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Analog Devices Inc. LTC2326CMS-18#PBF
- Part No.:
- LTC2326CMS-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2326CMS-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,836
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Product details
Overview
LTC2326CMS-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, 250ksps pseudo-differential successive approximation register (SAR) ADC with true bipolar ±10.24V input range, 95dB SNR, ±5LSB INL max, and integrated 2.048V low-drift reference. It operates from a single 5V supply and targets high-precision industrial data acquisition systems requiring wide dynamic range and low noise.
For engineers reviewing the LTC2326CMS-18#PBF datasheet, LTC2326CMS-18#PBF pinout, LTC2326CMS-18#PBF application, or LTC2326CMS-18#PBF equivalent, key selection criteria include guaranteed 18-bit no-missing-codes performance, daisy-chain SPI interface compatibility across 1.8V–5V logic levels, internal conversion clock, nap/sleep power management, and MSOP-16 packaging for space-constrained PCB layouts.
Technical Context
The LTC2326CMS-18#PBF implements a charge-redistribution SAR architecture with pseudo-differential input sampling, where IN+ and IN– drive resistor-divider networks to level-shift ±2.5×REFBUF into the 0–REFBUF core ADC range. Its internal 2.048V bandgap reference feeds a gain-of-2 buffer delivering 4.096V at REFBUF, enabling ±10.24V full-scale input.
Conversion timing is fully self-contained via an internal oscillator (tCONV = 1.9–3µs), eliminating external clock dependencies. The SPI-compatible serial interface supports both normal mode (RDL/SDI as bus enable) and daisy-chain mode (RDL/SDI as SDI), with BUSY signaling and 2's complement output format - all operating with zero cycle latency and no pipeline delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit with guaranteed no missing codes - ensures full dynamic range utilization without code gaps in precision measurement. |
| Sampling Rate | 250ksps maximum - supports real-time capture of signals up to ~7MHz bandwidth (–3dB input linear BW). |
| SNR | 95dB typical at fIN = 2kHz (±10.24V range) - enables >15.5 effective bits of resolution in high-fidelity acquisition. |
| INL | ±5LSB maximum over temperature - maintains linearity critical for calibration-sensitive instrumentation. |
| Reference | Integrated 2.048V ±20ppm/°C bandgap + 4.096V buffered output - eliminates external reference component count and drift sensitivity. |
| Power | 28mW typical at 250ksps; 300μW in sleep mode - scales dynamically with sample rate for energy-efficient system design. |
| Digital Interface | SPI-compatible with 1.8V–5V OVDD support and daisy-chain capability - simplifies multi-channel synchronization without FPGA logic overhead. |
Pinout & Package
Package: 16-lead plastic MSOP (3mm × 4.9mm, 0.65mm pitch), RoHS-compliant, rated for 0°C to 70°C operation (C-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDLBYP (1) | 2.5V LDO bypass | Internal regulator output for analog circuitry; requires 2.2µF ceramic capacitor to GND for noise suppression. |
| VDD (2) | Analog power supply | 5V main supply (4.75–5.25V); bypass with 10µF ceramic capacitor to ensure stable core operation. |
| GND (3,6,16) | Analog/digital ground | Three dedicated ground pins minimize ground bounce and improve PSRR in mixed-signal layout. |
| IN+ (4) | Pseudo-differential analog input | Accepts true bipolar signal up to ±10.24V relative to IN–; input impedance ~2kΩ with 45pF sampling capacitance. |
| IN– (5) | Common-mode reference input | Ground sense pin with ±500mV range; ties to remote ground plane to reject common-mode noise. |
| REFBUF (7) | Buffered reference output | 4.096V nominal output (2×REFIN); decoupled with 47µF ceramic capacitor; can be overdriven externally (2.5–5V). |
| REFIN (8) | Internal reference output / external reference input | 2.048V bandgap output (bypass with 100nF); accepts external 1.25–2.4V references for enhanced accuracy. |
| CNV (9) | Convert trigger | Rising-edge initiated conversion; powers up ADC and starts acquisition phase with deterministic timing. |
| CHAIN (10) | Interface mode selector | Low = normal mode (RDL/SDI = bus enable); high = daisy-chain mode (RDL/SDI = SDI input). |
| BUSY (11) | Conversion status indicator | Active-high signal indicates ongoing conversion; used for hardware handshaking or interrupt generation. |
| RDL/SDI (12) | Serial data control / input | Mode-dependent: bus enable (normal) or serial data input (chain); supports multi-device cascading. |
