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Analog Devices Inc. LTC2381HMS-16#PBF
- Part No.:
- LTC2381HMS-16#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2381HMS-16#PBF.pdf
- Description:
- IC ADC 16BIT SAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,304
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Product details
Overview
LTC2381HMS-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 supply (VDD), supports 1.8V–5V I/O logic (OVDD), and is qualified for –40°C to +125°C operation - ideal for high-precision, high-speed data acquisition in harsh industrial or aerospace environments.
For engineers reviewing the LTC2381HMS-16#PBF datasheet, LTC2381HMS-16#PBF pinout, LTC2381HMS-16#PBF application, or LTC2381HMS-16#PBF equivalent, key selection criteria include guaranteed no-missing-codes at 16 bits, daisy-chain SPI interface compatibility, extended 3.25µs acquisition time enabling ultra-low-power driver use, internal conversion clock, and H-grade temperature qualification up to 125°C.
Technical Context
The LTC2381HMS-16#PBF implements a proprietary SAR architecture with simultaneous acquisition and conversion: while digitizing the current sample, it begins acquiring the next sample, yielding an extended 3.25µs acquisition window. This eliminates pipeline latency and enables use of low-bandwidth, low-power ADC drivers without performance penalty.
Its SPI-compatible serial interface supports 1.8V/2.5V/3.3V/5V OVDD levels and includes daisy-chain mode via the CHAIN pin. Conversion timing is internally generated (no external clock required), and automatic power-down between conversions scales quiescent current from 110µA (H-grade, idle) to 1.7mA (250ksps), reducing thermal load in compact systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 discrete output levels with guaranteed no missing codes across full temperature range. |
| Sampling Rate | 250ksps - enables real-time capture of signals up to 125kHz Nyquist bandwidth with zero cycle latency. |
| INL (Max) | ±2 LSB - ensures monotonicity and ≤0.003% full-scale linearity error for precision measurement applications. |
| SNR (Typ) | 92 dB at fIN = 20kHz - corresponds to ~15.3 effective number of bits (ENOB), supporting high-fidelity signal reconstruction. |
| Supply Voltage (VDD) | 2.5 V ±62.5 mV - requires tight regulation; bypassing with 10µF ceramic capacitor essential for noise-sensitive SAR operation. |
| Reference Input | External 2.4V–2.6V - mandates low-noise, low-drift reference (e.g., LTC6652-2.5); draws up to 285µA DC load at 250ksps. |
| Operating Temp | –40°C to +125°C - qualified per H-grade specification; validated for extended reliability in automotive engine control or downhole instrumentation. |
Pinout & Package
Package: 16-lead plastic MSOP (4mm × 5mm), exposed pad not present (unlike DFN variant). Pin 17 does not exist in MSOP; GND connections are on pins 3, 6, 10, and 16.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CHAIN (1) | Mode selector | High = daisy-chain SPI mode (RDL/SDI becomes SDI); low = normal mode (RDL/SDI enables/disables SDO). |
| VDD (2) | Digital core supply | 2.5V ±62.5mV supply for ADC logic and CDAC; must be decoupled with 10µF ceramic capacitor to GND. |
| GND (3,6,10,16) | Ground reference | Four dedicated ground pins minimize ground bounce and improve PSRR; all must connect to low-impedance PCB ground plane. |
| IN+, IN– (4,5) | Differential analog inputs | Accept ±2.5V fully differential input; input capacitance = 45pF (sample), 5pF (hold); require matched trace routing. |
| REF (7,8) | Reference voltage input | 2.4V–2.6V external reference; dual-pin connection reduces impedance and improves noise rejection. |
| CNV (9) | Convert trigger | Rising edge initiates conversion; held high after conversion to enable auto power-down until next CNV rising edge. |
| BUSY (11) | Conversion status indicator | Active-high open-drain output; asserts during conversion, deasserts when result is ready on SDO. |
| RDL/SDI (12) | Serial bus control / data input | In normal mode: controls SDO tri-state; in chain mode: serial data input for daisy-chained configuration. |
| SCK (13) | Serial clock input | Accepts up to 100MHz clock (10ns period); rising edge clocks out MSB-first 2's complement data on SDO. |
| SDO (14) | Serial data output | Tri-state output; drives conversion result or daisy-chain data; compatible with 1.8V–5V logic levels via OVDD. |
| OVDD (15) | I/O interface supply | 1.71V–5.25V supply setting logic level for SDO, SCK, RDL/SDI, BUSY; bypass with 0.1µF ceramic capacitor. |
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 time | Allows use of low-power, low-bandwidth op-amps (e.g., LT6350) as input drivers - reducing system power by >50% vs standard SARs. |
| Internal conversion oscillator | Eliminates need for external timing components; simplifies layout and improves jitter immunity in noisy environments. |
| H-grade temperature qualification | Guaranteed parametric performance from –40°C to +125°C - suitable for under-hood automotive, turbine monitoring, or oil/gas downhole tools. |
| Daisy-chain SPI mode | Supports multi-ADC synchronization with single SCK/SCK and minimal interconnect - reduces FPGA GPIO count and PCB routing complexity. |
Applications
| Industrial Process Control | High-Speed Data Acquisition |
|---|---|
|
Use Scenario: Monitoring pressure, temperature, and flow sensors in chemical plant PLC I/O modules operating continuously at ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Precision digitization of 4–20mA loop signals conditioned to ±2.5V differential range; synchronized sampling across multiple channels via CNV edge triggering. Use Value: ±2LSB INL and 92dB SNR ensure <0.01% measurement accuracy over full industrial temperature range, meeting IEC 61000-4-2/4-4 immunity requirements. |
Use Scenario: Real-time waveform capture in portable oscilloscopes or automated test equipment requiring 250ksps sustained throughput. IC Role / Device Role / Timing Role: High-speed SAR ADC with zero-latency output delivering 16-bit samples directly to FPGA memory buffers via SPI daisy-chain. Use Value: 3.25mW power at full rate enables battery-powered operation for >8 hours; extended acquisition time allows use of rail-to-rail op-amps with <10mA quiescent current. |
