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Analog Devices Inc. LTC2345CUK-16#TRPBF
- Part No.:
- LTC2345CUK-16#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC2345CUK-16#TRPBF.pdf
- Description:
- IC ADC 16BIT SAR 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,495
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Product details
Overview
LTC2345CUK-16#TRPBF 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 both CMOS (1.8V–5V) and LVDS serial interfaces in a 48-lead QFN package - ideal for high-channel-count industrial data acquisition systems requiring flexible input range configuration.
For engineers reviewing the LTC2345CUK-16#TRPBF datasheet, LTC2345CUK-16#TRPBF pinout, LTC2345CUK-16#TRPBF application, or LTC2345CUK-16#TRPBF equivalent, key selection criteria include per-channel SoftSpan programmability (±4.096V/0–4.096V/±2.048V/0–2.048V), 102dB CMRR at 200Hz, rail-to-rail input overdrive tolerance, guaranteed no missing codes at 16 bits, and operation up to 70°C ambient.
Technical Context
The LTC2345CUK-16#TRPBF implements an 8-channel simultaneous sampling architecture using independent sample-and-hold circuits feeding a shared 16-bit SAR core, enabling true time-aligned conversion across all channels without inter-channel skew. Its SoftSpan™ digital control allows per-conversion configuration of input ranges via SPI/LVDS interface, eliminating external gain-switching circuitry.
It integrates a precision 2.048V bandgap reference (REFIN) and a buffered 4.096V master reference (REFBUF), with internal conversion clock generation and zero-cycle latency. The analog front-end features 0V to VDD common mode range, 31MHz –3dB input bandwidth, and 150ps aperture delay matching between channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees full 65,536-code resolution with no missing codes across temperature. |
| Sampling Rate | 200ksps per channel (8-channel mode) - enables real-time capture of signals up to ~95kHz Nyquist bandwidth. |
| INL | ±1.25LSB max - ensures accurate end-point linearity critical for closed-loop control and calibration-critical systems. |
| SNR | 91dB typical (±4.096V range, fIN = 2kHz) - supports >15 effective bits for high-fidelity signal reconstruction. |
| CMRR | 102dB typical at 200Hz - rejects common-mode noise from motor drives, power supplies, or long sensor cables. |
| Interface | SPI CMOS (1.8V–5V) or LVDS - provides noise immunity in electrically noisy environments or high-speed backplane routing. |
| Power Dissipation | 81mW typical (8-channel, CMOS mode) - enables dense channel packing without thermal derating in compact enclosures. |
| Operating Temp | 0°C to 70°C (C-grade) - validated for commercial/industrial equipment operating in controlled ambient environments. |
Pinout & Package
Package: 48-lead (7mm × 7mm) plastic QFN with exposed pad (Pin 49 = GND). RoHS-compliant, lead-free finish, tape-and-reel packaging (#TRPBF).
