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Analog Devices Inc. LTC2345CUK-16#PBF
- Part No.:
- LTC2345CUK-16#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC2345CUK-16#PBF.pdf
- Description:
- IC ADC 16BIT SAR 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,280
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Product details
Overview
LTC2345CUK-16#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, octal-channel simultaneous-sampling SAR ADC with differential SoftSpan™ inputs, 200ksps per channel throughput, ±1.25LSB INL, 91dB SNR, and integrated 4.096V reference buffer. It operates from a single 5V supply and supports configurable input ranges (±4.096V, 0–4.096V, ±2.048V, 0–2.048V) per channel-ideal for high-precision industrial data acquisition systems requiring wide common-mode flexibility and rail-to-rail overdrive tolerance.
For engineers reviewing the LTC2345CUK-16#PBF datasheet, LTC2345CUK-16#PBF pinout, LTC2345CUK-16#PBF application, or LTC2345CUK-16#PBF equivalent, key selection criteria include per-channel SoftSpan range reconfiguration, 102dB CMRR at 200Hz, SPI CMOS/LVDS interface compatibility, guaranteed no-missing-codes operation across temperature, and QFN-48 package thermal performance up to +70°C ambient.
Technical Context
The LTC2345CUK-16#PBF implements an 8-channel simultaneous sampling architecture using independent sample-and-hold circuits feeding a shared 16-bit SAR core, enabling true time-aligned digitization across all channels without inter-channel skew. Its SoftSpan™ digital control allows real-time, conversion-by-conversion configuration of input range and polarity per channel via SPI register writes.
It integrates a precision 2.048V bandgap reference (REFIN) and a buffered 4.096V master reference (REFBUF), both internally trimmed and temperature-compensated. The analog front-end features rail-to-rail input overdrive tolerance, 31MHz –3dB input bandwidth, and 150ps aperture delay matching between channels-critical for phase-coherent multi-channel signal analysis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees full 65,536-code dynamic range with no missing codes across temperature. |
| Sampling Rate | 200ksps per channel (8-channel mode) - enables real-time capture of signals up to ~99kHz Nyquist bandwidth. |
| INL | ±1.25LSB max - ensures <0.002% end-point linearity error for high-fidelity sensor measurement and calibration. |
| SNR | 91dB typical (fIN = 2kHz, ±4.096V range) - delivers >15 effective bits (ENOB ≈ 15.1) in demanding low-noise applications. |
| CMRR | 102dB typical at 200Hz - rejects common-mode interference from noisy industrial environments without external instrumentation amps. |
| Interface | SPI CMOS (1.8–5V) or LVDS serial I/O - supports noise-immune long-reach communication or low-voltage microcontroller interfacing. |
| Power | 81mW typical (CMOS mode, 8 channels) - balances performance and thermal management in space-constrained PLC modules. |
| Package | 48-lead 7mm × 7mm QFN - exposes thermal pad for efficient heat dissipation; rated for 0°C to +70°C operation. |
Pinout & Package
Package: 48-lead plastic QFN (7mm × 7mm), exposed thermal pad (Pin 49 = GND), lead-free finish, tape-and-reel packaging. Designed for automated assembly and thermal reliability in industrial PCBs.
