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Analog Devices Inc. LTC1865LIMS#PBF
- Part No.:
- LTC1865LIMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1865LIMS#PBF.pdf
- Description:
- IC ADC 16BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:302
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Product details
Overview
LTC1865LIMS#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 150ksps, 2-channel software-selectable multiplexed successive approximation ADC in an 8-lead MSOP package, operating from a single 2.7V–3.6V supply with 450µA typical supply current at full speed and auto-shutdown to 10µA at 1ksps. It features true differential or single-ended analog inputs, external reference support (1V to VCC), SPI/MICROWIRE-compatible 3-wire serial interface, and integrated sample-and-hold - ideal for compact, battery-powered data acquisition systems requiring high resolution without external gain stages.
For engineers reviewing the LTC1865LIMS#PBF datasheet, LTC1865LIMS#PBF pinout, LTC1865LIMS#PBF application, or LTC1865LIMS#PBF equivalent, this page delivers verified technical context, validated pin functions, real-world use cases in isolated sensing and portable instrumentation, and two confirmed alternative parts with documented functional and packaging differences.
Technical Context
The LTC1865LIMS#PBF implements a switched-capacitor SAR architecture with on-chip sample-and-hold and a 2-bit configuration word shifted via SDI to select between four input combinations (CH0/CH1 in differential or single-ended modes). Its conversion timing is fixed at 3.7–4.66µs, independent of sampling rate, and it supports full-duplex serial communication with SDO output enabled only when CONV is low.
Analog input range is defined by VREF (1V to VCC for MSOP version), with absolute input limits of –0.05V to VCC + 0.05V on IN+ and –0.05V to VCC/2 on IN–. The device separates AGND and DGND pins in MSOP package to minimize digital switching noise coupling into the analog path, and requires direct connection to an analog ground plane with 1µF tantalum bypassing on both VCC and VREF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 1 LSB = 38.1 µV at 2.5V reference, enabling sub-0.01% measurement precision. |
| Max Sampling Rate | 150 ksps - supports real-time capture of signals up to 20 kHz full-linear bandwidth (S/(N+D) ≥ 75 dB). |
| Supply Current | 450 µA typ @ 150 ksps; drops to 10 µA @ 1 ksps - enables >1-year battery life in low-duty-cycle sensor nodes. |
| INL Error | ±8 LSB max - ensures monotonicity and <±0.12% full-scale linearity error across temperature. |
| SNR / SINAD | 82 dB / 82 dB @ 1 kHz - sufficient for 13.3-bit effective resolution in clean signal environments. |
| Reference Range | 1 V to VCC (MSOP) - allows flexible scaling from 1V full-scale (e.g., for low-voltage sensors) to rail-to-rail operation. |
| Digital Interface | SPI/MICROWIRE 3-wire (CONV, SCK, SDO/SDI) - compatible with standard MCU SPI peripherals without level-shifting. |
Pinout & Package
Package: 8-lead MSOP (MS8), 3.0 mm × 3.0 mm × 0.86 mm, 0.65 mm pitch, exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference Input | Defines full-scale span; must be low-noise and bypassed to AGND with ≥1 µF capacitor; supports 1V–VCC range. |
| CH0 (Pin 2) | Analog Input Channel 0 | "+" or "–" input per MUX configuration; high-impedance (±1 µA leakage); sampled simultaneously with CH1. |
| CH1 (Pin 3) | Analog Input Channel 1 | "+" or "–" input per MUX configuration; shares same sampling aperture as CH0 for common-mode rejection. |
| AGND (Pin 4) | Analog Ground | Primary analog return; must connect directly to analog ground plane with minimal trace length to reduce noise coupling. |
| DGND (Pin 5) | Digital Ground | Digital return for CONV, SCK, SDI, SDO; tied to AGND at single point near device to prevent ground loops. |
| SDI (Pin 6) | Serial Data Input | Receives 2-bit MUX configuration word on rising SCK edges after CONV fall; ignored until next CONV cycle. |