| 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 register setting. |
| REFIN (Pin 19) | Bandgap reference output / external reference input | Outputs 2.048V internal reference; accepts 1.25V–2.2V external reference to override internal bandgap for improved accuracy or temperature stability. |
| REFBUF (Pin 21) | Buffered master reference output | Provides 4.096V (2×REFIN) low-impedance reference for ADC core; requires 47µF bypass to GND for stability during high-current switching events. |
| CS, SCKI, SDI, SDO0–SDO7, SCKO, BUSY, CNV (Pins 22–39) | Digital I/O interface | Configurable for CMOS (1.8V–5V logic) or LVDS signaling; supports 1–8 data lanes; CNV initiates conversion; BUSY indicates active conversion cycle. |
| PD (Pin 24) | Power-down control | Active-high signal placing device into <0.33mW standby; wake-up time is 200ms due to REFBUF re-stabilization requirement. |
| VDD (Pins 38, 40, 42), OVDD (Pin 37), VDDLBYP (Pin 43), GND (Pins 15–18, 20, 30, 41, 44–46, 49) | Supply and bypass | VDD = 4.75–5.25V analog supply; OVDD = 1.71–5.25V I/O supply; VDDLBYP must be bypassed with 2.2µF ceramic to GND - not connected externally. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel SoftSpan input range selection | Each of eight channels independently configurable for ±4.096V, 0–4.096V, ±2.048V, or 0–2.048V on a conversion-by-conversion basis - eliminates external programmable gain amplifiers and reduces BOM count. |
| Simultaneous sampling with matched aperture delay | 150ps max inter-channel aperture delay matching ensures phase-coherent multi-channel acquisition for vibration analysis or power quality monitoring. |
| Integrated 4.096V reference buffer with 20kΩ output impedance | Eliminates need for external reference buffers or op-amps; supports direct drive of multiple ADCs or external circuitry with minimal droop under dynamic load. |
| Rail-to-rail input overdrive tolerance | Accepts differential input voltages from −VDD to +VDD without damage or performance degradation - protects against sensor transients or wiring faults in field-deployed systems. |
| LVDS or CMOS serial interface with programmable lane count | Reduces PCB trace count vs parallel interfaces; LVDS mode provides EMI resilience in motor drive cabinets; CMOS mode supports legacy microcontroller interfacing with variable voltage levels. |
| Guaranteed operation to 125°C junction temperature | Enables use in thermally constrained enclosures (e.g., PLC backplanes); C-grade part rated for 0°C to 70°C ambient with sufficient heatsinking. |
Applications
| Programmable Logic Controllers | Industrial Process Control |
|---|---|
Use Scenario: High-density analog input modules acquiring voltage/current signals from 4–20mA transmitters, RTDs, and strain gauges across 8 channels simultaneously. IC Role / Device Role / Timing Role: Primary ADC engine performing synchronized sampling and digitization with per-channel range auto-scaling to match sensor full-scale outputs. Use Value: Eliminates external PGA and multiplexer stages, reducing component count and board area while maintaining 16-bit fidelity across mixed-signal sensor types. | Use Scenario: Distributed I/O nodes in chemical plant DCS systems measuring pressure, flow, and temperature with tight channel-to-channel timing alignment. IC Role / Device Role / Timing Role: Simultaneous sampling ADC providing time-aligned data for multivariable control algorithms and cross-channel diagnostics. Use Value: 102dB CMRR suppresses common-mode noise from 50/60Hz mains coupling and VFD harmonics, improving measurement integrity in electrically hostile environments. |
| 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 correlation. IC Role / Device Role / Timing Role: Multi-channel ADC capturing RF envelope data with sub-ns aperture matching to preserve spatial resolution across receive channels. Use Value: 150ps aperture delay matching enables coherent beamforming without hardware calibration, directly supporting real-time image reconstruction. | Use Scenario: Portable oscilloscope or spectrum analyzer capturing transient waveforms from power electronics, motor drives, or RF sources. IC Role / Device Role / Timing Role: High-throughput ADC delivering 200ksps/channel sustained rate with 91dB SNR for accurate spectral analysis and distortion measurement. Use Value: 31MHz –3dB input bandwidth and rail-to-rail overdrive tolerance allow direct connection to passive probes or current sensors without front-end attenuation or clamping. |
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; 1MSPS max; integrated reference; but only ±10V/±5V/0–10V/0–5V SoftSpan ranges; no LVDS option; higher power (120mW). | Targets higher-speed applications (>200ksps) where wider input voltage ranges are needed, but lacks LVDS noise immunity and fine-grained SoftSpan flexibility. | Select AD7606C-16 when system requires >200ksps sampling or ±10V input support; choose LTC2345CUK-16#TRPBF for lower power, LVDS capability, and finer 2.048V/4.096V range granularity. |
| ADS8688 (Texas Instruments) | 16-bit, 8-channel, successive approximation; 500ksps max; integrated reference; SPI-only (1.8V–5.5V); no LVDS; ±10.24V/0–10.24V ranges only; 92dB SNR. | Designed for cost-sensitive industrial DAQ with simpler interface requirements; lacks simultaneous sampling guarantee and CMRR spec above 84dB. | Select ADS8688 for budget-constrained designs needing basic 8-channel sampling without LVDS or ultra-high CMRR; LTC2345CUK-16#TRPBF remains preferred for noise-immune, high-CMRR, or flexible-range applications. |
Compared with AD7606C-16 and ADS8688, the LTC2345CUK-16#TRPBF uniquely combines LVDS interface for EMI resilience, 102dB CMRR for noisy plant-floor environments, and per-channel SoftSpan configurability down to ±2.048V - making it optimal for precision, multi-sensor industrial and medical systems where signal integrity and range adaptability are critical.
