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Analog Devices Inc. LTC1865AIS8#TRPBF
- Part No.:
- LTC1865AIS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1865AIS8#TRPBF.pdf
- Description:
- IC ADC 16BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,218
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Product details
Overview
LTC1865AIS8#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit, 250ksps successive approximation ADC with software-selectable dual-channel multiplexer, operating on a single 5V supply in an 8-lead SOIC package. It features true differential input capability per channel, adjustable reference input, auto shutdown reducing supply current to 2μA at 1ksps, and SPI/MICROWIRE-compatible serial interface. It is designed for low-power, high-precision data acquisition in battery-operated instrumentation.
For engineers reviewing the LTC1865AIS8#TRPBF datasheet, LTC1865AIS8#TRPBF pinout, LTC1865AIS8#TRPBF application, or LTC1865AIS8#TRPBF equivalent, this page delivers verified specifications, validated pin functions, real-world use cases, and actionable alternative part guidance - all grounded in official Linear Technology documentation and confirmed package-level behavior of the SO-8 variant.
Technical Context
The LTC1865AIS8#TRPBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, supporting both single-ended and differential input configurations via a 2-bit SDI control word. Its reference input is internally tied to VCC in the SO-8 package, fixing full-scale range to VCC (4.75V–5.25V), unlike the MSOP version which supports external reference down to 1V.
It uses a 3-wire serial interface (SCK, SDO, SDI) with full-duplex operation: configuration bits are clocked in on SDI during CONV low, while conversion results shift out on SDO synchronized to the same SCK. Conversion time is guaranteed ≤3.3μs, enabling maximum sampling at 250ksps with typical supply current of 850μA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 discrete output codes for high dynamic range measurement. |
| Max Sampling Rate | 250ksps - supports real-time capture of signals up to 125kHz full-linear bandwidth. |
| Supply Current | 850μA typ at 250ksps; drops to 2μA at 1ksps - enables ultra-low-power operation in sleep-aware systems. |
| INL Error | ±6 LSB max (A-grade) - ensures monotonicity and accuracy over full temperature range (–40°C to +85°C). |
| Signal-to-Noise Ratio | 87 dB - supports >14-bit effective resolution in noise-sensitive analog front-ends. |
| Reference Input | Internally tied to VCC in SO-8 package - eliminates external reference component but fixes full-scale to supply voltage. |
| Digital Interface | SPI/MICROWIRE-compatible 3-wire serial - simplifies host MCU integration without additional protocol translation. |
Pinout & Package
Package: 8-lead plastic SOIC (SO-8), surface-mount, JEDEC MS-012AC compliant, with θJA = 175°C/W and rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONV (Pin 1) | Convert Control Input | Rising edge initiates conversion; held high after completion enters auto-shutdown mode; falling edge enables SDO output. |
| 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 single-ended input referenced to GND. |
| GND (Pin 4) | Analog Ground | Common return for analog circuitry; must be tied directly to low-impedance analog ground plane. |
| SDI (Pin 5) | Serial Data Input | Receives 2-bit MUX configuration word (SGL/DIFF, ODD/SIGN) during CONV low for next conversion. |
| SDO (Pin 6) | Serial Data Output | Outputs 16-bit conversion result MSB-first on falling SCK edges; tri-stated when CONV high. |
| SCK (Pin 7) | Serial Clock Input | Drives synchronous full-duplex data transfer; supports up to 20MHz clock frequency (H-grade). |
| VCC (Pin 8) | Positive Supply | Single 4.75V–5.25V supply; powers analog and digital sections; internally connects to VREF in SO-8 package. |
Key Features
| Feature | Design Value |
|---|---|
| Software-selectable 2-channel MUX | Enables flexible signal routing (single-ended or differential) without external switches or reconfiguration hardware. |
| Auto shutdown between conversions | Reduces average power by >99% at low sampling rates - critical for battery life in portable instruments. |
| True differential input per channel | Rejects common-mode noise on CH0/CH1 pairs, improving SNR in electrically noisy industrial environments. |
| Guaranteed operation to +85°C | Validated performance across –40°C to +85°C ambient - suitable for industrial and automotive under-hood applications. |
| No missing codes over full range | Ensures monotonic response and reliable zero-crossing detection in closed-loop control feedback paths. |
Applications
| Portable Data Loggers | Industrial Sensor Interfaces |
|---|---|
|
Use Scenario: Battery-powered environmental monitoring units measuring temperature, pressure, and humidity over extended field deployments. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned sensor outputs with minimal power overhead and configurable input scaling. Use Value: 850μA typical supply current at 250ksps and auto-shutdown at idle extend battery life beyond 12 months on two AA cells. |
Use Scenario: PLC analog input modules acquiring signals from 4–20mA transmitters, RTDs, and strain gauges in factory automation. IC Role / Device Role / Timing Role: High-accuracy front-end converter supporting multiple sensor types via software-configurable MUX and differential inputs. Use Value: ±6 LSB INL and 87 dB SNR enable 16-bit precision across temperature ranges without calibration drift compensation. |
| Isolated Remote I/O Systems | Low-Power Medical Instrumentation |
|
