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Analog Devices Inc. LTC2381CMS-16#TRPBF
- Part No.:
- LTC2381CMS-16#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2381CMS-16#TRPBF.pdf
- Description:
- IC ADC 16BIT SAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,110
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Product details
Overview
LTC2381CMS-16#TRPBF 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 and supports 1.8V–5V I/O logic via separate OVDD, making it suitable for high-speed data acquisition in portable instrumentation and industrial control systems.
For engineers reviewing the LTC2381CMS-16#TRPBF datasheet, LTC2381CMS-16#TRPBF pinout, LTC2381CMS-16#TRPBF application, or LTC2381CMS-16#TRPBF equivalent, key selection considerations include guaranteed 16-bit no-missing-codes operation, extended 3.25µs acquisition time enabling low-power ADC drivers, SPI-compatible serial interface with daisy-chain mode, internal conversion clock, and operation up to 70°C in the MSOP-16 package.
Technical Context
The LTC2381CMS-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 fully differential SAR core uses a 16-bit CDAC and precision comparator referenced to an external 2.5V source, delivering bipolar 2's complement output codes with ±2LSB integral linearity over temperature.
Timing is governed by an internal oscillator, freeing the host from precise clock synchronization. The CNV-controlled conversion sequence initiates on rising edge, asserts BUSY high during conversion (2–3µs), and powers down automatically between conversions-reducing idle current to 0.5µA while maintaining full 250ksps throughput when active.
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 - fixed maximum throughput with no latency; enables real-time capture of signals up to ~125kHz Nyquist bandwidth. |
| SNR | 92dB (typ) at fIN = 20kHz - defines usable dynamic range of ~15.3 effective bits for clean signal digitization. |
| INL | ±2LSB (max) - ensures end-point linearity error remains within ±0.03% of full-scale range (±2.5V). |
| Power @ 250ksps | 3.25mW - achieved with 2.5V VDD and 2.5V OVDD; scales linearly to 13µW at 1ksps for battery-constrained use. |
| Input Range | ±2.5V fully differential - requires external 2.4V–2.6V reference; supports true bipolar signal acquisition without level-shifting. |
| Acquisition Time | 3.25µs - extended window eases drive requirements, permitting use of ultra-low-power op-amps like LT6350. |
Pinout & Package
Package: 16-lead plastic MSOP (4mm × 5mm), RoHS-compliant, lead-free finish. Exposed pad not present in MSOP variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CHAIN (1) | Mode selector | High enables daisy-chain serial input (SDI); low configures RDL/SDI as bus enable for SDO tri-state control. |
| VDD (2) | Digital core supply | 2.375V–2.625V supply for ADC logic and CDAC; bypass with 10µF ceramic capacitor to GND. |
| GND (3,6,10,16) | Ground reference | Four dedicated ground pins minimize ground bounce; must be connected to low-impedance PCB ground plane. |
| IN+, IN– (4,5) | Differential analog inputs | Accept ±2.5V differential swing; input capacitance 45pF (sample), 5pF (hold); require matched layout and low-noise driver. |
| REF (7,8) | Reference voltage input | 2.4V–2.6V external reference; draws up to 285µA at 250ksps; bypass with 47µF X5R ceramic capacitor. |
| CNV (9) | Convert trigger | Rising-edge initiated conversion; high state enables auto power-down between conversions. |
| BUSY (11) | Conversion status indicator | Active-high open-drain output; asserts high at conversion start, returns low after 2–3µs when result ready. |
| RDL/SDI (12) | Serial bus control / data input | In Normal Mode (CHAIN=low): controls SDO output enable; in Chain Mode (CHAIN=high): accepts serial data from upstream ADC. |
| SCK (13) | Serial clock input | Accepts 10ns min pulse width (100MHz max); clocks out 16-bit 2's complement data MSB-first on rising edge. |
| SDO (14) | Serial data output | Tri-stateable output; drives conversion result or daisy-chained data; compatible with 1.8V–5V logic levels via OVDD. |
| OVDD (15) | I/O interface supply | 1.71V–5.25V supply setting logic voltage level for SDO, SCK, RDL/SDI, CHAIN, CNV, BUSY; bypass with 0.1µF capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay / zero cycle latency | Enables deterministic timing for closed-loop control and real-time triggering without output buffering or latency compensation. |
| Extended 3.25µs acquisition time | Reduces required drive strength by >5× versus standard SAR ADCs, allowing use of micropower amplifiers (e.g., LT6350) without gain error or distortion penalty. |
| Internal conversion clock | Eliminates need for external high-frequency clock source and associated jitter-sensitive routing; simplifies system timing design. |
| Auto power-down between conversions | Reduces average power proportionally to sampling rate-drops to 13µW at 1ksps-critical for battery-powered portable instrumentation. |
| SPI-compatible interface with daisy-chain mode | Supports multi-ADC synchronization using single SCK and SDO lines; reduces GPIO count and PCB routing complexity in channel-dense systems. |
| Guaranteed operation to 70°C | Validated performance across full industrial ambient range; enables deployment in compact enclosures without forced cooling. |
Applications
| Medical Imaging Signal Acquisition | Portable Data Logger |
|---|---|
|
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 analog front-end outputs with minimal added noise and distortion. Use Value: 92dB SNR and ±2LSB INL preserve diagnostic image fidelity; 3.25µs acquisition time permits use of low-quiescent-current transimpedance amplifiers to extend battery life. |
Use Scenario: Battery-operated environmental sensor node recording temperature, pressure, and humidity over extended periods. IC Role / Device Role / Timing Role: Low-power ADC sampling multiple channels at sub-ksps rates with wake-on-event capability. Use Value: 13µW power at 1ksps and automatic power-down reduce average system current; SPI interface enables direct connection to ultra-low-power MCU. |
