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Analog Devices Inc. LTC2381CDE-16#PBF
- Part No.:
- LTC2381CDE-16#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC2381CDE-16#PBF.pdf
- Description:
- IC ADC 16BIT SAR 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,256
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Product details
Overview
LTC2381CDE-16#PBF 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 (typ), ±2LSB INL (max), and 3.25mW power consumption at full speed. It operates from a single 2.5V VDD supply, supports 1.8V–5V I/O logic via separate OVDD, and targets high-speed data acquisition in portable instrumentation and industrial control.
For engineers reviewing the LTC2381CDE-16#PBF datasheet, LTC2381CDE-16#PBF pinout, LTC2381CDE-16#PBF application, or LTC2381CDE-16#PBF equivalent, key selection criteria include guaranteed 16-bit no-missing-codes operation, extended 3.25µs acquisition time enabling low-power ADC drivers, daisy-chain SPI interface compatibility, internal conversion clock, and operation across 0°C to 70°C with DFN (4mm × 3mm) packaging.
Technical Context
The LTC2381CDE-16#PBF implements a proprietary sampling architecture that allows acquisition of the next sample during the current conversion cycle, eliminating pipeline delay and achieving zero cycle latency. Its internal oscillator governs conversion timing, removing external clock dependencies.
It uses a 16-bit CDAC-based SAR core with differential comparator, accepts external 2.5V reference (2.4V–2.6V), and delivers 2's complement serial output over SPI-compatible interface with RDL/SDI dual-mode (bus enable or daisy-chain input) controlled by CHAIN pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees full 65,536-level quantization with no missing codes. |
| Sampling Rate | 250ksps - enables real-time capture of signals up to 125kHz Nyquist bandwidth. |
| SNR | 92dB (typ at fIN = 20kHz) - supports >15 effective bits of dynamic resolution for precision measurement. |
| INL | ±2LSB (max) - ensures monotonicity and accurate end-point linearity across temperature. |
| Power Dissipation | 3.25mW at 250ksps - enables battery-operated designs with minimal thermal impact. |
| Acquisition Time | 3.25µs - permits use of low-bandwidth, low-power op-amp drivers (e.g., LT6350) without settling error. |
| Reference Input | External 2.5V (2.4V–2.6V) - decoupled via 47µF X5R ceramic capacitor for stable full-scale definition. |
Pinout & Package
Package: 16-lead (4mm × 3mm) plastic DFN with exposed pad (Pin 17), RoHS-compliant, rated for 0°C to 70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CHAIN (1) | Mode selector | High = daisy-chain mode (RDL/SDI becomes SDI); Low = normal mode (RDL/SDI enables SDO). |
| VDD (2) | Digital supply | 2.375V–2.625V @ 2.5V nominal; powers core logic and must be bypassed with 10µF ceramic. |
| GND (3,6,10,16) | Ground reference | Four dedicated ground pins minimize noise coupling; exposed pad (Pin 17) is GND and must be soldered. |
| IN+, IN– (4,5) | Differential analog inputs | Accept ±2.5V fully differential signal; input capacitance = 45pF (sample), 5pF (hold); CMRR = 70dB. |
| REF (7,8) | Reference voltage input | 2.4V–2.6V external reference; draws up to 285µA at 250ksps; requires 47µF X5R decoupling. |
| CNV (9) | Convert trigger | Rising edge initiates conversion; high state enables auto power-down between conversions. |
| BUSY (11) | Conversion status | Active-high open-drain indicator; goes high at conversion start, low at completion. |
| RDL/SDI (12) | Serial bus control / data input | In Normal Mode: enables/disables SDO; in Chain Mode: receives daisy-chained data from upstream ADC. |
| SCK (13) | Serial clock input | Accepts 10ns min period (100MHz max); controls MSB-first data shift on rising edge. |
| SDO (14) | Serial data output | 2's complement 16-bit result; tri-state when RDL/SDI = low in Normal Mode. |
| OVDD (15) | I/O supply | 1.71V–5.25V logic interface supply; sets VIH/VIL thresholds and drives SDO/RDL/SDI/BUSY. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay / zero cycle latency | Enables deterministic real-time control loops without output code buffering or timing uncertainty. |
| Extended 3.25µs acquisition window | Reduces required driver bandwidth and quiescent current-enables use of ultra-low-power amplifiers like LT6350. |
| SPI-compatible daisy-chain mode | Allows synchronous multi-ADC systems with single SCK/SCK and shared CNV, minimizing PCB routing and host GPIO usage. |
| Auto power-down between conversions | Reduces average power to 13µW at 1ksps; scales linearly with sampling rate for energy-constrained applications. |
| Guaranteed operation to 125°C (H-grade variants) | Validates thermal robustness for industrial and automotive under-hood environments-C-grade (LTC2381CDE-16#PBF) covers 0°C–70°C. |
Applications
| Medical Imaging Signal Chain | Portable Data Logger |
|---|---|
Use Scenario: Digitizing low-noise sensor outputs (e.g., photodiode arrays, piezoelectric transducers) in ultrasound or digital X-ray front-ends. IC Role / Device Role / Timing Role: High-fidelity 16-bit SAR ADC capturing transient analog waveforms with 92dB SNR and minimal harmonic distortion. Use Value: Preserves diagnostic image fidelity by maintaining >15 ENOB across 20kHz bandwidth without oversampling or digital filtering. |
Use Scenario: Battery-powered environmental monitoring node acquiring temperature, pressure, and gas sensor outputs over extended periods. IC Role / Device Role / Timing Role: Low-power, high-accuracy ADC enabling burst-mode sampling with <13µW idle current and fast wake-up. Use Value: Extends battery life while delivering calibrated 16-bit readings-no missing codes ensures reliable threshold detection and alarm triggering. |
| Industrial Process Controller | Automated Test Equipment (ATE) |
Use Scenario: Closed-loop feedback acquisition in PLC analog I/O modules measuring 4–20mA current loops or ±10V sensor outputs. IC Role / Device Role / Timing Role: Precision SAR ADC with ±2.5V differential input and external reference support for ratiometric accuracy. Use Value: Eliminates gain/offset drift errors via bipolar zero-scale and full-scale error specs (±0.25LSB and ±3LSB max), ensuring long-term calibration stability. |
