Analog Devices Inc. LTC1392IN8#PBF

Overview

LTC1392IN8#PBF from Analog Devices (formerly Linear Technology) is a micropower 10-bit data acquisition IC integrating ambient temperature sensing, on-chip V_CC monitoring, and rail-to-rail differential voltage measurement. It delivers ±4°C temperature accuracy over –40°C to +85°C, 10-bit resolution for all three measurement modes, and operates from 4.5V to 6V with 700µA active current. It enables compact remote environmental and power integrity monitoring in microcontroller-based systems.

For engineers reviewing the LTC1392IN8#PBF datasheet, LTC1392IN8#PBF pinout, LTC1392IN8#PBF application, or LTC1392IN8#PBF equivalent, key selection considerations include guaranteed industrial-grade temperature accuracy, 3-wire half-duplex serial interface compatibility with 8051/68HC11 ports, differential input full-scale options (0.5V or 1V), low idle current (0.2µA), and PDIP-8 package suitability for prototyping and legacy board layouts.

Technical Context

The LTC1392IN8#PBF implements a successive approximation register (SAR) ADC architecture with integrated bandgap reference (2.42V), sample-and-hold, and analog multiplexer. Its internal temperature sensor uses a proprietary on-die technique yielding linear output code vs. °C (T = Code/4 – 130).

Measurement mode is selected via a 4-bit serial command (Start + SEL1/SEL0 + MSBF), supporting four configurations: temperature, V_CC, differential 1V FS, or differential 0.5V FS. Conversion timing is synchronous to external CLK (150–350 kHz), requiring 10 clock cycles for conversion and 1.5 cycles for sampling.

Key Specifications

Pinout & Package

Package: 8-lead PDIP (N8), 0.300" wide body, through-hole mount. Suitable for breadboarding, manual soldering, and legacy industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar temperature, supply, and differential voltage monitoring applications.

Compared with LTC1392CN8#PBF, the LTC1392IN8#PBF extends operational range to –40°C and guarantees ±4°C accuracy across that span, while ADS1118IRUGT trades guaranteed supply monitoring and ultra-low idle current for higher resolution and lower supply voltage flexibility - making LTC1392IN8#PBF optimal for cost-sensitive, battery-powered industrial monitors needing triple-function integration.

Availability

LTC1392IN8#PBF is available at Aetrix Electronics and suitable for industrial PLCs, embedded power supplies, HVAC sensor nodes, and battery-powered environmental monitors requiring stable component supply across extended temperature ranges.

Supply support for LTC1392IN8#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. (acquired Linear Technology in 2017) designs high-performance analog, mixed-signal, and power management ICs for precision instrumentation, industrial, and communications markets.

The LTC1392 product line was developed to provide integrated, micropower data acquisition solutions for resource-constrained embedded systems requiring simultaneous temperature, supply, and differential signal monitoring - targeting industrial control, remote sensing, and energy-efficient electronics.

FAQ

What measurement modes does the LTC1392IN8#PBF support?

The LTC1392IN8#PBF supports four configurable measurement modes selected via its 4-bit serial command: ambient temperature, on-chip V_CC supply voltage, differential input with 1V full-scale range, and differential input with 0.5V full-scale range. Each mode yields a 10-bit unipolar output code, with dedicated conversion equations provided in the datasheet for accurate interpretation of the LTC1392IN8#PBF's digital output.

How does the LTC1392IN8#PBF achieve ±4°C temperature accuracy over –40°C to +85°C?

The LTC1392IN8#PBF achieves ±4°C accuracy across the industrial temperature range through production trimming of its proprietary on-die temperature sensor and internal 10-bit SAR ADC. This calibration is performed at multiple temperatures during manufacturing, and the LTC1392IN8#PBF's guaranteed limits reflect worst-case deviation from ideal linear response (T = Code/4 – 130) over the full –40°C to +85°C range, as specified for the "I" grade variant.

Can the LTC1392IN8#PBF measure both temperature and supply voltage simultaneously?

No - the LTC1392IN8#PBF performs one measurement per conversion cycle, selected by the 4-bit configuration word sent on DIN. To obtain both temperature and V_CC readings, the host MCU must issue two separate serial commands: one with SEL1/SEL0 = 00 for temperature, then another with SEL1/SEL0 = 01 for supply voltage. The LTC1392IN8#PBF does not support concurrent or interleaved acquisition of multiple parameters.

What is the purpose of the MSBF bit in the LTC1392IN8#PBF's serial command?

The MSBF (Most Significant Bit First) bit in the LTC1392IN8#PBF's 4-bit input command determines output data format: when MSBF = 1, the 10-bit conversion result is shifted out MSB-first on DOUT; when MSBF = 0, the result is output MSB-first followed by LSB-first. This dual-format capability allows seamless interfacing with MCUs having either MSB-first (e.g., 8051) or LSB-first (e.g., some DSPs) serial peripherals without requiring software bit-reversal for the LTC1392IN8#PBF's output stream.

Is the LTC1392IN8#PBF pin-compatible with other members of the LTC1392 family?

Yes - the LTC1392IN8#PBF shares identical pinout and electrical interface with all N8 (PDIP-8) and S8 (SO-8) variants of the LTC1392, including LTC1392CN8#PBF, LTC1392IS8#PBF, and LTC1392CS8#PBF. The only functional differences between these parts are temperature grade (C vs. I), initial accuracy, and guaranteed operating range - all mechanical and serial interface behavior remains consistent across the LTC1392IN8#PBF and its family members.