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Analog Devices Inc. LTC2373HUH-18#PBF
- Part No.:
- LTC2373HUH-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC2373HUH-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,394
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Product details
Overview
LTC2373HUH-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 integrated 2.048 V temperature-compensated reference and programmable sequencer. It supports fully differential (±4.096 V), pseudo-differential unipolar (0 V to 4.096 V), and pseudo-differential bipolar (±2.048 V) input ranges, achieves ±2.75 LSB INL (max), 100 dB SNR (fully differential, fIN = 1 kHz), and operates across –40°C to +125°C. It is used in high-precision industrial data acquisition systems requiring low crosstalk and guaranteed no missing codes.
For engineers reviewing the LTC2373HUH-18#PBF datasheet, LTC2373HUH-18#PBF pinout, LTC2373HUH-18#PBF application, or LTC2373HUH-18#PBF equivalent, this page provides verified specifications, thermal-grade package details (UH QFN-32, –40°C to +125°C), real-world SNR/THD performance at 1 MHz sampling, and validated alternatives for high-reliability measurement systems.
Technical Context
The LTC2373HUH-18#PBF implements a single-ended clock-driven SAR architecture with internal oscillator timing, eliminating external clock synchronization requirements. Its 8-channel multiplexer features low crosstalk (<–107 dB) and supports per-channel configuration via SPI interface with 16-deep sequencer memory.
It integrates a precision 2.048 V reference with 20 ppm/°C max drift and a buffered 4.096 V output (REFBUF), enabling direct full-scale operation without external reference components. Power management includes nap mode (40 mW typical at 1 Msps) and sleep mode (300 µW), scaling dynamically with sample rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - guarantees 262,144 distinct output codes with no missing codes across all input ranges. |
| Sampling Rate | 1 Msps - enables real-time capture of signals up to 500 kHz (Nyquist-limited) in high-speed DAQ systems. |
| INL (Max) | ±2.75 LSB - ensures end-point linearity error remains under ±0.01% of full scale for calibration-critical applications. |
| SNR (Typ) | 100 dB (fully diff), 95 dB (pseudo-diff) - delivers >16.6 effective number of bits (ENOB) in differential mode at 1 kHz input. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive, downhole oil & gas, and industrial control environments. |
| Power (1 Msps) | 40 mW - enables compact, thermally constrained designs without active cooling in portable instrumentation. |
| Reference | Integrated 2.048 V ref (20 ppm/°C max) + REFBUF - eliminates need for external reference ICs or trimming in space-constrained layouts. |
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 inputs configurable as fully differential pairs (e.g., CH0+/CH0–) or pseudo-differential combinations with COM. |
| COM | Common-mode reference | Serves as return node for pseudo-differential unipolar/bipolar modes; tied to mid-scale voltage (e.g., 0 V or 2.048 V). |
| ADCIN+, ADCIN– | Dedicated differential input pair | High-impedance, low-crosstalk path bypassing multiplexer for highest-accuracy measurements on critical signals. |
| MUXOUT+, MUXOUT– | Multiplexer output pair | Provides buffered access to selected channel output before ADC core-enables external signal monitoring or conditioning. |
| CNV | Conversion start trigger | Edge-sensitive input initiating sample-and-hold; supports precise timing control independent of SPI interface. |
| BUSY | Conversion status indicator | Active-high open-drain output signaling conversion progress-enables interrupt-driven firmware without polling. |
| SDO, SDI, SCK, RDL | SPI-compatible serial interface | Supports 1.8 V to 5 V I/O logic; RDL enables 3-wire shared-bus operation; SDO is tri-state controllable. |
| REFIN, REFBUF | Reference input/buffer output | REFIN accepts 1.25 V–2.4 V external reference; REFBUF delivers 4.096 V (±8 mV) with 13 kΩ output impedance. |
| VDD, OVDD, GND | Power supplies | VDD = 4.75–5.25 V analog supply; OVDD = 1.71–5.25 V digital I/O supply; multiple GND pins ensure low-noise grounding. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable 16-deep sequencer | Enables automatic round-robin or custom channel scanning without host CPU intervention-reduces firmware overhead in PLCs. |
| Selectible digital gain compression | Configures output code scaling to match downstream DSP/FPGA bit-width constraints-preserves dynamic range without truncation loss. |
| No pipeline delay / zero cycle latency | Delivers first valid conversion result within one sample period-critical for closed-loop control with tight timing budgets. |
| Onboard reference buffer (REFBUF) | Drives external circuitry (e.g., sensor excitation, anti-alias filter) with stable 4.096 V output-eliminates need for discrete op-amp buffer stages. |
| Guaranteed operation to 125°C | Validated performance over full H-grade temperature range-enables deployment in engine control units and power inverters without derating. |
Applications
| Industrial Process Control | High-Speed Data Acquisition |
|---|---|
|
Use Scenario: Monitoring multi-sensor arrays (pressure, temperature, flow) in chemical plant DCS cabinets with ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: 8-channel simultaneous sampling front-end digitizing analog sensor outputs with <–107 dB crosstalk to prevent cross-channel interference. Use Value: Enables single-chip replacement of multiple 16-bit ADCs while maintaining 18-bit resolution and reducing BOM count by 60%. |
Use Scenario: Digitizing vibration signatures from accelerometers in predictive maintenance edge nodes operating at 125°C near motors. IC Role / Device Role / Timing Role: High-SNR SAR ADC capturing transient mechanical events at 1 Msps with 100 dB SNR in fully differential mode. Use Value: Delivers >16.6 ENOB at full speed-sufficient to resolve sub-millig acceleration changes without oversampling or averaging. |
| Programmable Logic Controllers | Portable Instrumentation |
|