Use Scenario: High-throughput functional testing of mixed-signal ICs requiring synchronized multi-channel digitization at 250ksps. IC Role / Device Role / Timing Role: Zero-latency ADC enabling real-time pass/fail decisions with deterministic timing via CNV-triggered conversion. Use Value: Achieves 250ksps throughput without FIFO buffering or DMA overhead-reduces test time and system complexity. |
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 |
|---|---|---|---|
| AD7960BCPZ-RL7 | 18-bit, 5MSPS, 1.8V/5V dual-supply, no internal oscillator, requires external clock. | Higher resolution/speed but higher power (34mW), larger 48-lead LFCSP package, no daisy-chain mode. | Select when >16-bit resolution and >250ksps throughput are mandatory; avoid if board space, power, or SPI simplicity are constraints. |
| ADS8860IDRCT | 16-bit, 1MSPS, single 2.5V supply, SPI interface, no daisy-chain, 3.3V I/O only. | Higher speed but lacks extended acquisition time (1.2µs), no 1.8V/5V I/O flexibility, smaller 10-pin WSON package. | Prefer for compact, high-speed single-channel designs where 3.3V-only interface suffices and driver settling is less critical. |
Compared with AD7960BCPZ-RL7 and ADS8860IDRCT, the LTC2381CDE-16#PBF uniquely balances 250ksps throughput, 92dB SNR, ultra-low 3.25mW power, and flexible daisy-chain capability in a compact DFN-making it optimal for space- and power-constrained multi-channel systems requiring deterministic timing and wide input voltage support.
Availability
LTC2381CDE-16#PBF is available at Aetrix Electronics and suitable for medical imaging signal chains, portable data loggers, and industrial process controllers requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for LTC2381CDE-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 acquired Linear Technology in 2017 and maintains its high-performance precision analog portfolio, emphasizing signal chain integrity, low-noise design, and industrial-grade reliability.
The LTC2381-16 family was designed for high-speed, low-power, high-accuracy data acquisition in portable, medical, and industrial systems-prioritizing zero-latency operation, extended acquisition time, and flexible I/O voltage support.
FAQ
What is the operating temperature range for the LTC2381CDE-16#PBF?
The LTC2381CDE-16#PBF is specified for 0°C to 70°C ambient operation. This C-grade variant uses the 4mm × 3mm DFN package with exposed pad and is intended for commercial and industrial environments where extended temperature grades (I or H) are not required. Full electrical specifications-including ±2LSB INL, 92dB SNR, and 250ksps throughput-are guaranteed across this range.
Does the LTC2381CDE-16#PBF require an external clock source?
No, the LTC2381CDE-16#PBF features an internal oscillator that sets conversion timing, eliminating the need for an external clock. This simplifies system design and reduces component count. The SCK pin is used solely for serial data transfer timing-not for conversion control-allowing asynchronous host communication independent of sampling rate.
How does the daisy-chain mode work on the LTC2381CDE-16#PBF?
Daisy-chain mode is enabled by driving the CHAIN pin high. In this mode, RDL/SDI functions as SDI (serial data input), accepting data from the SDO of a preceding ADC in the chain. SDO then outputs the concatenated result of all upstream devices, allowing multiple LTC2381CDE-16#PBF units to share one SCK and CNV line while maintaining synchronized sampling.
What reference voltage is recommended for the LTC2381CDE-16#PBF?
The LTC2381CDE-16#PBF requires a stable 2.5V external reference (2.4V–2.6V). The LTC6652-2.5 is explicitly recommended: it provides 0.05% initial accuracy, 5ppm/°C tempco, and is specified across the H-grade range. A 47µF X5R ceramic capacitor must be placed directly at the REF pin to handle charge injection during each conversion cycle.
Can the LTC2381CDE-16#PBF interface with 1.8V logic systems?
Yes-the LTC2381CDE-16#PBF supports 1.8V to 5V I/O logic levels via the OVDD supply pin. When OVDD = 1.8V, VIH = 1.44V (min) and VIL = 0.36V (max), ensuring reliable interfacing with 1.8V microcontrollers and FPGAs without level-shifting circuitry. All digital pins (SCK, SDO, RDL/SDI, BUSY, CNV, CHAIN) comply with this voltage range.
LTC2381CDE-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:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-DFN (4x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2381CDE-16#PBF FAQ
1.How can I place an order for LTC2381CDE-16#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2381CDE-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 LTC2381CDE-16#PBF reliable?
The price and inventory of LTC2381CDE-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 LTC2381CDE-16#PBF is usually 5 days.
3.What payment methods are accepted for LTC2381CDE-16#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2381CDE-16#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2381CDE-16#PBF?
LTC2381CDE-16#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2381CDE-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 LTC2381CDE-16#PBF?
For technical support, including LTC2381CDE-16#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2381CDE-16#PBF requirements.
6.How does Aetrix verify that LTC2381CDE-16#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2381CDE-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 LTC2381CDE-16#PBF meets industry standards.
7.What is the process for return or replacement of LTC2381CDE-16#PBF?
All LTC2381CDE-16#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2381CDE-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 LTC2381CDE-16#PBF part is unused and in its original packaging.
Return procedure for LTC2381CDE-16#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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