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Analog Devices Inc. LTC1865IS8#TRPBF
- Part No.:
- LTC1865IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1865IS8#TRPBF.pdf
- Description:
- IC ADC 16BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,042
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Product details
Overview
LTC1865IS8#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit, 250ksps successive approximation ADC with software-selectable 2-channel multiplexer, single 5V supply operation, and SPI/MICROWIRE-compatible serial interface in an 8-lead SO package. It features true differential input capability per channel, adjustable reference input, and auto shutdown reducing supply current to 2μA at 1ksps - ideal for low-power, high-precision data acquisition in portable instrumentation.
For engineers reviewing the LTC1865IS8#TRPBF datasheet, LTC1865IS8#TRPBF pinout, LTC1865IS8#TRPBF application, or LTC1865IS8#TRPBF equivalent, key selection criteria include its guaranteed –40°C to +85°C operating range, 87dB SNR at 10kHz, ±2mV offset error (SO-8), 2.75μs conversion time, and compatibility with ratiometric or external reference configurations.
Technical Context
The LTC1865IS8#TRPBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, supporting both single-ended and differential analog input modes via a 2-bit configuration word shifted into SDI. Its internal MUX enables channel selection between CH0 and CH1, each configurable as either pseudo-differential or fully differential relative to GND.
In the SO-8 variant, VREF is internally tied to VCC, fixing full-scale span to VCC (5V), while analog inputs accept 0V to VCC common-mode range and support reduced spans down to 1V full scale when used with external references in MSOP variants - though this SO-8 version does not support external VREF adjustment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 1 part in 65,536 quantization granularity for high-fidelity signal digitization. |
| Max Sampling Rate | 250ksps - supports real-time capture of signals up to ~125kHz bandwidth (Nyquist-limited). |
| Supply Current | 850μA typical at 250ksps - enables battery-powered operation with minimal thermal load. |
| SNR | 87dB at 10kHz input - ensures >14 effective bits of dynamic resolution in mid-band applications. |
| INL Error | ±8 LSB max - guarantees monotonicity and linearity critical for closed-loop control feedback. |
| Conversion Time | 2.75μs typical - defines minimum inter-conversion interval and system throughput latency. |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded systems without derating. |
Pinout & Package
Package: 8-lead plastic SO (Small Outline). RoHS-compliant, lead-free finish, tape-and-reel packaging (TRPBF suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONV (Pin 1) | Convert Control Input | Active-high trigger initiating conversion; held high after completion forces auto-shutdown mode. |
| CH0 (Pin 2) | Analog Input Channel 0 | Positive input for CH0 in differential mode or single-ended input referenced to GND. |
| CH1 (Pin 3) | Analog Input Channel 1 | Positive input for CH1 in differential mode or second single-ended input referenced to GND. |
| GND (Pin 4) | Analog Ground Reference | Common return for analog circuitry; must connect directly to low-impedance analog ground plane. |
| SDI (Pin 5) | Serial Data Input | Receives 2-bit MUX configuration word on rising SCK edges prior to conversion start. |
| SDO (Pin 6) | Serial Data Output | Transmits 16-bit conversion result LSB-first on falling SCK edges during CONV low. |
| SCK (Pin 7) | Serial Clock Input | Synchronizes full-duplex data transfer; maximum frequency 20MHz (H-grade) or 16.7MHz (standard). |
| VCC (Pin 8) | Positive Supply | Single 4.75V–5.25V supply powering analog and digital sections; requires local 1μF bypass to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Software-Selectable 2-Channel MUX | Enables flexible signal routing between CH0/CH1 without external hardware switches or reconfiguration. |
| Auto Shutdown Between Conversions | Reduces ICC from 850μA to 2μA at 1ksps, extending battery life in intermittent-sampling applications. |
| True Differential Input Architecture | Rejects common-mode noise on paired inputs, improving measurement integrity in noisy industrial environments. |
| SPI/MICROWIRE-Compatible Interface | Ensures drop-in compatibility with standard microcontroller SPI peripherals without protocol translation logic. |
| Rail-to-Rail Input Span Support | Accepts 0V to VCC analog input range when VREF = VCC, eliminating need for level-shifting amplifiers. |
Applications
| Portable Instrumentation | Industrial Sensor Interface |
|---|---|
Use Scenario: Handheld multimeter or environmental sensor node acquiring voltage, temperature, or pressure readings. IC Role / Device Role / Timing Role: Primary analog front-end digitizer converting conditioned sensor outputs into 16-bit digital words for MCU processing. Use Value: 250ksps sampling and 87dB SNR enable accurate capture of transient events and low-noise DC measurements within tight power budgets. | Use Scenario: PLC analog input module monitoring multiple field transmitters (4–20mA, thermocouples) in factory automation. IC Role / Device Role / Timing Role: Dual-channel ADC providing isolated, synchronized sampling of two process variables per device. Use Value: Software-configurable MUX allows dynamic channel assignment, reducing component count versus fixed-input alternatives. |
| Remote Data Acquisition | Isolated Signal Monitoring |