Use Scenario: DIN-rail mounted isolated data acquisition nodes transmitting sensor data over RS-485 or CAN bus. IC Role / Device Role / Timing Role: Isolated-side ADC interfacing with optocoupled or digital isolator-based serial links. Use Value: SPI-compatible 3-wire interface minimizes isolation channel count; SO-8 footprint simplifies layout in space-constrained isolated PCB regions. |
Use Scenario: Handheld ECG or pulse oximetry devices requiring high-resolution biopotential signal acquisition with strict power budgets. IC Role / Device Role / Timing Role: Low-noise, low-power ADC capturing amplified bio-signals while maintaining patient safety isolation boundaries. Use Value: Differential input structure rejects 50/60Hz mains interference; 2μA sleep current preserves charge between intermittent measurements. |
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 |
|---|---|---|---|
| ADS8325IPW | 16-bit, 100ksps, SPI interface, internal reference; no MUX; SO-16 package. | Lacks dual-channel software MUX; lower speed; requires external reference for full-scale flexibility. | Choose when fixed single-channel acquisition suffices and board space allows larger SO-16 footprint. |
| MAX11206ETE+ | 16-bit, 10ksps delta-sigma ADC; internal oscillator; 2.7–3.6V supply; TQFN-16. | Delta-sigma architecture offers higher resolution at low speeds but cannot match 250ksps throughput or 5V compatibility. | Prefer for ultra-low-noise DC measurements where speed is secondary and supply voltage is <4V. |
Compared with ADS8325IPW and MAX11206ETE+, the LTC1865AIS8#TRPBF uniquely combines 250ksps sampling, dual-channel software MUX, 5V single-supply operation, and SO-8 compactness - making it optimal for cost- and space-constrained high-speed industrial data loggers.
Availability
LTC1865AIS8#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and isolated remote I/O systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1865AIS8#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. (including legacy Linear Technology products) designs high-performance analog, mixed-signal, and digital signal processing ICs for precision measurement, power management, and signal conditioning.
The LTC1865 belongs to Linear's precision SAR ADC product line, engineered for low-power, high-speed data acquisition in battery-operated and thermally constrained environments - emphasizing accuracy, small footprint, and supply simplicity.
FAQ
What is the reference voltage configuration for LTC1865AIS8#TRPBF?
The LTC1865AIS8#TRPBF uses an SO-8 package variant where the VREF pin is internally tied to VCC. This means its full-scale input range is fixed to the supply voltage (4.75V–5.25V), eliminating the need for an external reference but precluding independent reference scaling. This differs from the MSOP version, which accepts external references from 1V to VCC.
Does LTC1865AIS8#TRPBF support true differential input on both channels?
Yes - the LTC1865AIS8#TRPBF supports true differential input per selected channel via its 2-bit MUX control. When configured for differential mode (SGL/DIFF = 0), it measures CH0–CH1 or CH1–GND depending on ODD/SIGN bit, with simultaneous sampling rejecting common-mode noise. This is confirmed in the functional block diagram and Table 1 of the datasheet.
What is the minimum sampling rate supported by LTC1865AIS8#TRPBF?
The LTC1865AIS8#TRPBF has no specified minimum sampling rate. Its auto-shutdown feature reduces supply current to 2μA at 1ksps, and leakage current dominates at lower rates. The device remains fully functional down to DC sampling - verified by the "Sleep Current vs Temperature" graph (Fig G03) and "Supply Current vs Sampling Frequency" curve (Fig G01), which show stable operation from 0.01kHz upward.
Can LTC1865AIS8#TRPBF be used with a 3.3V microcontroller SPI interface?
Yes - the LTC1865AIS8#TRPBF's digital inputs (CONV, SDI, SCK) accept VIH ≥2.4V and VIL ≤0.8V at VCC = 4.75V–5.25V, making them compatible with 3.3V logic levels when driven by standard CMOS outputs. However, SDO output swings from 0V to VCC (5V), so level-shifting is required if connecting to a 3.3V-only MCU input.
Is LTC1865AIS8#TRPBF pin-compatible with earlier LTC1860/LTC1861 series?
No - the LTC1865AIS8#TRPBF is not pin-compatible with the LTC1860/LTC1861 family. While the datasheet notes "pin compatible with 12-bit LTC1860/LTC1861", that applies only to the LTC1864 (1-channel) SO-8 variant, not the LTC1865 (2-channel) SO-8. The LTC1865AIS8#TRPBF uses pins 2–3 for CH0/CH1 and pin 5 for SDI, whereas LTC1860/LTC1861 use pins 2–3 for IN+/IN– and lack SDI functionality entirely.
LTC1865AIS8#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:
- -
LTC1865AIS8#TRPBF FAQ
1.How can I place an order for LTC1865AIS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1865AIS8#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 LTC1865AIS8#TRPBF reliable?
The price and inventory of LTC1865AIS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1865AIS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1865AIS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1865AIS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1865AIS8#TRPBF?
LTC1865AIS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1865AIS8#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 LTC1865AIS8#TRPBF?
For technical support, including LTC1865AIS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1865AIS8#TRPBF requirements.
6.How does Aetrix verify that LTC1865AIS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1865AIS8#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 LTC1865AIS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1865AIS8#TRPBF?
All LTC1865AIS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1865AIS8#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 LTC1865AIS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1865AIS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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