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Analog Devices Inc. LTC2381IDE-16#TRPBF
- Part No.:
- LTC2381IDE-16#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC2381IDE-16#TRPBF.pdf
- Description:
- IC ADC 16BIT SAR 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,979
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Product details
Overview
LTC2381IDE-16#TRPBF from Analog Devices (formerly 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 VDD supply and supports 1.8V–5V I/O logic levels via separate OVDD, enabling direct interfacing with diverse host processors in portable instrumentation and industrial data acquisition systems.
For engineers reviewing the LTC2381IDE-16#TRPBF datasheet, LTC2381IDE-16#TRPBF pinout, LTC2381IDE-16#TRPBF application, or LTC2381IDE-16#TRPBF equivalent, key selection considerations include guaranteed 16-bit no-missing-codes operation over –40°C to +85°C, extended 3.25µs acquisition time for low-power driver compatibility, SPI-compatible serial interface with daisy-chain mode, and internal conversion clock eliminating external timing constraints.
Technical Context
The LTC2381IDE-16#TRPBF implements a proprietary sampling architecture that allows acquisition of the next sample during the current conversion cycle, achieving zero cycle latency and enabling continuous high-speed sampling without pipeline delay. Its differential SAR core uses a 16-bit CDAC and precision comparator referenced to an external 2.5V source, delivering bipolar two's complement output codes with 76µV LSB resolution.
Conversion is initiated by a rising edge on CNV; BUSY goes high during conversion and returns low upon completion. The device features automatic power-down between conversions, scaling quiescent current from 1.7mA at 250ksps to 0.5µA in shutdown, and supports both normal mode (RDL/SDI as bus enable) and chain mode (RDL/SDI as serial data input) via the CHAIN pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees full 65,536-level quantization with no missing codes across temperature. |
| Sampling Rate | 250ksps - enables real-time capture of signals up to 125kHz Nyquist bandwidth. |
| SNR | 92dB (typ) at fIN = 20kHz - ensures >15 effective bits of dynamic range for precision measurement. |
| INL | ±2LSB (max) - limits integral nonlinearity error to ≤±0.003% of full-scale range. |
| Power Consumption | 3.25mW at 250ksps - permits battery operation in portable instrumentation with minimal thermal load. |
| Input Range | ±2.5V fully differential - supports wide dynamic signal swing while rejecting common-mode noise. |
| Acquisition Time | 3.25µs - allows use of ultra-low-power op-amps (e.g., LT6350) without settling-time penalties. |
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 control input | Selects Normal Mode (RDL/SDI = bus enable) or Chain Mode (RDL/SDI = SDI) for daisy-chained configurations. |
| VDD (2) | Digital supply | 2.5V ±62.5mV supply for core logic; requires 10µF ceramic bypass to GND. |
| GND (3,6,10,16) | Ground reference | Four dedicated ground pins minimize ground bounce and improve PSRR. |
| IN+, IN– (4,5) | Differential analog inputs | Accept ±2.5V differential signal; input capacitance = 45pF in sample mode, 5pF in hold mode. |
| REF (7,8) | Reference voltage input | Accepts 2.4V–2.6V external reference; draws up to 285µA at 250ksps; requires 47µF X5R ceramic decoupling. |
| CNV (9) | Convert trigger | Rising-edge initiates conversion; high state enables auto power-down after conversion completion. |
| BUSY (11) | Status indicator | Active-high open-drain output signals conversion progress; used for timing synchronization. |
| RDL/SDI (12) | Serial interface control/data | In Normal Mode: enables/disables SDO; in Chain Mode: accepts serial data from upstream ADC. |
| SCK (13) | Serial clock input | Accepts up to 100MHz clock (10ns period); controls data shift timing for SDO output. |
| SDO (14) | Serial data output | 2's complement 16-bit result shifted MSB-first on SCK rising edges; tri-state when RDL/SDI = low. |
| OVDD (15) | I/O supply | 1.71V–5.25V logic supply; sets VIH/VIL thresholds and drives SDO/SCK/RDL/SDI buffers. |
| GND (17) | Exposed pad ground | Thermal and electrical ground connection; mandatory soldering required for spec compliance. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay or cycle latency | Enables deterministic real-time sampling for closed-loop control and burst-mode acquisition without output gaps. |
| Extended 3.25µs acquisition window | Reduces required drive strength by >5× versus standard SAR ADCs, allowing use of sub-1mA op-amps like LT6350. |
| Internal conversion oscillator | Eliminates need for external clock source or precise timing circuitry, simplifying system BOM and layout. |
| Auto power-down between conversions | Reduces average power proportionally to sampling rate-13µW at 1ksps-extending battery life in intermittent-sampling applications. |
| SPI-compatible serial interface with daisy-chain mode | Supports multi-ADC synchronization using single SCK/SDO lines, reducing FPGA/GPIO resource usage in channel-dense systems. |
Applications
| Medical Imaging Signal Chain | Industrial Process Monitoring |
|---|---|
Use Scenario: Digitizing low-noise analog outputs from ultrasound transducer front-ends or MRI gradient amplifiers requiring high dynamic range and low distortion. IC Role / Device Role / Timing Role: Primary high-speed, high-accuracy ADC capturing baseband signals with 92dB SNR and ±2LSB INL to preserve diagnostic fidelity. Use Value: Enables 16-bit resolution without missing codes across –40°C to +85°C ambient, ensuring consistent image quality in portable or field-deployable equipment. | Use Scenario: High-channel-count data logging in PLCs or distributed I/O modules measuring temperature, pressure, and flow sensor outputs. IC Role / Device Role / Timing Role: Precision SAR ADC with daisy-chain capability for synchronized multi-channel sampling across modular backplanes. Use Value: Reduces inter-channel skew and eliminates external clock distribution complexity while maintaining <±2LSB linearity over industrial temperature range. |