| 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 to VDD) input pairs; each pair accepts ±4.096V, 0–4.096V, ±2.048V, or 0–2.048V signals based on SoftSpan configuration. |
| REFIN (Pin 19) | Bandgap reference output / external reference input | Provides 2.048V internal reference; accepts 1.25V–2.2V external reference for improved accuracy or drift performance. |
| REFBUF (Pin 21) | Buffered master reference output | Delivers stable 4.096V (2×REFIN) reference voltage; requires 47μF bypass capacitor for low-noise operation. |
| CNV (Pin 23) | Conversion start trigger | Edge-sensitive input initiating simultaneous sampling across all enabled channels; minimum pulse width 40ns. |
| SDO0–SDO7 (Pins 24–31) | Serial data outputs | CMOS or LVDS-configurable parallel data lanes; support 1–8-lane bus width to trade off throughput vs. routing complexity. |
| SCKI / SCKO (Pins 32–35) | Serial clock input/output | LVDS or CMOS clock interface; supports up to 100MHz CMOS SCKI frequency or sub-ns LVDS timing skew control. |
| CS (Pin 42) | Chip select | Active-low enable for SPI command/data transfer; bus enable time <15ns ensures fast multi-device arbitration. |
| PD (Pin 22) | Power-down control | Asserting PD reduces supply current to ≤65μA (C-grade); wake-up time 200ms due to REFBUF stabilization requirement. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel SoftSpan™ configuration | Each of eight channels independently selects ±4.096V, 0–4.096V, ±2.048V, or 0–2.048V input range on every conversion-enabling mixed-signal acquisition (e.g., thermocouple + strain gauge) without external gain switching. |
| 102dB CMRR at 200Hz | Rejects power-line interference and ground-loop noise in factory-floor installations without additional filtering or isolation components. |
| Simultaneous sampling with 150ps aperture matching | Preserves phase relationships between channels for accurate FFT-based spectral analysis, motor current signature analysis, or vibration monitoring. |
| Rail-to-rail input overdrive tolerance | Withstands transient overvoltage up to ±VDD without latch-up or code corruption-reducing need for external clamping diodes in harsh EMI environments. |
| Integrated 4.096V reference buffer | Eliminates external reference IC and associated layout sensitivity; 5ppm/°C tempco ensures <±0.05% full-scale drift from 0°C to 70°C. |
| Guaranteed operation to +70°C | Validated performance across full commercial temperature range-suitable for enclosed control cabinets without forced air cooling. |
Applications
| Programmable Logic Controllers | Industrial Process Control |
|---|---|
Use Scenario: High-density analog I/O module acquiring temperature, pressure, and flow sensor signals in real time within a DIN-rail mounted PLC chassis. IC Role / Device Role / Timing Role: Simultaneous-sampling ADC providing time-aligned 16-bit digitization across eight sensor channels with programmable input ranges per channel. Use Value: Eliminates inter-channel timing skew and enables synchronized control loop execution; SoftSpan allows direct connection of diverse sensors (e.g., ±10V RTD transmitters and 4–20mA current loops) without external signal conditioning. | Use Scenario: Distributed I/O node in a refinery DCS system measuring valve position feedback, tank level, and reactor temperature under EMI-heavy conditions. IC Role / Device Role / Timing Role: Precision ADC with 102dB CMRR and rail-to-rail overdrive tolerance serving as front-end digitizer for critical safety-related measurements. Use Value: Maintains accuracy despite ground potential differences and 50/60Hz noise; integrated reference eliminates drift-induced calibration drift over extended maintenance intervals. |
| Medical Imaging Subsystems | High-Speed Data Acquisition |
Use Scenario: Portable ultrasound beamformer front-end digitizing echo return signals from multiple transducer elements with precise time alignment. IC Role / Device Role / Timing Role: Octal simultaneous-sampling ADC delivering phase-coherent 16-bit samples at 200ksps per channel for digital beamforming algorithms. Use Value: 150ps aperture matching preserves spatial resolution; 91dB SNR supports >70dB dynamic range required for tissue contrast differentiation. | Use Scenario: Benchtop oscilloscope or spectrum analyzer capturing transient waveforms from RF test equipment or power electronics switching events. IC Role / Device Role / Timing Role: High-fidelity SAR ADC with 31MHz input bandwidth and low THD (–113dB) used in multi-channel acquisition cards for lab-grade instruments. Use Value: Enables accurate reconstruction of fast edges and harmonic content; LVDS interface supports noise-immune transmission to FPGA processing blocks over >10cm traces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal, 16-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7606C-16 (Analog Devices) | 16-bit, 8-channel, simultaneous-sampling SAR ADC; 1MSPS total throughput (125ksps/channel), ±2.5V/±5V fixed input ranges, integrated 2.5V ref, SPI-only interface. | Higher aggregate throughput but lower per-channel rate; lacks per-channel SoftSpan flexibility and LVDS option; optimized for cost-sensitive industrial DAQ. | Select AD7606C-16 when higher aggregate sampling speed suffices and input signal ranges are uniform across channels. |
| ADS8688 (Texas Instruments) | 16-bit, 8-channel, pseudo-simultaneous SAR ADC; 1MSPS total (125ksps avg), ±10.24V/±5.12V/0–10.24V/0–5.12V ranges, integrated 4.096V ref, SPI interface only. | No true simultaneous sampling-uses multiplexed S/H; lower CMRR (96dB); wider unipolar/bipolar ranges but no per-conversion reconfiguration. | Select ADS8688 when absolute channel-to-channel timing alignment is not required and wider input voltage ranges are needed. |
Compared with AD7606C-16 and ADS8688, the LTC2345CUK-16#PBF uniquely combines true simultaneous sampling, per-channel SoftSpan reconfiguration, LVDS interface capability, and 102dB CMRR-making it the only option among the three suitable for phase-critical, mixed-range, noise-immune industrial and medical acquisition where timing integrity and signal flexibility are non-negotiable.
