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Analog Devices Inc. LTC2381IMS-16#TRPBF
- Part No.:
- LTC2381IMS-16#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2381IMS-16#TRPBF.pdf
- Description:
- IC ADC 16BIT SAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,888
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Product details
Overview
LTC2381IMS-16#TRPBF 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 (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 targets high-speed data acquisition in portable instrumentation and industrial control.
For engineers reviewing the LTC2381IMS-16#TRPBF datasheet, LTC2381IMS-16#TRPBF pinout, LTC2381IMS-16#TRPBF application, or LTC2381IMS-16#TRPBF equivalent, key selection criteria include guaranteed 16-bit no-missing-codes operation, extended 3.25µs acquisition time enabling low-power driver usage, SPI-compatible serial interface with daisy-chain mode, internal conversion clock, and –40°C to +85°C industrial temperature rating.
Technical Context
The LTC2381IMS-16#TRPBF 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 fixes conversion time at 2–3µs, decoupling timing from external clocks.
It features a fully differential input stage with 45pF sampling capacitance and 40Ω switch on-resistance, requiring precise common-mode biasing at VREF/2. The reference input accepts an external 2.4V–2.6V source, drawing up to 285µA at 250ksps, and the ADC outputs 2's complement 16-bit data via MSB-first SPI interface with BUSY and CNV handshaking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees monotonic transfer function and no missing codes across full temperature range. |
| Sampling Rate | 250ksps - maximum sustained throughput with no latency between conversions. |
| INL (Max) | ±2 LSB - ensures end-point linearity error remains within ±0.03% of full-scale range (±2.5V). |
| SNR (Typ) | 92 dB at fIN = 20kHz - enables >15 effective bits of dynamic resolution for precision signal capture. |
| Power (250ksps) | 3.25 mW - ultra-low active power enables battery-operated or thermally constrained designs. |
| Acquisition Time | 3.25 µs - extended hold window reduces required drive strength and permits use of low-power op-amps (e.g., LT6350). |
| Input Range | ±2.5V differential - supports wide dynamic range without external gain/attenuation for bipolar signals. |
| Reference Input | 2.4V–2.6V external - requires stable, low-noise reference (e.g., LTC6652-2.5) for full performance. |
Pinout & Package
Package: 16-lead plastic MSOP (4mm × 5mm), exposed pad not present (MSOP variant). Operating temperature range: –40°C to +85°C (I-grade).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CHAIN) | Chain Mode Selector | High enables daisy-chain SPI mode (RDL/SDI becomes SDI); low enables normal bus-enable mode (RDL/SDI controls SDO tri-state). |
| 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 noise coupling; must be connected to low-impedance PCB ground plane. |
| 4 (IN+), 5 (IN–) | Differential Analog Inputs | Accept ±2.5V differential signal; input impedance modeled as 45pF || 40Ω during acquisition; require matched layout and common-mode bias at VREF/2. |
| 7,8 (REF) | Reference Voltage Input | 2.4V–2.6V external reference; draws pulsed current up to 285µA at 250ksps; bypass with 47µF X5R ceramic (0805). |
| 9 (CNV) | Convert Trigger | Rising edge initiates conversion; held high after conversion to auto-power-down; low before next conversion to power up. |
| 11 (BUSY) | Conversion Status Indicator | Active-high open-drain output signals conversion progress; used for timing synchronization or interrupt generation. |
| 12 (RDL/SDI) | Serial Data Control / Input | In Normal Mode (CHAIN = low): bus enable for SDO; in Chain Mode (CHAIN = high): serial data input for daisy-chained devices. |
| 13 (SCK) | Serial Clock Input | Accepts 10ns min period (100MHz max) clock; controls data shift-out timing on SDO and data sampling on RDL/SDI. |
| 14 (SDO) | Serial Data Output | 2's complement 16-bit result shifted MSB-first; tri-stated when RDL/SDI = low in Normal Mode. |
| 15 (OVDD) | I/O Interface Supply | 1.71V–5.25V logic-level supply for SDO, SCK, RDL/SDI, BUSY; sets VIH/VIL thresholds and drives capability. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay, zero cycle latency | Enables deterministic real-time control loops and eliminates FIFO buffering requirements in closed-loop systems. |
| Extended 3.25µs acquisition time | Reduces required op-amp slew rate and bandwidth, allowing use of lower-power, lower-cost drivers like LT6350. |
| SPI-compatible interface with daisy-chain mode | Supports multi-ADC synchronization without additional GPIOs; simplifies PCB routing and firmware for channel expansion. |
| Internal conversion clock | Removes need for external timing circuitry; improves system jitter immunity and reduces BOM count. |
| Auto power-down between conversions | Reduces average power to 13µW at 1ksps, extending battery life in intermittent-sampling applications. |
| Guaranteed operation to 125°C (H-grade variants) | Validates thermal robustness for industrial and automotive under-hood environments (note: this part is I-grade, –40°C to +85°C). |
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 SAR ADC capturing 20kHz–5MHz band-limited signals with minimal added noise or distortion. Use Value: 92dB SNR and 107dB SFDR preserve weak echo fidelity; ±2LSB INL ensures accurate amplitude quantization across dynamic range. |
Use Scenario: High-resolution voltage/current measurement in battery-powered multimeters and oscilloscope front-ends. IC Role / Device Role / Timing Role: Precision digitizer interfacing with low-noise amplifier and anti-alias filter stages. Use Value: 3.25mW active power extends operating time; 3.25µs acquisition time relaxes op-amp drive requirements, lowering system cost. |
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|
