Analog Devices Inc. LTC1098LIS8#PBF

Overview

LTC1098LIS8#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 2-channel multiplexer. It operates from 2.65V to 4.0V supply, draws only 88μA at 250kHz clock and 1nA in shutdown, and delivers 33kHz max sampling rate with ±1.5LSB total unadjusted error over –40°C to +85°C. It targets battery-powered sensor interfaces requiring low-power serial ADC functionality.

For engineers reviewing the LTC1098LIS8#PBF datasheet, LTC1098LIS8#PBF pinout, LTC1098LIS8#PBF application, or LTC1098LIS8#PBF equivalent, key selection criteria include its 2.65V minimum supply, SO-8 package, 3-wire serial interface (CS/CLK/DOUT) plus DIN for MUX control, 2-channel single-ended input architecture, and guaranteed performance down to –40°C.

Technical Context

The LTC1098LIS8#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 analog input sampling occurring over 1.5 CLK cycles before conversion begins.

It uses a synchronous half-duplex 4-wire serial interface (CS, CLK, DIN, DOUT) where DIN accepts the channel select bit prior to data readout, and DOUT outputs the 8-bit result MSB-first on CLK falling edges. Wake-up time after CS assertion is fixed at 10μs regardless of supply voltage within spec.

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 MAX1110EUA+, the LTC1098LIS8#PBF uniquely combines sub-100μA active current, true 1nA shutdown, integrated 2-channel MUX, and single-supply reference - making it optimal for long-life, dual-sensor, battery-constrained designs where speed is secondary to energy efficiency.

Availability

LTC1098LIS8#PBF is available at Aetrix Electronics and suitable for battery monitoring, temperature measurement, and isolated data acquisition requiring stable component supply across industrial and medical OEM programs.

Supply support for LTC1098LIS8#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 LTC1098LIS8#PBF belongs to ADI's legacy Linear Technology micropower precision ADC family, designed specifically for energy-constrained sensor front-ends in portable, remote, and isolated measurement systems.

FAQ

What is the minimum supply voltage required for reliable operation of the LTC1098LIS8#PBF?

The LTC1098LIS8#PBF specifies a minimum supply voltage of 2.65V across its full operating temperature range (–40°C to +85°C). Below this threshold, parameters including sampling rate, total unadjusted error, and digital input thresholds are not guaranteed. At 2.65V, maximum sampling frequency drops to 16.5kHz and supply current remains 88μA typical at 250kHz clock.

Does the LTC1098LIS8#PBF require an external voltage reference?

No, the LTC1098LIS8#PBF does not require an external voltage reference. Its VCC pin serves a dual function as both power supply and reference input - the full-scale range equals the applied VCC voltage (e.g., 2.65V supply → 0–2.65V input range). This eliminates external reference components and associated drift, simplifying design for cost-sensitive applications.

How does the 2-channel multiplexer in the LTC1098LIS8#PBF operate?

The LTC1098LIS8#PBF uses a serial DIN input to select between CH0 and CH1: a logic high on DIN during the first CLK rising edge after CS assertion selects CH1; logic low selects CH0. The selected channel is sampled and converted in the same cycle. No separate control lines or timing overhead beyond the standard serial frame is required.

What is the wake-up time specification for the LTC1098LIS8#PBF after CS activation?

The LTC1098LIS8#PBF requires a fixed 10μs wake-up time from CS falling edge to the falling edge of the CLK that clocks out the MSB bit. This timing is guaranteed across the full 2.65V–4.0V supply range and –40°C to +85°C temperature range, enabling deterministic low-power sequencing in microcontroller-based systems.

Can the LTC1098LIS8#PBF interface directly with a 3.3V microcontroller GPIO without level shifting?

Yes, the LTC1098LIS8#PBF supports direct interfacing with 3.3V microcontrollers. Its digital inputs (CS, CLK, DIN) accept VIH ≥ 1.9V at VCC = 3.6V and VIL ≤ 0.45V at VCC = 2.65V, while DOUT drives VOH ≥ 2.1V and VOL ≤ 0.3V under 360μA/400μA loads - fully compatible with standard 3.3V CMOS logic levels.