Use Scenario: Wireless telemetry unit collecting vibration or acoustic data from rotating machinery in inaccessible locations. IC Role / Device Role / Timing Role: Low-power ADC interfacing with MEMS accelerometers or piezoelectric sensors before RF transmission. Use Value: 2μA sleep current and 850μA active current allow multi-year battery life in duty-cycled deployments. | Use Scenario: Medical patient monitor measuring biopotentials (ECG, EEG) requiring galvanic isolation from mains-connected systems. IC Role / Device Role / Timing Role: Isolated-side ADC digitizing analog signals post-isolation barrier, communicating via opto-coupled SPI lines. Use Value: High impedance inputs and differential topology minimize loading effects and reject common-mode interference induced across isolation barriers. |
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 |
|---|---|---|---|
| ADS8684IPW | 4-channel, 16-bit, 500ksps, integrated PGA and reference; SPI interface; 28-pin TSSOP. | Higher channel count and programmable gain simplify multi-sensor systems but require larger PCB area and higher cost. | Select when needing >2 channels or variable gain without external op-amps; not pin-compatible. |
| MAX11100ETE+ | Single-channel, 16-bit, 250ksps, internal reference; SPI interface; 16-pin TQFN. | Lacks MUX and external reference flexibility; optimized for space-constrained single-input designs. | Choose for compact, single-channel applications where VREF integration reduces BOM count. |
Compared with ADS8684IPW and MAX11100ETE+, the LTC1865IS8#TRPBF offers unique 2-channel software-selectable MUX functionality in an industry-standard SO-8 package, enabling dual-input sampling with minimal layout overhead - ideal when channel flexibility and legacy footprint compatibility are prioritized over integrated features.
Availability
LTC1865IS8#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interface, and remote data acquisition requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature range performance.
Supply support for LTC1865IS8#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, serving industrial, automotive, communications, and healthcare markets.
The LTC1865IS8#TRPBF belongs to ADI's legacy Linear Technology precision data acquisition product line, designed specifically for low-power, high-resolution sampling in space- and energy-constrained embedded systems.
FAQ
What is the maximum sampling rate supported by the LTC1865IS8#TRPBF?
The LTC1865IS8#TRPBF supports a maximum sampling rate of 250ksps under standard conditions (VCC = 5V, TA = 25°C). At this rate, conversion time is 2.75μs, and supply current is 850μA typical. The device maintains specified performance across its full –40°C to +85°C operating range, with minor derating in H-grade versions.
Does the LTC1865IS8#TRPBF support external reference voltage?
No - the LTC1865IS8#TRPBF is the SO-8 package variant, where VREF is internally tied to VCC. Full-scale range is therefore fixed at VCC (4.75V–5.25V). External reference operation is only supported in the 10-lead MSOP variants (e.g., LTC1865IMS#TRPBF), which provide a dedicated VREF pin accepting 1V to VCC.
How does the 2-channel MUX operate in the LTC1865IS8#TRPBF?
The LTC1865IS8#TRPBF uses a 2-bit configuration word shifted into SDI during the CONV low period to select between CH0 and CH1. Supported modes include single-ended (CH0–GND or CH1–GND) and differential (CH0–CH1 or CH1–CH0). The MUX is software-controlled per conversion cycle, enabling dynamic channel switching without hardware changes.
What is the purpose of the CONV pin on the LTC1865IS8#TRPBF?
The CONV pin on the LTC1865IS8#TRPBF serves as the master conversion trigger and power management control. A rising edge initiates sampling and conversion; if held high post-conversion, the device enters auto-shutdown mode drawing only leakage current. A falling edge enables SDO output for serial data readout synchronized to SCK.
Is the LTC1865IS8#TRPBF pin-compatible with earlier 12-bit Linear Technology ADCs?
Yes - the LTC1865IS8#TRPBF shares the same 8-lead SO footprint and pinout as the pin-compatible 12-bit LTC1860/LTC1861 family. This allows direct 16-bit resolution upgrades in existing designs without PCB layout changes, provided timing and firmware accommodate the extended 16-bit data word and MUX configuration sequence.
LTC1865IS8#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):
- 250k
- 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:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1865IS8#TRPBF FAQ
1.How can I place an order for LTC1865IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1865IS8#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 LTC1865IS8#TRPBF reliable?
The price and inventory of LTC1865IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1865IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1865IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1865IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1865IS8#TRPBF?
LTC1865IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1865IS8#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 LTC1865IS8#TRPBF?
For technical support, including LTC1865IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1865IS8#TRPBF requirements.
6.How does Aetrix verify that LTC1865IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1865IS8#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 LTC1865IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1865IS8#TRPBF?
All LTC1865IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1865IS8#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 LTC1865IS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1865IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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