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Analog Devices Inc. LTC2328CMS-18#PBF
- Part No.:
- LTC2328CMS-18#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2328CMS-18#PBF.pdf
- Description:
- IC ADC 18BIT SAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,945
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Product details
Overview
LTC2328CMS-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, 1 Msps successive approximation register (SAR) analog-to-digital converter with pseudo-differential inputs and true bipolar ±10.24V input range. It features ±5 LSB INL (max), 95 dB SNR (typ), and operates from a single 5 V supply. Its onboard 2.048 V low-drift reference and SPI-compatible serial interface make it suitable for high-precision industrial data acquisition systems requiring wide dynamic range and low latency.
For engineers reviewing the LTC2328CMS-18#PBF datasheet, LTC2328CMS-18#PBF pinout, LTC2328CMS-18#PBF application, or LTC2328CMS-18#PBF equivalent, key selection considerations include guaranteed 18-bit no-missing-codes operation, internal reference buffer capability, daisy-chain SPI mode, 7 MHz –3 dB input bandwidth, and support for 1.8 V to 5 V I/O logic levels across temperature ranges up to 125°C.
Technical Context
The LTC2328CMS-18#PBF implements a charge-redistribution SAR architecture with a 2.048 V internal bandgap reference buffered to 4.096 V, enabling ±10.24 V full-scale input swing. Its pseudo-differential input stage uses resistor-divider networks and back-to-back ESD diodes, with 2 kΩ input impedance and 45 pF sampling capacitance.
Conversion timing is governed by an internal oscillator (tCONV = 460–527 ns), eliminating external clock dependencies. The device supports three reference configurations: internal reference only, externally overdriven REFIN (1.25–2.4 V), or externally overdriven REFBUF (2.5–5 V), each yielding distinct bipolar input ranges (±6.25 V, ±10.24 V, or ±12.5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit - guarantees monotonic transfer function and no missing codes across full operating temperature range. |
| Sampling Rate | 1 Msps - enables real-time capture of signals up to 500 kHz Nyquist bandwidth without pipeline delay or cycle latency. |
| INL (Max) | ±5 LSB - ensures accurate DC measurement linearity within ±0.0019% of full scale for calibration-sensitive applications. |
| SNR (Typ) | 95 dB at fIN = 2 kHz - delivers 15.8 effective bits (ENOB) for high-fidelity signal reconstruction in instrumentation. |
| Reference | 2.048 V internal bandgap (20 ppm/°C max drift) with onboard buffer - eliminates need for external reference components in most designs. |
| Power Dissipation | 50 mW at 1 Msps (Nap mode); 300 µW in Sleep mode - scales dynamically with sample rate to reduce thermal load in portable or thermally constrained systems. |
| Supply Voltage | VDD = 4.75–5.25 V; OVDD = 1.71–5.25 V - supports mixed-voltage digital interfacing (1.8 V/2.5 V/3.3 V/5 V) while maintaining analog performance. |
Pinout & Package
Package: 16-lead plastic MSOP (3 mm × 4.9 mm, 0.65 mm pitch), RoHS-compliant, rated for 0°C to 70°C ambient (C-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDLBYP (1) | 2.5 V regulated bypass | On-chip LDO output; requires 2.2 µF ceramic capacitor to GND for stable internal analog rail generation. |
| VDD (2) | Main analog power supply | 5 V ±5% input; powers ADC core and reference; must be decoupled with 10 µF ceramic capacitor. |
| GND (3, 6, 16) | Analog/digital ground | Three dedicated ground pins minimize ground bounce and improve PSRR; all must connect to low-impedance ground plane. |
| IN+ (4) | Pseudo-differential analog input (+) | Accepts true bipolar voltage from –2.5×VREFBUF to +2.5×VREFBUF; input impedance ≈2 kΩ; drives CDAC sampling network. |
| IN– (5) | Pseudo-differential analog input (–) | Common-mode sense node; ±500 mV range w.r.t. GND; ties to remote ground or system reference point. |
| REFBUF (7) | Reference buffer output | Nominally 4.096 V; can be overdriven externally (2.5–5 V) to set input range; requires ≥47 µF ceramic decoupling. |
| REFIN (8) | Internal reference output / external reference input | 2.048 V bandgap output (15 kΩ series resistance); accepts 1.25–2.4 V external reference for improved accuracy. |
| CNV (9) | Convert trigger input | Rising-edge–activated; initiates acquisition and conversion; logic threshold defined by OVDD voltage. |
| CHAIN (10) | Daisy-chain mode select | High = chain mode (RDL/SDI becomes SDI); Low = normal mode (RDL/SDI enables SDO bus). |
| BUSY (11) | Conversion status indicator | Active-high open-drain output; asserts at CNV↑, deasserts when 18-bit result is ready on SDO. |