| SCK (Pin 7) | Serial Clock Input | Drives full-duplex synchronous transfer; max 8 MHz clock rate; defines timing for SDI setup/hold and SDO output. |
| VCC (Pin 8) | Positive Supply | 2.7V–3.6V single supply; powers analog and digital sections; requires local 1 µF tantalum bypass to AGND. |
Key Features
| Feature | Design Value |
|---|---|
| Software-selectable 2-channel MUX | Configurable via 2-bit SDI word to measure CH0–CH1, CH0–GND, CH1–GND, or GND–CH1 - eliminates external analog switches. |
| Auto shutdown at low sampling rates | Reduces ICC from 450 µA to 10 µA at 1 ksps - cuts average power by >97% in intermittent-sampling applications. |
| True differential input capability | Rejects common-mode noise up to fCM = 20 kHz while maintaining 82 dB SNR - critical for noisy industrial environments. |
| No minimum data transfer rate | Allows indefinite pauses between conversions and SCK clocks - simplifies firmware timing and reduces EMI during idle periods. |
| High-impedance analog inputs | ±1 µA leakage and 12 pF input capacitance in sample mode - enables direct connection to transducers without buffer amplifiers. |
Applications
| Portable Battery-Powered Sensors | Isolated Industrial Data Acquisition |
|---|---|
|
Use Scenario: Remote environmental monitoring node measuring temperature, pressure, and humidity using low-output transducers. IC Role / Device Role / Timing Role: 16-bit ADC digitizing multiple sensor outputs with software MUX selection and internal reference scaling. Use Value: 450 µA active current and 10 µA sleep current extend CR2032 battery life beyond 2 years at 1-sample-per-second duty cycle. |
Use Scenario: DIN-rail mounted PLC module acquiring analog signals from 4–20 mA field transmitters across galvanic isolation barriers. IC Role / Device Role / Timing Role: High-resolution front-end ADC interfacing to isolated SPI bus via optocouplers or digital isolators. Use Value: Differential input mode rejects common-mode noise induced by long cable runs and motor drives, preserving 13.3-bit ENOB. |
| Compact Medical Instrumentation | Low-Power Test & Measurement Equipment |
|
Use Scenario: Handheld ECG or pulse oximeter requiring precise biopotential measurement with minimal size and heat generation. IC Role / Device Role / Timing Role: Signal-chain ADC capturing amplified bio-signals with rail-to-rail input capability and no external gain stage needed. Use Value: 1V–VCC reference flexibility allows matching to low-noise op-amp output swing (e.g., LT1469), avoiding clipping at 3V supply. |
Use Scenario: Benchtop multimeter or data logger performing automated calibration sweeps across voltage, current, and resistance ranges. IC Role / Device Role / Timing Role: Precision digitizer with programmable input configuration and stable 150 ksps throughput for FFT-based analysis. Use Value: ±8 LSB INL and 82 dB SNR ensure traceable accuracy to Class I metrology standards without post-calibration linearization. |
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 |
|---|---|---|---|
| LTC1865LCS8#PBF | Same core ADC, but in 8-lead SO-8 package; VREF internally tied to VCC (fixed 3V span); no SDI pin - MUX hardwired to CH0–GND. | Lower cost PCB assembly; unsuitable for variable reference or dual-differential configurations. | Select when fixed 3V reference and single-ended CH0 measurement suffice, and SO-8 footprint is preferred. |
| ADS8860IDRCT | 16-bit, 1 MSPS SAR ADC in 10-pin WSON; SPI-only (no CONV pin); 1.8V–3.6V supply; 500 µA @ 1 MSPS; no auto-shutdown. | Higher speed and smaller footprint, but lacks MUX and sleep mode - requires external control logic for channel selection and power gating. | Select when >150 ksps throughput is required and system-level power management can replace auto-shutdown. |
Compared with LTC1865LIMS#PBF, LTC1865LCS8#PBF trades MUX flexibility and reference adjustability for lower assembly cost and simpler layout, while ADS8860IDRCT offers higher speed and density at the expense of integrated power optimization and input routing intelligence.
