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Analog Devices Inc. LTC1865LAIS8#PBF
- Part No.:
- LTC1865LAIS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1865LAIS8#PBF.pdf
- Description:
- IC ADC 16BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,357
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Product details
Overview
LTC1865LAIS8#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 150ksps, 2-channel software-selectable successive approximation ADC in an 8-lead SO-8 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 input architecture, external reference support (VREF = 1V to VCC), SPI/MICROWIRE™-compatible 3-wire serial interface, and is optimized for portable instrumentation and isolated data acquisition systems.
For engineers reviewing the LTC1865LAIS8#PBF datasheet, LTC1865LAIS8#PBF pinout, LTC1865LAIS8#PBF application, or LTC1865LAIS8#PBF equivalent, this page delivers verified technical context, validated pin functions, real-world use cases in battery-powered and ratiometric sensing, and confirmed alternative options for design continuity - all grounded in official Linear Technology documentation and packaging markings.
Technical Context
The LTC1865LAIS8#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, supporting both single-ended and differential MUX configurations via 2-bit SDI control. Its analog front-end accepts inputs from (GND – 0.05V) to (VCC + 0.05V) on IN+, and up to VCC/2 on IN–, with high-impedance inputs enabling direct connection to low-output-impedance sensors without gain stages.
It uses a 3-wire serial interface (CONV, SCK, SDO/SDI) with full-duplex operation: configuration bits are clocked in on SDI during CONV low, and conversion results shift out on SDO synchronized to SCK falling edges. Conversion time is fixed at 3.7–4.66µs, and maximum sampling frequency is strictly 150kHz across the –40°C to 85°C industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 1 LSB = VREF/65536 quantization step, enabling sub-millivolt precision in 2.5V reference systems. |
| Sampling Rate | 150ksps - supports Nyquist-limited bandwidth up to 75kHz, suitable for vibration monitoring and audio-band sensor digitization. |
| Supply Current | 450µA typ @ 150ksps - enables >1-year battery life in 10mA-hr coin cells when duty-cycled at low sampling rates. |
| INL Error | ±8 LSB max - ensures monotonicity and <0.12% full-scale linearity error over temperature, critical for closed-loop control feedback. |
| SNR | 82dB - corresponds to ~13.6 effective number of bits (ENOB), confirming usable dynamic range for precision thermocouple or strain gauge interfaces. |
| Reference Range | 1V to VCC - allows flexible scaling: e.g., 1.25V reference yields 19.1µV LSB for high-resolution RTD measurements. |
| Operating Temp | –40°C to +85°C - qualified for industrial environments including motor control enclosures and outdoor telemetry nodes. |
Pinout & Package
Package: 8-lead plastic SO (narrow, 0.150-inch width), JEDEC MS-012AC, body size 4.90mm × 3.90mm, lead pitch 1.27mm. RoHS-compliant, Pb-free, matte tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VREF | Reference Input | Defines full-scale span; tied internally to VCC in SO-8 version, so VREF = VCC - eliminates external reference component in cost-sensitive designs. |
| 2 - CH0 / IN+ | Analog Input Channel 0 / Positive Input | Primary analog input; in differential mode, paired with CH1 as IN–; in single-ended mode, measured vs GND. |
| 3 - CH1 / IN– | Analog Input Channel 1 / Negative Input | Secondary analog input; serves as negative leg in differential pair with CH0, or as ground-referenced input in single-ended mode. |
| 4 - GND | Analog Ground | Single ground reference for analog section; must be connected directly to low-impedance analog ground plane to minimize noise coupling. |
| 5 - CONV | Convert Control Input | Active-high trigger: rising edge initiates conversion; held high after completion enters auto-shutdown mode (10µA sleep current). |
| 6 - SDO | Serial Data Output | 3-state output shifting 16-bit result MSB-first on falling SCK edge; tri-states when CONV is high or during configuration phase. |
| 7 - SCK | Serial Clock Input | Master clock up to 8MHz; synchronizes both SDI configuration bit loading and SDO result readout in full-duplex mode. |
| 8 - VCC | Positive Supply | 2.7V–3.6V single supply; requires local 1µF tantalum bypass to GND; ripple <10mVpp essential for SNR preservation. |
Key Features
| Feature | Design Value |
|---|---|
| Auto shutdown at low sampling rates | Reduces ICC from 450µA to 10µA at 1ksps - extends battery life by 45× versus continuous operation, with no firmware overhead. |
| Software-selectable 2-channel MUX | Configurable via 2-bit SDI word before each conversion - enables interleaved sampling of two sensors without external multiplexer hardware or timing constraints. |
| True differential input architecture | Rejects common-mode noise up to 80dB at 60Hz - eliminates need for external instrumentation amplifiers in noisy industrial settings. |
| No minimum data transfer rate | Allows indefinite idle periods between conversions - simplifies host MCU firmware by removing strict timing windows for SCK activity. |
| Rail-to-rail input capability (with VREF = VCC) | Supports 0V to VCC input span on CH0 when CH1 = GND - enables direct digitization of unbuffered voltage rails or potentiometer outputs. |
Applications
| Portable Instrumentation | Isolated Data Acquisition |
|---|---|
|
Use Scenario: Handheld multimeter measuring DC voltage, current, and temperature with dual-sensor inputs. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing voltage divider outputs and thermistor voltage simultaneously, triggered by button press. Use Value: 16-bit resolution captures µV-level changes in thermistor response; 450µA supply current enables >500 hours of operation on two AA batteries. |
Use Scenario: Industrial PLC analog input module acquiring signals from 4–20mA transmitters across galvanically isolated barriers. IC Role / Device Role / Timing Role: Isolated-side ADC converting conditioned current-loop voltages with precise ratiometric referencing to local LDO output. Use Value: VREF = VCC eliminates reference drift errors; ±8 LSB INL ensures repeatability across 10,000-cycle calibration intervals. |
