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Analog Devices Inc. LTC2326HMS-18#PBF
- Part No.:
- LTC2326HMS-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2326HMS-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,822
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Product details
Overview
LTC2326HMS-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, 250ksps successive approximation register (SAR) analog-to-digital converter with pseudo-differential inputs and true bipolar ±10.24V input range. It operates from a single 5V supply, integrates a low-drift 2.048V internal reference and reference buffer, and delivers 95dB SNR and ±5LSB INL max - ideal for high-voltage industrial data acquisition requiring wide dynamic range and precision at extended temperature.
For engineers reviewing the LTC2326HMS-18#PBF datasheet, LTC2326HMS-18#PBF pinout, LTC2326HMS-18#PBF application, or LTC2326HMS-18#PBF equivalent, key selection considerations include guaranteed 18-bit no-missing-codes operation over –40°C to 125°C, SPI-compatible daisy-chain interface supporting 1.8V–5V I/O, internal conversion clock, and nap/sleep power management delivering 28mW typical active and 300μW sleep dissipation.
Technical Context
The LTC2326HMS-18#PBF implements a charge-redistribution SAR architecture with a 2.048V bandgap reference buffered to 4.096V, enabling ±10.24V full-scale input via 2× gain scaling. Its pseudo-differential front-end uses resistor-divider networks and clamped inputs to support true bipolar operation while rejecting common-mode noise up to 66dB at 125kHz.
Conversion timing is fully self-contained: a rising edge on CNV initiates acquisition and conversion, with fixed 1.9–3μs conversion time and no pipeline latency. The SPI-compatible serial interface supports both normal mode (RDL/SDI as bus enable) and daisy-chain mode (RDL/SDI as SDI), with SDO output in 2's complement format and timing validated down to 1.71V OVDD.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - guarantees monotonic transfer function and no missing codes across full operating range. |
| Sampling Rate | 250ksps - enables real-time capture of signals up to 7MHz bandwidth with <1µs transient response. |
| INL (Max) | ±5 LSB - ensures absolute accuracy within ±0.0019% of full scale, critical for calibration-sensitive instrumentation. |
| SNR (Typ) | 95 dB at fIN = 2kHz - corresponds to effective resolution >15.5 bits, preserving signal fidelity in noisy environments. |
| Input Range | ±10.24V true bipolar - supports direct interfacing to industrial ±10V sensor outputs without external level-shifting. |
| Reference | 2.048V internal bandgap (20ppm/°C max drift) with onboard buffer - eliminates need for external reference components in most applications. |
| Power (Active) | 28 mW at 250ksps - scales linearly with sample rate, enabling low-power operation during partial-load conditions. |
| Operating Temp | –40°C to +125°C - qualified for harsh industrial and automotive under-hood environments without derating. |
Pinout & Package
Package: 16-lead plastic MSOP (3mm × 4.9mm, 0.65mm pitch), thermally enhanced with exposed pad (not electrically connected). RoHS-compliant, lead-free finish (#PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDLBYP (1) | 2.5V LDO bypass | Internal regulator output for analog core; requires 2.2μF ceramic capacitor to GND for stability and noise suppression. |
| VDD (2) | 5V main supply | Primary analog/digital power rail (4.75–5.25V); bypassed with 10μF ceramic capacitor to minimize switching noise coupling. |
| GND (3,6,16) | Analog/digital ground | Three dedicated ground pins reduce impedance and separate return paths for analog, digital, and reference sections. |
| IN+ (4) | Pseudo-differential analog input | High-impedance input (2.083kΩ) accepting ±10.24V swing relative to IN–; clamped to ±16.5V absolute limits. |
| IN– (5) | Common-mode sense reference | Fixed ±500mV range referenced to GND; must be tied to system ground or remote sense point for accurate CMRR. |
| REFBUF (7) | Buffered reference output | 4.096V nominal output (2× REFIN); decoupled with 47μF ceramic capacitor; can be overdriven externally (2.5–5V) to adjust input range. |
| REFIN (8) | Internal reference output / external reference input | 2.048V bandgap output (bypassed with 100nF); accepts 1.25–2.4V external references to scale full-scale range proportionally. |
| CNV (9) | Convert trigger | Rising-edge–sensitive control input; powers up ADC and initiates conversion sequence; logic levels referenced to OVDD. |
| CHAIN (10) | Daisy-chain mode select | Low = normal mode (RDL/SDI = bus enable); high = chain mode (RDL/SDI = serial data input for multi-ADC cascading). |
| BUSY (11) | Conversion status indicator | Active-high open-drain output signaling conversion progress; transitions low when 18-bit result is ready on SDO. |