Availability
LTC2345CUK-16#TRPBF is available at Aetrix Electronics and suitable for programmable logic controllers, industrial process control systems, and high-speed data acquisition requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC2345CUK-16#TRPBF 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 LTC2345 family was designed by Analog Devices to address demanding multi-channel data acquisition needs in industrial automation and test equipment - emphasizing simultaneous sampling fidelity, flexible input range configuration, and robust noise immunity in harsh electromagnetic environments.
FAQ
What is the maximum sampling rate per channel for the LTC2345CUK-16#TRPBF?
The LTC2345CUK-16#TRPBF achieves 200ksps per channel when all eight channels are enabled. Throughput scales inversely with channel count: disabling channels increases per-channel rate up to 1000ksps (1-channel mode). This behavior is governed by fixed total conversion time per sample cycle, not by interleaving.
Does the LTC2345CUK-16#TRPBF require an external reference?
No - the LTC2345CUK-16#TRPBF includes an internal 2.048V bandgap reference (REFIN) and a buffered 4.096V master reference (REFBUF), both factory-trimmed. An external reference (1.25V–2.2V) may be applied to REFIN to improve accuracy or temperature drift, but is not required for standard operation of the LTC2345CUK-16#TRPBF.
How does the SoftSpan feature work on the LTC2345CUK-16#TRPBF?
The SoftSpan feature on the LTC2345CUK-16#TRPBF allows independent, per-conversion configuration of each channel's input range via SPI or LVDS interface - selecting among ±4.096V, 0–4.096V, ±2.048V, or 0–2.048V. This is implemented digitally in the control logic and does not require external components, enabling dynamic range adaptation without hardware changes to the LTC2345CUK-16#TRPBF.
What is the purpose of the PD (Power-Down) pin on the LTC2345CUK-16#TRPBF?
The PD pin on the LTC2345CUK-16#TRPBF is an active-high control that places the device into ultra-low-power standby mode (<0.33mW). When asserted, it disables the reference buffer, analog front-end, and digital core. Wake-up requires 200ms for REFBUF stabilization before valid conversions resume - a critical timing consideration in duty-cycled systems using the LTC2345CUK-16#TRPBF.
Can the LTC2345CUK-16#TRPBF operate with a 3.3V OVDD supply in CMOS mode?
Yes - the LTC2345CUK-16#TRPBF supports OVDD from 1.71V to 5.25V in CMOS mode, including 3.3V. Digital input thresholds scale with OVDD (VIH ≥ 0.8×OVDD, VIL ≤ 0.2×OVDD), and output drive strength is specified at ±50mA. This allows seamless interfacing with 3.3V FPGAs or microcontrollers without level-shifting when using the LTC2345CUK-16#TRPBF.
LTC2345CUK-16#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- SoftSpan™
- Package/Case:
- 48-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC2345CUK-16#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2345CUK-16#TRPBF 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#TRPBF reliable?
The price and inventory of LTC2345CUK-16#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2345CUK-16#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2345CUK-16#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2345CUK-16#TRPBF?
LTC2345CUK-16#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2345CUK-16#TRPBF 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#TRPBF?
For technical support, including LTC2345CUK-16#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2345CUK-16#TRPBF requirements.
6.How does Aetrix verify that LTC2345CUK-16#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2345CUK-16#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2345CUK-16#TRPBF?
All LTC2345CUK-16#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2345CUK-16#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC2345CUK-16#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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