Use Scenario: Continuous monitoring of sensor outputs (e.g., strain gauges, RTDs) in PLC analog input modules. IC Role / Device Role / Timing Role: High-accuracy, low-drift ADC with external reference for calibrated measurements over temperature. Use Value: Guaranteed no-missing-codes and ±2LSB INL ensure traceable metrology; –40°C to +85°C rating supports uncontrolled cabinet environments. |
Use Scenario: High-throughput parametric testing of ICs requiring synchronized multi-channel sampling at 250ksps. IC Role / Device Role / Timing Role: Timing-critical ADC with deterministic CNV-to-BUSY timing and daisy-chain support for parallel channel capture. Use Value: Zero-cycle latency and internal clock eliminate inter-channel skew; SPI daisy-chain reduces controller pin count for 8+ channel systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-power SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7960BCPZ-RL7 | 18-bit, 5MSPS, requires external reference and separate VDRIVE; higher power (34mW), no integrated oscillator. | Better resolution/speed but demands more complex power and timing design; unsuitable for ultra-low-power or space-constrained layouts. | Select when >16-bit resolution and >1MSPS throughput are mandatory; avoid if board area, power budget, or timing simplicity are critical. |
| ADS8860IRGET | 16-bit, 1MSPS, SPI-only, 2.5V supply only; 12.5mW at 1MSPS; no daisy-chain mode; smaller 3mm × 3mm VQFN package. | Higher speed and smaller footprint but lacks extended acquisition time and industrial temperature grade (–40°C to +85°C only). | Select for compact, high-speed designs where driver complexity is already managed; avoid when extended acquisition or robust industrial temp range is required. |
Compared with AD7960BCPZ-RL7 and ADS8860IRGET, the LTC2381IMS-16#TRPBF uniquely balances 250ksps throughput, 3.25mW power, 3.25µs acquisition time, and SPI daisy-chain capability in an industrial-grade MSOP package-making it optimal for portable, thermally sensitive, or multi-channel synchronized systems where timing simplicity and power efficiency are prioritized over raw speed or bit depth.
Availability
LTC2381IMS-16#TRPBF 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 lifecycle support, and guaranteed industrial temperature performance.
Supply support for LTC2381IMS-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, formed through the acquisition of Linear Technology in 2017.
The LTC2381IMS-16#TRPBF 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#TRPBF?
The LTC2381IMS-16#TRPBF is rated for –40°C to +85°C (I-grade), validated across this full range for parameters including INL, SNR, and power consumption. This makes it suitable for industrial enclosures and outdoor portable equipment where ambient temperatures vary widely. The H-grade variant (LTC2381HMS-16#TRPBF) extends to 125°C, but the IMS version does not.
Does the LTC2381IMS-16#TRPBF require an external clock source?
No, the LTC2381IMS-16#TRPBF includes an internal oscillator that sets conversion timing, eliminating the need for an external clock. The SCK pin is used solely for serial data transfer timing-not for ADC core operation-so system timing is simplified and jitter-sensitive external clocks are unnecessary for basic functionality.
Can the LTC2381IMS-16#TRPBF interface directly with a 1.8V microcontroller?
Yes. The LTC2381IMS-16#TRPBF supports OVDD from 1.71V to 5.25V, so setting OVDD = 1.8V configures all digital I/O (SCK, SDO, RDL/SDI, BUSY) to 1.8V logic levels. VDD remains at 2.5V for core operation, enabling seamless interfacing with 1.8V host processors without level shifters.
What reference voltage source is recommended for the LTC2381IMS-16#TRPBF?
The LTC6652-2.5 is explicitly recommended in the datasheet: a 2.5V precision reference with 0.05% initial accuracy and 5ppm/°C drift, fully specified over –40°C to +125°C. Its low noise and fast settling match the LTC2381IMS-16#TRPBF's 285µA pulsed REF current demand, preserving 92dB SNR and ±2LSB INL performance.
How does the daisy-chain mode work on the LTC2381IMS-16#TRPBF?
When CHAIN = high, the LTC2381IMS-16#TRPBF enters daisy-chain mode: RDL/SDI becomes SDI (serial data input), and SDO connects to the next device's SDI. Multiple LTC2381IMS-16#TRPBF units share one SCK and CNV, with BUSY indicating completion. This enables synchronized multi-channel sampling using a single SPI bus and minimal GPIOs.
LTC2381IMS-16#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width)
- 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-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2381IMS-16#TRPBF FAQ
1.How can I place an order for LTC2381IMS-16#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2381IMS-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 LTC2381IMS-16#TRPBF reliable?
The price and inventory of LTC2381IMS-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 LTC2381IMS-16#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2381IMS-16#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2381IMS-16#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2381IMS-16#TRPBF?
LTC2381IMS-16#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2381IMS-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 LTC2381IMS-16#TRPBF?
For technical support, including LTC2381IMS-16#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2381IMS-16#TRPBF requirements.
6.How does Aetrix verify that LTC2381IMS-16#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2381IMS-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 LTC2381IMS-16#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2381IMS-16#TRPBF?
All LTC2381IMS-16#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2381IMS-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 LTC2381IMS-16#TRPBF part is unused and in its original packaging.
Return procedure for LTC2381IMS-16#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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