Availability
LTC2345CUK-16#PBF is available at Aetrix Electronics and suitable for programmable logic controllers, industrial process control systems, and medical imaging subsystems requiring stable component supply, long-term lifecycle support, and guaranteed commercial-temperature performance.
Supply support for LTC2345CUK-16#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 LTC2345 family was designed specifically for high-accuracy, multi-channel data acquisition in electrically noisy, thermally demanding industrial environments-emphasizing simultaneous sampling integrity, flexible input scaling, and robust reference stability.
FAQ
What is the maximum operating temperature for the LTC2345CUK-16#PBF?
The LTC2345CUK-16#PBF is specified for operation from 0°C to +70°C ambient temperature. This C-grade variant uses the same die as the I-grade (–40°C to +85°C) and H-grade (–40°C to +125°C) versions but is tested and binned to meet full electrical specifications only within the 0°C to +70°C range. Thermal design should ensure junction temperature remains below 150°C under worst-case power dissipation (95mW max in LVDS mode).
Does the LTC2345CUK-16#PBF require external reference components?
No-the LTC2345CUK-16#PBF integrates a 2.048V bandgap reference (REFIN) and a buffered 4.096V master reference (REFBUF). External bypass capacitors are required: 0.1µF ceramic at REFIN and 47µF at REFBUF. An external reference may be applied to REFIN (1.25V–2.2V) to improve accuracy or temperature stability, but it is not required for basic operation of the LTC2345CUK-16#PBF.
How does the SoftSpan feature work on the LTC2345CUK-16#PBF?
The SoftSpan feature on the LTC2345CUK-16#PBF allows independent, conversion-by-conversion configuration of each of the eight input channels to accept one of four differential input ranges: ±4.096V, 0–4.096V, ±2.048V, or 0–2.048V. Configuration is performed via SPI register writes before each conversion cycle-enabling mixed-signal acquisition (e.g., simultaneously digitizing ±10V and 0–5V sensors) without hardware reconfiguration or external gain stages.
Can the LTC2345CUK-16#PBF operate with a 3.3V digital supply (OVDD)?
Yes-the LTC2345CUK-16#PBF supports OVDD from 1.71V to 5.25V in CMOS mode, making 3.3V fully compatible. All digital I/O thresholds scale with OVDD (VIH = 0.8×OVDD, VIL = 0.2×OVDD), and timing parameters (e.g., tSCKI = 10ns min) are guaranteed across this range. For LVDS mode, OVDD must be ≥2.375V; 3.3V is acceptable and commonly used for LVDS termination.
What is the purpose of the PD (power-down) pin on the LTC2345CUK-16#PBF?
The PD pin on the LTC2345CUK-16#PBF controls deep power-down mode, reducing supply current to ≤65μA (C-grade) while preserving register state. When asserted, the internal reference buffer and analog circuitry are disabled. After deassertion, a 200ms wake-up time is required for REFBUF to stabilize before valid conversions resume-this delay is inherent to the internal 4.096V buffer's 47μF capacitor charging time and applies to every LTC2345CUK-16#PBF power-down cycle.
LTC2345CUK-16#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:
- 16
- 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-16#PBF FAQ
1.How can I place an order for LTC2345CUK-16#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2345CUK-16#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-16#PBF reliable?
The price and inventory of LTC2345CUK-16#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-16#PBF is usually 5 days.
3.What payment methods are accepted for LTC2345CUK-16#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2345CUK-16#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2345CUK-16#PBF?
LTC2345CUK-16#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2345CUK-16#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-16#PBF?
For technical support, including LTC2345CUK-16#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2345CUK-16#PBF requirements.
6.How does Aetrix verify that LTC2345CUK-16#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2345CUK-16#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-16#PBF meets industry standards.
7.What is the process for return or replacement of LTC2345CUK-16#PBF?
All LTC2345CUK-16#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2345CUK-16#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-16#PBF part is unused and in its original packaging.
Return procedure for LTC2345CUK-16#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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