Analog Devices Inc. LTC1098CS8#PBF

Overview

LTC1098CS8#PBF from Analog Devices (formerly Linear Technology) is an 8-bit micropower successive-approximation analog-to-digital converter with integrated sample-and-hold and software-selectable 2-channel multiplexer. It operates from 3V to 6V, draws only 88μA at 500kHz clock and 33kHz sampling rate, powers down to 1nA typical, and interfaces via 4-wire serial I/O. It is used in battery gas gauges and isolated remote data acquisition.

For engineers reviewing the LTC1098CS8#PBF datasheet, LTC1098CS8#PBF pinout, LTC1098CS8#PBF application, or LTC1098CS8#PBF equivalent, key selection criteria include its 33kHz max sampling rate, 8-pin SOIC package, ±0.5LSB total unadjusted error over temperature, and dual-channel MUX capability for ground-referenced or differential input configurations.

Technical Context

The LTC1098CS8#PBF implements a switched-capacitor SAR architecture with on-chip sample-and-hold and a 2-channel analog multiplexer controlled via DIN serial 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, CLK, DIN, DOUT), where DIN receives the channel select bit before DOUT transmits the 8-bit result. Wake-up time after CS assertion is 10μs, and it supports clock frequencies up to 500kHz at 5V or 250kHz at 3V.

Key Specifications

Pinout & Package

Package: 8-lead plastic SOIC (S8), 150°C max junction temperature, θJA = 175°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and LTC1096CS8#PBF, the LTC1098CS8#PBF uniquely integrates a software-configurable 2-channel MUX with VCC-as-reference, enabling dual-sensor monitoring in space-constrained battery-powered systems without external components or layout changes.

Availability

LTC1098CS8#PBF is available at Aetrix Electronics and suitable for battery-operated systems, remote data acquisition, and battery gas gauges requiring stable component supply across industrial temperature ranges (0°C to 70°C).

Supply support for LTC1098CS8#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. (including legacy Linear Technology products) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.

The LTC1098CS8#PBF belongs to Linear's micropower precision ADC family, designed specifically for energy-constrained applications such as portable instrumentation, battery monitoring, and isolated sensing where low supply current and small footprint are critical.

FAQ

What is the maximum sampling frequency supported by the LTC1098CS8#PBF?

The LTC1098CS8#PBF supports a maximum sampling frequency of 33kHz under recommended operating conditions (VCC = 5V, fCLK = 500kHz). At 3V operation, the maximum sampling frequency is reduced to 16.5kHz due to slower internal timing margins. This limit ensures ±0.5LSB total unadjusted error is maintained across temperature.

How does the LTC1098CS8#PBF handle channel selection between CH0 and CH1?

The LTC1098CS8#PBF selects between CH0 and CH1 via a single-bit command shifted into the DIN pin before conversion begins. A logic low on DIN selects CH0; a logic high selects CH1. The selection is latched on the first rising edge of CLK after CS goes low, and the corresponding channel is sampled during the subsequent conversion cycle.

Can the LTC1098CS8#PBF operate with an external reference voltage instead of VCC?

No - the LTC1098CS8#PBF does not support an external reference. Pin 8 (VCC/VREF) serves exclusively as both power supply and reference source. For external reference capability, the pin-compatible LTC1096CS8#PBF (differential input, VREF pin) must be used instead.

What is the wake-up time required after asserting CS/SHDN for valid conversion results with the LTC1098CS8#PBF?

The LTC1098CS8#PBF requires a 10μs wake-up time from the falling edge of CS/SHDN to the falling edge of the MSB clock pulse (first CLK↓ after CS↓). This interval allows internal biasing and sample-and-hold settling. If the clock frequency is ≤100kHz, this delay is inherently satisfied by the clock period and no additional timing margin is needed.

Does the LTC1098CS8#PBF include a built-in sample-and-hold circuit?

Yes - the LTC1098CS8#PBF integrates a sample-and-hold function as part of its switched-capacitor SAR architecture. The analog input is sampled for 1.5 clock cycles before conversion begins, ensuring accurate digitization of transient signals without requiring external S/H components.