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Analog Devices Inc. LTC2373CUH-18#PBF
- Part No.:
- LTC2373CUH-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC2373CUH-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,047
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Product details
Overview
LTC2373CUH-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, 1 Msps, 8-channel successive approximation register (SAR) analog-to-digital converter with fully differential ±4.096 V input range, 100 dB SNR (typical), and onboard 2.048 V temperature-compensated reference. It operates from a single 5 V supply, supports SPI-compatible serial interface up to 100 MHz, and delivers ±2.75 LSB INL (max) across all input configurations - used in high-precision industrial data acquisition systems requiring low crosstalk and guaranteed no missing codes.
For engineers reviewing the LTC2373CUH-18#PBF datasheet, LTC2373CUH-18#PBF pinout, LTC2373CUH-18#PBF application, or LTC2373CUH-18#PBF equivalent, this page provides verified technical context, package mapping, real-world application mappings, and validated alternative options for precision multichannel sampling in PLCs, ATE, and portable instrumentation where thermal stability and SNR integrity are critical.
Technical Context
The LTC2373CUH-18#PBF implements a true SAR architecture with no pipeline delay or cycle latency, enabling deterministic conversion timing and immediate result availability. Its internal 2.048 V reference features ≤20 ppm/°C drift and is buffered for direct use or overdrive capability up to 5 V.
It integrates a low-crosstalk 8-channel multiplexer supporting three selectable analog input modes - fully differential, pseudo-differential unipolar (0 V to 4.096 V), and pseudo-differential bipolar (±2.048 V) - with programmable sequencer depth of 16 and digital gain compression for dynamic range optimization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit with guaranteed no missing codes - ensures full utilization of dynamic range without code gaps in precision measurement. |
| Sampling Rate | 1 Msps maximum - enables real-time capture of signals up to ~22 MHz bandwidth (–3 dB input linear bandwidth). |
| SNR | 100 dB typical (fully differential, fIN = 1 kHz) - supports >16.6 effective number of bits (ENOB) in high-fidelity acquisition. |
| INL | ±2.75 LSB maximum - maintains end-point linearity accuracy across temperature for calibrated sensor interfaces. |
| Power Dissipation | 40 mW at 1 Msps; 300 µW in sleep mode - scales with sample rate and enables low-power operation in battery-powered instruments. |
| Reference | Onboard 2.048 V ±0.25% (2.043–2.053 V), 20 ppm/°C max drift - eliminates external reference design complexity and improves system-level thermal stability. |
| Operating Temp | 0°C to +70°C (C-grade) - qualified for commercial and industrial control environments with stable performance across full range. |
Pinout & Package
Package: 32-lead 5 mm × 5 mm plastic QFN (UH package); exposed pad (Pin 33) must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 | Analog input channels | Eight single-ended or differential-capable inputs; support multiplexed scanning with configurable input range per channel. |
| COM | Common-mode reference | Return node for pseudo-differential configurations; sets common-mode voltage for unipolar/bipolar ranges. |
| ADCIN+, ADCIN– | Dedicated differential input pair | Direct high-accuracy path bypassing multiplexer; used for critical single-channel measurements. |
| MUXOUT+, MUXOUT– | Multiplexer output pair | Provides buffered post-mux differential signal for external filtering or amplification before ADC core. |
| CNV | Conversion start trigger | Edge-sensitive command initiating sampling; supports precise timing control independent of SPI clock. |
| BUSY | Conversion status indicator | Active-high signal indicating ongoing conversion; enables interrupt-driven firmware synchronization. |
| SDO, SDI, SCK, RDL | SPI interface signals | Full-duplex serial interface compatible with 1.8 V–5 V logic; RDL enables 3-wire bus sharing with other devices. |
| REFBUF, REFIN | Reference buffer and input | REFBUF outputs 4.096 V (when enabled); REFIN accepts external 2.048 V reference or disables internal buffer when grounded. |
| VDD, OVDD, GND | Power supplies | VDD = 4.75–5.25 V analog supply; OVDD = 1.71–5.25 V I/O supply; separate grounds reduce noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable sequencer (16-deep) | Enables automatic round-robin or custom channel scan order without host CPU intervention - reduces firmware overhead in multichannel systems. |
| Selectable digital gain compression | Adjusts output code scaling to optimize dynamic range usage for small-signal inputs - improves effective resolution in sub-full-scale conditions. |
| No pipeline delay / zero cycle latency | Delivers first valid conversion result within one sample period - essential for closed-loop control and time-critical triggering applications. |
| Internal oscillator | Eliminates need for external clock source; simplifies layout and reduces BOM count while maintaining tight timing control over conversion duration. |
| Auto-nap between conversions | Reduces average power proportionally to sampling rate - cuts dissipation by >50% at 500 ksps versus continuous 1 Msps operation. |
Applications
| Programmable Logic Controllers | Industrial Process Control |
|---|---|
Use Scenario: High-density analog input modules in modular PLC backplanes acquiring sensor data (temperature, pressure, flow) across 8 channels simultaneously. IC Role / Device Role / Timing Role: Primary 18-bit ADC front-end with integrated reference and sequencer - handles multi-sensor polling with deterministic timing and minimal host coordination. Use Value: Eliminates external reference and mux ICs, reducing component count and board area while maintaining ±2.75 LSB INL across operating temperature for certified calibration compliance. | Use Scenario: Distributed I/O nodes in chemical plant DCS systems monitoring reactor parameters with strict EMC and thermal stability requirements. IC Role / Device Role / Timing Role: Precision SAR ADC with 100 dB SNR and 22 MHz input bandwidth - captures fast transients in valve position feedback or motor current sensing without aliasing. Use Value: Onboard 2.048 V reference with ≤20 ppm/°C drift ensures measurement repeatability across 0°C–70°C ambient, avoiding recalibration during seasonal temperature shifts. |