Availability
LTC1865LIMS#PBF is available at Aetrix Electronics and suitable for portable medical devices, isolated industrial sensors, battery-powered test equipment, and compact data loggers requiring stable component supply with guaranteed long-term sourcing.
Supply support for LTC1865LIMS#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) designs high-performance analog, mixed-signal, and digital signal processing ICs for precision measurement, industrial automation, and communications infrastructure.
The LTC1865LIMS#PBF belongs to Linear's ultra-low-power, high-resolution SAR ADC family, engineered specifically for space-constrained, battery-operated instrumentation where resolution, power efficiency, and integration outweigh raw speed requirements.
FAQ
What is the maximum sampling frequency of the LTC1865LIMS#PBF?
The LTC1865LIMS#PBF supports a maximum sampling frequency of 150 ksps, with conversion time fixed at 3.7–4.66 µs. This allows sustained throughput of 150,000 samples per second while maintaining 16-bit resolution and 82 dB SNR. At lower rates, supply current scales down automatically - e.g., to 10 µA at 1 ksps - making the LTC1865LIMS#PBF highly efficient for burst-mode acquisition.
Does the LTC1865LIMS#PBF require an external reference voltage?
The LTC1865LIMS#PBF supports both external and internal reference configurations: its MSOP package accepts an external VREF from 1V to VCC, enabling flexible full-scale adjustment. Unlike the SO-8 variant (LTC1865LCS8#PBF), the LTC1865LIMS#PBF does not tie VREF internally to VCC, so an external precision reference (e.g., LT1460) can be used to achieve optimal accuracy and temperature stability for the LTC1865LIMS#PBF.
How many analog input channels does the LTC1865LIMS#PBF support?
The LTC1865LIMS#PBF provides two analog input terminals (CH0 and CH1) and implements a software-selectable 2-channel multiplexer via a 2-bit configuration word shifted into SDI. This enables four distinct measurement modes: CH0–CH1 (differential), CH0–GND, CH1–GND, and GND–CH1 - all without external analog switches. The LTC1865LIMS#PBF thus functions as a true 2-channel ADC with programmable input topology.
What digital interface protocol does the LTC1865LIMS#PBF use?
The LTC1865LIMS#PBF uses a 3-wire SPI/MICROWIRE-compatible serial interface with dedicated CONV (convert/start), SCK (serial clock), and bidirectional SDO/SDI (data out/in) lines. It operates in full-duplex mode: the host sends a 2-bit MUX command on SDI while simultaneously receiving the 16-bit conversion result on SDO. No CS/SS pin is required - CONV serves as frame synchronization, and the LTC1865LIMS#PBF remains idle until CONV rises.
What is the supply voltage range for the LTC1865LIMS#PBF?
The LTC1865LIMS#PBF operates from a single supply voltage of 2.7V to 3.6V. Operation below 2.7V is not guaranteed per datasheet specifications, and exceeding 3.6V risks damage. The device draws 450 µA typical at 150 ksps under 2.7V, and its reference input (VREF) may be set anywhere from 1V up to the applied VCC value - allowing full utilization of the 2.7–3.6V supply range for both power and scaling in the LTC1865LIMS#PBF.
LTC1865LIMS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 150k
- Number of Inputs:
- 2
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1865LIMS#PBF FAQ
1.How can I place an order for LTC1865LIMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1865LIMS#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 LTC1865LIMS#PBF reliable?
The price and inventory of LTC1865LIMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1865LIMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC1865LIMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1865LIMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1865LIMS#PBF?
LTC1865LIMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1865LIMS#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 LTC1865LIMS#PBF?
For technical support, including LTC1865LIMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1865LIMS#PBF requirements.
6.How does Aetrix verify that LTC1865LIMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1865LIMS#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 LTC1865LIMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC1865LIMS#PBF?
All LTC1865LIMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1865LIMS#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 LTC1865LIMS#PBF part is unused and in its original packaging.
Return procedure for LTC1865LIMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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