| RDL/SDI (12) | Mode-dependent serial interface | In normal mode: bus enable for SDO tri-state control; in chain mode: serial data input for daisy-chained ADCs. |
| SCK (13) | Serial clock input | Accepts up to 100MHz clock (10ns min period); controls data shift-out timing on SDO; logic levels referenced to OVDD. |
| SDO (14) | Serial data output | 2's complement 18-bit result shifted MSB-first on SCK rising edges; supports daisy-chain readout in chain mode. |
| OVDD (15) | I/O interface supply | Digital I/O voltage rail (1.71–5.25V); sets logic thresholds for all digital pins; bypassed with 0.1μF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| No missing codes at 18 bits | Guaranteed monotonicity across full temperature range (–40°C to 125°C), eliminating code ambiguities in closed-loop control. |
| True bipolar ±10.24V input | Direct compatibility with industrial ±10V sensor standards without external op-amp level-shifting circuitry. |
| Onboard 2.048V reference + buffer | Eliminates external reference IC and associated layout complexity; 20ppm/°C max drift ensures stable full-scale over temperature. |
| SPI-compatible daisy-chain mode | Enables synchronized sampling across multiple LTC2326HMS-18#PBF devices using single SCK and CNV lines - reduces host GPIO count and timing skew. |
| Nap and sleep power modes | Reduces current draw to 0.1mA (nap) and 300μA (sleep), enabling energy-efficient burst-sampling architectures in portable instrumentation. |
| No cycle latency / zero pipeline delay | Each CNV edge produces one deterministic 18-bit result after fixed 1.9–3μs - essential for real-time feedback control loops. |
Applications
| Programmable Logic Controllers | Industrial Process Control |
|---|---|
Use Scenario: High-accuracy analog input module in PLC backplane handling multiple ±10V field sensor signals (e.g., pressure, flow, temperature transmitters). IC Role / Device Role / Timing Role: Primary SAR ADC digitizing conditioned sensor outputs with deterministic 4μs inter-conversion timing and no pipeline artifacts. Use Value: ±5LSB INL and 95dB SNR ensure sub-0.01% measurement repeatability across 0–100% span, meeting SIL-2 functional safety requirements for loop integrity. | Use Scenario: Distributed I/O node in refinery DCS acquiring vibration, valve position, and motor current signals in hazardous area enclosures. IC Role / Device Role / Timing Role: High-reliability ADC operating continuously at 125°C ambient, leveraging internal reference stability and thermal robustness. Use Value: Guaranteed –40°C to +125°C operation with 20ppm/°C reference drift enables long-term calibration stability without field recalibration cycles. |
| High Speed Data Acquisition | Portable or Compact Instrumentation |
Use Scenario: 16-channel simultaneous-sampling DAQ card for FFT-based spectral analysis of mechanical resonance signatures. IC Role / Device Role / Timing Role: One per channel, synchronized via shared CNV and daisy-chained SDO for coherent 32k-point FFT at 250ksps aggregate throughput. Use Value: 95dB SNR and –111dB THD preserve dynamic range and harmonic purity required for detecting sub-60dB sidebands in bearing fault diagnosis. | Use Scenario: Battery-powered handheld multimeter or oscilloscope probe with isolated ±10V input range and 100ksps+ sampling capability. IC Role / Device Role / Timing Role: Low-power ADC entering nap mode between measurements, waking only on trigger event to minimize quiescent current. Use Value: 28mW active and 300μW sleep power dissipation extends battery life to >10 hours on two AA cells while maintaining 18-bit resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8860IDRCT | 16-bit, 1MSPS, single-ended input only; no integrated reference; requires external 2.5V ref; 1.8V–3.6V supply only. | Higher speed but lower resolution and no true bipolar input - unsuitable for ±10V industrial sensors without external signal conditioning. | Select only if 16-bit resolution suffices and system already provides precision external reference and level-shifting circuitry. |
| AD7606C-18BSTZ | 8-channel simultaneous-sampling, ±10V input, integrated reference; 200ksps/channel; 6mm × 6mm LQFP package; 5V-only supply. | Multi-channel integration reduces board space vs. discrete LTC2326HMS-18#PBF per channel, but lacks daisy-chain flexibility and has higher power (65mW). | Prefer for compact multi-channel systems where channel count justifies integrated solution and 200ksps/channel meets timing needs. |
Compared with ADS8860IDRCT and AD7606C-18BSTZ, the LTC2326HMS-18#PBF uniquely combines 18-bit resolution, true ±10.24V bipolar input, integrated low-drift reference, and daisy-chain capability in a thermally optimized MSOP - making it optimal for high-accuracy, single-channel industrial DAQ where board space, thermal margin, and signal integrity are prioritized over raw channel density.
