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Analog Devices Inc. LTC2381IDE-16#PBF
- Part No.:
- LTC2381IDE-16#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC2381IDE-16#PBF.pdf
- Description:
- IC ADC 16BIT SAR 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,504
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Product details
Overview
LTC2381IDE-16#PBF from Analog Devices (acquired Linear Technology) is a 16-bit, 250ksps successive approximation register (SAR) analog-to-digital converter with fully differential ±2.5V input range, 92dB SNR at 20kHz, ±2LSB INL max, and 3.25mW power consumption at full throughput. It operates from a single 2.5V supply and supports SPI-compatible serial interface with daisy-chain mode for high-speed data acquisition in portable instrumentation.
For engineers reviewing the LTC2381IDE-16#PBF datasheet, LTC2381IDE-16#PBF pinout, LTC2381IDE-16#PBF application, or LTC2381IDE-16#PBF equivalent, key selection considerations include guaranteed 16-bit no-missing-codes operation, extended 3.25µs acquisition time enabling low-power ADC drivers, internal conversion clock eliminating external timing constraints, and –40°C to +85°C industrial temperature rating in 4mm × 3mm DFN package.
Technical Context
The LTC2381IDE-16#PBF implements a proprietary sampling architecture that initiates acquisition of the next sample during the current conversion cycle, achieving 3.25µs acquisition time and eliminating pipeline delay. Its SAR core uses a 16-bit CDAC with differential comparator referenced to an external 2.5V source, delivering true bipolar 2's complement output codes.
Conversion is triggered by a rising edge on CNV; BUSY goes high during conversion and returns low upon completion. The SPI-compatible serial interface supports 1.8V–5V I/O logic levels via OVDD, includes RDL/SDI dual-function pin for normal/chain modes, and outputs MSB-first 16-bit data on SDO synchronized to SCK rising edges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees full 65,536 code resolution with no missing codes across temperature. |
| Sampling Rate | 250ksps - enables real-time capture of signals up to 125kHz Nyquist bandwidth. |
| INL (Max) | ±2LSB - ensures monotonicity and <0.003% full-scale linearity error for precision measurement. |
| SNR (Typ) | 92dB at fIN=20kHz - delivers 15.3 effective bits (ENOB) for high-fidelity signal digitization. |
| Power (250ksps) | 3.25mW - reduces thermal load and extends battery life in portable systems. |
| Input Range | ±2.5V differential - supports wide dynamic range without external gain scaling. |
| Acquisition Time | 3.25µs - allows use of ultra-low-power op-amps (e.g., LT6350) as input drivers. |
Pinout & Package
Package: 16-lead (4mm × 3mm) plastic DFN with exposed pad (Pin 17), rated for –40°C to +85°C operation. Exposed pad must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CHAIN (1) | Mode selector | High enables daisy-chain serial input (SDI); low enables bus-enable function (RDL). |
| VDD (2) | Digital supply | 2.375V–2.625V supply for core logic; requires 10µF ceramic bypass to GND. |
| GND (3,6,10,16) | Ground reference | Four dedicated ground pins minimize noise coupling between analog/digital sections. |
| IN+, IN– (4,5) | Differential analog inputs | Accept ±2.5V input range; 45pF sampling capacitance requires low-Z driver for settling. |
| REF (7,8) | Reference input | 2.4V–2.6V external reference; draws 285µA at 250ksps; requires 47µF X5R capacitor. |
| CNV (9) | Convert trigger | Rising edge initiates conversion; high state enables auto power-down between conversions. |
| BUSY (11) | Status indicator | Active-high open-drain signal indicating conversion in progress. |
| RDL/SDI (12) | Serial control/data | In Normal Mode: bus enable; in Chain Mode: serial data input for daisy-chained ADCs. |
| SCK (13) | Serial clock | Accepts 10ns min period (100MHz max); controls SDO data output timing. |
| SDO (14) | Serial data output | MSB-first 2's complement 16-bit result; tri-state when RDL=low or CHAIN=low. |
| OVDD (15) | I/O supply | 1.71V–5.25V logic-level supply; sets VIH/VIL thresholds for SPI interface compatibility. |
| GND (17) | Exposed pad | Thermal and electrical ground connection; mandatory soldering required for spec compliance. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Zero-cycle latency enables deterministic real-time control loop response. |
| Auto power-down | Reduces current to 0.5µA between conversions, scaling power linearly with sampling rate. |
| SPI-compatible interface | Supports 1.8V/2.5V/3.3V/5V logic without level shifters, simplifying host MCU integration. |
| Daisy-chain mode | Enables synchronous multi-channel acquisition with single SCK/SDO bus, reducing PCB routing. |
| Extended acquisition time | 3.25µs window allows use of sub-1mA quiescent current amplifiers (e.g., LT6350) without distortion penalty. |
| Guaranteed operation to 85°C | Validated performance over full industrial temperature range without derating. |
Applications
| Medical Imaging Signal Chain | Industrial Process Monitoring |
|---|---|
Use Scenario: Digitizing low-amplitude ultrasound echo signals in portable diagnostic equipment with strict power budgets. IC Role / Device Role / Timing Role: Primary SAR ADC capturing 20kHz–10MHz band-limited signals with 92dB SNR and no missing codes. Use Value: 3.25mW power at 250ksps extends battery life while ±2LSB INL ensures accurate tissue boundary detection. | Use Scenario: High-precision monitoring of pressure, temperature, and flow sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Isolated analog front-end ADC interfacing with sigma-delta sensor conditioners via differential inputs. Use Value: ±2.5V differential input range rejects common-mode noise in electrically noisy industrial environments. |
| Portable Test Equipment | Battery-Powered Data Loggers |
