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Analog Devices Inc. LTC2381IMS-16#PBF
- Part No.:
- LTC2381IMS-16#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2381IMS-16#PBF.pdf
- Description:
- IC ADC 16BIT SAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,320
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Product details
Overview
LTC2381IMS-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 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 LTC2381IMS-16#PBF datasheet, LTC2381IMS-16#PBF pinout, LTC2381IMS-16#PBF application, or LTC2381IMS-16#PBF equivalent, key selection criteria include guaranteed no-missing-codes operation at 16 bits, extended 3.25µs acquisition time for low-power driver compatibility, internal conversion clock eliminating external timing constraints, daisy-chain SPI interface support, and –40°C to +85°C industrial temperature rating in MSOP package.
Technical Context
The LTC2381IMS-16#PBF implements a proprietary sampling architecture that initiates acquisition of the next sample during the current conversion cycle, enabling its 3.25µs acquisition window without pipeline delay or cycle latency. Its fully differential SAR core uses a 2.5V reference to define a ±2.5V input range and delivers 2's complement serial output via SPI-compatible interface with configurable RDL/SDI bus enable or daisy-chain mode.
Conversion is triggered by a rising edge on CNV; BUSY asserts high during conversion and returns low upon completion. Internal oscillator sets tCONV = 2–3µs, while tCYC = 4µs enables deterministic 250ksps throughput. Power-down between conversions reduces IDD to 0.5µA, scaling dynamically with sampling rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees monotonic transfer function and full 65,536-code dynamic range without missing codes. |
| Sampling Rate | 250ksps - fixed maximum throughput with zero cycle latency, enabling real-time control loop sampling. |
| SNR | 92dB (typ) at fIN = 20kHz - defines usable signal bandwidth up to ~30MHz (–3dB input BW), critical for high-fidelity spectral analysis. |
| INL | ±2LSB (max) over temperature - ensures end-point linearity error ≤ ±0.003% of FSR, supporting precision measurement calibration. |
| Power Dissipation | 3.25mW at 250ksps - enables battery-powered operation with <1.7mA total supply current (VDD + OVDD + REF). |
| Acquisition Time | 3.25µs - allows use of ultra-low-power op-amps (e.g., LT6350) with minimal settling energy, reducing system-level power budget. |
| Reference Input | External 2.4V–2.6V - requires stable, low-noise source (e.g., LTC6652-2.5); draws 285µA max at 250ksps, demanding proper 47µF local decoupling. |
Pinout & Package
Package: 16-lead plastic MSOP (4mm × 5mm), rated for –40°C to +85°C operation. Exposed pad not present in MSOP variant; thermal resistance θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CHAIN (1) | Mode selector | High enables daisy-chain SPI mode (RDL/SDI becomes SDI); low enables normal mode (RDL/SDI controls SDO tri-state). |
| VDD (2) | Digital supply | 2.375V–2.625V core supply; bypass with 10µF ceramic capacitor to GND for noise immunity. |
| GND (3,6,10,16) | Ground reference | Four dedicated ground pins minimize ground bounce and improve PSRR in high-speed sampling. |
| IN+, IN– (4,5) | Differential analog inputs | Accept ±2.5V differential swing; input capacitance 45pF (sample) / 5pF (hold); require matched drive for CMRR >70dB. |
| REF (7,8) | Reference voltage input | 2.4V–2.6V external reference; dual-pin configuration reduces impedance and improves noise rejection. |
| CNV (9) | Convert trigger | Rising-edge initiated conversion; high state after conversion enables auto power-down until next edge. |
| BUSY (11) | Conversion status | Active-high open-drain indicator; synchronizes host read timing without polling overhead. |
| RDL/SDI (12) | Serial interface control/data | In Normal Mode: bus enable for SDO; in Chain Mode: serial data input from upstream ADC. |
| SCK (13) | Serial clock input | Accepts 10ns min period (100MHz max); timing-critical for SDO data capture on rising edge. |