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|
Use Scenario: Real-time monitoring of motor phase currents and voltages in variable-frequency drives. IC Role / Device Role / Timing Role: High-speed, isolated ADC capturing synchronized current/voltage waveforms for torque and efficiency calculation. Use Value: 250ksps throughput captures full 50/60Hz harmonics up to 10th order; ±2.5V differential input rejects common-mode noise from switching inverters. |
Use Scenario: Precision DC parametric testing of ICs requiring accurate voltage/current measurement at multiple test points. IC Role / Device Role / Timing Role: Reference-grade ADC providing traceable 16-bit measurements in calibrated ATE fixture backplanes. Use Value: Guaranteed no-missing-codes and ±2LSB INL ensure measurement repeatability; external 2.5V reference (e.g., LTC6652-2.5) enables <0.5LSB total error calibration. |
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, 2.5V supply, ±2.5V input, but requires external clock and has 1.5µs acquisition time. | Higher resolution/speed, but demands higher drive strength and adds clock distribution complexity. | Select when >16-bit resolution and >250ksps throughput are mandatory; avoid if power or layout simplicity are primary constraints. |
| ADS8860IRGET | 16-bit, 1MSPS, 2.5V supply, pseudo-differential input (single-ended IN+ with IN– tied to VCM), 1.25µs acquisition. | Lower power (1.5mW), but lacks true differential input and extended acquisition time; limited common-mode rejection. | Select for cost-sensitive, single-ended signal chains where CMRR >70dB is not required; not suitable for noisy industrial environments. |
Compared with AD7960BCPZ-RL7 and ADS8860IRGET, the LTC2381CMS-16#TRPBF uniquely balances 250ksps throughput, true differential input, extended acquisition time, and ultra-low idle power-making it optimal for portable, noise-immune, and battery-aware high-fidelity data acquisition.
Availability
LTC2381CMS-16#TRPBF is available at Aetrix Electronics and suitable for medical imaging signal acquisition, portable data logging, and industrial process monitoring requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC2381CMS-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 LTC2381-16 belongs to ADI's precision SAR ADC product line, designed specifically for applications demanding high dynamic range, low power, and deterministic timing-such as portable instrumentation, industrial automation, and medical diagnostics.
FAQ
What is the operating temperature range for the LTC2381CMS-16#TRPBF?
The LTC2381CMS-16#TRPBF is specified for 0°C to 70°C ambient operation. This commercial-grade temperature range is validated across all electrical parameters including INL, SNR, and power consumption. It is distinct from the I-grade (–40°C to 85°C) and H-grade (–40°C to 125°C) variants, which carry different part number suffixes (e.g., LTC2381IMS-16#TRPBF). Thermal derating is not required within this range.
Does the LTC2381CMS-16#TRPBF require an external clock source?
No, the LTC2381CMS-16#TRPBF integrates 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 and accepts up to 100MHz, but does not control conversion initiation or duration. Conversion is triggered exclusively by the CNV pin rising edge, and BUSY indicates completion.
Can the LTC2381CMS-16#TRPBF interface directly with a 1.8V microcontroller?
Yes. The LTC2381CMS-16#TRPBF supports 1.8V logic levels via its OVDD supply pin, which accepts 1.71V to 5.25V. When OVDD = 1.8V, all digital I/O (SCK, SDO, RDL/SDI, CHAIN, CNV, BUSY) operate at 1.8V-compatible voltage thresholds-enabling direct connection to 1.8V MCUs without level shifters, provided VDD remains at 2.5V for analog core operation.
What reference voltage source is recommended for the LTC2381CMS-16#TRPBF?
The LTC6652-2.5 is explicitly recommended in the datasheet for the LTC2381CMS-16#TRPBF. It delivers 2.5V output with 0.05% initial accuracy and 5ppm/°C max drift-ensuring <0.5LSB reference error across temperature. Its 47µF bypass requirement matches the REF pin's charge demand, and its H-grade version supports operation up to 125°C, aligning with higher-temp LTC2381 variants.
How does the daisy-chain mode work on the LTC2381CMS-16#TRPBF?
In daisy-chain mode (CHAIN pin high), the RDL/SDI pin becomes SDI, accepting serial data from the SDO of a preceding LTC2381-16 in the chain. Multiple devices share one SCK and one SDO line; the host clocks out all concatenated 16-bit results sequentially. Each device asserts BUSY independently, but conversion must be synchronized externally-typically via shared CNV-to ensure aligned sampling across the chain.
LTC2381CMS-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:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2381CMS-16#TRPBF FAQ
1.How can I place an order for LTC2381CMS-16#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2381CMS-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 LTC2381CMS-16#TRPBF reliable?
The price and inventory of LTC2381CMS-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 LTC2381CMS-16#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2381CMS-16#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2381CMS-16#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2381CMS-16#TRPBF?
LTC2381CMS-16#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2381CMS-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 LTC2381CMS-16#TRPBF?
For technical support, including LTC2381CMS-16#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2381CMS-16#TRPBF requirements.
6.How does Aetrix verify that LTC2381CMS-16#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2381CMS-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 LTC2381CMS-16#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2381CMS-16#TRPBF?
All LTC2381CMS-16#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2381CMS-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 LTC2381CMS-16#TRPBF part is unused and in its original packaging.
Return procedure for LTC2381CMS-16#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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