Analog Devices Inc. LTC1098ACN8#PBF

Overview

LTC1098ACN8#PBF from Analog Devices (formerly Linear Technology) is a micropower 8-bit successive-approximation ADC with integrated sample-and-hold and software-selectable 2-channel analog multiplexer. It operates from 3V to 6V, draws 88μA typical supply current at 500kHz clock and 33kHz sampling rate, achieves ±0.5LSB total unadjusted error over temperature, and interfaces via 4-wire serial protocol (CS/SHDN, CLK, DIN, DOUT). It targets battery-powered sensor monitoring in portable instrumentation.

For engineers reviewing the LTC1098ACN8#PBF datasheet, LTC1098ACN8#PBF pinout, LTC1098ACN8#PBF application, or LTC1098ACN8#PBF equivalent, key selection criteria include its 33kHz max sampling rate, 1nA shutdown current, 8-pin PDIP package, dual-channel MUX capability, and compatibility with 3V–6V single-supply systems requiring low-power ratiometric conversion.

Technical Context

The LTC1098ACN8#PBF implements a switched-capacitor SAR architecture with on-chip sample-and-hold and a 2-channel analog multiplexer controlled via serial DIN input. Its conversion sequence requires 8 clock cycles per sample, with 1.5 clock cycles allocated for analog input sampling.

It uses a synchronous half-duplex 4-wire serial interface: CS/SHDN enables conversion and powers down the device when high; CLK synchronizes bit transfers on falling edges; DIN accepts channel select bits before conversion; DOUT outputs 8-bit MSB-first data after conversion completion.

Key Specifications

Pinout & Package

Package: 8-Lead Plastic DIP (N8), 0°C to 70°C operating temperature range, θ_JA = 130°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit SAR ADC applications.

Compared with ADS7822U and MAX1110EPA+, the LTC1098ACN8#PBF uniquely integrates a software-configurable 2-channel MUX and achieves 1nA shutdown current-critical for ultra-low-power multi-sensor nodes where minimizing external components and maximizing battery life are primary constraints.

Availability

LTC1098ACN8#PBF is available at Aetrix Electronics and suitable for battery-operated systems, remote data acquisition, and isolated data acquisition requiring stable component supply and long-term manufacturability.

Supply support for LTC1098ACN8#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 acquired Linear Technology in 2017 and maintains full product support, datasheets, and application engineering for legacy Linear parts including the LTC1098 series.

The LTC1098 family was designed specifically for micropower, multi-channel data acquisition in space-constrained, battery-dependent applications-emphasizing ultra-low shutdown current, integrated signal conditioning, and minimal external component requirements.

FAQ

What is the maximum clock frequency supported by the LTC1098ACN8#PBF?

The LTC1098ACN8#PBF supports a maximum clock frequency of 500kHz when operating at VCC = 5V. At lower supply voltages (e.g., 3V), the maximum clock frequency is reduced to 250kHz to maintain timing margins and conversion accuracy. Exceeding these limits may cause increased total unadjusted error or failed conversions.

Does the LTC1098ACN8#PBF require an external reference voltage?

No, the LTC1098ACN8#PBF does not require an external reference voltage. Pin 8 (VCC) serves as both power supply and reference input, enabling ratiometric operation. This allows direct use of the supply rail-ideal for battery-powered systems where reference stability tracks battery voltage decay.

How does the software-selectable multiplexer in the LTC1098ACN8#PBF operate?

The LTC1098ACN8#PBF uses the DIN pin to accept a 1-bit address before conversion: logic low selects CH0, logic high selects CH1. The selected channel is sampled during the next conversion cycle. This eliminates need for external analog switches and reduces control overhead in microcontroller firmware.

What is the wake-up time requirement for the LTC1098ACN8#PBF after CS activation?

The LTC1098ACN8#PBF requires a 10μs wake-up time from CS falling edge to the falling edge of the first CLK pulse that clocks out the MSB. This interval ensures internal biasing and sampling capacitor settling. At clock frequencies ≤100kHz, this delay is inherently satisfied by the clock period.

Can the LTC1098ACN8#PBF operate from a 2.65V supply?

No, the LTC1098ACN8#PBF is rated for 3V to 6V operation. The 2.65V minimum applies only to the LTC1098L variant (e.g., LTC1098LCS8#PBF). Using 2.65V on the LTC1098ACN8#PBF may result in undefined behavior, increased error, or failure to meet AC specifications.