Availability
LTC2326HMS-18#PBF is available at Aetrix Electronics and suitable for industrial process control, programmable logic controllers, and high-speed data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2326HMS-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 LTC2326HMS-18#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, engineered specifically for demanding industrial applications requiring wide input range, high SNR, and guaranteed operation from –40°C to 125°C.
FAQ
What is the maximum operating temperature rating for the LTC2326HMS-18#PBF?
The LTC2326HMS-18#PBF is rated for continuous operation from –40°C to +125°C, with full electrical specifications guaranteed across this extended industrial temperature range. This H-grade qualification makes it suitable for under-hood automotive, oil & gas downhole, and factory-floor control applications where ambient temperatures exceed standard commercial or industrial grades.
Does the LTC2326HMS-18#PBF require an external reference, or does it include one internally?
The LTC2326HMS-18#PBF includes a factory-trimmed 2.048V internal bandgap reference and a dedicated reference buffer that outputs 4.096V. This enables its ±10.24V input range without external components. However, REFIN and REFBUF pins support overdriving with external references (1.25–2.4V at REFIN or 2.5–5V at REFBUF) to adjust full-scale range or improve accuracy and drift performance.
How does the daisy-chain mode work on the LTC2326HMS-18#PBF, and what pins are involved?
Daisy-chain mode is enabled by pulling CHAIN (Pin 10) high. In this mode, RDL/SDI (Pin 12) becomes SDI - accepting serial data from the previous device in the chain - while SDO (Pin 14) outputs the current device's 18-bit result. All devices share CNV and SCK, allowing synchronized conversions and cascaded readout with minimal host interface overhead.
What power-saving features does the LTC2326HMS-18#PBF offer, and how much power does it consume in each state?
The LTC2326HMS-18#PBF offers three power states: active (28mW at 250ksps), nap mode (42mW during conversion completion, dropping to ~0.1mA total current), and sleep mode (300μW). Nap mode automatically engages between conversions; sleep mode is entered via software command and reduces current to microamp levels for extended idle periods - critical for battery-operated instrumentation.
Is the LTC2326HMS-18#PBF pin-compatible with other members of the LTC2326 family, such as the C- or I-grade versions?
Yes, the LTC2326HMS-18#PBF shares identical pinout, package (16-lead MSOP), and electrical interface with the LTC2326CMS-18#PBF (0°C to 70°C) and LTC2326IMS-18#PBF (–40°C to 85°C). Only the temperature grade and part marking differ; PCB layout and firmware are fully interchangeable across all variants - simplifying design reuse and qualification across product tiers.
LTC2326HMS-18#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 1
- Input Type:
- Pseudo-Differential
- Data Interface:
- SPI
- Configuration:
- 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:
- 16-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2326HMS-18#PBF FAQ
1.How can I place an order for LTC2326HMS-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2326HMS-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 LTC2326HMS-18#PBF reliable?
The price and inventory of LTC2326HMS-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 LTC2326HMS-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2326HMS-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2326HMS-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2326HMS-18#PBF?
LTC2326HMS-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2326HMS-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 LTC2326HMS-18#PBF?
For technical support, including LTC2326HMS-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2326HMS-18#PBF requirements.
6.How does Aetrix verify that LTC2326HMS-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2326HMS-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 LTC2326HMS-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2326HMS-18#PBF?
All LTC2326HMS-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2326HMS-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 LTC2326HMS-18#PBF part is unused and in its original packaging.
Return procedure for LTC2326HMS-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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