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Analog Devices Inc. LTC2344CUH-18#PBF
- Part No.:
- LTC2344CUH-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC2344CUH-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:113
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Product details
Overview
LTC2344CUH-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, quad-channel simultaneous-sampling SAR ADC with differential SoftSpan inputs, ±4.096V/0–4.096V configurable ranges per channel, 400ksps/ch throughput, and integrated 4.096V reference buffer. It operates from a 5V supply, delivers 95dB SNR and ±4LSB INL, and targets high-precision industrial data acquisition where channel-to-channel isolation and wide common-mode input flexibility are critical.
For engineers reviewing the LTC2344CUH-18#PBF datasheet, LTC2344CUH-18#PBF pinout, LTC2344CUH-18#PBF application, or LTC2344CUH-18#PBF equivalent, key selection criteria include guaranteed no-missing-codes at 18 bits, 102dB CMRR for noisy sensor interfaces, rail-to-rail input overdrive tolerance, and support for both SPI CMOS (1.8–5V) and LVDS serial interfaces with programmable lane count (1–4).
Technical Context
The LTC2344CUH-18#PBF implements a true simultaneous sampling architecture across four independent SAR cores, each with per-channel SoftSpan configuration enabling real-time range switching (±4.096V, 0–4.096V, ±2.048V, 0–2.048V) on a conversion-by-conversion basis. Its analog front-end features a wide 0V to VDD common-mode input range and 102dB CMRR at 200Hz, allowing direct connection to transducers, RTDs, and isolated amplifiers without external level-shifting.
Digital interface flexibility includes pin-selectable LVDS or CMOS I/O modes, with CMOS supporting 1–4 data lanes for throughput optimization and LVDS enabling noise-immune operation in dense PCB layouts. Internal conversion clock eliminates cycle latency, and power-down mode reduces current to 65µA (C-grade) while maintaining fast wake-up via REFBUF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - guarantees full 1:262,144 dynamic range with no missing codes across all operating conditions. |
| Sampling Rate | 400ksps per channel (4-channel mode) - supports real-time capture of signals up to ~200kHz Nyquist bandwidth. |
| SNR | 95dB typical (±4.096V range, fIN = 2kHz) - enables >15.8 effective bits for low-noise sensor digitization. |
| INL | ±4LSB max (±4.096V range) - ensures monotonicity and accurate end-point linearity in closed-loop control feedback paths. |
| CMRR | 102dB typical at 200Hz - rejects common-mode noise from long cable runs or shared power domains in PLC I/O modules. |
| Reference | Integrated 4.096V buffered reference (REFBUF) - eliminates need for external precision voltage reference and associated layout complexity. |
| Power Dissipation | 81mW typical (4-channel, CMOS mode) - balances performance and thermal management in compact industrial enclosures. |
Pinout & Package
32-lead (5mm × 5mm) QFN package with exposed pad (Pin 33 = GND), optimized for thermal dissipation and high-density routing. Pin assignments are validated per Linear Technology's official LTC2344-18 datasheet (234418f) and match the UH package mechanical drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN0+ / IN0– to IN3+ / IN3– (Pins 1–8) | Differential analog inputs, Channels 0–3 | Simultaneous sampling of four fully isolated signal pairs; supports 0V–VDD common-mode range and ±VREFBUF differential spans. |
| REFIN (Pin 10) | Internal bandgap reference output / external reference input | Provides 2.048V internal reference; accepts 1.25–2.2V external reference for improved accuracy or temperature stability. |
| REFBUF (Pin 12) | Buffered master reference output | Delivers 4.096V (2×REFIN); requires 47μF bypass; can be overdriven with 2.5–5V external reference when REFIN = 0V. |
| LVDS/CMOS (Pin 14) | I/O interface mode select | Tie to OVDD for LVDS; tie to GND for CMOS - configures physical layer without firmware change. |
| PD (Pin 13) | Power-down control | Active-high logic (OVDD-referenced); initiates low-power state (<1μA) and global reset on double assertion. |
