and unipolar full-scale ranges on a per-conversion basis. The integrated 4.096V reference buffer (REFBUF) and bandgap reference (REFIN) are internally trimmed and temperature-compensated, delivering ±2.5ppm/°C full-scale drift and 5ppm/°C reference TC over –40°C to 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - guarantees monotonic transfer function and no missing codes across full operating temperature range. |
| Sampling Rate | 400ksps per channel (all 4 enabled) - enables synchronized capture of fast transient signals in multi-sensor systems. |
| INL | ±4LSB max (±4.096V range) - ensures accurate end-point linearity critical for closed-loop control calibration. |
| SNR | 95dB typical (fIN = 2kHz) - supports >15.5 effective number of bits (ENOB) in demanding dynamic applications. |
| CMRR | 102dB typical (fIN = 200Hz) - rejects common-mode noise from motor drives, power supplies, and long cable runs. |
| Operating Temp | –40°C to +125°C (H-grade) - qualified for under-hood automotive, downhole oil & gas, and industrial furnace monitoring. |
| Power Dissipation | 81mW typical (CMOS mode, 4 ch @ 400ksps) - enables high-density data acquisition without forced air cooling. |
Pinout & Package
32-lead (5mm × 5mm) plastic QFN package (UH) with exposed thermal pad (Pin 33 = GND). All GND pins (Pins 9, 11, 20, 29, 31, 32, 33) must be soldered to a solid ground plane for optimal noise immunity and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN0+ / IN0– to IN3+ / IN3– (Pins 1–8) | Differential analog inputs (Ch 0–3) | Simultaneously sampled; support 0V–VDD common-mode range and ±VREFBUF differential swing - eliminates need for external level-shifting amplifiers. |
| REFIN (Pin 10) | Bandgap reference output / buffer input | Nominally 2.048V; can be overdriven with 1.25–2.2V external reference to improve accuracy or temperature stability. |
| REFBUF (Pin 12) | Reference buffer output | Nominally 4.096V (2×REFIN); bypassed with 47μF ceramic capacitor; disable by grounding REFIN to use external 2.5–5V reference. |
| LVDS/CMOS (Pin 14) | I/O interface mode select | Tie to OVDD for LVDS; tie to GND for CMOS - configures digital interface before power-up; no runtime switching. |
| PD (Pin 13) | Power-down control | Active-high; initiates low-power state (<0.33mW) and global reset on double assertion - enables energy-efficient burst-mode acquisition. |
| CS / CNV / BUSY / SDOx / SCKI / SCKO (Pins 15–32) | Serial interface control & data | Supports 1–4-lane CMOS (1.8–5V) or differential LVDS; SCKI/SCKO timing allows >100MHz CMOS or >250MHz LVDS data rates. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel SoftSpan configuration | Independent selection of ±4.096V, 0–4.096V, ±2.048V, or 0–2.048V range per conversion - enables mixed-signal acquisition (e.g., voltage + current + thermocouple) on single device. |
| Rail-to-rail input overdrive tolerance | Accepts differential input overvoltage up to ±VDD without damage or code corruption - protects against sensor fault conditions and ESD transients. |
| Integrated reference & buffer | Factory-trimmed 2.048V bandgap (REFIN) and 4.096V buffer (REFBUF) with 5ppm/°C TC - eliminates external reference IC and reduces BOM count by 2–3 components. |
| Simultaneous sampling & channel disabling | True 4-channel sync capture with optional channel disable - increases throughput to 500ksps (3 ch), 666ksps (2 ch), or 1000ksps (1 ch) without hardware change. |
| H-grade temperature qualification | Guaranteed operation from –40°C to +125°C with full parametric specs - validated for harsh-environment deployment without derating. |
Applications
| Programmable Logic Controllers | Industrial Process Control |
|---|---|
Use Scenario: High-speed analog I/O module acquiring voltage, current, and RTD signals from distributed field sensors in factory automation. IC Role / Device Role / Timing Role: Simultaneous 4-channel ADC capturing synchronized process variables with <150ps aperture matching to eliminate phase skew in feedback loops. Use Value: Eliminates need for external multiplexers and sample-and-hold circuits, reducing system latency and component count while maintaining 18-bit integrity across temperature. | Use Scenario: Distributed control system monitoring pressure, flow, and temperature in chemical plant reactors with stringent safety integrity requirements. IC Role / Device Role / Timing Role: Precision digitizer with ±4LSB INL and 102dB CMRR rejecting 50/60Hz mains noise from long sensor cables in electrically noisy environments. Use Value: Enables direct connection to 4–20mA transmitters and thermocouples without signal conditioning, improving measurement fidelity and reducing calibration drift. |
| Medical Imaging | High Speed Data Acquisition |
Use Scenario: Ultrasound beamformer front-end digitizing echo return signals from phased-array transducers with precise time-of-flight resolution. IC Role / Device Role / Timing Role: Low-jitter (3ps RMS) SAR ADC providing 95dB SNR and 115dB SFDR for high-fidelity RF envelope detection and Doppler processing. Use Value: Supports >15.5 ENOB at 2kHz, enabling sub-millimeter spatial resolution in portable ultrasound devices without oversampling or digital filtering overhead. | Use Scenario: Modular test equipment capturing transient waveforms from power electronics, motor drives, and RF amplifiers during validation and compliance testing. IC Role / Device Role / Timing Role: Quad-channel simultaneous sampler with 400ksps/channel and LVDS interface delivering deterministic timing for multi-channel oscilloscope and spectrum analyzer functions. Use Value: Provides synchronized acquisition across voltage, current, and auxiliary sensor channels - essential for loss analysis, harmonic distortion measurement, and EMI pre-compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7606C-18 | 18-bit, 8-channel, 1MSPS, parallel/serial interface; internal reference only (no REFBUF overdrive option); 100dB CMRR; 85°C max operating temp. | Higher channel count but lower CMRR and no H-grade option - better suited for benchtop DAQ than embedded harsh-environment systems. | Select AD7606C-18 when needing >4 channels or higher throughput; choose LTC2344HUH-18#PBF for 125°C operation, superior CMRR, and flexible reference configuration. |
