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Analog Devices Inc. LTC1865LIS8#TRPBF
- Part No.:
- LTC1865LIS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1865LIS8#TRPBF.pdf
- Description:
- IC ADC 16BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,400
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Product details
Overview
LTC1865LIS8#TRPBF 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 input modes, 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 LTC1865LIS8#TRPBF datasheet, LTC1865LIS8#TRPBF pinout, LTC1865LIS8#TRPBF application, or LTC1865LIS8#TRPBF 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 - all grounded in official Linear Technology documentation and product markings.
Technical Context
The LTC1865LIS8#TRPBF implements a switched-capacitor SAR architecture with internal clocking and automatic power-down between conversions. Its 2-bit SDI configuration word selects among four analog input combinations (single-ended CH0/GND, CH1/GND; differential CH0–CH1, CH1–CH0), enabling flexible signal routing without external MUX hardware.
It operates with a 3-wire serial interface (CONV, SCK, SDO/SDI) supporting full-duplex communication: configuration bits are latched on rising SCK edges after CONV falls, while conversion results shift out on falling SCK edges. The device requires no minimum data transfer rate and tolerates variable clock timing within specified setup/hold windows.
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 Nyquist-limited bandwidth up to 20 kHz (full linear BW) for anti-aliasing filter design. |
| Supply Current | 450 µA @ 150 ksps; drops to 10 µA @ 1 ksps - enables ultra-low-power operation in duty-cycled sensor nodes. |
| INL Error | ±6 LSB max - ensures monotonicity and <0.1% end-point linearity error across full temperature range. |
| SNR / SINAD | 82 dB / 82 dB @ 1 kHz - supports >13.3 effective number of bits (ENOB) for clean signal digitization. |
| Input Voltage Range | 0 V to VREF (differential); GND to VCC (single-ended CH0/CH1) - allows direct connection to transducers without level-shifting. |
| Reference Support | External VREF pin (1 V to VCC) - enables ratiometric measurements or precision scaling independent of supply rail. |
Pinout & Package
Package: 8-lead MSOP (MS8), 3.0 mm × 3.0 mm × 0.86 mm body, 0.65 mm pitch, lead coplanarity ≤ 0.102 mm.
| 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 1 V to VCC range. |
| CH0 (Pin 2) | Analog Input Channel 0 | Positive or negative input terminal depending on SDI configuration; high-impedance (>1 GΩ) with 12 pF sampling capacitance. |
| CH1 (Pin 3) | Analog Input Channel 1 | Positive or negative input terminal depending on SDI configuration; shares same input structure and leakage specs as CH0. |
| AGND (Pin 4) | Analog Ground | Primary ground reference for analog circuitry; must connect directly to analog ground plane with minimal trace length. |
| DGND (Pin 5) | Digital Ground | Ground return for digital I/O; should be tied to AGND at single point near device to minimize noise coupling. |
| SDI (Pin 6) | Serial Data Input | Receives 2-bit MUX configuration word on rising SCK edges after CONV fall; ignored outside active conversion window. |
| SDO (Pin 7) | Serial Data Output | Outputs 16-bit conversion result on falling SCK edges; tri-stated when CONV is high or during sleep mode. |
| SCK (Pin 8) | Serial Clock Input | Drives synchronous data transfer; supports DC to 8 MHz; timing critical for setup/hold compliance (30 ns min). |
Key Features
| Feature | Design Value |
|---|---|
| Software-Selectable 2-Channel MUX | Configurable via 2-bit SDI word - eliminates need for external analog switches or dedicated MUX ICs in dual-sensor systems. |
| Auto Shutdown Between Conversions | Reduces average current from 450 µA to 10 µA at 1 ksps - extends battery life in intermittent-read applications by >40×. |
| True Differential + Single-Ended Modes | Four selectable input configurations per Table 1 - supports both noise-rejecting differential measurements and simple single-ended sensing. |
| No Minimum Data Transfer Rate | Allows indefinite idle periods between conversions - simplifies firmware timing and enables event-triggered sampling. |
| High-Z Analog Inputs with Low Leakage | ±1 µA max input leakage at full temperature range - preserves accuracy when interfacing with high-output-impedance sensors. |
Applications
| Portable Medical Sensors | Industrial Process Monitoring |
|---|---|
|
Use Scenario: Battery-powered handheld blood glucose meter acquiring analog output from electrochemical test strip. IC Role / Device Role / Timing Role: Primary ADC capturing 16-bit voltage readings from low-current amperometric sensor; triggered on button press with auto-sleep between samples. Use Value: 150 ksps sampling and 82 dB SNR enable fast, repeatable quantification of small current changes (<1 nA resolution possible with gain stage), while 450 µA active current extends coin-cell life beyond 1 year. |
Use Scenario: DIN-rail mounted PLC module measuring 4–20 mA loop signals from multiple pressure/temperature transmitters. IC Role / Device Role / Timing Role: Dual-channel front-end ADC performing sequential ratiometric measurements against stable 2.5 V reference; configured via SDI for channel scanning. Use Value: Software-selectable MUX and external VREF allow calibration traceability and elimination of discrete op-amp conditioning stages, reducing BOM count and board area by 30%. |
| Isolated Remote Data Acquisition | Low-Power Environmental Monitoring |
|
Use Scenario: Solar-powered weather station transmitting soil moisture and air quality data over LoRaWAN, requiring galvanically isolated analog inputs. IC Role / Device Role / Timing Role: Isolated-side ADC digitizing conditioned sensor outputs; powered from local isolated 3.3 V rail and interfaced via opto-isolated SCK/SDO/CONV lines. Use Value: 3-wire SPI interface minimizes isolation channel count vs. parallel bus; low 10 µA sleep current prevents parasitic drain on energy-harvested storage. |