Use Scenario: Modular I/O modules in DIN-rail mounted PLCs requiring hot-swappable analog input cards with deterministic timing. IC Role / Device Role / Timing Role: Sequencer-controlled channel scanning with BUSY-interrupt handshake ensuring jitter-free scan cycles synchronized to PLC scan time. Use Value: Eliminates need for external timing logic or FPGA glue-reducing card layer count and improving MTBF. |
Use Scenario: Battery-powered handheld multimeters and insulation testers needing ultra-low power during standby and high accuracy during measurement. IC Role / Device Role / Timing Role: Sleep mode (300 µW) extends battery life; fast wake-up (<200 ms REFBUF stabilization) enables responsive user interaction. Use Value: Achieves 18-bit precision without external reference or power-hungry LDOs-cutting system power by 35% vs. discrete reference solutions. |
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 |
|---|---|---|---|
| ADS8860IRGET | 16-bit, 1 Msps, 1-channel, SPI, 2.5 V supply only; no internal reference; requires external REF. | Limited to single-channel systems; lacks multiplexer, sequencer, and temperature grade - unsuitable for multi-sensor industrial use. | Choose when board space is extremely constrained and only one high-speed channel is needed with external reference control. |
| AD7606C-18BSTZ | 18-bit, 1 Msps, 8-channel, parallel/SPI, ±5 V input, integrated reference; but rated only to +85°C (I-grade). | Matches channel count and resolution but lacks extended temperature qualification - not certified for 125°C operation. | Choose for cost-sensitive industrial automation where ambient temperature stays below 85°C and parallel interface is preferred. |
Compared with ADS8860IRGET and AD7606C-18BSTZ, the LTC2373HUH-18#PBF uniquely combines H-grade temperature rating (–40°C to +125°C), integrated 2.048 V reference with buffer, and programmable sequencer in a 5 mm × 5 mm QFN-making it the only drop-in solution for thermally demanding, multi-channel, self-contained precision DAQ designs.
Availability
LTC2373HUH-18#PBF is available at Aetrix Electronics and suitable for industrial process control, high-speed data acquisition, and portable instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2373HUH-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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2373 family was designed specifically for high-accuracy, multi-channel data acquisition in thermally harsh environments-emphasizing low noise, guaranteed monotonicity, and integrated reference stability without external components.
FAQ
What is the maximum operating temperature of the LTC2373HUH-18#PBF?
The LTC2373HUH-18#PBF is rated for continuous operation from –40°C to +125°C, meeting the H-grade specification. This is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section of the official datasheet (page 3), where "LTC2373H" explicitly denotes the –40°C to +125°C temperature range. The UH package's thermal design supports reliable performance at junction temperatures up to 125°C.
Does the LTC2373HUH-18#PBF require an external reference?
No, the LTC2373HUH-18#PBF includes an onboard 2.048 V temperature-compensated reference with ≤20 ppm/°C drift and a buffered 4.096 V output (REFBUF). External reference is optional only if higher accuracy or different voltage levels are required-REFIN accepts 1.25 V to 2.4 V inputs, but the internal reference is fully functional and factory-trimmed for standalone operation.
How many analog input channels does the LTC2373HUH-18#PBF support?
The LTC2373HUH-18#PBF supports eight analog input channels (CH0–CH7), configurable as fully differential pairs, pseudo-differential unipolar, or pseudo-differential bipolar inputs using the integrated low-crosstalk multiplexer. The device also provides dedicated ADCIN+/ADCIN– pins for highest-accuracy single-channel measurements bypassing the mux.
What is the SNR performance of the LTC2373HUH-18#PBF at 1 Msps?
At 1 Msps and fIN = 1 kHz, the LTC2373HUH-18#PBF achieves 100 dB SNR (typical) in fully differential mode and 95 dB SNR (typical) in pseudo-differential mode, as specified in the Dynamic Accuracy table (page 4). These values are measured with REFIN = 2.048 V and are guaranteed over the full –40°C to +125°C temperature range.
Is the LTC2373HUH-18#PBF pin-compatible with other variants in the LTC2373 family?
Yes, all LTC2373-18 variants-including LTC2373CUH-18#PBF (C-grade), LTC2373IUH-18#PBF (I-grade), and LTC2373HUH-18#PBF (H-grade)-share identical 32-lead 5 mm × 5 mm QFN (UH) packaging and pinout. Mechanical and electrical compatibility is confirmed in the Pin Configuration diagram (page 2) and Order Information table (page 3) of the datasheet.
LTC2373HUH-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 ~ 125°C
- Supplier Device Package:
- 32-QFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2373HUH-18#PBF FAQ
1.How can I place an order for LTC2373HUH-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2373HUH-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 LTC2373HUH-18#PBF reliable?
The price and inventory of LTC2373HUH-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 LTC2373HUH-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2373HUH-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2373HUH-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2373HUH-18#PBF?
LTC2373HUH-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2373HUH-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 LTC2373HUH-18#PBF?
For technical support, including LTC2373HUH-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2373HUH-18#PBF requirements.
6.How does Aetrix verify that LTC2373HUH-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2373HUH-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 LTC2373HUH-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2373HUH-18#PBF?
All LTC2373HUH-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2373HUH-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 LTC2373HUH-18#PBF part is unused and in its original packaging.
Return procedure for LTC2373HUH-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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