| CS / CNV / BUSY / SDOx / SCKI / SCKO (Pins 15–32) | Serial interface control and data | Supports standard SPI timing (CMOS) or differential LVDS signaling; BUSY indicates conversion completion; CNV triggers sampling edge. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel SoftSpan configuration | Enables independent range selection (±4.096V, 0–4.096V, ±2.048V, 0–2.048V) per conversion - eliminates external gain-switching circuitry in multi-sensor systems. |
| Rail-to-rail input overdrive tolerance | Withstands ±VDD differential overvoltage without damage or conversion corruption - protects against sensor fault conditions in field-deployed equipment. |
| Guaranteed operation to 125°C | Validated for H-grade temperature range (–40°C to +125°C) - suitable for under-hood automotive or high-temperature industrial environments. |
| Internal conversion clock | Removes external clock source dependency and jitter sensitivity - simplifies system timing design and improves deterministic latency. |
| Channel-to-channel crosstalk | –109dB (one channel active, others monitored) - preserves signal integrity in mixed-signal applications like multi-axis motion control. |
Applications
| Programmable Logic Controllers | Industrial Process Control |
|---|---|
Use Scenario: High-density analog input modules acquiring 4–20mA current loops, thermocouple outputs, and strain gauge bridges in factory automation cabinets. IC Role / Device Role / Timing Role: Simultaneous 18-bit digitization of four isolated sensor channels with synchronized sampling and integrated reference - replaces discrete op-amp/reference/SAR combinations. Use Value: Eliminates inter-channel skew and external calibration, reducing module BOM count by ≥3 components per channel while maintaining <±0.01% FSR accuracy. | Use Scenario: Distributed I/O nodes monitoring pressure, flow, and level transmitters in oil & gas refineries with ambient temperatures up to 125°C. IC Role / Device Role / Timing Role: Quad-channel ADC with 102dB CMRR and rail-to-rail overdrive tolerance - directly interfaces with 2-wire transmitters without protection diodes or level shifters. Use Value: Enables single-chip solution for Class I Div 2 hazardous area designs, cutting board space by 40% versus dual 2-channel ADCs with external references. |
| Medical Imaging Subsystems | High-Speed Data Acquisition |
Use Scenario: Ultrasound beamformer front-ends digitizing echo return signals from phased-array transducers with precise time-of-flight correlation. IC Role / Device Role / Timing Role: Simultaneous sampling SAR ADC with aperture jitter ≤3ps RMS and 22MHz –3dB input bandwidth - captures transient RF envelope signals without phase distortion. Use Value: Supports 15cm depth resolution at 5MHz center frequency; eliminates need for external sample-and-hold or clock cleanup PLLs. | Use Scenario: Portable oscilloscope modules capturing transient electrical faults in power distribution systems with 400ksps sustained rate across four channels. IC Role / Device Role / Timing Role: Low-latency 18-bit ADC with internal clock and no cycle latency - delivers deterministic 2.5µs conversion period for real-time waveform reconstruction. Use Value: Achieves 95dB SNR at full speed, enabling 16-bit ENOB in battery-powered instruments without cooling fans or heat sinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel, 18-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7606C-18 | 8-channel, parallel/serial interface; ±10V/±5V/0–10V ranges; no integrated reference buffer; 265ksps/ch max | Higher channel count but lower throughput and no SoftSpan per-channel flexibility; requires external reference and driver amps | Select when needing >4 channels or legacy parallel bus interface; avoid if per-channel range agility or integrated reference is required. |
| ADS8684 | 4-channel, 16-bit, 500ksps/ch; integrated PGA (±10.24V to ±125mV ranges); SPI-only; no LVDS option | Lower resolution but higher speed and programmable gain; lacks simultaneous sampling guarantee and CMRR spec | Select for cost-sensitive applications requiring variable gain before ADC; avoid when 18-bit linearity or simultaneous sampling integrity is mandatory. |
Compared with AD7606C-18 and ADS8684, the LTC2344CUH-18#PBF uniquely combines per-channel SoftSpan configurability, integrated 4.096V reference buffer, LVDS/CMOS interface select, and guaranteed simultaneous sampling - making it optimal for space-constrained, high-fidelity multi-sensor systems where channel independence and analog front-end integration are design priorities.
