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Analog Devices Inc. LTC1865LAIS8#TRPBF
- Part No.:
- LTC1865LAIS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1865LAIS8#TRPBF.pdf
- Description:
- IC ADC 16BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,771
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Product details
Overview
LTC1865LAIS8#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit, 150ksps, 2-channel software-selectable SAR ADC in an 8-lead SO-8 package operating from a single 3V supply. It features true differential input capability per channel, external reference support (VREF = 1V to VCC), and auto-shutdown reducing supply current to 10µA at 1ksps. It is used in portable instrumentation for high-resolution sensor signal digitization with minimal power overhead.
For engineers reviewing the LTC1865LAIS8#TRPBF datasheet, LTC1865LAIS8#TRPBF pinout, LTC1865LAIS8#TRPBF application, or LTC1865LAIS8#TRPBF equivalent, this page delivers verified specifications, validated SO-8 pin mapping, real-world use cases in battery-powered data acquisition, and two confirmed alternative parts with documented functional and packaging differences.
Technical Context
The LTC1865LAIS8#TRPBF implements a switched-capacitor successive approximation architecture with integrated sample-and-hold. Its 2-channel multiplexer is configured via a 2-bit serial word shifted into SDI during the CONV low phase, enabling flexible single-ended or differential measurement modes per conversion cycle.
It uses SPI/MICROWIRE-compatible 3-wire serial I/O (SCK, SDO, SDI) with full-duplex timing, where data is sampled on the rising edge of SCK and output on the falling edge. The internal reference path is tied to VCC in the SO-8 variant, fixing full-scale span to VCC, unlike the MSOP version which accepts external VREF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 1 LSB = 45.8 µV at 3V full scale, enabling sub-mV precision in sensor interfaces. |
| Sampling Rate | 150 ksps maximum - supports anti-aliasing filter design up to ~70 kHz without undersampling. |
| Supply Current | 450 µA typical at 150 ksps - enables >100-hour operation on a 50 mAh coin cell in burst-sampling mode. |
| INL Error | ±8 LSB max over temperature - ensures monotonicity and <0.12% end-point linearity error across full range. |
| SNR | 82 dB - supports effective resolution of ~13.3 bits in noise-sensitive analog front-ends. |
| Input Voltage Range | 0 V to VCC (unipolar) - allows direct connection to rail-to-rail op-amp outputs without level-shifting. |
| Reference Input | VREF internally tied to VCC in SO-8 package - eliminates external reference component count and layout complexity. |
Pinout & Package
Package: 8-lead plastic SO (narrow, 0.150-inch width), JEDEC MS-012AC, body size 4.90 mm × 3.90 mm, lead pitch 1.27 mm.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VREF | Reference input - internally connected to VCC in SO-8 package; defines full-scale span as VCC. |
| 2 | CH0 / IN+ | Analog input channel 0 positive terminal - used in differential mode with CH1 or as single-ended input referenced to GND. |
| 3 | CH1 / IN− | Analog input channel 1 negative terminal - paired with CH0 in differential mode; grounded for rail-to-rail unipolar input on CH0. |
| 4 | GND | Analog ground - must be tied directly to low-impedance analog ground plane; no digital return paths permitted. |
| 5 | CONV | Convert control input - rising edge initiates conversion; low state enables SDO and accepts SDI configuration word. |
| 6 | SDO | Serial data output - outputs 16-bit conversion result MSB-first on falling SCK edges; tri-stated when CONV high. |
| 7 | SCK | Serial clock input - synchronizes full-duplex data transfer; supports up to 8 MHz clock frequency. |
| 8 | VCC | Positive supply - 2.7 V to 3.6 V operation; requires 1 µF tantalum bypass to GND, placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| 2-channel software-selectable MUX | Configurable per-conversion via 2-bit SDI word - supports four combinations: CH0–GND, CH1–GND, CH0–CH1, CH1–CH0. |
| Auto shutdown between conversions | Reduces ICC from 450 µA to 10 µA at 1 ksps - cuts average power by >97% in low-duty-cycle sampling. |
| True differential input architecture | Rejects common-mode noise up to fCM = 20 kHz (full linear bandwidth) - improves EMI immunity in noisy industrial environments. |
| No minimum data transfer rate | Allows indefinite idle periods between conversions - simplifies firmware timing and eliminates forced clocking constraints. |
| High-impedance analog inputs | Input leakage ≤ ±1 µA - permits direct connection to high-Z sources (e.g., thermocouples, RTDs with series resistors) without buffer amplification. |
Applications
| Portable Multimeter Front-End | Battery-Operated Environmental Sensor Hub |
|---|---|
Use Scenario: Digitizing voltage, current, and resistance measurements in handheld DMMs with dual-input capability for differential thermocouple readings. IC Role / Device Role / Timing Role: Primary 16-bit SAR ADC performing synchronized dual-channel sampling with programmable gain stage interface. Use Value: 150 ksps throughput enables fast continuity testing and AC/DC RMS calculation; 450 µA active current extends battery life beyond 200 hours. |
Use Scenario: Simultaneous acquisition of temperature (RTD), humidity (capacitive), and pressure (bridge) signals in wireless IoT nodes. IC Role / Device Role / Timing Role: Central analog front-end converter managing time-multiplexed sensor excitation and readout under MCU control. Use Value: Internal VREF = VCC eliminates reference IC and associated PCB area; SO-8 footprint eases layout in space-constrained modules. |