| SDO (14) | Serial data output | 2's complement 16-bit result; MSB-first, tri-stated when RDL/SDI low in Normal Mode. |
| OVDD (15) | I/O supply | 1.71V–5.25V logic supply; sets VIH/VIL thresholds and drives SDO/SCK/RDL levels independently of VDD. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay or cycle latency | Enables deterministic real-time sampling with immediate data availability-critical for closed-loop control and burst-mode acquisition. |
| Extended 3.25µs acquisition time | Reduces required drive strength by >5× versus conventional SAR ADCs, permitting use of sub-1mA op-amps like LT6350 without performance penalty. |
| Internal conversion clock | Eliminates need for external timing circuitry or master clock synchronization, simplifying PCB layout and reducing BOM count. |
| Daisy-chain SPI interface | Supports multi-ADC configurations with single SCK/SDO bus, minimizing microcontroller GPIO usage and routing complexity in channel-dense systems. |
| Guaranteed operation to 125°C (H-grade variants) | Validates robustness in harsh environments; this I-grade part is specified from –40°C to +85°C with full parameter coverage across range. |
Applications
| Medical Imaging Signal Chain | Industrial Process Monitoring |
|---|---|
Use Scenario: Digitizing low-amplitude, high-frequency ultrasound echo signals in portable imaging devices with strict power and size constraints. IC Role / Device Role / Timing Role: Primary SAR ADC capturing 20kHz–30MHz band-limited signals with 92dB SNR and no missing codes to preserve diagnostic fidelity. Use Value: Extended 3.25µs acquisition time enables direct interface with low-power, low-noise transimpedance amplifiers, reducing total system power by >30% versus legacy solutions. | Use Scenario: High-precision monitoring of temperature, pressure, and flow sensors in distributed PLC I/O modules operating continuously at 85°C ambient. IC Role / Device Role / Timing Role: Isolated analog front-end ADC delivering calibrated 16-bit data at 250ksps with guaranteed stability over industrial temperature range. Use Value: ±2LSB INL max and 5ppm/°C reference drift tolerance ensure <0.005% measurement uncertainty across full operating range without field recalibration. |
| Portable Test Equipment | Automated Test Equipment (ATE) |
Use Scenario: Handheld oscilloscope or spectrum analyzer requiring battery life >8 hours while maintaining 16-bit resolution and 250ksps sampling. IC Role / Device Role / Timing Role: Low-power SAR ADC with 3.25mW active power and auto power-down between samples to extend runtime. Use Value: 1.7mA total supply current at 250ksps and 0.5µA shutdown current enable >10× longer battery life than comparable 16-bit ADCs. | Use Scenario: Multi-channel ATE system performing parallel parametric testing of ICs with synchronized sampling across 16+ channels. IC Role / Device Role / Timing Role: Daisy-chain configured ADC providing deterministic 250ksps throughput with zero inter-channel skew via shared SCK. Use Value: Single SCK/SDO bus reduces controller interface complexity by 80%, enabling scalable channel expansion without additional SPI peripherals. |
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, ±2.048V input range, SPI interface, no daisy-chain mode, 10.5mW at 1MSPS | Higher speed but narrower input range; lacks extended acquisition time and daisy-chain capability | Select when >250ksps throughput is required and system can accommodate higher power and reduced input span. |
| AD7961BCPZ | 16-bit, 5MSPS, 5V supply, ±5V input range, parallel/CMOS interface, 47mW at 5MSPS, no internal clock | Higher speed and wider input range but requires external timing, consumes >14× more power, larger footprint | Select for ultra-high-speed applications where parallel interface and external clocking are acceptable trade-offs. |
Compared with ADS8860IDRCT and AD7961BCPZ, the LTC2381IMS-16#PBF offers optimal balance of low power (3.25mW), deterministic latency-free timing, and daisy-chain scalability-making it uniquely suited for portable, multi-channel, and thermally constrained industrial systems where 250ksps is sufficient.