| Portable Test Equipment | Battery-Powered ATE |
Use Scenario: Handheld oscilloscopes, spectrum analyzers, or multimeters where size, power, and AC performance are critical. IC Role / Device Role / Timing Role: Low-power 250ksps ADC with internal oscillator and auto power-down, minimizing active time per sample. Use Value: Achieves 3.25mW at full speed and drops to 13µW at 1ksps, extending runtime on single-cell Li-ion batteries without compromising SNR. | Use Scenario: Automated test systems performing rapid parametric measurements on semiconductor devices or PCBAs. IC Role / Device Role / Timing Role: Zero-latency SAR ADC providing immediate digital results after CNV assertion for tight timing loops. Use Value: Eliminates pipeline delay-induced timing uncertainty, enabling sub-microsecond trigger-to-data turnaround in high-throughput production testing. |
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 |
|---|---|---|---|
| ADS8860IDRCT | 16-bit, 1MSPS, 2.5V supply, ±2.5V input, but requires external reference and has higher 12.5mW power at full speed. | Higher speed suits broadband RF sampling; less suitable for ultra-low-power portable designs. | Select when >250ksps throughput is required and system can accommodate higher power and external reference routing. |
| AD7960BCPZ-RL7 | 18-bit, 5MSPS, ±2.5V input, uses LVDS interface, requires external 5V reference and consumes 39mW at full speed. | Targeted at high-end instrumentation needing >16-bit resolution; incompatible pinout and interface voltage levels. | Choose for applications demanding 18-bit accuracy and >1MSPS sampling, accepting larger footprint and higher power budget. |
Compared with ADS8860IDRCT and AD7960BCPZ-RL7, the LTC2381IDE-16#TRPBF delivers optimal balance of 16-bit precision, 250ksps speed, ultra-low 3.25mW power, and integrated reference interface-making it uniquely suited for space-constrained, battery-operated, and thermally sensitive industrial and medical instrumentation.
Availability
LTC2381IDE-16#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial process monitoring, and battery-powered ATE requiring stable component supply with guaranteed –40°C to +85°C operation and long-term manufacturing continuity.
Supply support for LTC2381IDE-16#TRPBF 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 LTC2381IDE-16#TRPBF belongs to ADI's legacy Linear Technology precision data acquisition portfolio, engineered specifically for low-power, high-SNR, zero-latency SAR conversion in portable and harsh-environment instrumentation.
FAQ
What is the operating temperature range for the LTC2381IDE-16#TRPBF?
The LTC2381IDE-16#TRPBF is specified for operation from –40°C to +85°C. This industrial-grade temperature range is validated across all key specifications including INL (±2LSB max), SNR (92dB typ), and power consumption (3.25mW at 250ksps), making it suitable for deployment in factory-floor controllers, outdoor sensors, and portable medical devices without derating.
Does the LTC2381IDE-16#TRPBF require an external clock source?
No, the LTC2381IDE-16#TRPBF integrates an internal oscillator that sets conversion timing, eliminating the need for an external clock. Conversion is triggered solely by the CNV pin rising edge, and BUSY indicates completion. This simplifies system design by removing clock generation, distribution, and jitter concerns-critical for portable and EMI-sensitive applications.
How does the daisy-chain mode work on the LTC2381IDE-16#TRPBF?
Daisy-chain mode is enabled by driving the CHAIN pin high. In this mode, RDL/SDI becomes a serial data input, allowing multiple LTC2381IDE-16#TRPBF devices to share one SCK and SDO line. Each device shifts its 16-bit result into the next, enabling synchronized multi-channel sampling with minimal GPIO usage and deterministic inter-channel timing alignment.
What reference voltage is recommended for the LTC2381IDE-16#TRPBF?
The LTC2381IDE-16#TRPBF requires a stable 2.5V external reference. The LTC6652-2.5 is explicitly recommended: it provides 0.05% initial accuracy, 5ppm/°C drift, and is specified over the same –40°C to +125°C range as the H-grade variant. Its low noise and fast settling ensure the LTC2381IDE-16#TRPBF achieves full 92dB SNR and ±2LSB INL performance.
Can the LTC2381IDE-16#TRPBF operate with different I/O voltage levels?
Yes-the LTC2381IDE-16#TRPBF supports independent OVDD supply from 1.71V to 5.25V, allowing direct interface with 1.8V, 2.5V, 3.3V, or 5V logic families. VDD remains fixed at 2.5V for core operation. This dual-supply flexibility eliminates level-shifters in mixed-voltage systems, preserving signal integrity and reducing board area in FPGA- or microcontroller-based data loggers.
LTC2381IDE-16#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC2381IDE-16#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2381IDE-16#TRPBF 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#TRPBF reliable?
The price and inventory of LTC2381IDE-16#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2381IDE-16#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2381IDE-16#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2381IDE-16#TRPBF?
LTC2381IDE-16#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2381IDE-16#TRPBF 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#TRPBF?
For technical support, including LTC2381IDE-16#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2381IDE-16#TRPBF requirements.
6.How does Aetrix verify that LTC2381IDE-16#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2381IDE-16#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2381IDE-16#TRPBF?
All LTC2381IDE-16#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2381IDE-16#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC2381IDE-16#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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