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Analog Devices Inc. LTC2345CUK-18#PBF
- Part No.:
- LTC2345CUK-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC2345CUK-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 48QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2345CUK-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, octal-channel simultaneous-sampling SAR ADC with differential SoftSpan™ inputs, 200ksps per channel throughput, ±5LSB INL (±4.096V range), 91.8dB SNR, and integrated 4.096V reference buffer. It operates from a 5V supply and supports both CMOS (1.8V–5V) and LVDS serial interfaces for industrial data acquisition systems requiring high dynamic range and channel-to-channel isolation.
For engineers reviewing the LTC2345CUK-18#PBF datasheet, LTC2345CUK-18#PBF pinout, LTC2345CUK-18#PBF application, or LTC2345CUK-18#PBF equivalent, key selection criteria include per-channel SoftSpan input range configurability (±4.096V/0–4.096V/±2.048V/0–2.048V), rail-to-rail common mode range (0V to VDD), 102dB CMRR at 200Hz, and guaranteed no missing codes at 18 bits across its 0°C to 70°C operating range.
Technical Context
The LTC2345CUK-18#PBF implements an 8-channel simultaneous sampling architecture using independent sample-and-hold circuits per channel, enabling true time-aligned digitization of multi-sensor signals without inter-channel skew. Its SoftSpan™ digital control allows real-time reconfiguration of each channel's full-scale range on a conversion-by-conversion basis without hardware changes.
It integrates a precision 2.048V bandgap reference (±20ppm/°C TC) and a buffered 4.096V output (±5mV initial accuracy), eliminating external reference components. The analog front-end delivers 31MHz –3dB input bandwidth, 3ps RMS aperture jitter, and 150ps aperture delay matching between channels - critical for coherent multi-channel FFT analysis in vibration monitoring or medical imaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - guarantees 1 part-in-262,144 quantization granularity for high-fidelity sensor signal capture. |
| Sampling Rate | 200ksps per channel (8-channel mode) - supports real-time monitoring of fast transients in PLC I/O modules. |
| INL (Max) | ±5LSB at ±4.096V range - ensures <0.0012% end-point linearity error for calibrated measurement systems. |
| SNR (Typ) | 91.8dB - enables >15 effective bits (ENOB ≈ 15.0) in 2kHz bandwidth applications. |
| CMRR (Typ) | 102dB at 200Hz - rejects common-mode noise from motor drives or long sensor cables in industrial environments. |
| Power Dissipation | 81mW (CMOS mode, 8 channels) - suitable for thermally constrained embedded DAQ modules with passive cooling. |
| Operating Temp | 0°C to 70°C - qualified for commercial-grade industrial control cabinets without forced air. |
Pinout & Package
48-lead (7mm × 7mm) plastic QFN package with exposed thermal pad (Pin 49 = GND). Pin pitch: 0.5mm. 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 | Eight fully independent, wide common-mode (0V–5V) input pairs supporting simultaneous sampling and per-channel SoftSpan range selection. |
| REFIN (Pin 19), REFBUF (Pin 21) | Reference input/output | Internal 2.048V bandgap reference output (REFIN); buffered 4.096V master reference (REFBUF) - bypassing REFIN with 0.1µF ceramic ensures low-noise operation. |
| CS, CNV, BUSY, SDO0–SDO7, SCKI, SCKO, SDI (Pins 22–39) | Digital interface | Configurable SPI CMOS (1.8V–5V) or LVDS serial I/O - supports 1–8 data lanes for flexible throughput vs. bus-width trade-offs. |
| PD (Pin 24) | Power-down control | Active-high signal entering ultra-low-power state (<0.33mW) - enables duty-cycled sensing in battery-powered edge nodes. |
| VDD (Pins 38, 40, 42), OVDD (Pin 37), VDDLBYP (Pin 43) | Supply rails | VDD = 4.75–5.25V analog core; OVDD = 1.71–5.25V I/O voltage; VDDLBYP requires 2.2µF ceramic bypass to GND for internal regulator stability. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel SoftSpan input ranges | Independent software-selectable ranges per conversion: ±4.096V, 0–4.096V, ±2.048V, or 0–2.048V - eliminates external gain-switching circuitry in multi-signal systems. |
| Rail-to-rail input overdrive tolerance | Withstands ±VDD differential overvoltage without corruption - protects against sensor fault conditions in harsh industrial settings. |
| Simultaneous sampling & channel isolation | 8 independent S/H circuits + 107dB channel-to-channel crosstalk - preserves phase coherence for synchronized vibration or ultrasound beamforming. |
| Integrated reference buffer | On-chip 4.096V reference buffer (±5mV accuracy, 20ppm/°C TC) - removes need for external precision reference and reduces BOM count by ≥3 components. |
| Guaranteed operation to 125°C (H-grade variant) | This C-grade part (0°C–70°C) shares identical pinout and register map with H-grade - enables seamless thermal upgrade path without PCB redesign. |
Applications
| Programmable Logic Controllers | Industrial Process Control |
|---|---|
Use Scenario: High-density analog input modules acquiring current/voltage signals from 4–20mA transmitters, RTDs, and strain gauges in factory automation racks. IC Role / Device Role / Timing Role: Simultaneous 8-channel digitizer with per-channel SoftSpan configuration - enables mixed-signal acquisition (e.g., ±10V motor feedback + 0–5V temperature) on single IC. Use Value: Eliminates multiple ADCs and external programmable gain amplifiers, reducing module size by 35% and calibration complexity. | Use Scenario: Distributed I/O nodes in oil & gas pipeline SCADA systems measuring pressure, flow, and valve position under EMI-heavy environments. IC Role / Device Role / Timing Role: Precision ADC with 102dB CMRR and 31MHz input bandwidth - rejects common-mode noise from variable-frequency drives and long cable runs. Use Value: Maintains ±0.005% measurement accuracy despite 60Hz ground loops and RF interference, reducing field recalibration frequency by 70%. |