Availability
LTC2381IMS-16#PBF is available at Aetrix Electronics and suitable for medical imaging signal chains, industrial process monitoring, portable test equipment, and automated test equipment requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LTC2381IMS-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 LTC2381IMS-16#PBF belongs to ADI's precision SAR ADC product line, engineered for applications demanding high resolution, low power, and deterministic timing-including portable instrumentation, industrial automation, and medical diagnostics.
FAQ
What is the operating temperature range for the LTC2381IMS-16#PBF?
The LTC2381IMS-16#PBF is specified for operation from –40°C to +85°C (Industrial grade). All electrical characteristics-including INL, SNR, and power consumption-are guaranteed across this full range, with thermal resistance θJA = 110°C/W in the 16-lead MSOP package. This makes the LTC2381IMS-16#PBF suitable for deployment in uncontrolled industrial enclosures and outdoor instrumentation.
Does the LTC2381IMS-16#PBF require an external reference, and what are the key requirements?
Yes, the LTC2381IMS-16#PBF requires an external 2.4V–2.6V reference applied to the dual REF pins. Critical requirements include low noise (<10nV/√Hz), low temperature drift (≤5ppm/°C), and ability to supply up to 285µA DC load current at 250ksps. The LTC6652-2.5 is explicitly recommended and validated in the datasheet, with 47µF X5R ceramic decoupling required directly at the REF pins.
How does the daisy-chain mode work on the LTC2381IMS-16#PBF, and what is required to enable it?
Daisy-chain mode is enabled by driving the CHAIN pin (Pin 1) high. In this mode, RDL/SDI becomes a serial data input, allowing multiple LTC2381IMS-16#PBF devices to share one SCK and SDO line. Each device shifts its 16-bit result into the next downstream device on consecutive SCK edges. The first device's SDO connects to the host MCU, while subsequent devices receive data via RDL/SDI-reducing GPIO count and simplifying multi-channel designs.
What is the significance of the 3.25µs acquisition time in the LTC2381IMS-16#PBF, and how does it impact system design?
The 3.25µs acquisition time in the LTC2381IMS-16#PBF results from its proprietary architecture that overlaps acquisition with conversion. This extended window reduces required op-amp slew rate and output current by >5× versus standard SAR ADCs, enabling use of ultra-low-power drivers like the LT6350 (1.3mA quiescent) without degrading SNR or THD. It directly lowers system-level power and simplifies analog front-end design.
Can the LTC2381IMS-16#PBF operate with different I/O voltage levels, and how is this implemented?
Yes, the LTC2381IMS-16#PBF supports 1.8V, 2.5V, 3.3V, and 5V logic levels via the independent OVDD supply pin (Pin 15). VIH and VIL thresholds scale automatically as 0.8×OVDD and 0.2×OVDD respectively, ensuring reliable interface with mixed-voltage microcontrollers and FPGAs without level shifters. VDD (Pin 2) remains fixed at 2.5V for core logic, decoupled separately from OVDD.
LTC2381IMS-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 ~ 85°C
- Supplier Device Package:
- 16-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2381IMS-16#PBF FAQ
1.How can I place an order for LTC2381IMS-16#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2381IMS-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 LTC2381IMS-16#PBF reliable?
The price and inventory of LTC2381IMS-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 LTC2381IMS-16#PBF is usually 5 days.
3.What payment methods are accepted for LTC2381IMS-16#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2381IMS-16#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2381IMS-16#PBF?
LTC2381IMS-16#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2381IMS-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 LTC2381IMS-16#PBF?
For technical support, including LTC2381IMS-16#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2381IMS-16#PBF requirements.
6.How does Aetrix verify that LTC2381IMS-16#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2381IMS-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 LTC2381IMS-16#PBF meets industry standards.
7.What is the process for return or replacement of LTC2381IMS-16#PBF?
All LTC2381IMS-16#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2381IMS-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 LTC2381IMS-16#PBF part is unused and in its original packaging.
Return procedure for LTC2381IMS-16#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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