Analog Devices Inc. LTC1098IS8#TRPBF

Overview

LTC1098IS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower 8-bit successive-approximation analog-to-digital converter with integrated sample-and-hold and software-selectable dual-channel multiplexer. It draws only 88 μA at 5 V/500 kHz operation, powers down to 1 nA, achieves ±0.5 LSB total unadjusted error over temperature, and supports 33 kHz sampling in 8-pin SOIC for battery monitoring and isolated sensor interfaces.

For engineers reviewing the LTC1098IS8#TRPBF datasheet, LTC1098IS8#TRPBF pinout, LTC1098IS8#TRPBF application, or LTC1098IS8#TRPBF equivalent, key selection criteria include its 2-channel MUX capability, 1 nA shutdown current, 3-wire serial interface compatibility, −40°C to +85°C industrial temperature range, and direct connection support for low-voltage transducers without gain stages.

Technical Context

The LTC1098IS8#TRPBF implements a switched-capacitor SAR architecture with on-chip sample-and-hold, enabling accurate DC and low-frequency AC conversion without external hold capacitors. Its software-controlled 2-channel analog multiplexer allows sequential sampling of CH0 and CH1 relative to ground or as differential inputs.

It uses a synchronous half-duplex 4-wire serial interface (CS/SHDN, CLK, DIN, DOUT) where DIN accepts channel select bits before DOUT returns the 8-bit result on falling clock edges. Wake-up time is fixed at 10 μs after CS assertion, independent of clock frequency, ensuring deterministic timing for microcontroller integration.

Key Specifications

Pinout & Package

Package: 8-lead plastic SOIC (S8), −40°C to +85°C operating temperature range, θJA = 175°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MAX1110EUA+, the LTC1098IS8#TRPBF uniquely combines dual-channel MUX, 1 nA shutdown, VCC-referenced operation, and −40°C to +85°C rating - making it optimal for rugged, battery-constrained industrial sensor nodes requiring minimal external components.

Availability

LTC1098IS8#TRPBF is available at Aetrix Electronics and suitable for battery-operated systems, remote data acquisition, and isolated sensor interfaces requiring stable component supply across extended temperature ranges.

Supply support for LTC1098IS8#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC1098 series belongs to ADI's legacy micropower precision ADC product line, designed specifically for ultra-low-power, space-constrained applications where battery life, thermal management, and component count are critical constraints.

FAQ

What is the maximum clock frequency supported by LTC1098IS8#TRPBF at 5 V supply?

The LTC1098IS8#TRPBF supports a maximum clock frequency of 500 kHz when operated at VCC = 5 V. At this rate, the device achieves a 33 kHz sampling rate with 88 μA supply current. Exceeding 500 kHz may cause timing violations or increased conversion error beyond the specified ±0.5 LSB total unadjusted error.

Does LTC1098IS8#TRPBF require an external voltage reference?

No, the LTC1098IS8#TRPBF does not require an external voltage reference. Pin 8 (VCC/VREF) serves as both power supply and reference input, enabling ratiometric operation. This eliminates reference drift and simplifies design for applications like resistive sensor measurement where the sensor and ADC share the same supply rail.

How does the software-selectable multiplexer in LTC1098IS8#TRPBF operate?

The LTC1098IS8#TRPBF multiplexer is controlled via the DIN pin: a logic low selects CH0, and a logic high selects CH1. The channel is latched on the first rising edge of CLK after CS goes low. This allows dynamic channel selection per conversion cycle without reconfiguring hardware, supporting flexible dual-sensor polling in a single IC.

What is the wake-up time specification for LTC1098IS8#TRPBF after CS assertion?

The LTC1098IS8#TRPBF requires a 10 μs wake-up time from CS falling edge to the falling edge of the MSB clock pulse. This timing is guaranteed across the full −40°C to +85°C temperature range and all valid supply voltages. If the system clock frequency is ≤100 kHz, this delay is inherently satisfied by the clock period.

Can LTC1098IS8#TRPBF operate from a 3.3 V supply?

Yes, the LTC1098IS8#TRPBF operates from 3.0 V to 6.0 V, including 3.3 V. At VCC = 3.3 V, it supports up to 250 kHz clock frequency and delivers 16.5 kHz maximum sampling rate with 88 μA typical supply current. Input logic thresholds scale with VCC, ensuring compatibility with standard 3.3 V microcontrollers.