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Analog Devices Inc. LTC2327CMS-18#PBF
- Part No.:
- LTC2327CMS-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2327CMS-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,832
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Product details
Overview
LTC2327CMS-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, 500ksps successive approximation register (SAR) analog-to-digital converter with pseudo-differential inputs and true bipolar ±10.24V input range. It features 95dB SNR, ±5LSB INL max, no missing codes at 18 bits, and operates from a single 5V supply. It is used in high-speed industrial data acquisition systems requiring wide dynamic range and low distortion.
For engineers reviewing the LTC2327CMS-18#PBF datasheet, LTC2327CMS-18#PBF pinout, LTC2327CMS-18#PBF application, or LTC2327CMS-18#PBF equivalent, key selection criteria include guaranteed 18-bit no-missing-codes operation, internal 2.048V reference with 20ppm/°C drift, SPI-compatible daisy-chain interface, 500ksps throughput with zero cycle latency, and MSOP-16 packaging for space-constrained PCB layouts.
Technical Context
The LTC2327CMS-18#PBF implements a charge-redistribution SAR architecture with internal oscillator timing, eliminating external clock dependency. Its pseudo-differential input stage uses resistor divider networks to level-shift ±2.5×REFBUF signals into the ADC core's 0–REFBUF range while maintaining common-mode rejection up to 66dB at 250kHz.
It integrates a single-shot-capable reference buffer delivering 4.096V (2×2.048V), supports 1.8V–5V I/O logic via OVDD, and provides three reference configuration modes: internal reference only, externally overdriven REFIN with internal buffer, or externally overdriven REFBUF with internal reference disabled - enabling flexible ±6.25V, ±10.24V, or ±12.5V input ranges.
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 | 500ksps maximum - enables real-time capture of signals up to ~240kHz Nyquist bandwidth. |
| SNR | 95dB typical at fIN = 2kHz - supports >15.5 effective number of bits (ENOB) for high-fidelity signal digitization. |
| INL | ±5LSB maximum - limits integral nonlinearity error to <0.002% of full scale, critical for calibration-sensitive applications. |
| Input Range | True bipolar ±10.24V - accommodates legacy industrial sensor outputs without external level-shifting circuitry. |
| Power Dissipation | 36mW typical at 500ksps - scales with sampling rate and includes automatic nap mode between conversions. |
| Reference | Internal 2.048V bandgap with 20ppm/°C max drift - eliminates need for external precision reference in many applications. |
Pinout & Package
Package: 16-lead plastic MSOP (3mm × 4.9mm, 0.65mm pitch), rated for 0°C to 70°C operating temperature (C-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDLBYP (1) | 2.5V regulated bypass | On-chip LDO output; requires 2.2μF ceramic capacitor to GND for stable internal bias generation. |
| VDD (2) | Main analog supply | 4.75V–5.25V input; powers ADC core and reference; bypass with 10μF ceramic capacitor. |
| 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; differential swing relative to IN– is –2.5×REFBUF to +2.5×REFBUF. |
| IN– (5) | Common-mode sense input | ±500mV range w.r.t. GND; must connect to system ground or remote sense point for accurate CMRR. |
| REFBUF (7) | Reference buffer output | Nominally 4.096V; decoupled with 47μF ceramic capacitor; can be overdriven externally (2.5V–5V) when REFIN = 0V. |
| REFIN (8) | Internal reference output / external reference input | 2.048V ±5mV; bypass with 100nF ceramic; accepts 1.25V–2.4V external reference for enhanced accuracy. |
| CNV (9) | Convert trigger | Rising edge initiates conversion and powers up ADC; logic levels referenced to OVDD. |
| CHAIN (10) | Daisy-chain mode select | High enables SPI daisy-chain mode; low configures RDL/SDI as bus enable control. |
| BUSY (11) | Conversion status indicator | Active-high during conversion; transitions low when 18-bit result is ready for serial readout. |
| RDL/SDI (12) | Serial bus enable / data input | In normal mode: controls SDO tri-state; in chain mode: receives serial data from upstream device. |
| SCK (13) | Serial clock input | Supports up to 100MHz clock (10ns period); rising edge clocks out MSB-first 2's complement data on SDO. |
| SDO (14) | Serial data output | Tri-state capable; outputs 18-bit conversion result or daisy-chain data; logic levels referenced to OVDD. |
| OVDD (15) | I/O interface supply | 1.71V–5.25V digital interface supply; sets logic thresholds for all digital pins; bypass with 0.1μF ceramic. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay or cycle latency | Enables deterministic real-time control loops with immediate access to latest conversion result after BUSY goes low. |
| Internal conversion clock | Removes dependency on external timing sources, simplifying system clock tree design and reducing jitter sensitivity. |
| Auto nap mode between conversions | Reduces average power consumption proportionally to sampling rate - e.g., 100ksps yields ~7mW instead of 36mW. |
| SPI-compatible interface with daisy-chain support | Allows multi-channel synchronization using single SCK and CNV lines across multiple LTC2327 devices without additional GPIO. |
| True bipolar ±10.24V input range | Directly interfaces with ±10V industrial sensors and PLC analog I/O modules without external op-amp gain/level-shift stages. |
Applications
| Programmable Logic Controllers | Industrial Process Control |
|---|---|
Use Scenario: High-accuracy analog input module in modular PLC chassis acquiring voltage signals from pressure, temperature, and flow transmitters. IC Role / Device Role / Timing Role: Primary 18-bit ADC digitizing ±10V sensor outputs with synchronized sampling across multiple channels via daisy-chain SPI. Use Value: Eliminates external signal conditioning for standard industrial voltage ranges and maintains <±5LSB linearity across 0°C–70°C ambient. | Use Scenario: Distributed I/O node in refinery DCS measuring reactor temperature gradients using thermocouple amplifiers with ±10.24V output swing. IC Role / Device Role / Timing Role: Precision SAR ADC providing 95dB SNR and 500ksps throughput for closed-loop feedback control with minimal latency. Use Value: Internal 2.048V reference with 20ppm/°C drift ensures long-term calibration stability without field recalibration. |
