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Analog Devices Inc. LTC2327IMS-18#PBF
- Part No.:
- LTC2327IMS-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2327IMS-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,459
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Product details
Overview
LTC2327IMS-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 delivers 95dB SNR, ±5LSB INL max, and no missing codes at full resolution. Designed for high-voltage industrial data acquisition, it operates from a single 5V supply with integrated 2.048V reference and reference buffer.
For engineers reviewing the LTC2327IMS-18#PBF datasheet, LTC2327IMS-18#PBF pinout, LTC2327IMS-18#PBF application, or LTC2327IMS-18#PBF equivalent, key selection criteria include guaranteed 18-bit no-missing-codes operation, daisy-chain SPI interface compatibility across 1.8V–5V logic, internal conversion clock, nap/sleep power management (36mW typical / 300μW sleep), and –40°C to +85°C industrial temperature rating.
Technical Context
The LTC2327IMS-18#PBF implements a charge-redistribution SAR architecture with a 2.048V internal bandgap reference buffered to 4.096V, enabling ±10.24V input range via 2.5× scaling. Its pseudo-differential input stage uses resistor-divider networks (2kΩ total impedance) and 45pF sampling capacitance to level-shift ±2.5×REFBUF into the ADC core's 0–REFBUF range.
Conversion timing is fully self-contained: a rising edge on CNV initiates acquisition (1.46μs), followed by 1.5μs conversion; no pipeline delay or cycle latency occurs. 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 guaranteed down to OVDD = 1.71V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - guarantees monotonic transfer function and no missing codes over full operating range. |
| Sampling Rate | 500ksps - enables real-time capture of signals up to 250kHz Nyquist bandwidth with minimal latency. |
| SNR | 95dB (typ) at fIN = 2kHz - supports >15.5 effective number of bits (ENOB) for precision measurement systems. |
| INL | ±5LSB (max) - ensures accurate representation of linear sensor outputs and control loop feedback without calibration. |
| Input Range | ±10.24V true bipolar - matches standard industrial voltage ranges (e.g., ±10V PLC I/O) without external level-shifting. |
| Power Dissipation | 36mW (typ) at 500ksps - scales with sample rate via automatic nap mode, reducing thermal load in dense PCB layouts. |
| Reference | 2.048V internal bandgap (20ppm/°C max drift) with onboard buffer - eliminates need for external reference IC in cost-sensitive designs. |
Pinout & Package
Package: 16-lead plastic MSOP (3mm × 4.9mm, 0.5mm pitch), rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 2) | Analog power supply | 5V ±2.5% input; powers ADC core and internal LDO generating VDDLBYP; requires 10µF ceramic bypass to GND. |
| IN+ (Pin 4), IN– (Pin 5) | Pseudo-differential analog inputs | Accept ±10.24V true bipolar signal; IN– serves as ground sense point with ±500mV range; common-mode rejection ≥66dB @ 250kHz. |
| REFBUF (Pin 7) | Buffered reference output | Nominally 4.096V (2×REFIN); decoupled with 47µF ceramic capacitor; can be overdriven externally (2.5V–5V) to scale input range. |
| REFIN (Pin 8) | Internal reference output / external reference input | 2.048V ±5mV bandgap output; bypassed with 100nF ceramic; accepts 1.25V–2.4V external reference for improved accuracy. |
| CNV (Pin 9) | Convert trigger input | Rising-edge–activated; powers up ADC and starts acquisition/conversion sequence; logic levels referenced to OVDD. |
| CHAIN (Pin 10) | Interface mode selector | Low = normal mode (RDL/SDI = bus enable); high = daisy-chain mode (RDL/SDI = serial data input). |
| BUSY (Pin 11) | Conversion status indicator | Active-high open-drain output signaling conversion in progress; synchronized to CNV edge; used for timing handshaking. |
| RDL/SDI (Pin 12) | Configurable serial interface pin | Function depends on CHAIN state; enables SDO output or accepts daisy-chain input; 5V-tolerant when OVDD ≤ 5.25V. |
| SCK (Pin 13) | Serial clock input | Drives SPI data transfer; supports up to 100MHz clock (10ns period); timing parameters guaranteed across 1.71V–5.25V OVDD. |
| SDO (Pin 14) | Serial data output | 2's complement 18-bit result shifted MSB-first on SCK rising edges; tri-state controlled by RDL/SDI in normal mode. |
| OVDD (Pin 15) | Digital I/O supply | 1.71V–5.25V logic interface supply; sets VIH/VIL thresholds; bypassed with 0.1µF ceramic capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| No missing codes at 18 bits | Guaranteed monotonicity over full temperature range (–40°C to +85°C), eliminating code ambiguity in closed-loop control. |
| True bipolar ±10.24V input | Direct interface to industrial sensors and transducers without external op-amp level-shifting circuitry or dual supplies. |
| Onboard reference buffer | Single-shot capable 4.096V output with 20ppm/°C max drift; reduces BOM count and layout complexity vs. discrete reference solutions. |
| Daisy-chain SPI mode | Enables synchronous multi-channel acquisition with single SCK/SCKCH line and shared BUSY timing - ideal for modular DAQ systems. |
| Automatic nap mode | Reduces dynamic power proportionally to sampling rate; cuts current draw between conversions without software intervention. |
| –40°C to +85°C operation | Qualified for industrial environments including factory automation, process control, and test equipment with extended thermal margins. |
Applications
| Programmable Logic Controllers | Industrial Process Control |
|---|---|
Use Scenario: High-accuracy analog input module measuring 4–20mA current loops and ±10V sensor outputs in harsh factory environments. IC Role / Device Role / Timing Role: Primary ADC digitizing field signals with 18-bit resolution and true bipolar support for bidirectional flow/pressure sensing. Use Value: Eliminates external signal conditioning for ±10.24V inputs, reduces calibration overhead via ±5LSB INL, and sustains performance across –40°C to +85°C ambient. |
Use Scenario: Distributed control system (DCS) I/O card acquiring thermocouple, RTD, and strain gauge signals with low THD and high SNR. IC Role / Device Role / Timing Role: Precision SAR ADC providing synchronized sampling for multi-sensor feedback in PID control loops. Use Value: 95dB SNR and –111dB THD enable detection of sub-millivolt-level process deviations; daisy-chain mode simplifies multi-channel board design. |
