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Analog Devices Inc. LTC2373IUH-18#PBF
- Part No.:
- LTC2373IUH-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC2373IUH-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,716
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Product details
Overview
LTC2373IUH-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 –40°C to +85°C for high-precision industrial data acquisition systems.
For engineers reviewing the LTC2373IUH-18#PBF datasheet, LTC2373IUH-18#PBF pinout, LTC2373IUH-18#PBF application, or LTC2373IUH-18#PBF equivalent, key selection criteria include guaranteed 18-bit no-missing-codes performance over temperature, programmable sequencer depth of 16, low 40 mW typical power dissipation at full throughput, and integrated reference buffer enabling direct connection to external 5 V reference sources.
Technical Context
The LTC2373IUH-18#PBF implements a true SAR architecture with no pipeline delay or cycle latency, enabling deterministic conversion timing critical for closed-loop control. Its highly configurable 8-channel multiplexer supports three selectable input modes-fully differential, pseudo-differential unipolar (0 V to 4.096 V), and pseudo-differential bipolar (±2.048 V)-with channel-to-channel crosstalk of –107 dB.
Conversion is initiated by a single CNV pulse; internal oscillator sets tCONV = 460–527 ns, while tCYC = 1 µs enables 1 Msps sustained sampling. The device features a programmable logic sequencer, digital gain compression, and automatic nap mode between conversions to scale power with sample rate-dissipating only 300 µW in sleep mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit with guaranteed no missing codes-ensures monotonicity and precision in high-dynamic-range measurements. |
| Sampling Rate | 1 Msps maximum-supports real-time capture of signals up to 22 MHz (–3 dB input bandwidth). |
| SNR | 100 dB (fully differential, fIN = 1 kHz)-enables >16.6 effective number of bits (ENOB) in noise-sensitive applications. |
| INL | ±2.75 LSB (maximum, all input ranges)-guarantees end-point linearity for calibration-critical instrumentation. |
| Reference | Onboard 2.048 V ±5 mV (±20 ppm/°C TC)-eliminates need for external reference in space-constrained designs. |
| Power Dissipation | 40 mW (1 Msps), 300 µW (sleep mode)-reduces thermal load and enables battery-powered portable instrumentation. |
| Operating Temp | –40°C to +85°C-qualified for industrial environments without derating. |
Pinout & Package
Package: 32-lead 5 mm × 5 mm plastic QFN (UH package) with exposed pad soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 | Analog input channels | Eight single-ended or differential-capable inputs; configured via sequencer for automated multi-channel scanning. |
| COM | Common-mode reference | Provides return path for pseudo-differential inputs; must be tied to appropriate common-mode voltage per selected range. |
| ADCIN+, ADCIN– | Differential analog input | Primary high-precision input pair for fully differential mode; accepts ±4.096 V swing referenced to COM. |
| MUXOUT+, MUXOUT– | Multiplexer output | Buffered outputs of internal mux; used for external signal conditioning or monitoring before ADC core. |
| CNV | Conversion start | Edge-triggered input initiating conversion; rising edge starts acquisition with fixed aperture jitter of 4 ps RMS. |
| BUSY | Conversion status | Active-high open-drain output indicating ongoing conversion; used for timing synchronization in interrupt-driven systems. |
| SDO, SDI, SCK, RDL | SPI interface | Full-duplex SPI-compatible I/O supporting 1.8 V to 5 V logic levels; RDL enables 3-wire bus sharing with other peripherals. |
| REFBUF, REFIN | Reference control | 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; multiple GND pins ensure low-noise grounding. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable 16-deep sequencer | Enables autonomous multi-channel acquisition without host CPU intervention-reducing firmware overhead in PLCs and DAQ systems. |
| Selectable digital gain compression | Prevents overflow during transient overvoltage events by scaling digital output-improving system robustness without analog clamping. |
| No pipeline delay / zero cycle latency | Delivers first valid result within one conversion time-essential for real-time feedback loops requiring immediate response. |
| Low 4 ps RMS aperture jitter | Minimizes sampling uncertainty, preserving SNR at high input frequencies-critical for spectral analysis and communications test equipment. |
| Internal 2.048 V reference with 20 ppm/°C TC | Reduces BOM count and layout complexity while maintaining accuracy across industrial temperature range without external trimming. |
Applications
| Programmable Logic Controllers | Industrial Process Control |
|---|---|
Use Scenario: High-speed analog input module acquiring sensor data (pressure, temperature, flow) across 8 channels in real time. IC Role / Device Role / Timing Role: Primary 18-bit SAR ADC performing synchronized multi-channel sampling at 1 Msps with deterministic latency. Use Value: Guaranteed no-missing-codes and ±2.75 LSB INL ensure accurate representation of small signal changes in closed-loop control algorithms. | Use Scenario: Distributed I/O node measuring thermocouple, RTD, and 4–20 mA loop signals in hazardous area transmitters. IC Role / Device Role / Timing Role: Precision front-end ADC with integrated reference and programmable input ranges eliminating external signal conditioning components. Use Value: Onboard 2.048 V reference and –40°C to +85°C operation enable reliable field deployment without recalibration or thermal drift compensation. |
| High Speed Data Acquisition | Portable or Compact Instrumentation |
Use Scenario: Benchtop oscilloscope or spectrum analyzer capturing wideband signals up to 22 MHz with high dynamic range. IC Role / Device Role / Timing Role: Core digitizer delivering 100 dB SNR and 114 dB SFDR in fully differential mode for clean FFT-based analysis. Use Value: Low 4 ps RMS aperture jitter preserves signal fidelity at Nyquist, enabling accurate harmonic and intermodulation distortion measurement. | Use Scenario: Handheld multimeter or portable power quality analyzer requiring battery life >8 hours and sub-ppm measurement accuracy. IC Role / Device Role / Timing Role: Low-power 18-bit ADC operating in nap mode between samples, reducing average current to <1.25 mA at 100 kSPS. Use Value: 300 µW sleep mode and automatic power scaling extend runtime while maintaining full resolution and linearity on wake-up. |