| RDL/SDI (12) | Bus enable / serial data input | In normal mode: controls SDO tri-state; in chain mode: receives serial data from upstream ADC. |
| SCK (13) | Serial clock input | Drives SPI interface; supports up to 100 MHz (10 ns period); rising edge clocks out MSB-first 2's complement data. |
| SDO (14) | Serial data output | Tri-state CMOS output; delivers 18-bit conversion result or daisy-chain data; compatible with 1.8–5 V host logic. |
| OVDD (15) | I/O interface power supply | Defines logic thresholds for all digital pins; independent of VDD; enables mixed-signal voltage domain isolation. |
Key Features
| Feature | Design Value |
|---|---|
| No missing codes at 18 bits | Guaranteed monotonicity across full temperature range (0°C to 70°C), eliminating code ambiguities in closed-loop control. |
| True bipolar ±10.24 V input | Supports direct measurement of AC-coupled or floating high-voltage signals without external level-shifting circuitry. |
| Onboard reference buffer | Single-shot capable 4.096 V output reduces BOM count and layout complexity versus discrete reference + op-amp solutions. |
| Daisy-chain SPI mode | Enables synchronous multi-channel sampling with minimal GPIO usage-ideal for compact PLC or DAQ modules. |
| Auto Nap and Sleep modes | Reduces average power by >99% during idle periods while retaining full wake-up readiness (<200 ms REFBUF stabilization). |
| 7 MHz –3 dB input bandwidth | Preserves fidelity of fast transients and harmonics up to 5th order in motor current or vibration sensing applications. |
Applications
| Programmable Logic Controllers | Industrial Process Control |
|---|---|
Use Scenario: High-accuracy analog input module for monitoring 4–20 mA loop sensors, thermocouples, and strain gauges in factory automation cabinets. IC Role / Device Role / Timing Role: Primary SAR ADC digitizing ±10.24 V sensor outputs at 1 Msps with deterministic latency for real-time PID execution. Use Value: Eliminates external signal conditioning for bipolar industrial sensors, reducing component count and improving long-term stability via integrated 20 ppm/°C reference. |
Use Scenario: Distributed I/O node acquiring pressure, flow, and temperature data from field instruments in oil & gas refineries. IC Role / Device Role / Timing Role: Precision ADC front-end with daisy-chain SPI supporting synchronized sampling across multiple sensor channels. Use Value: Enables time-aligned multi-sensor capture without external clock distribution, critical for cross-variable correlation in predictive maintenance algorithms. |
| High Speed Data Acquisition | Portable or Compact Instrumentation |
Use Scenario: Benchtop oscilloscope or spectrum analyzer capturing transient waveforms up to 500 kHz with 15.8 ENOB resolution. IC Role / Device Role / Timing Role: Core ADC delivering 1 Msps throughput with zero cycle latency and no pipeline delay for real-time FFT processing. Use Value: Achieves 95 dB SNR at 2 kHz without external anti-aliasing filters, simplifying front-end design while preserving signal integrity. |
Use Scenario: Handheld power quality analyzer measuring voltage/current harmonics in electrical distribution panels. IC Role / Device Role / Timing Role: Low-power 18-bit ADC operating in Nap mode between samples to extend battery life while maintaining full-speed burst capability. Use Value: 50 mW active power and 300 µW sleep current enable >8-hour runtime on Li-ion packs, meeting portable test equipment energy budgets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed precision ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7641ASTZ | 18-bit, 2 Msps SAR ADC; requires external reference; no integrated REFBUF; 20-lead TSSOP package. | Higher speed but lacks internal reference buffer and true bipolar ±10.24 V input - demands additional reference and driver circuitry. | Select when maximum throughput (2 Msps) is prioritized over BOM simplicity and board space constraints. |
| LTC2327IMS-18#PBF | 18-bit, 500 ksps variant; identical pinout, reference architecture, and feature set; lower power (32 mW at 500 ksps). | Half the sampling rate; suitable for cost-optimized or lower-bandwidth industrial sensors where 1 Msps is unnecessary. | Select when system requirements allow reduced sample rate to lower power consumption and thermal dissipation. |
Compared with AD7641ASTZ, LTC2328CMS-18#PBF reduces design complexity through integrated reference buffering and true bipolar input scaling, while LTC2327IMS-18#PBF offers identical functionality at half the speed and power-enabling scalable platform design across performance tiers.