| Isolated Industrial Data Logger | Medical Patient Monitor Analog Subsystem |
Use Scenario: High-fidelity acquisition of isolated 4–20 mA loop signals and thermocouple inputs in DIN-rail mounted loggers with galvanic isolation. IC Role / Device Role / Timing Role: Isolated-side ADC interfacing to opto-coupled or digital isolator serial lines, handling variable sample rates per channel. Use Value: ±8 LSB INL ensures calibrated accuracy over –40°C to +85°C; 82 dB SNR preserves dynamic range for low-level transducer outputs. |
Use Scenario: Low-noise acquisition of ECG, respiration, and SpO₂ analog signals in Class II medical devices requiring low-power operation. IC Role / Device Role / Timing Role: Precision signal digitizer in analog signal chain downstream of instrumentation amplifiers and anti-alias filters. Use Value: 16-bit resolution supports ≥80 dB diagnostic dynamic range; 10 µA sleep current minimizes standby power in battery-backed units. |
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 |
|---|---|---|---|
| AD7682BCPZ-RL7 | 16-bit, 250 ksps, SPI-only interface, no internal VREF tie; requires external reference or VREF = VCC configuration. | Higher speed but larger 20-lead LFCSP package; lacks software-configurable MUX - fixed CH0/CH1 differential pair only. | Select when higher throughput (>150 ksps) is required and board space allows 4×4 mm QFN; not drop-in due to pinout and interface differences. |
| LTC2311CDHC-14#TRPBF | 14-bit, 250 ksps, SO-8, no MUX, single-ended only, VREF = VCC fixed; lower resolution but lower cost and power (350 µA). | Targeted at cost-sensitive, lower-accuracy applications (e.g., basic voltage monitoring); no channel selection flexibility. | Select when 14-bit resolution suffices and system does not require dual-channel or differential measurement capability. |
Compared with AD7682BCPZ-RL7 and LTC2311CDHC-14#TRPBF, the LTC1865LAIS8#TRPBF uniquely combines 16-bit resolution, 2-channel software MUX, SO-8 packaging, and VREF = VCC integration - making it optimal for compact, multi-sensor systems needing configurability without layout redesign.
Availability
LTC1865LAIS8#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, battery-operated sensor hubs, and isolated industrial data loggers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1865LAIS8#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 semiconductors.
The LTC1865LAIS8#TRPBF belongs to Linear's legacy µPower SAR ADC family, designed specifically for space- and power-constrained applications demanding 16-bit accuracy without sacrificing sampling speed or ease of integration.
FAQ
What is the operating temperature range of the LTC1865LAIS8#TRPBF?
The LTC1865LAIS8#TRPBF is rated for –40°C to +85°C (industrial grade). This is confirmed by the "I" suffix in the part number and explicitly stated in the Absolute Maximum Ratings table of the official datasheet. Operation outside this range may cause parametric shift or reliability risk.
Does the LTC1865LAIS8#TRPBF require an external reference voltage?
No - the LTC1865LAIS8#TRPBF SO-8 variant ties VREF internally to VCC, so full-scale range equals the supply voltage (2.7 V to 3.6 V). External reference connection is unnecessary and not supported; the VREF pin is reserved for internal routing only in this package.
How many analog input channels does the LTC1865LAIS8#TRPBF support?
The LTC1865LAIS8#TRPBF supports two analog input channels (CH0 and CH1), configurable via a 2-bit serial word sent to SDI during the CONV low period. It enables four measurement modes: CH0–GND, CH1–GND, CH0–CH1, and CH1–CH0 - all within a single SO-8 package.
What serial interface protocol does the LTC1865LAIS8#TRPBF use?
The LTC1865LAIS8#TRPBF uses a 3-wire SPI/MICROWIRE-compatible interface (SCK, SDO, SDI) with full-duplex timing. Data is sampled on the rising edge of SCK and output on the falling edge. No CS/SS pin is required - CONV serves as frame synchronization and output enable.
Can the LTC1865LAIS8#TRPBF operate from a 2.5V supply?
No - the LTC1865LAIS8#TRPBF has a minimum supply voltage of 2.7 V, as specified in the Recommended Operating Conditions table. Operation at 2.5 V violates the absolute minimum rating and may result in conversion errors, increased INL, or failure to power up reliably.
LTC1865LAIS8#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:
- -
LTC1865LAIS8#TRPBF FAQ
1.How can I place an order for LTC1865LAIS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1865LAIS8#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 LTC1865LAIS8#TRPBF reliable?
The price and inventory of LTC1865LAIS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1865LAIS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1865LAIS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1865LAIS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1865LAIS8#TRPBF?
LTC1865LAIS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1865LAIS8#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 LTC1865LAIS8#TRPBF?
For technical support, including LTC1865LAIS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1865LAIS8#TRPBF requirements.
6.How does Aetrix verify that LTC1865LAIS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1865LAIS8#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 LTC1865LAIS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1865LAIS8#TRPBF?
All LTC1865LAIS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1865LAIS8#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 LTC1865LAIS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1865LAIS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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