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Analog Devices Inc. LTC1865AIS8#PBF
- Part No.:
- LTC1865AIS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1865AIS8#PBF.pdf
- Description:
- IC ADC 16BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:118
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Product details
Overview
LTC1865AIS8#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 250ksps successive approximation ADC in an 8-lead SOIC package, operating from a single 5V supply. It features software-selectable 2-channel multiplexing, adjustable reference input, and auto-shutdown that reduces supply current to 2μA at 1ksps. It is used in isolated data acquisition systems where low power, high resolution, and compact size are critical.
For engineers reviewing the LTC1865AIS8#PBF datasheet, LTC1865AIS8#PBF pinout, LTC1865AIS8#PBF application, or LTC1865AIS8#PBF equivalent, this page delivers verified specifications, SO-8 pin mapping, real-world use cases in battery-powered instrumentation and remote sensing, and validated alternative parts with documented functional and packaging differences.
Technical Context
The LTC1865AIS8#PBF implements a switched-capacitor SAR architecture with integrated sample-and-hold and a 2-channel analog MUX controlled via serial SDI configuration word. Its SO-8 variant fixes VREF internally to VCC, yielding a rail-to-rail input span of 0V to VCC without external reference components.
It uses a 3-wire SPI/MICROWIRE-compatible serial interface with full-duplex operation: SDI accepts channel selection bits on CONV↓, while SDO outputs 16-bit conversion results synchronized to SCK falling edges. Conversion time is guaranteed at ≤3.3μs across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 1 LSB = 76.3 μV at 5V full scale for precise sensor digitization |
| Max Sampling Rate | 250 ksps - supports real-time capture of signals up to 125 kHz bandwidth (Nyquist) |
| Supply Current | 850 μA typical at 250 ksps; drops to 2 μA at 1 ksps - enables multi-year battery life in portable instruments |
| INL Error | ±6.5 LSB max - ensures monotonicity and <0.1% end-point linearity error over temperature |
| SNR | 87 dB - supports >14 ENOB for clean measurement of low-amplitude signals in noisy environments |
| Input Span | 0V to VCC (5V) - eliminates need for external reference or level-shifting circuitry in SO-8 configuration |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive under-hood data logging applications |
Pinout & Package
Package: 8-lead plastic SOIC (SO-8), surface-mount, JEDEC MS-012AC compliant. Thermal resistance θJA = 175°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CONV | Active-high conversion trigger; falling edge enables SDO output and initiates serial readout |
| 2 | CH0 | Analog input channel 0; referenced to GND in single-ended mode or paired with CH1 in differential mode |
| 3 | CH1 | Analog input channel 1; used as inverting input when CH0 is selected as "+" in differential MUX mode |
| 4 | GND | Analog ground reference plane connection; must be tied directly to low-impedance analog ground |
| 5 | SDI | Serial data input; accepts 2-bit MUX configuration word on first two SCK rising edges after CONV↓ |
| 6 | SDO | Serial data output; drives 16-bit conversion result MSB-first on SCK falling edges |
| 7 | SCK | Serial clock input; synchronizes both SDI write and SDO read operations; max 20 MHz (H-grade) |
| 8 | VCC | Positive supply (4.75V–5.25V); internally connects to VREF in SO-8 package, defining full-scale range |
Key Features
| Feature | Design Value |
|---|---|
| Software-selectable 2-channel MUX | Enables dual-sensor monitoring (e.g., temperature + pressure) without external analog switches or layout changes |
| Auto shutdown between conversions | Reduces average current by >99% at low sampling rates, extending battery runtime in intermittent-sense applications |
| True rail-to-rail input (0V to VCC) | Accepts unbuffered sensor outputs directly-no op-amp gain stage required for 0–5V transducers |
| Guaranteed 16-bit no-missing-codes | Ensures monotonic response across full temperature range, critical for closed-loop control feedback paths |
| SPI/MICROWIRE™-compatible interface | Integrates seamlessly with common microcontrollers (e.g., STM32, MSP430) without protocol translation logic |
Applications
| Industrial Process Monitoring | Portable Environmental Sensors |
|---|---|
|
Use Scenario: Continuous logging of thermocouple and RTD outputs in factory-floor PLC I/O modules. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing two independent analog sensors per conversion cycle with 16-bit precision. Use Value: Eliminates external MUX and reference ICs, reducing BOM count and PCB area while maintaining ±0.1°C measurement accuracy. |
Use Scenario: Battery-powered air quality monitor measuring PM2.5, CO₂, and humidity with 6-month operational life. IC Role / Device Role / Timing Role: Low-power ADC acquiring sensor data at 100 Hz with automatic sleep between samples. Use Value: 2 μA sleep current extends coin-cell battery life beyond 200 days; SO-8 footprint simplifies compact enclosure design. |
| Isolated Remote Data Acquisition | Medical Vital Sign Front-End |
|
Use Scenario: DIN-rail mounted sensor node transmitting vibration and temperature data over RS-485 to central SCADA. IC Role / Device Role / Timing Role: High-SNR ADC interfacing with isolation amplifiers and driving isolated UART via microcontroller. Use Value: 87 dB SNR preserves signal integrity across galvanic isolation barrier; 250 ksps supports FFT-based bearing fault detection. |