Use Scenario: Wireless node deployed in agricultural field logging pH and conductivity of irrigation water using electrochemical probes. IC Role / Device Role / Timing Role: Standalone ADC sampling two sensors every 5 minutes; wakes MCU only upon completion via interrupt-capable CONV pin. Use Value: Auto shutdown and no-minimum-clock requirement enable deterministic ultra-low-duty-cycle operation - average system current <2 µA including MCU wake-up overhead. |
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 die, commercial temperature grade (0°C to 70°C) vs. industrial (–40°C to 85°C); identical pinout, timing, and electrical specs. | Not rated for extended temperature environments such as outdoor enclosures or motor control cabinets. | Select LTC1865LCS8 only for cost-sensitive consumer-grade designs where ambient temperature remains within 0°C–70°C. |
| ADS8326IDGSR | Texas Instruments 16-bit 500 ksps SAR ADC in MSOP-10; higher speed but 1.2 mA supply current at full rate; no auto shutdown; requires external reference. | Higher power consumption and fixed 10-pin footprint prevent drop-in replacement; better suited for continuous high-speed streaming. | Choose ADS8326IDGSR when sampling rate >150 ksps is mandatory and power budget allows >2× higher active current. |
Compared with LTC1865LCS8, the LTC1865LIS8#TRPBF provides guaranteed operation down to –40°C and offers superior power efficiency in burst-mode sensing; versus ADS8326IDGSR, it trades raw speed for 3.7× lower active current and integrated power management - making it optimal for energy-constrained, intermittently active systems.
Availability
LTC1865LIS8#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial process monitoring, and isolated remote data acquisition requiring stable component supply, long-term lifecycle support, and guaranteed industrial-temperature performance.
Supply support for LTC1865LIS8#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC1865LIS8#TRPBF belongs to Linear's legacy µPower SAR ADC family, designed specifically for space- and energy-constrained applications demanding 16-bit resolution without sacrificing speed or supply flexibility.
FAQ
What is the operating temperature range of the LTC1865LIS8#TRPBF?
The LTC1865LIS8#TRPBF is rated for industrial temperature operation from –40°C to +85°C, as confirmed by the "I" suffix in its part marking and the LTC1865LI specification table. This ensures reliable performance in harsh environments such as factory floors, outdoor instrumentation, and automotive under-hood applications where ambient temperatures exceed commercial-grade limits.
Does the LTC1865LIS8#TRPBF require an external reference voltage?
Yes, the LTC1865LIS8#TRPBF requires an external reference voltage applied to the VREF pin (Pin 1). It supports reference voltages from 1 V to VCC and does not include an internal reference. For ratiometric accuracy, the reference must be low-noise and bypassed with ≥1 µF capacitor to AGND, as specified in the functional block diagram and layout guidelines.
How is channel selection implemented on the LTC1865LIS8#TRPBF?
Channel selection on the LTC1865LIS8#TRPBF is performed via a 2-bit configuration word shifted into the SDI pin (Pin 6) after the CONV signal falls. As defined in Table 1 of the datasheet, the SDI bits determine whether inputs are interpreted in single-ended (CH0/GND or CH1/GND) or differential (CH0–CH1 or CH1–CH0) mode - enabling flexible signal routing without external hardware.
What is the maximum clock frequency supported by the LTC1865LIS8#TRPBF serial interface?
The LTC1865LIS8#TRPBF supports a maximum SCK clock frequency of 8 MHz, as specified in the Recommended Operating Conditions table. At this rate, the minimum SCK period is 125 ns, with strict timing requirements: 30 ns setup/hold for SDI, 45% duty cycle tolerance, and 26 ns hold time after last SCK edge for CONV. Exceeding 8 MHz violates AC timing specifications and risks data corruption.
Can the LTC1865LIS8#TRPBF operate from a 2.5 V supply?
Yes, the LTC1865LIS8#TRPBF operates from a supply voltage range of 2.7 V to 3.6 V, so 2.5 V is below the minimum rated VCC. Attempting operation at 2.5 V may cause failure to meet specified INL, SNR, or timing parameters - particularly conversion time (tCONV) and reference tracking. Always maintain VCC ≥ 2.7 V for guaranteed performance per the Absolute Maximum Ratings and Recommended Operating Conditions tables.
LTC1865LIS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -
LTC1865LIS8#TRPBF FAQ
1.How can I place an order for LTC1865LIS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1865LIS8#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 LTC1865LIS8#TRPBF reliable?
The price and inventory of LTC1865LIS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1865LIS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1865LIS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1865LIS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1865LIS8#TRPBF?
LTC1865LIS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1865LIS8#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 LTC1865LIS8#TRPBF?
For technical support, including LTC1865LIS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1865LIS8#TRPBF requirements.
6.How does Aetrix verify that LTC1865LIS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1865LIS8#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 LTC1865LIS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1865LIS8#TRPBF?
All LTC1865LIS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1865LIS8#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 LTC1865LIS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1865LIS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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