| ADS8684 | 18-bit, 4-channel, 500ksps, SPI-only CMOS interface; integrated PGA (±10.24V range); no LVDS; 92dB SNR; 85°C max operating temp. | Includes programmable gain amplifier but lacks simultaneous sampling integrity and LVDS noise immunity - optimized for cost-sensitive industrial I/O, not precision metrology. | Select ADS8684 when signal conditioning (gain/level shift) is required on-chip; choose LTC2344HUH-18#PBF when preserving analog signal integrity and supporting extreme temperature operation are primary concerns. |
Compared with AD7606C-18 and ADS8684, the LTC2344HUH-18#PBF uniquely combines H-grade temperature rating, LVDS interface for noise immunity, per-channel SoftSpan flexibility, and 102dB CMRR - making it the only option qualified for simultaneous high-accuracy acquisition in thermally aggressive, electrically hostile environments.
Availability
LTC2344HUH-18#PBF is available at Aetrix Electronics and suitable for programmable logic controllers, industrial process control systems, and medical imaging equipment requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC2344HUH-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 LTC2344-18 product line was engineered for high-accuracy, multi-channel data acquisition in thermally demanding and electrically noisy environments - emphasizing simultaneous sampling integrity, reference flexibility, and robustness beyond commercial-grade specifications.
FAQ
What is the maximum sampling rate per channel for the LTC2344HUH-18#PBF when all four channels are enabled?
The LTC2344HUH-18#PBF achieves 400ksps per channel with all four channels simultaneously enabled. This is its rated full-bandwidth operation mode, supported by internal timing architecture and guaranteed across the –40°C to +125°C temperature range. Higher rates (500ksps, 666ksps, 1000ksps) are achievable only when fewer channels are active.
Does the LTC2344HUH-18#PBF support both LVDS and CMOS digital interfaces, and how is the mode selected?
Yes, the LTC2344HUH-18#PBF supports both LVDS and CMOS serial interfaces. Mode selection is controlled by the LVDS/CMOS pin (Pin 14): tie to OVDD for LVDS operation, tie to GND for CMOS. This is a hardware-configured setting - no software register write is required, and the mode is latched at power-up.
Can the LTC2344HUH-18#PBF operate with an external reference, and what are the valid voltage ranges?
Yes, the LTC2344HUH-18#PBF supports two external reference configurations: (1) Overdrive REFIN with 1.25V–2.2V for improved accuracy over the internal bandgap; or (2) Disable the internal buffer and overdrive REFBUF directly with 2.5V–5V. Both methods retain full 18-bit performance and temperature specifications.
What is the guaranteed integral nonlinearity (INL) specification for the LTC2344HUH-18#PBF across its full operating temperature range?
The LTC2344HUH-18#PBF guarantees ±4LSB maximum INL over the full –40°C to +125°C operating range when configured for the ±4.096V SoftSpan range. This specification is tested and guaranteed - not just typical - ensuring consistent linearity in high-reliability applications without derating.
How does the LTC2344HUH-18#PBF handle input common-mode voltage, and what is its common-mode rejection ratio?
The LTC2344HUH-18#PBF accepts analog input common-mode voltages from 0V to VDD (5V), enabling direct interfacing with sensors and amplifiers operating at rail-to-rail levels. Its analog inputs deliver 102dB typical CMRR at 200Hz, measured across all channels, which suppresses noise coupled equally onto both IN+ and IN– inputs - critical for long-cable industrial installations.
LTC2344HUH-18#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- SoftSpan™
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 400k
- Number of Inputs:
- 4
- Input Type:
- Differential
- Data Interface:
- LVDS - Serial, SPI
- Configuration:
- S/H-MUX-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 4
- 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:
- 32-QFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2344HUH-18#PBF FAQ
1.How can I place an order for LTC2344HUH-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2344HUH-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 LTC2344HUH-18#PBF reliable?
The price and inventory of LTC2344HUH-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 LTC2344HUH-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2344HUH-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2344HUH-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2344HUH-18#PBF?
LTC2344HUH-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2344HUH-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 LTC2344HUH-18#PBF?
For technical support, including LTC2344HUH-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2344HUH-18#PBF requirements.
6.How does Aetrix verify that LTC2344HUH-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2344HUH-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 LTC2344HUH-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2344HUH-18#PBF?
All LTC2344HUH-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2344HUH-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 LTC2344HUH-18#PBF part is unused and in its original packaging.
Return procedure for LTC2344HUH-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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