| Medical Imaging Subsystem | Aerospace Sensor Interface |
|
Use Scenario: Digitizing analog outputs from ultrasound transducer beamforming ASICs in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-noise ADC capturing echo return signals with precise timing alignment across multiple parallel channels using shared CNV and BUSY signals. Use Value: 92dB SNR preserves dynamic range for weak echo detection; 16-bit resolution resolves sub-millimeter tissue boundaries in B-mode imaging. |
Use Scenario: Interfacing strain gauges and accelerometers in flight control surface monitoring units exposed to –55°C to +125°C thermal cycling. IC Role / Device Role / Timing Role: Ruggedized ADC performing periodic health checks on critical airframe sensors; powered only during scheduled sampling bursts. Use Value: H-grade qualification and 110µA shutdown current ensure long-term reliability and low standby power in unheated avionics bays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, high-precision SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7626BCPZ-RL7 | 16-bit, 10MSPS, 2.5V supply, but requires external reference and has higher 22mW power at full speed; no daisy-chain mode. | Targeted at higher-speed applications (>1MSPS); less suitable for ultra-low-power or thermally constrained designs. | Select AD7626BCPZ-RL7 only when sampling rate >1MSPS is mandatory and board space allows larger decoupling network. |
| LTC2378-16IMS#PBF | 16-bit, 1Msps, same 2.5V supply and ±2.5V input, but rated only to 85°C (I-grade); 95.5dB SNR (higher), 4.5mW power. | Optimized for lab-grade instrumentation where extended temperature range is unnecessary but SNR is critical. | Choose LTC2378-16IMS#PBF for benchtop analyzers needing best-in-class noise performance, not for field-deployed H-grade systems. |
Compared with AD7626BCPZ-RL7 and LTC2378-16IMS#PBF, the LTC2381HMS-16#PBF uniquely balances 250ksps throughput, 125°C operation, 3.25mW power, and daisy-chain capability - making it optimal for distributed sensor networks in harsh environments where thermal resilience and inter-ADC synchronization are non-negotiable.
Availability
LTC2381HMS-16#PBF is available at Aetrix Electronics and suitable for industrial process control, aerospace sensor interfaces, portable medical diagnostics, and high-reliability data acquisition systems requiring stable component supply across extended temperature ranges.
Supply support for LTC2381HMS-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, serving industrial, automotive, communications, and healthcare markets.
The LTC2381-16 family was designed specifically for high-accuracy, low-power, high-speed data acquisition in thermally demanding applications - emphasizing robustness, ease of timing integration, and seamless interoperability with low-power signal conditioning circuits.
FAQ
What is the maximum operating temperature for the LTC2381HMS-16#PBF?
The LTC2381HMS-16#PBF is rated for continuous operation from –40°C to +125°C (H-grade). This is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables, where parameters marked with "l" apply over the full temperature range. The MSOP package's θJA = 110°C/W supports this rating with appropriate PCB copper area.
Does the LTC2381HMS-16#PBF require an external clock source?
No, the LTC2381HMS-16#PBF features an internal oscillator that sets conversion timing - eliminating the need for an external clock. The CNV input triggers conversion on each rising edge, and the internal timing generator handles the 2–3µs conversion period and 4µs total cycle time, easing system-level timing design.
Can the LTC2381HMS-16#PBF operate with a 3.3V I/O interface?
Yes, the LTC2381HMS-16#PBF supports 1.8V, 2.5V, 3.3V, and 5V logic levels via its OVDD pin (Pin 15), which powers the SDO, SCK, RDL/SDI, and BUSY I/O buffers. When OVDD = 3.3V, VIH = 2.64V min and VOL = 0.2V max - fully compatible with standard 3.3V CMOS interfaces.
What reference voltage IC is recommended for use with the LTC2381HMS-16#PBF?
The LTC6652-2.5 is explicitly recommended in the datasheet for the LTC2381HMS-16#PBF. It provides 2.5V output with 0.05% initial accuracy, 5ppm/°C drift, and full H-grade (–40°C to +125°C) qualification - matching the ADC's temperature range and preserving 16-bit accuracy across environmental stress.
How does the daisy-chain mode work on the LTC2381HMS-16#PBF?
Daisy-chain mode is enabled by driving CHAIN (Pin 1) high. In this mode, RDL/SDI becomes a serial data input, allowing multiple LTC2381HMS-16#PBF 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 FPGA resource usage.
LTC2381HMS-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:
- -40°C ~ 125°C
- Supplier Device Package:
- 16-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2381HMS-16#PBF FAQ
1.How can I place an order for LTC2381HMS-16#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2381HMS-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 LTC2381HMS-16#PBF reliable?
The price and inventory of LTC2381HMS-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 LTC2381HMS-16#PBF is usually 5 days.
3.What payment methods are accepted for LTC2381HMS-16#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2381HMS-16#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2381HMS-16#PBF?
LTC2381HMS-16#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2381HMS-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 LTC2381HMS-16#PBF?
For technical support, including LTC2381HMS-16#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2381HMS-16#PBF requirements.
6.How does Aetrix verify that LTC2381HMS-16#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2381HMS-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 LTC2381HMS-16#PBF meets industry standards.
7.What is the process for return or replacement of LTC2381HMS-16#PBF?
All LTC2381HMS-16#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2381HMS-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 LTC2381HMS-16#PBF part is unused and in its original packaging.
Return procedure for LTC2381HMS-16#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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