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 | 8-channel, 18-bit, 1 MSPS, but uses parallel interface and requires external reference; higher 65 mW power at full rate. | Designed for FPGA/microcontroller systems with parallel bus; less suitable for SPI-only microcontrollers or space-constrained layouts. | Choose AD7606C-18 when parallel interface bandwidth or simultaneous sampling across all channels is required. |
| ADS8688IPWR | 8-channel, 16-bit, 1 MSPS, integrated PGA and reference; lower resolution but wider input range (±10.24 V) and built-in protection. | Targeted at ruggedized industrial sensors with varying signal amplitudes; lacks 18-bit precision and 100 dB SNR for metrology-grade use. | Choose ADS8688IPWR when input signal conditioning (gain/attenuation) and overvoltage protection are prioritized over ultimate resolution. |
Compared with AD7606C-18 and ADS8688IPWR, the LTC2373IUH-18#PBF uniquely combines SPI interface, onboard reference, 18-bit no-missing-codes guarantee, and ultra-low aperture jitter-making it optimal for compact, high-fidelity, microcontroller-based data loggers and embedded test instruments where board area and deterministic timing are critical.
Availability
LTC2373IUH-18#PBF is available at Aetrix Electronics and suitable for industrial process control, programmable logic controllers, and high-speed data acquisition systems requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to +85°C.
Supply support for LTC2373IUH-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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2373 family was designed specifically for high-accuracy, low-latency, multi-channel data acquisition in space- and power-constrained industrial environments-emphasizing integration, temperature stability, and ease of use without sacrificing resolution or speed.
FAQ
What is the guaranteed integral nonlinearity (INL) specification for LTC2373IUH-18#PBF over its full operating temperature range?
The LTC2373IUH-18#PBF guarantees ±2.75 LSB maximum INL across all input ranges (fully differential, pseudo-differential unipolar, and pseudo-differential bipolar) over its specified –40°C to +85°C operating temperature range. This specification is tested and guaranteed-not just characterized-and ensures end-point linearity critical for calibration and metrology applications.
Does LTC2373IUH-18#PBF require an external reference, or does it include an internal reference?
The LTC2373IUH-18#PBF includes an onboard 2.048 V temperature-compensated reference with ±5 mV initial accuracy and 20 ppm/°C max temperature coefficient. It also provides a reference buffer (REFBUF) that outputs 4.096 V when enabled. An external reference may be applied to REFIN for improved accuracy or different voltage levels, but it is not required for basic operation of LTC2373IUH-18#PBF.
What is the minimum acquisition time and total conversion time for LTC2373IUH-18#PBF at 1 Msps?
At 1 Msps, the LTC2373IUH-18#PBF has a guaranteed conversion time (tCONV) of 460–527 ns and acquisition time (tACQ) of 460 ns. The total conversion cycle time (tCYC) is 1 µs, enabling sustained 1 Msps throughput. These values are specified over the full –40°C to +85°C range and do not require external clocking or timing margining.
Can LTC2373IUH-18#PBF operate with 1.8 V I/O logic levels while using a 5 V analog supply?
Yes, LTC2373IUH-18#PBF supports independent OVDD supply from 1.71 V to 5.25 V, allowing full SPI compatibility with 1.8 V, 2.5 V, 3.3 V, or 5 V logic families while maintaining a 5 V analog supply (VDD). Digital inputs accept VIH = 0.8 × OVDD and VIL = 0.2 × OVDD, ensuring robust interfacing to low-voltage microcontrollers without level shifters.
How does the programmable sequencer in LTC2373IUH-18#PBF reduce host processor overhead in multi-channel applications?
The LTC2373IUH-18#PBF includes a 16-deep programmable sequencer that autonomously cycles through up to 16 user-defined channel configurations-including input range, gain, and averaging-without host intervention. Once configured, the sequencer executes continuously after each CNV pulse, freeing the host MCU from managing channel switching and enabling deterministic, jitter-free multi-channel sampling in LTC2373IUH-18#PBF-based systems.
LTC2373IUH-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:
- -40°C ~ 85°C
- Supplier Device Package:
- 32-QFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2373IUH-18#PBF FAQ
1.How can I place an order for LTC2373IUH-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2373IUH-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 LTC2373IUH-18#PBF reliable?
The price and inventory of LTC2373IUH-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 LTC2373IUH-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2373IUH-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2373IUH-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2373IUH-18#PBF?
LTC2373IUH-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2373IUH-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 LTC2373IUH-18#PBF?
For technical support, including LTC2373IUH-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2373IUH-18#PBF requirements.
6.How does Aetrix verify that LTC2373IUH-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2373IUH-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 LTC2373IUH-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2373IUH-18#PBF?
All LTC2373IUH-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2373IUH-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 LTC2373IUH-18#PBF part is unused and in its original packaging.
Return procedure for LTC2373IUH-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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