Use Scenario: Handheld oscilloscopes and spectrum analyzers requiring fast sampling without AC mains dependency. IC Role / Device Role / Timing Role: Core acquisition engine synchronizing CNV triggers with internal oscillator for jitter-free sampling. Use Value: Internal conversion clock eliminates external crystal and associated layout complexity and cost. | Use Scenario: Environmental sensor nodes logging temperature, humidity, and gas concentration over months on coin-cell batteries. IC Role / Device Role / Timing Role: Low-duty-cycle ADC activated only during scheduled measurement bursts. Use Value: 0.5µA power-down current and 13µW average consumption at 1ksps maximize operational lifetime. |
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 |
|---|---|---|---|
| AD7682BCPZ-RL7 | 16-bit, 250ksps, but uses pseudo-differential input (single-ended IN+ with IN– tied to REF/2); no daisy-chain mode; 4.5mW power. | Requires external level-shifting for true differential signals; less suitable for high-common-mode-noise environments. | Select when cost sensitivity outweighs need for full differential input and daisy-chain capability. |
| ADS8860IRGET | 16-bit, 1MSPS, but consumes 11mW at full speed; SPI interface only supports 3.3V logic; no extended acquisition time specification. | Higher speed trades off power efficiency and driver flexibility; limited I/O voltage range increases level-shifter requirements. | Select when >250ksps throughput is mandatory and system can accommodate higher power and simpler driver design. |
Compared with AD7682BCPZ-RL7 and ADS8860IRGET, the LTC2381IDE-16#PBF uniquely combines true differential input, daisy-chain support, ultra-low 3.25mW power, and 3.25µs acquisition time-making it optimal for battery-constrained, noise-immune, multi-channel industrial and medical acquisition systems.
Availability
LTC2381IDE-16#PBF is available at Aetrix Electronics and suitable for medical imaging signal chains, industrial process monitoring systems, and portable test equipment requiring stable component supply across extended temperature ranges.
Supply support for LTC2381IDE-16#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 LTC2381IDE-16#PBF belongs to ADI's precision SAR ADC product line, engineered for applications demanding high resolution, low power, and robust noise immunity in space-constrained industrial and portable instrumentation.
FAQ
What is the operating temperature range for the LTC2381IDE-16#PBF?
The LTC2381IDE-16#PBF is specified for operation from –40°C to +85°C, meeting industrial-grade environmental requirements. This rating is validated across all key specifications including INL, SNR, and power consumption, with no derating needed within this range. The DFN package's exposed pad enhances thermal dissipation to maintain stability at elevated ambient temperatures.
Does the LTC2381IDE-16#PBF require an external clock source?
No, the LTC2381IDE-16#PBF features an internal oscillator that sets the conversion time, eliminating the need for an external clock source. This simplifies system design by removing timing synchronization concerns and reducing component count. The internal clock ensures consistent 250ksps throughput without jitter introduced by external sources, directly supporting the device's 92dB SNR specification.
How does the daisy-chain mode work on the LTC2381IDE-16#PBF?
Daisy-chain mode on the LTC2381IDE-16#PBF is enabled by driving the CHAIN pin high, which reconfigures RDL/SDI as a serial data input. Multiple LTC2381IDE-16#PBF devices can then share a single SCK and SDO line, with conversion results cascaded sequentially. This reduces GPIO usage on the host controller and ensures synchronized sampling across channels without additional timing circuitry.
What reference voltage is recommended for the LTC2381IDE-16#PBF?
The LTC2381IDE-16#PBF requires a stable 2.5V external reference; the LTC6652-2.5 is explicitly recommended in the datasheet for its 0.05% initial accuracy and 5ppm/°C drift. This reference maintains <0.5LSB deviation across the full code span at 250ksps, preserving the ADC's 92dB SNR and ±2LSB INL performance. A 47µF X5R ceramic capacitor must be placed directly at the REF pin.
Can the LTC2381IDE-16#PBF interface directly with a 1.8V microcontroller?
Yes, the LTC2381IDE-16#PBF supports 1.8V logic levels via its OVDD pin, which sets the I/O voltage threshold. When OVDD = 1.8V, VIH is 1.44V min and VIL is 0.36V max, ensuring reliable communication with 1.8V MCUs without level shifters. The SPI-compatible interface maintains timing integrity down to 10ns SCK period, enabling high-speed transfers even at reduced logic voltages.
LTC2381IDE-16#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 1
- Input Type:
- 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
- Voltage - Supply, Analog:
- 2.375V ~ 2.625V
- Voltage - Supply, Digital:
- 2.375V ~ 2.625V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-DFN (4x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2381IDE-16#PBF FAQ
1.How can I place an order for LTC2381IDE-16#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2381IDE-16#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 LTC2381IDE-16#PBF reliable?
The price and inventory of LTC2381IDE-16#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2381IDE-16#PBF is usually 5 days.
3.What payment methods are accepted for LTC2381IDE-16#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2381IDE-16#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2381IDE-16#PBF?
LTC2381IDE-16#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2381IDE-16#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 LTC2381IDE-16#PBF?
For technical support, including LTC2381IDE-16#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2381IDE-16#PBF requirements.
6.How does Aetrix verify that LTC2381IDE-16#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2381IDE-16#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 LTC2381IDE-16#PBF meets industry standards.
7.What is the process for return or replacement of LTC2381IDE-16#PBF?
All LTC2381IDE-16#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2381IDE-16#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 LTC2381IDE-16#PBF part is unused and in its original packaging.
Return procedure for LTC2381IDE-16#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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