Analog Devices Inc. LTC1865HMS#TRPBF

Overview

LTC1865HMS#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit, 250ksps, software-selectable 2-channel successive approximation ADC in a 10-lead MSOP package, operating on a single 5V supply with 850μA typical supply current and guaranteed operation to +125°C. It features true differential input MUX, adjustable external reference input (1V to VCC), SPI/MICROWIRE-compatible 3-wire serial interface, and auto shutdown reducing current to 2μA at 1ksps - used in high-precision, low-power data acquisition for industrial sensors and isolated telemetry.

For engineers reviewing the LTC1865HMS#TRPBF datasheet, LTC1865HMS#TRPBF pinout, LTC1865HMS#TRPBF application, or LTC1865HMS#TRPBF equivalent, key selection criteria include its H-grade temperature range (–40°C to +125°C), 10-lead MSOP package, 2-channel MUX configuration, 16-bit resolution with ±8 LSB INL, and compatibility with ratiometric or external reference systems requiring minimal power and board space.

Technical Context

The LTC1865HMS#TRPBF implements a switched-capacitor SAR architecture with integrated sample-and-hold, supporting both single-ended and differential input modes via a 2-bit SDI-configurable MUX. Its conversion timing is fixed at 2.75–3.3 μs (H-grade), enabling deterministic 250ksps sampling with precise CONV-triggered control and full-duplex serial data transfer.

Digital interface compliance includes SPI/MICROWIRE-level timing: SCK up to 16.7 MHz (H-grade), t_suCONV = 60 ns, t_thDO = 5 ns, and SDO output enable/disable delays under 65 ns - ensuring robust synchronization with microcontrollers, FPGAs, or DSPs in noise-sensitive analog front-ends.

Key Specifications

Pinout & Package

10-lead plastic MSOP package (3mm × 3mm, 0.5mm pitch), thermally enhanced with θ_JA = 210°C/W and T_JMAX = 150°C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit SAR ADC applications.

Compared with ADS8860IDRCT and MAX11106ETE+, the LTC1865HMS#TRPBF uniquely combines 250ksps 2-channel sampling, 5V single-supply operation, –40°C to +125°C qualification, and adjustable external reference - making it the only option for ruggedized, dual-sensor industrial systems requiring minimal external components and guaranteed high-temp performance.

Availability

LTC1865HMS#TRPBF is available at Aetrix Electronics and suitable for high-reliability industrial control, automotive ECU subsystems, and isolated telemetry systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC1865HMS#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 LTC1865HMS#TRPBF belongs to ADI's legacy Linear Technology precision data acquisition product line, designed specifically for low-power, high-resolution, multi-channel sensing in space-constrained and thermally demanding environments.

FAQ

What is the maximum sampling frequency of the LTC1865HMS#TRPBF at its highest temperature grade?

The LTC1865HMS#TRPBF achieves a maximum sampling frequency of 250ksps at 25°C and maintains 234ksps minimum across its full –40°C to +125°C operating range, as specified in the H-grade timing characteristics table. This performance is enabled by optimized internal capacitor array settling and guaranteed 16.7MHz SCK tolerance at elevated temperatures.

Does the LTC1865HMS#TRPBF require an external reference voltage, or can it operate with VCC as reference?

The LTC1865HMS#TRPBF requires an external reference voltage applied to the VREF pin and cannot use VCC directly as reference. Unlike the SO-8 version, the MSOP variant (including LTC1865HMS#TRPBF) supports an adjustable reference from 1V to VCC, enabling flexible full-scale spans. VCC must remain within 4.75V–5.25V regardless of VREF setting.

How does the 2-channel MUX in the LTC1865HMS#TRPBF function during conversion?

The LTC1865HMS#TRPBF uses a 2-bit configuration word shifted into SDI before each conversion to select among four input combinations: CH0–CH1 differential, CH0–GND single-ended, CH1–GND single-ended, or CH1–CH0 differential. Both inputs are sampled simultaneously at the CONV rising edge, preserving phase coherence for differential measurements.

What is the purpose of the DGND pin on the LTC1865HMS#TRPBF, and how should it be connected?

The DGND pin on the LTC1865HMS#TRPBF provides a dedicated return path for digital switching currents from SDO, SDI, and SCK. It must be connected to the system's analog ground plane at a single point near the device (star grounding), not to a separate digital ground plane - preventing ground loops while maintaining noise isolation between analog and digital sections.

Can the LTC1865HMS#TRPBF be used in ratiometric sensor applications, and what design considerations apply?

Yes, the LTC1865HMS#TRPBF supports ratiometric operation by connecting the same reference voltage to both the sensor excitation source and the VREF pin. Key considerations include matching temperature coefficients between sensor and reference, minimizing VREF trace inductance, and using a low-noise, high-PSRR reference buffer - all validated in Linear Technology Application Note 83 for LTC1864/LTC1865.