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Analog Devices Inc. LTC2381CMS-16#PBF
- Part No.:
- LTC2381CMS-16#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2381CMS-16#PBF.pdf
- Description:
- IC ADC 16BIT SAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,901
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Product details
Overview
LTC2381CMS-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 throughput. It operates from a single 2.5V supply (VDD), supports 1.8V–5V I/O logic (OVDD), and targets high-speed data acquisition in compact, low-power systems.
For engineers reviewing the LTC2381CMS-16#PBF datasheet, LTC2381CMS-16#PBF pinout, LTC2381CMS-16#PBF application, or LTC2381CMS-16#PBF equivalent, key selection criteria include guaranteed 16-bit no-missing-codes operation, extended 3.25µs acquisition time enabling ultra-low-power driver usage, SPI-compatible serial interface with daisy-chain mode, internal conversion clock, and operation up to 70°C in MSOP-16 package.
Technical Context
The LTC2381CMS-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 eliminates external clock dependency for timing-critical systems.
It features a fully differential SAR core with 45pF analog input capacitance in sample mode, 40Ω switch on-resistance, and CMRR ≥70dB. The 2's complement serial output is MSB-first, compatible with standard SPI protocols across 1.8V–5V logic levels, and supports both normal and daisy-chain modes 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 over temperature. |
| Sampling Rate | 250ksps - enables real-time capture of signals up to 125kHz Nyquist bandwidth without undersampling. |
| SNR | 92dB (typ at fIN = 20kHz) - supports >15 effective bits (ENOB ≈ 15.3) for precision measurement applications. |
| INL | ±2LSB (max) - ensures monotonicity and linearity critical for closed-loop control and calibration systems. |
| Power @ 250ksps | 3.25mW - enables battery-operated instrumentation with <1.7mA total supply current (VDD + OVDD + REF). |
| Acquisition Time | 3.25µs - permits use of low-bandwidth, low-power op-amps (e.g., LT6350) as ADC drivers without settling error. |
| Reference Input | External 2.4V–2.6V - requires stable, low-noise reference (e.g., LTC6652-2.5) for full 16-bit accuracy. |
Pinout & Package
Package: 16-lead plastic MSOP (4mm × 5mm), lead-free finish, operating temperature range 0°C to 70°C. Exposed pad not present in MSOP variant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CHAIN) | Chain Mode Selector | High = daisy-chain mode (RDL/SDI becomes serial data input); Low = normal mode (RDL/SDI enables SDO bus). |
| 2 (VDD) | Digital Core Supply | 2.375V–2.625V supply for ADC logic and internal oscillator; bypass with 10µF ceramic capacitor. |
| 3, 6, 10, 16 (GND) | Analog/Digital Ground | Four dedicated ground pins minimize ground bounce and improve noise immunity in mixed-signal layouts. |
| 4 (IN+), 5 (IN–) | Differential Analog Inputs | Accept ±2.5V fully differential signal; input impedance modeled as 45pF || 40Ω during acquisition. |
| 7, 8 (REF) | Reference Voltage Input | 2.4V–2.6V external reference; decoupled with 47µF X5R ceramic capacitor close to pins. |
| 9 (CNV) | Convert Trigger Input | Rising edge initiates conversion; high hold enables auto power-down between conversions. |
| 11 (BUSY) | Conversion Status Indicator | Active-high open-drain output signals conversion progress; used for timing synchronization. |
| 12 (RDL/SDI) | Bus Enable / Serial Data Input | Function depends on CHAIN state; enables SDO tri-state or accepts daisy-chain data. |
| 13 (SCK) | Serial Clock Input | Accepts up to 100MHz clock (10ns period); controls data shift timing for SDO output. |
| 14 (SDO) | Serial Data Output | 2's complement 16-bit result shifted MSB-first; compatible with SPI master devices. |
| 15 (OVDD) | I/O Interface Supply | 1.71V–5.25V logic supply; sets VIH/VIL thresholds and drives SDO/RDL/SDI/SCK/BUSY levels. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay, zero cycle latency | Enables deterministic real-time control loops without output code delay or buffer management overhead. |
| Extended 3.25µs acquisition window | Reduces required driver bandwidth and quiescent current-e.g., LT6350 operates at <1.5mA while maintaining 92dB SNR. |
| Auto power-down between conversions | Reduces average power to 13µW at 1ksps, ideal for burst-mode sensing and energy-constrained IoT nodes. |
| SPI-compatible interface with daisy-chain mode | Supports multi-ADC synchronization on single SCK/SDO lines-reduces PCB routing complexity and MCU GPIO count. |
| Guaranteed operation to 70°C (C-grade) | Validated performance across industrial ambient range without derating-no thermal design margin needed for enclosure-limited environments. |
Applications
| Medical Imaging Signal Chain | Portable Test & Measurement |
|---|---|
Use Scenario: Digitizing low-amplitude, high-frequency ultrasound echo signals in handheld imaging probes. IC Role / Device Role / Timing Role: Primary 16-bit SAR ADC capturing baseband RF signals at 250ksps with minimal added noise or distortion. Use Value: 92dB SNR and ±2LSB INL preserve dynamic range and linearity required for accurate tissue differentiation and Doppler analysis. |
Use Scenario: High-resolution voltage/current logging in handheld multimeters and portable oscilloscopes. IC Role / Device Role / Timing Role: Precision front-end ADC interfacing directly to sensor signal conditioning circuitry with minimal external components. Use Value: 3.25mW power and 3.25µs acquisition time allow use of micro-power op-amps and extend battery life beyond 24 hours per charge. |
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
Use Scenario: Continuous monitoring of analog sensor outputs (e.g., pressure, temperature, strain) in PLC I/O modules. IC Role / Device Role / Timing Role: High-accuracy, low-drift ADC providing calibrated digital feedback for closed-loop control systems. Use Value: Guaranteed no-missing-codes and ±2LSB INL ensure reliable detection of small process deviations without interpolation or firmware correction. |