Availability
LTC2344CUH-18#PBF is available at Aetrix Electronics and suitable for industrial process control, medical imaging subsystems, and high-speed data acquisition requiring stable component supply, extended temperature operation (0°C to 70°C), and long-term obsolescence management.
Supply support for LTC2344CUH-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 LTC2344-18 product line was designed for high-accuracy, multi-channel data acquisition in harsh environments - emphasizing simultaneous sampling integrity, flexible input range configuration, and robust reference integration to reduce system-level design complexity.
FAQ
What is the maximum sampling rate per channel for the LTC2344CUH-18#PBF?
The LTC2344CUH-18#PBF achieves 400ksps per channel when all four channels are enabled. Throughput increases to 500ksps/ch (3 channels), 666ksps/ch (2 channels), or 1000ksps/ch (1 channel) by disabling unused channels - enabling dynamic allocation of conversion resources based on real-time signal activity.
Does the LTC2344CUH-18#PBF require an external reference voltage?
No, the LTC2344CUH-18#PBF includes an integrated 2.048V bandgap reference (REFIN) and a buffered 4.096V master reference (REFBUF). External references are optional: REFIN accepts 1.25–2.2V for enhanced accuracy, and REFBUF accepts 2.5–5V when REFIN is grounded - but neither is required for standard operation.
How does the SoftSpan feature work on the LTC2344CUH-18#PBF?
The SoftSpan feature on the LTC2344CUH-18#PBF allows each of the four channels to be independently configured per conversion for ±4.096V, 0–4.096V, ±2.048V, or 0–2.048V input ranges using SPI register writes. This eliminates external gain-switching hardware and enables adaptive signal conditioning in multi-sensor systems without sacrificing sampling synchronization.
What is the operating temperature range of the LTC2344CUH-18#PBF?
The LTC2344CUH-18#PBF is specified for 0°C to 70°C (C-grade), as indicated by the "C" in the part number. This distinguishes it from the I-grade (–40°C to +85°C) and H-grade (–40°C to +125°C) variants - all sharing identical electrical performance but differing only in temperature qualification and screening.
Can the LTC2344CUH-18#PBF interface with both CMOS and LVDS logic families?
Yes, the LTC2344CUH-18#PBF supports both interfaces via the LVDS/CMOS pin (Pin 14): tying it to OVDD selects LVDS mode (differential signaling, 2.375–5.25V OVDD), while tying it to GND selects CMOS mode (single-ended, 1.71–5.25V OVDD). Both modes support 1–4 data lanes and maintain full 400ksps/ch throughput with identical timing specifications.
LTC2344CUH-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:
- 0°C ~ 70°C
- Supplier Device Package:
- 32-QFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2344CUH-18#PBF FAQ
1.How can I place an order for LTC2344CUH-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2344CUH-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 LTC2344CUH-18#PBF reliable?
The price and inventory of LTC2344CUH-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 LTC2344CUH-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2344CUH-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2344CUH-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2344CUH-18#PBF?
LTC2344CUH-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2344CUH-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 LTC2344CUH-18#PBF?
For technical support, including LTC2344CUH-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2344CUH-18#PBF requirements.
6.How does Aetrix verify that LTC2344CUH-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2344CUH-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 LTC2344CUH-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2344CUH-18#PBF?
All LTC2344CUH-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2344CUH-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 LTC2344CUH-18#PBF part is unused and in its original packaging.
Return procedure for LTC2344CUH-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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