| High Speed Data Acquisition | Portable Instrumentation |
Use Scenario: Benchtop oscilloscope front-end capturing transient waveforms from power electronics with 240kHz effective bandwidth. IC Role / Device Role / Timing Role: High-speed ADC with zero-cycle latency and deterministic BUSY timing for precise trigger alignment and waveform reconstruction. Use Value: 36mW power at full rate and 300μW sleep mode enable battery-powered portable DAQ with >8-hour runtime. | Use Scenario: Handheld multimeter or power quality analyzer requiring compact size, low self-heating, and metrology-grade linearity. IC Role / Device Role / Timing Role: Core ADC in battery-operated instrument where MSOP-16 footprint minimizes PCB area and thermal mass. Use Value: Guaranteed 18-bit no-missing-codes performance ensures unambiguous resolution of small signal changes even near zero-crossing points. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7606C-18 | 8-channel simultaneous sampling, ±10V input, 200ksps per channel, internal reference 4.096V, 2.5V/3.3V I/O only | Integrated multiplexer and simultaneous sampling ideal for multi-sensor phase-coherent acquisition; lower throughput per channel | Select when multi-channel synchronization and reduced external component count outweigh single-channel speed advantage |
| ADS8860 | 16-bit, 1MSPS, ±VREF input (external reference required), SPI interface, 3.3V-only I/O, 10-pin VSSOP package | Higher speed but reduced resolution and no internal reference - requires external 2.048V/4.096V reference and level-shifting for ±10V inputs | Select when system already provides precision reference and prioritizes sampling rate over ENOB and ease of use |
Compared with AD7606C-18 and ADS8860, the LTC2327CMS-18#PBF delivers superior 18-bit integrity with no missing codes, integrated ±10.24V bipolar range, and flexible 1.8V–5V I/O - making it optimal for single-channel, high-accuracy, low-latency industrial measurement where board space and reference simplicity are critical.
Availability
LTC2327CMS-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 LTC2327CMS-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 LTC2327CMS-18#PBF belongs to ADI's precision SAR ADC product line, designed specifically for industrial automation, test equipment, and energy monitoring applications demanding high resolution, low noise, and robust operation in harsh environments.
FAQ
What is the guaranteed operating temperature range for the LTC2327CMS-18#PBF?
The LTC2327CMS-18#PBF is specified for 0°C to 70°C operation (C-grade). This is confirmed by the "CMS" suffix and Order Information table, which lists "0°C to 70°C" under Temperature Range for part number LTC2327CMS-18#PBF. The device achieves full performance including ±5LSB INL and 95dB SNR across this range.
Does the LTC2327CMS-18#PBF require an external reference, or does it include one?
The LTC2327CMS-18#PBF includes a factory-trimmed 2.048V internal bandgap reference with ≤20ppm/°C drift and an onboard reference buffer that outputs 4.096V. No external reference is required for ±10.24V operation. However, REFIN can be overdriven (1.25V–2.4V) for improved accuracy, or REFBUF can be overdriven (2.5V–5V) with REFIN = 0V for extended input ranges.
How does the daisy-chain mode work on the LTC2327CMS-18#PBF?
Daisy-chain mode is enabled by pulling CHAIN (Pin 10) high. In this mode, RDL/SDI becomes SDI (serial data input), accepting data from the SDO of a preceding device. SDO outputs the local conversion result or passes upstream data. A single SCK and CNV control multiple devices, enabling synchronized sampling and reduced GPIO usage in multi-ADC systems.
What is the power consumption of the LTC2327CMS-18#PBF at 500ksps, and how does it scale with lower sampling rates?
At 500ksps, the LTC2327CMS-18#PBF consumes 36mW typical (11.4mA VDD + 7.2mA OVDD). Power scales linearly with sampling rate due to automatic nap mode between conversions - e.g., at 100ksps, total current drops to ~3.5mA, reducing power to ~7mW. Sleep mode further reduces consumption to 300μW when inactive.
Can the LTC2327CMS-18#PBF interface directly with a 1.8V microcontroller SPI port?
Yes. The LTC2327CMS-18#PBF supports 1.8V–5V logic levels via the OVDD pin (Pin 15). When OVDD = 1.8V, all digital inputs (CNV, CHAIN, RDL/SDI, SCK) recognize 0.36V/1.44V thresholds, and digital outputs (BUSY, SDO) drive to 1.6V/0.2V levels - ensuring full compatibility with 1.8V SPI peripherals without level shifters.
LTC2327CMS-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):
- 500k
- 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:
- -
LTC2327CMS-18#PBF FAQ
1.How can I place an order for LTC2327CMS-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2327CMS-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 LTC2327CMS-18#PBF reliable?
The price and inventory of LTC2327CMS-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 LTC2327CMS-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2327CMS-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2327CMS-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2327CMS-18#PBF?
LTC2327CMS-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2327CMS-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 LTC2327CMS-18#PBF?
For technical support, including LTC2327CMS-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2327CMS-18#PBF requirements.
6.How does Aetrix verify that LTC2327CMS-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2327CMS-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 LTC2327CMS-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2327CMS-18#PBF?
All LTC2327CMS-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2327CMS-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 LTC2327CMS-18#PBF part is unused and in its original packaging.
Return procedure for LTC2327CMS-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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