| High-Speed Data Acquisition | Portable or Compact Instrumentation |
Use Scenario: Benchtop oscilloscopes and spectrum analyzers requiring 1 Msps sustained sampling with low harmonic distortion for FFT-based analysis. IC Role / Device Role / Timing Role: Core digitizer with 100 dB SNR and –110 dB THD - enables clean spectral representation of 1 kHz test tones with <0.85 LSBRMS transition noise. Use Value: Fully differential input architecture and –107 dB channel-to-channel crosstalk prevent signal leakage between adjacent channels during simultaneous multi-channel capture. | Use Scenario: Handheld power quality analyzers performing real-time voltage/current harmonics analysis in field service applications. IC Role / Device Role / Timing Role: Low-power 18-bit ADC with 300 µW sleep mode - extends battery life during idle periods while enabling instant wake-up for triggered measurements. Use Value: Single 5 V supply and 1.8 V–5 V I/O compatibility simplify power architecture and allow direct interfacing with low-voltage microcontrollers without level shifters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7606C-18 | 18-bit, 1 Msps, 8-channel, but uses parallel interface and requires external reference; higher power (65 mW) and larger 64-lead LQFP package. | Best suited for legacy designs with parallel bus infrastructure and space-tolerant layouts; lacks integrated reference and sequencer flexibility. | Select AD7606C-18 only if existing system uses parallel data transfer and external reference is already present - avoids redesigning interface logic. |
| ADS8688IPWR | 18-bit, 500 ksps, 8-channel, SPI interface, integrated reference, but lower SNR (92 dB typ) and no fully differential mode; rated for –40°C to +125°C. | Ideal for extended temperature environments like motor drives, but insufficient SNR for metrology-grade applications requiring >98 dB. | Choose ADS8688IPWR for cost-sensitive, wide-temp industrial monitoring where 92 dB SNR meets spec - not for lab-grade precision. |
Compared with AD7606C-18 and ADS8688IPWR, the LTC2373CUH-18#PBF uniquely combines integrated 2.048 V reference, fully differential input support, 100 dB SNR, and sequencer programmability in a compact 5 mm × 5 mm QFN - making it optimal for new designs prioritizing board space, thermal stability, and signal fidelity without external support components.
Availability
LTC2373CUH-18#PBF 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 guaranteed C-grade temperature performance.
Supply support for LTC2373CUH-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.
The LTC2373-18 product line was designed for high-accuracy, multichannel data acquisition in space-constrained industrial and instrumentation applications - emphasizing integrated references, low power, and deterministic timing without pipeline latency.
FAQ
What is the maximum sampling rate supported by the LTC2373CUH-18#PBF?
The LTC2373CUH-18#PBF supports a maximum sampling rate of 1 Msps (1 million samples per second), with a guaranteed conversion time of 460 ns to 527 ns and minimum inter-conversion interval of 1 µs. This rate is achievable across the full 0°C to +70°C operating temperature range with VDD = 4.75 V to 5.25 V and OVDD ≥ 1.71 V.
Does the LTC2373CUH-18#PBF include an internal voltage reference?
Yes, the LTC2373CUH-18#PBF integrates a precision 2.048 V temperature-compensated reference with ±0.25% initial accuracy (2.043 V to 2.053 V) and ≤20 ppm/°C maximum drift over temperature. It also includes a reference buffer capable of delivering 4.096 V output, configurable via REFIN pin grounding or external overdrive.
What input configurations does the LTC2373CUH-18#PBF support?
The LTC2373CUH-18#PBF supports three analog input configurations: fully differential (±4.096 V), pseudo-differential unipolar (0 V to 4.096 V), and pseudo-differential bipolar (±2.048 V). Each mode is selectable per channel via configuration register, and the device guarantees ±2.75 LSB INL and 100 dB SNR (fully diff) across all modes.
How does the sequencer function in the LTC2373CUH-18#PBF?
The LTC2373CUH-18#PBF includes a programmable 16-deep sequencer that automates channel selection and input range configuration without host intervention. Once loaded, it executes predefined scan patterns - including round-robin, custom order, or single-channel repeat - reducing firmware overhead and ensuring deterministic timing between conversions.
What is the power consumption profile of the LTC2373CUH-18#PBF at different operating modes?
The LTC2373CUH-18#PBF consumes 40 mW at 1 Msps, drops to 6.25 mW in nap mode between conversions, and draws only 300 µW in sleep mode. Power scales linearly with sample rate in nap mode, and sleep mode retains register state while disabling reference buffer and ADC core - enabling rapid wake-up (<200 ms REFBUF wake-up time) for event-triggered acquisition.
LTC2373CUH-18#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 8
- Input Type:
- Differential, Pseudo-Differential
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 32-QFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2373CUH-18#PBF FAQ
1.How can I place an order for LTC2373CUH-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2373CUH-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 LTC2373CUH-18#PBF reliable?
The price and inventory of LTC2373CUH-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 LTC2373CUH-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2373CUH-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2373CUH-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2373CUH-18#PBF?
LTC2373CUH-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2373CUH-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 LTC2373CUH-18#PBF?
For technical support, including LTC2373CUH-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2373CUH-18#PBF requirements.
6.How does Aetrix verify that LTC2373CUH-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2373CUH-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 LTC2373CUH-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2373CUH-18#PBF?
All LTC2373CUH-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2373CUH-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 LTC2373CUH-18#PBF part is unused and in its original packaging.
Return procedure for LTC2373CUH-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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