| Medical Imaging | High Speed Data Acquisition |
Use Scenario: Ultrasound beamformer front-end digitizing echo signals from 64+ transducer elements with precise time alignment. IC Role / Device Role / Timing Role: Simultaneous sampling ADC with 150ps aperture delay matching - ensures sub-nanosecond channel synchronization for coherent beam steering. Use Value: Enables real-time synthetic aperture focusing without post-processing correction, improving image resolution by 22% at 5MHz center frequency. | Use Scenario: Portable oscilloscope or spectrum analyzer capturing transient waveforms (e.g., power quality events, ESD pulses) with >100ksps sustained rate. IC Role / Device Role / Timing Role: Low-latency SAR ADC with internal conversion clock and no cycle latency - delivers deterministic 5µs conversion time per channel. Use Value: Supports gap-free streaming at 200ksps across all 8 channels into FPGA memory buffers, enabling 10ms continuous waveform capture. |
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, ±10V/±5V/0–10V ranges; 200ksps; integrated reference; SPI-only interface; 64-lead LQFP. | Fixed input ranges (no per-channel SoftSpan); lacks LVDS option; larger footprint; higher power (120mW). | Select when system uses only standard industrial ranges and requires SPI simplicity over LVDS noise immunity. |
| ADS8688 | 16-bit, 8-channel, ±10.24V/0–10.24V ranges; 1MSPS; internal reference; SPI interface; 48-lead QFN. | 2-bit lower resolution; higher speed but lower SNR (86dB); no simultaneous sampling (multiplexed); no LVDS support. | Select when cost-sensitive applications prioritize throughput over ENOB and can tolerate multiplexed acquisition timing skew. |
Compared with AD7606C-18 and ADS8688, the LTC2345CUK-18#PBF uniquely delivers per-channel configurable SoftSpan ranges and LVDS interface in a compact 48-lead QFN - enabling mixed-signal systems with superior noise immunity and minimal board area, especially where phase-coherent multi-channel capture is mandatory.
Availability
LTC2345CUK-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, long-term lifecycle support, and traceable sourcing for safety-critical designs.
Supply support for LTC2345CUK-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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2345 family was designed specifically for high-accuracy, multi-channel data acquisition in electrically noisy industrial and medical environments - emphasizing simultaneous sampling integrity, flexible input scaling, and robust reference integration.
FAQ
What input voltage ranges does the LTC2345CUK-18#PBF support per channel?
The LTC2345CUK-18#PBF supports four software-configurable SoftSpan input ranges per channel: ±4.096V, 0V to 4.096V, ±2.048V, and 0V to 2.048V. These are selected independently for each of the eight channels via SPI register writes before each conversion, enabling mixed-signal acquisition without external gain switching.
Does the LTC2345CUK-18#PBF require an external reference?
No, the LTC2345CUK-18#PBF includes an integrated 2.048V bandgap reference and a buffered 4.096V output (REFBUF pin). When using the internal reference, only a 0.1µF ceramic capacitor from REFIN to GND is required. An external reference (1.25V–2.2V) may be applied to REFIN for improved accuracy.
What is the maximum sampling rate when all eight channels are active on the LTC2345CUK-18#PBF?
When all eight channels are enabled, the LTC2345CUK-18#PBF achieves a maximum sampling rate of 200ksps per channel. This corresponds to a total aggregate throughput of 1.6Msps, with a fixed 5µs conversion cycle time and no latency between conversions.
How does the LTC2345CUK-18#PBF handle common-mode noise in industrial environments?
The LTC2345CUK-18#PBF provides 102dB typical common-mode rejection ratio (CMRR) at 200Hz and maintains >84dB CMRR across its full 0V–5V input common-mode range. Its differential input architecture, combined with rail-to-rail overdrive tolerance, suppresses noise from ground loops, motor drives, and long sensor cables without external filtering.
Is the LTC2345CUK-18#PBF pin-compatible with other grades in the same family?
Yes, the LTC2345CUK-18#PBF shares identical pinout, package (48-lead QFN), and register map with the I-grade (–40°C to 85°C) and H-grade (–40°C to 125°C) variants (e.g., LTC2345IUK-18#PBF, LTC2345HUK-18#PBF). This enables drop-in thermal upgrades without PCB or firmware changes.
LTC2345CUK-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:
- 0°C ~ 70°C
- Supplier Device Package:
- 48-QFN (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2345CUK-18#PBF FAQ
1.How can I place an order for LTC2345CUK-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2345CUK-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 LTC2345CUK-18#PBF reliable?
The price and inventory of LTC2345CUK-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 LTC2345CUK-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2345CUK-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2345CUK-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2345CUK-18#PBF?
LTC2345CUK-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2345CUK-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 LTC2345CUK-18#PBF?
For technical support, including LTC2345CUK-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2345CUK-18#PBF requirements.
6.How does Aetrix verify that LTC2345CUK-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2345CUK-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 LTC2345CUK-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2345CUK-18#PBF?
All LTC2345CUK-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2345CUK-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 LTC2345CUK-18#PBF part is unused and in its original packaging.
Return procedure for LTC2345CUK-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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