Analog Devices Inc. LTC1098LCS8#PBF

Overview

LTC1098LCS8#PBF 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 operates from 2.65V to 4.0V supply, draws only 88μA at 250kHz clock and 1nA in shutdown, and delivers 33kHz sampling rate with ±1.5LSB total unadjusted error over temperature. It is used in battery gas gauges and isolated remote data acquisition systems where low quiescent current and single-supply operation are critical.

For engineers reviewing the LTC1098LCS8#PBF datasheet, LTC1098LCS8#PBF pinout, LTC1098LCS8#PBF application, or LTC1098LCS8#PBF equivalent, key selection criteria include its 2.65V minimum supply voltage, 8-pin SOIC package, 3-wire serial interface compatibility (with DIN/DOUT/CLK), and differential MUX capability enabling ground-referenced or inter-channel difference measurements without external amplifiers.

Technical Context

The LTC1098LCS8#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 and supports up to 250kHz clock frequency at 2.65V supply.

It uses a synchronous half-duplex 4-wire serial interface (CS/SHDN, CLK, DIN, DOUT) with CS-driven wake-up timing: 10μs delay required from CS↓ to first CLK↓ for correct conversion initiation. The VCC pin serves as both power supply and reference input, eliminating need for external VREF when ratiometric operation suffices.

Key Specifications

Pinout & Package

Package: 8-lead plastic SOIC (S8), 3.9mm × 4.9mm body, 1.27mm pitch, RoHS-compliant lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MAX11100ETE+, the LTC1098LCS8#PBF uniquely combines 2.65V operation, integrated dual-channel MUX, and VCC-as-VREF functionality - making it optimal for ultra-low-voltage, multi-signal battery monitoring where BOM reduction and supply tolerance are critical.

Availability

LTC1098LCS8#PBF is available at Aetrix Electronics and suitable for battery gas gauging, remote temperature monitoring, and isolated data acquisition requiring stable component supply across automotive, industrial, and medical device production programs.

Supply support for LTC1098LCS8#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.

The LTC1098LCS8#PBF belongs to ADI's legacy Linear Technology micropower precision ADC product line, designed specifically for energy-constrained applications including portable instrumentation, battery management, and isolated sensing where minimal supply current and small footprint are mandatory.

FAQ

What is the minimum supply voltage required for reliable operation of the LTC1098LCS8#PBF?

The LTC1098LCS8#PBF specifies a minimum supply voltage of 2.65V across its full operating temperature range (0°C to 70°C). Operation below this voltage may result in undefined behavior, missing codes, or failure to complete conversion sequences. This 2.65V threshold enables direct interfacing with partially discharged lithium-ion cells in battery monitoring applications.

Does the LTC1098LCS8#PBF require an external voltage reference?

No, the LTC1098LCS8#PBF does not require an external voltage reference. Its Pin 8 (VCC) serves as both power supply and reference input, supporting ratiometric operation where full-scale range equals VCC. This eliminates external reference components and associated noise paths, though an external reference can be used by connecting VREF to a dedicated source if absolute accuracy is required.

How does the software-selectable multiplexer in the LTC1098LCS8#PBF function during conversion?

The LTC1098LCS8#PBF uses its DIN pin to accept a 1-bit address prior to conversion initiation: logic low selects CH0, logic high selects CH1. This occurs during the CS/SHDN low period before the first CLK edge. The selected channel is sampled and converted, allowing dynamic channel selection without hardware reconfiguration or additional GPIO resources on the host microcontroller.

What is the wake-up timing requirement for the LTC1098LCS8#PBF after asserting CS/SHDN low?

The LTC1098LCS8#PBF requires a 10μs wake-up delay from the falling edge of CS/SHDN to the falling edge of the MSBF bit clock (CLK) to ensure internal circuitry stabilizes before sampling begins. This timing is independent of clock frequency and must be observed in all operating conditions; failure to meet it results in invalid conversion data or increased offset error.

Can the LTC1098LCS8#PBF perform differential measurements between CH0 and CH1?

Yes, the LTC1098LCS8#PBF supports true differential measurement by configuring the internal multiplexer to measure the voltage difference (CH0 – CH1). This mode rejects common-mode noise and enables accurate sensing of small signals superimposed on large DC offsets - such as current-sense shunt voltages in motor control or battery charging circuits - without external instrumentation amplifiers.