Availability
LTC2328CMS-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 assurance, and traceable sourcing.
Supply support for LTC2328CMS-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 LTC2328CMS-18#PBF belongs to ADI's precision SAR ADC product line, engineered for demanding industrial and instrumentation applications requiring high resolution, low noise, and robust operation across extended temperature ranges.
FAQ
What is the guaranteed operating temperature range for the LTC2328CMS-18#PBF?
The LTC2328CMS-18#PBF is specified for 0°C to 70°C ambient operation (C-grade). This is confirmed in the Order Information table and Absolute Maximum Ratings section of the datasheet. It is distinct from the I-grade (–40°C to 85°C) and H-grade (–40°C to 125°C) variants, which carry different part number suffixes (IMS-18 and HMS-18).
Does the LTC2328CMS-18#PBF require an external reference, or does it include one?
The LTC2328CMS-18#PBF includes a factory-trimmed 2.048 V internal bandgap reference with ≤20 ppm/°C drift and an onboard reference buffer that outputs 4.096 V. This enables a ±10.24 V true bipolar input range without external components. However, REFIN and REFBUF pins support external overdrive for enhanced accuracy or alternative input ranges.
Can the LTC2328CMS-18#PBF interface directly with a 1.8 V microcontroller?
Yes. The LTC2328CMS-18#PBF supports 1.8 V to 5 V logic levels via its OVDD supply pin. When OVDD = 1.8 V, all digital inputs (CNV, CHAIN, RDL/SDI, SCK) recognize 0.2×OVDD and 0.8×OVDD thresholds, and the SDO output drives compliant 1.8 V logic - enabling direct connection to low-voltage MCUs without level shifters.
What is the meaning of "pseudo-differential" input in the LTC2328CMS-18#PBF?
Pseudo-differential operation means the LTC2328CMS-18#PBF measures the voltage difference between IN+ and IN–, but IN– is not actively driven-it serves as a common-mode sense node referenced to GND (±500 mV range). This architecture rejects common-mode noise while simplifying sensor interfacing compared to fully differential ADCs requiring matched driver pairs.
How does the Nap mode function in the LTC2328CMS-18#PBF, and what is its impact on power?
The LTC2328CMS-18#PBF automatically enters Nap mode between conversions, reducing supply current from ~24 mA (active) to ~10 mA (Nap), cutting power dissipation from 72.5 mW to 42 mW at 1 Msps. This dynamic scaling lowers thermal load and improves long-term reliability without compromising conversion readiness or timing determinism.
LTC2328CMS-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):
- 1M
- 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:
- -
LTC2328CMS-18#PBF FAQ
1.How can I place an order for LTC2328CMS-18#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2328CMS-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 LTC2328CMS-18#PBF reliable?
The price and inventory of LTC2328CMS-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 LTC2328CMS-18#PBF is usually 5 days.
3.What payment methods are accepted for LTC2328CMS-18#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2328CMS-18#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2328CMS-18#PBF?
LTC2328CMS-18#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2328CMS-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 LTC2328CMS-18#PBF?
For technical support, including LTC2328CMS-18#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2328CMS-18#PBF requirements.
6.How does Aetrix verify that LTC2328CMS-18#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2328CMS-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 LTC2328CMS-18#PBF meets industry standards.
7.What is the process for return or replacement of LTC2328CMS-18#PBF?
All LTC2328CMS-18#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2328CMS-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 LTC2328CMS-18#PBF part is unused and in its original packaging.
Return procedure for LTC2328CMS-18#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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