| SCK (13) | Serial clock input | Drives SPI data transfer; supports up to 100MHz clock (10ns period) for high-throughput readout. |
| SDO (14) | Serial data output | 2's complement 18-bit result shifted MSB-first on SCK rising edges; tri-state controlled by RDL/CHAIN. |
| OVDD (15) | I/O power supply | Digital interface supply (1.71–5.25V); sets logic thresholds and drives SDO/BUSY outputs. |
Key Features
| Feature | Design Value |
|---|---|
| True bipolar ±10.24V input range | Enables direct digitization of high-voltage industrial sensor outputs (e.g., ±10V transducers) without external level-shifting amplifiers. |
| No pipeline delay / zero cycle latency | Delivers immediate data availability after conversion completion - essential for closed-loop control and real-time triggering applications. |
| Onboard reference buffer with single-shot capability | Eliminates external op-amp buffering; supports fast wake-up (<200ms) and stable settling for intermittent acquisition modes. |
| Auto-nap between conversions | Reduces average power proportionally to sampling rate - extends battery life in portable instrumentation without firmware intervention. |
| Daisy-chain SPI interface | Allows synchronous readout of multiple LTC2326CMS-18#PBF devices using a single SCK/SDO line - cuts GPIO count and simplifies PCB routing in multi-channel systems. |
| Guaranteed operation to 125°C (H-grade variants) | Validated thermal robustness supports deployment in harsh environments like motor drives and downhole equipment (note: this part is C-grade, 0–70°C). |
Applications
| Programmable Logic Controllers | Industrial Process Control |
|---|---|
Use Scenario: High-accuracy analog input modules acquiring voltage signals from pressure, temperature, and flow sensors in factory automation cabinets. IC Role / Device Role / Timing Role: Primary 18-bit ADC digitizing ±10V field signals with minimal gain/offset drift over temperature and time. Use Value: ±5LSB INL and 95dB SNR ensure <0.002% measurement uncertainty - meeting SIL-2 functional safety requirements for critical loop monitoring. | Use Scenario: Distributed I/O nodes in chemical plant DCS systems measuring reactor thermocouple and strain gauge outputs. IC Role / Device Role / Timing Role: High-speed SAR ADC providing synchronized 250ksps sampling across multiple channels via daisy-chain SPI. Use Value: Internal 2.048V reference with 20ppm/°C drift eliminates need for external precision reference, reducing BOM cost and board area by ~30%. |
| High Speed Data Acquisition | Portable or Compact Instrumentation |
Use Scenario: Benchtop oscilloscopes and spectrum analyzers capturing transient waveforms with >100dB SFDR. IC Role / Device Role / Timing Role: Front-end ADC delivering 18-bit resolution at 250ksps with no missing codes and 7MHz analog bandwidth. Use Value: 95dB SNR and –111dB THD at 2kHz enable clean 32k-point FFT analysis - resolving spectral components separated by <0.03Hz. | Use Scenario: Battery-powered handheld multimeters and calibration standards requiring metrology-grade accuracy in compact enclosures. IC Role / Device Role / Timing Role: Low-power ADC operating in nap mode between measurements, activated only on user trigger or timer event. Use Value: 300μW sleep current extends 2xAA battery life to >12 months in intermittent-use scenarios while maintaining full 18-bit fidelity on demand. |
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 |
|---|---|---|---|
| AD7986BCPZ-RL7 | 18-bit, 1MSPS, ±10.24V range, external reference required, no integrated buffer, 20-lead LFCSP package | Higher speed but lacks onboard reference and buffer - requires additional components for same functionality | Select when >250ksps throughput is mandatory and board space allows external reference/buffer design. |
| ADS8860IDRCT | 16-bit, 1MSPS, ±5V range, internal reference, SPI interface, 10-lead VSSOP package | Lower resolution (16-bit) and narrower input range; optimized for lower power (15mW) and smaller footprint | Select when 16-bit resolution suffices and ultra-low power or minimal PCB area is prioritized over 18-bit fidelity. |
Compared with AD7986BCPZ-RL7, the LTC2326CMS-18#PBF reduces system complexity through its integrated 2.048V reference and 4.096V buffer, while ADS8860IDRCT trades 2-bit resolution and ±5V range for significantly lower power and smaller package - making LTC2326CMS-18#PBF optimal for precision industrial DAQ where reference stability and bipolar range are non-negotiable.