Use Scenario: Wearable ECG patch digitizing lead-I and lead-II differential signals with motion artifact rejection. IC Role / Device Role / Timing Role: Dual-input SAR ADC configured for simultaneous sampling of two biopotential channels. Use Value: True differential input pair rejects common-mode noise from body coupling; 16-bit resolution resolves sub-μV cardiac waveforms. |
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, 500 ksps; internal reference; SPI interface; 20-pin TSSOP | Higher channel count and speed, but larger footprint and 3.3V-only supply | Select when system requires ≥4 simultaneous inputs and 3.3V domain compatibility |
| MAX11105ETE+ | 8-channel, 16-bit, 250 ksps; internal reference; SPI; 16-pin TQFN; 2.7–3.6V supply | Wider channel density and lower voltage operation, but incompatible 3.3V supply and smaller thermal pad | Select for space-constrained, low-voltage battery systems needing >2 channels |
Compared with LTC1865AIS8#PBF, ADS8684IPW offers double the throughput and integrated reference but demands PCB redesign for 20-pin TSSOP and 3.3V rails; MAX11105ETE+ provides 4× channel density in a smaller package but cannot operate from 5V, limiting direct drop-in replacement in legacy 5V sensor interfaces.
Availability
LTC1865AIS8#PBF is available at Aetrix Electronics and suitable for industrial process monitoring, portable environmental sensors, and isolated remote data acquisition requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for LTC1865AIS8#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1865AIS8#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, engineered for low-power, high-resolution measurement in space- and energy-constrained embedded systems.
FAQ
What is the maximum sampling rate of the LTC1865AIS8#PBF?
The LTC1865AIS8#PBF achieves a maximum sampling rate of 250 ksps at full 16-bit resolution. This is guaranteed across its specified operating temperature range (–40°C to +85°C) and supports analog input bandwidths up to 125 kHz per Nyquist criterion. The device maintains this rate with typical supply current of only 850 μA, making it suitable for high-speed, low-power data logging applications.
Does the LTC1865AIS8#PBF require an external reference voltage?
No - the LTC1865AIS8#PBF in the SO-8 package (including LTC1865AIS8#PBF) internally ties VREF to VCC, establishing a fixed 0V to VCC input span. This eliminates the need for external reference components, simplifying design and reducing cost. External references are only supported in the MSOP variants (e.g., LTC1865AIMS#PBF), not in the SO-8 form factor.
How does the 2-channel MUX work on the LTC1865AIS8#PBF?
The LTC1865AIS8#PBF uses a 2-bit configuration word shifted into SDI during the first two SCK cycles after CONV↓ to select among four input modes: CH0 single-ended, CH1 single-ended, CH0–CH1 differential, or CH1–CH0 differential. This software-controlled MUX allows flexible sensor pairing without hardware reconfiguration, and all selections maintain 16-bit resolution and guaranteed no-missing-codes performance.
What is the supply voltage range for the LTC1865AIS8#PBF?
The LTC1865AIS8#PBF operates from a single supply voltage of 4.75V to 5.25V. Operation outside this range violates Absolute Maximum Ratings and may cause permanent damage. The SO-8 package's internal VREF tie to VCC means the analog input full-scale range tracks supply voltage - a 5.0V ±5% tolerance yields corresponding 0–5.25V input span, requiring stable regulation for measurement accuracy.
Is the LTC1865AIS8#PBF pin-compatible with earlier 12-bit versions?
No - the LTC1865AIS8#PBF is not pin-compatible with 12-bit predecessors like the LTC1860/LTC1861. While both use SO-8 packages, the LTC1865AIS8#PBF repurposes Pin 5 as SDI (digital input) instead of IN– (analog input), and Pin 2/3 serve as CH0/CH1 rather than differential IN+/IN–. Board-level replacement requires schematic and layout revision to accommodate the MUX control interface and revised analog routing.
LTC1865AIS8#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):
- 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:
- -
LTC1865AIS8#PBF FAQ
1.How can I place an order for LTC1865AIS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1865AIS8#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 LTC1865AIS8#PBF reliable?
The price and inventory of LTC1865AIS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1865AIS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1865AIS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1865AIS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1865AIS8#PBF?
LTC1865AIS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1865AIS8#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 LTC1865AIS8#PBF?
For technical support, including LTC1865AIS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1865AIS8#PBF requirements.
6.How does Aetrix verify that LTC1865AIS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1865AIS8#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 LTC1865AIS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1865AIS8#PBF?
All LTC1865AIS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1865AIS8#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 LTC1865AIS8#PBF part is unused and in its original packaging.
Return procedure for LTC1865AIS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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