Use Scenario: Multi-channel DC parametric testing of ICs requiring synchronized, high-fidelity analog stimulus/response capture. IC Role / Device Role / Timing Role: Channelized ADC in parallel acquisition architecture with daisy-chained SDO for compact, scalable channel expansion. Use Value: Daisy-chain mode reduces interconnect count by 50% versus individual SPI buses-enabling 16-channel ATE boards within tight layout constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8860IDRCT | 16-bit, 1MSPS, 2.5V supply, ±VREF input, SPI interface; consumes 4.5mW at 1MSPS but lacks daisy-chain mode. | Higher speed but higher power and no built-in daisy-chain support-requires external multiplexing or additional logic for multi-ADC sync. | Select when maximum throughput >250ksps is required and board space allows discrete synchronization logic. |
| AD7960BCPZ-RL7 | 18-bit, 5MSPS, 5V supply, pseudo-differential input, LVDS/CMOS interface; consumes 39mW at 5MSPS and requires external reference. | Higher resolution and speed, but significantly higher power, larger 48-lead LFCSP package, and no integrated oscillator or auto power-down. | Select when ENOB >16 bits is mandatory and system power budget accommodates ~12× higher dissipation. |
Compared with ADS8860IDRCT and AD7960BCPZ-RL7, the LTC2381CMS-16#PBF delivers optimal balance of precision (16-bit no missing codes), ultra-low power (3.25mW), and system integration (daisy-chain, internal clock, zero-latency) for space- and energy-constrained 250ksps applications-without requiring external timing or bus management circuitry.
Availability
LTC2381CMS-16#PBF is available at Aetrix Electronics and suitable for medical imaging signal chains, portable test equipment, and industrial process monitoring requiring stable component supply, long-term production continuity, and C-grade temperature assurance.
Supply support for LTC2381CMS-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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for precision measurement, industrial automation, and communications infrastructure.
The LTC2381-16 belongs to Linear's high-speed precision SAR ADC product line, designed specifically for applications demanding low power, high SNR, and deterministic timing-such as portable instrumentation, medical diagnostics, and real-time control systems.
FAQ
What is the maximum sampling rate of the LTC2381CMS-16#PBF?
The LTC2381CMS-16#PBF achieves a guaranteed maximum sampling rate of 250ksps across its full operating temperature range (0°C to 70°C). This rate is supported by its internal oscillator and zero-latency architecture, enabling consistent throughput without external clock tuning or pipeline management. At this rate, the LTC2381CMS-16#PBF consumes 3.25mW and maintains 92dB SNR and ±2LSB INL.
Does the LTC2381CMS-16#PBF require an external reference voltage?
Yes, the LTC2381CMS-16#PBF requires an external reference voltage applied to its dual REF pins (pins 7 and 8). The specified range is 2.4V to 2.6V, with optimal performance achieved using a low-noise, low-drift reference such as the LTC6652-2.5. The device draws up to 285µA from the reference at 250ksps, so proper decoupling with a 47µF X5R ceramic capacitor is mandatory to maintain 16-bit accuracy.
Can the LTC2381CMS-16#PBF operate with 1.8V logic levels?
Yes, the LTC2381CMS-16#PBF supports 1.8V logic levels via its OVDD pin (pin 15), which accepts 1.71V to 5.25V. When OVDD = 1.8V, the digital interface (SCK, SDO, RDL/SDI, BUSY, CHAIN) operates with VIH = 1.44V (0.8 × OVDD) and VIL = 0.36V (0.2 × OVDD), ensuring compatibility with modern low-voltage MCUs and FPGAs without level-shifting circuitry.
What is the purpose of the CHAIN pin on the LTC2381CMS-16#PBF?
The CHAIN pin (pin 1) configures the serial interface mode: when pulled high, it enables daisy-chain mode where RDL/SDI functions as serial data input, allowing multiple LTC2381CMS-16#PBF devices to share a single SCK and SDO line. When low, it selects normal mode where RDL/SDI acts as a bus enable for tri-stating SDO-supporting multi-drop SPI configurations without external multiplexers.
Is the LTC2381CMS-16#PBF pin-compatible with other members of the LTC2381 family?
Yes, the LTC2381CMS-16#PBF shares identical pinout and footprint with all MSOP-16 variants in the LTC2381-16 family-including LTC2381IMS-16#PBF (–40°C to 85°C) and LTC2381HMS-16#PBF (–40°C to 125°C). This allows direct replacement for temperature grade upgrades without PCB redesign, provided system-level thermal and timing margins accommodate the higher-grade specifications.
LTC2381CMS-16#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:
- 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-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2381CMS-16#PBF FAQ
1.How can I place an order for LTC2381CMS-16#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2381CMS-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 LTC2381CMS-16#PBF reliable?
The price and inventory of LTC2381CMS-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 LTC2381CMS-16#PBF is usually 5 days.
3.What payment methods are accepted for LTC2381CMS-16#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2381CMS-16#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2381CMS-16#PBF?
LTC2381CMS-16#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2381CMS-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 LTC2381CMS-16#PBF?
For technical support, including LTC2381CMS-16#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2381CMS-16#PBF requirements.
6.How does Aetrix verify that LTC2381CMS-16#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2381CMS-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 LTC2381CMS-16#PBF meets industry standards.
7.What is the process for return or replacement of LTC2381CMS-16#PBF?
All LTC2381CMS-16#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2381CMS-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 LTC2381CMS-16#PBF part is unused and in its original packaging.
Return procedure for LTC2381CMS-16#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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