Availability
LTC2326CMS-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 manufacturability, and guaranteed C-grade temperature performance (0°C to 70°C).
Supply support for LTC2326CMS-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, formed through the acquisition of Linear Technology in 2017.
The LTC2326CMS-18#PBF belongs to ADI's precision SAR ADC product line, engineered specifically for industrial and instrumentation applications demanding high DC accuracy, low noise, and robust operation in electrically noisy environments.
FAQ
What is the absolute maximum input voltage rating for IN+ and IN– on the LTC2326CMS-18#PBF?
The absolute maximum analog input voltage for IN+ is –16.5V to +16.5V, and for IN– it is –0.5V to +0.5V relative to GND, per the Absolute Maximum Ratings table. These limits protect against damage during fault conditions but exceed recommended operating ranges; normal operation uses ±10.24V differential swing with IN– tied to ground or remote sense. Exceeding these values risks permanent device failure.
Does the LTC2326CMS-18#PBF require an external clock source for conversion timing?
No, the LTC2326CMS-18#PBF does not require an external clock source. It incorporates an internal oscillator that sets conversion time (tCONV = 1.9–3µs), eliminating external timing components and simplifying system design. The CNV pin triggers acquisition, and BUSY indicates completion - all timing is self-contained within LTC2326CMS-18#PBF.
Can the LTC2326CMS-18#PBF operate with a 3.3V OVDD supply while using a 5V VDD supply?
Yes, the LTC2326CMS-18#PBF supports independent supply domains: VDD = 4.75–5.25V for analog circuitry and OVDD = 1.71–5.25V for digital I/O. Using 3.3V OVDD with 5V VDD is explicitly supported and enables seamless interfacing with 3.3V microcontrollers or FPGAs while maintaining full analog performance - confirmed in Electrical Characteristics and Pin Functions sections.
How does the nap mode function in the LTC2326CMS-18#PBF, and what power savings does it provide?
The LTC2326CMS-18#PBF automatically enters nap mode between conversions, reducing supply current from 11.5mA (active) to ~0.1mA (nap), cutting power dissipation from 57.5mW to ~42mW at 250ksps. This dynamic scaling lowers average power in burst-mode or low-duty-cycle applications - a key advantage over fixed-consumption ADCs. Nap mode requires no software control and activates inherently after each conversion completes.
Is the LTC2326CMS-18#PBF pin-compatible with other members of the LTC2326 family, such as the LTC2326IMS-18#PBF?
Yes, the LTC2326CMS-18#PBF is pin-compatible with all variants in the LTC2326-18 family (e.g., LTC2326IMS-18#PBF, LTC2326HMS-18#PBF), sharing identical 16-lead MSOP packaging, pinout, and electrical interface. The only differences are temperature grade (C: 0–70°C, I: –40–85°C, H: –40–125°C) and part marking - enabling drop-in replacement during design-in or qualification without PCB revision.
LTC2326CMS-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:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2326CMS-18#PBF FAQ
1.How can I place an order for LTC2326CMS-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2326CMS-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 LTC2326CMS-18#PBF reliable?
The price and inventory of LTC2326CMS-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 LTC2326CMS-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2326CMS-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2326CMS-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2326CMS-18#PBF?
LTC2326CMS-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2326CMS-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 LTC2326CMS-18#PBF?
For technical support, including LTC2326CMS-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2326CMS-18#PBF requirements.
6.How does Aetrix verify that LTC2326CMS-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2326CMS-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 LTC2326CMS-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2326CMS-18#PBF?
All LTC2326CMS-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2326CMS-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 LTC2326CMS-18#PBF part is unused and in its original packaging.
Return procedure for LTC2326CMS-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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