| High Speed Data Acquisition | ATE |
Use Scenario: Portable oscilloscope front-end capturing transient waveforms up to 250kHz with minimal aliasing and distortion. IC Role / Device Role / Timing Role: Core sampling element delivering 500ksps throughput with zero cycle latency and deterministic timing. Use Value: Internal oscillator removes external clock routing; nap mode lowers average power during idle periods without sacrificing acquisition speed. |
Use Scenario: Automated test equipment channel card performing parametric testing on analog ICs and power devices. IC Role / Device Role / Timing Role: Metrology-grade ADC validating DUT performance against tight DC and AC specifications (INL, SNR, THD). Use Value: Guaranteed 18-bit no-missing-codes operation ensures full dynamic range utilization; ±5LSB INL supports <0.01% gain error tolerance in calibration fixtures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed precision SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7606C-18 | 8-channel simultaneous sampling, ±10V input, 200ksps per channel, internal reference, parallel + SPI interface | Multi-channel synchronized acquisition; higher channel density but lower per-channel throughput than LTC2327IMS-18#PBF | Select AD7606C-18 when simultaneous sampling across ≥2 channels is required; LTC2327IMS-18#PBF preferred for single-channel 500ksps or daisy-chained modular systems. |
| ADS8860 | 16-bit, 1MSPS, pseudo-differential, ±VREF input, external reference only, no internal buffer, 2.5V supply | Higher speed but reduced resolution and dynamic range; lacks integrated reference and bipolar input flexibility | Select ADS8860 for cost-sensitive, battery-powered applications needing >500ksps with 16-bit resolution; LTC2327IMS-18#PBF provides superior SNR, INL, and ease-of-use for industrial voltage ranges. |
Compared with AD7606C-18 and ADS8860, the LTC2327IMS-18#PBF uniquely combines single-channel 500ksps speed, 18-bit no-missing-codes assurance, ±10.24V true bipolar input, and integrated reference buffer-making it optimal for space-constrained, high-accuracy industrial DAQ where channel count is secondary to precision and simplicity.
Availability
LTC2327IMS-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 with guaranteed long-term availability and traceable sourcing.
Supply support for LTC2327IMS-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, formed through the acquisition of Linear Technology in 2017.
The LTC2327IMS-18#PBF belongs to ADI's precision SAR ADC product line, engineered for industrial, instrumentation, and test equipment applications demanding high resolution, low noise, and robust operation across extended temperature ranges.
FAQ
What is the operating temperature range of the LTC2327IMS-18#PBF?
The LTC2327IMS-18#PBF is specified for operation from –40°C to +85°C (industrial grade). This is confirmed in the Order Information table and Absolute Maximum Ratings section of the datasheet, where "I" grade denotes the –40°C to +85°C range. The device maintains full performance-including 95dB SNR and ±5LSB INL-across this entire range.
Does the LTC2327IMS-18#PBF require an external reference?
No, the LTC2327IMS-18#PBF does not require an external reference. It integrates a factory-trimmed 2.048V bandgap reference and a 2× gain reference buffer, delivering a stable 4.096V output at REFBUF (Pin 7) to support the ±10.24V input range. External references are optional for enhanced accuracy or drift performance.
How does the daisy-chain mode work on the LTC2327IMS-18#PBF?
In daisy-chain mode (enabled by pulling CHAIN high), the LTC2327IMS-18#PBF accepts serial data on RDL/SDI (Pin 12) and shifts its own 18-bit result out on SDO (Pin 14) synchronously with SCK. Multiple devices share one SCK line and propagate data serially, enabling synchronized multi-channel acquisition without additional control lines.
What power savings does the nap mode provide for the LTC2327IMS-18#PBF?
The nap mode reduces LTC2327IMS-18#PBF supply current between conversions: from 18.6mA (VDD + OVDD) at 500ksps to ~10mA during acquisition hold. Sleep mode further drops total current to 300μA. This dynamic scaling lowers average power and thermal dissipation in battery- or thermally constrained systems.
Is the LTC2327IMS-18#PBF pin-compatible with other members of the LTC2327 family?
Yes, all LTC2327-x variants-including LTC2327CMS-18#PBF (0°C to 70°C), LTC2327IMS-18#PBF (–40°C to 85°C), and LTC2327HMS-18#PBF (–40°C to 125°C)-share identical 16-lead MSOP packaging and pinout. Only the temperature grade and part marking differ; no PCB redesign is needed when upgrading grades.
LTC2327IMS-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:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2327IMS-18#PBF FAQ
1.How can I place an order for LTC2327IMS-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2327IMS-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 LTC2327IMS-18#PBF reliable?
The price and inventory of LTC2327IMS-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 LTC2327IMS-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2327IMS-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2327IMS-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2327IMS-18#PBF?
LTC2327IMS-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2327IMS-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 LTC2327IMS-18#PBF?
For technical support, including LTC2327IMS-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2327IMS-18#PBF requirements.
6.How does Aetrix verify that LTC2327IMS-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2327IMS-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 LTC2327IMS-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2327IMS-18#PBF?
All LTC2327IMS-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2327IMS-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 LTC2327IMS-18#PBF part is unused and in its original packaging.
Return procedure for LTC2327IMS-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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