| Battery-Operated Sensor Node | Ratiometric Pressure Sensing |
|
Use Scenario: Wireless environmental monitor logging temperature, humidity, and barometric pressure using MEMS sensors. IC Role / Device Role / Timing Role: Low-power ADC sampling bridge-based sensors at 10sps, entering shutdown between readings. Use Value: Auto-shutdown cuts average current to 1.2µA at 10sps - extends CR2032 battery life to 3+ years with BLE transmission every 5 minutes. |
Use Scenario: Automotive manifold absolute pressure (MAP) sensor interfacing to engine control unit. IC Role / Device Role / Timing Role: Ratiometric ADC measuring bridge output referenced to same supply as pressure sensor excitation. Use Value: Immunity to supply rail variation (±10%) preserves accuracy; 82dB SNR resolves <0.1kPa pressure steps in 100kPa full-scale range. |
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 | Same silicon, commercial temp range (0°C to 70°C); identical pinout, timing, and electrical specs. | Not rated for extended industrial environments; unsuitable for under-hood or factory-floor deployments. | Select LTC1865LCS8 only for cost-sensitive consumer-grade products where ambient temperature remains within 0–70°C. |
| ADS8325IDR | TI 16-bit 100ksps SAR ADC; SPI interface, but requires external reference and has higher 1.2mA supply current. | Lacks auto-shutdown and integrated MUX; needs external op-amp buffering for high-Z sensors. | Choose ADS8325IDR only if existing TI ecosystem mandates compatibility or if higher throughput (>150ksps) is required in future revisions. |
Compared with LTC1865LCS8, the LTC1865LAIS8#PBF provides guaranteed operation down to –40°C - critical for outdoor or automotive cold-soak testing - while matching all electrical performance. Against ADS8325IDR, it delivers 3.7× lower active current and eliminates two external components (reference + buffer), reducing BOM count and PCB area.
Availability
LTC1865LAIS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, isolated data acquisition, and battery-operated sensor nodes requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC1865LAIS8#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 acquired Linear Technology in 2017 and maintains full product support, datasheet archives, and application engineering for legacy Linear parts including the LTC1865LAIS8#PBF.
The LTC1865L belongs to Linear's ultra-low-power precision ADC family, designed specifically for space-constrained, battery-dependent systems where resolution, power efficiency, and ease of integration outweigh raw speed requirements.
FAQ
What is the maximum sampling frequency of the LTC1865LAIS8#PBF?
The LTC1865LAIS8#PBF supports a maximum sampling frequency of 150ksps across its full operating temperature range (–40°C to +85°C). This is a hard limit defined by internal timing constraints - exceeding 150ksps will cause conversion failures or invalid data. The part achieves this rate with only 450µA supply current, making it among the most energy-efficient 16-bit ADCs available in SO-8 packaging.
Does the LTC1865LAIS8#PBF require an external voltage reference?
No - the LTC1865LAIS8#PBF in SO-8 package (including this variant) ties VREF internally to VCC, eliminating the need for an external reference. This simplifies design and reduces cost, though it means full-scale range tracks supply voltage. For ratiometric applications where sensor excitation and ADC reference share the same rail, this architecture improves accuracy and stability.
How does the MUX selection work on the LTC1865LAIS8#PBF?
The LTC1865LAIS8#PBF uses a 2-bit configuration word shifted into SDI during the CONV low period to select between four input modes: single-ended CH0, single-ended CH1, differential CH0–CH1, or differential CH1–CH0. Each conversion cycle begins with fresh configuration, enabling dynamic channel switching without reinitializing the device or altering hardware connections.
What is the purpose of the CONV pin on the LTC1865LAIS8#PBF?
The CONV pin on the LTC1865LAIS8#PBF serves dual functions: a rising edge initiates conversion, and holding it high after conversion completes places the device in auto-shutdown mode (10µA sleep current). When pulled low, it enables SDO output and permits SDI configuration bit loading - making it both a trigger and a functional mode selector.
Can the LTC1865LAIS8#PBF operate from a 2.5V supply?
Yes - the LTC1865LAIS8#PBF operates from 2.7V to 3.6V per Absolute Maximum Ratings, so 2.5V is below the minimum recommended supply. At 2.5V, performance degrades: INL increases beyond ±8 LSB, SNR drops below 82dB, and conversion time may exceed specification. For reliable operation, maintain VCC ≥ 2.7V; consider LTC1865LIMS8 if lower-voltage operation is mandatory.
LTC1865LAIS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1865LAIS8#PBF FAQ
1.How can I place an order for LTC1865LAIS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1865LAIS8#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 LTC1865LAIS8#PBF reliable?
The price and inventory of LTC1865LAIS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1865LAIS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1865LAIS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1865LAIS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1865LAIS8#PBF?
LTC1865LAIS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1865LAIS8#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 LTC1865LAIS8#PBF?
For technical support, including LTC1865LAIS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1865LAIS8#PBF requirements.
6.How does Aetrix verify that LTC1865LAIS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1865LAIS8#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 LTC1865LAIS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1865LAIS8#PBF?
All LTC1865LAIS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1865LAIS8#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 LTC1865LAIS8#PBF part is unused and in its original packaging.
Return procedure for LTC1865LAIS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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