Analog Devices Inc. LTC1098ACS8#TRPBF

Overview

LTC1098ACS8#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 operates from 3V to 6V supply, draws only 88μA typical active current at 500kHz clock, achieves ±0.5LSB total unadjusted error over temperature, and features 3-wire serial interface (CS/CLK/DOUT) plus DIN for channel selection. It is used in battery-powered remote data acquisition systems where low power and direct sensor interfacing are critical.

For engineers reviewing the LTC1098ACS8#TRPBF datasheet, LTC1098ACS8#TRPBF pinout, LTC1098ACS8#TRPBF application, or LTC1098ACS8#TRPBF equivalent, this page delivers verified specifications, SO-8 package layout, real-world use cases in battery monitoring and isolated sensing, and two validated alternative parts with functional and timing differences.

Technical Context

The LTC1098ACS8#TRPBF implements a switched-capacitor SAR architecture with on-chip sample-and-hold, enabling accurate conversion of signals up to 33kHz sampling rate. Its dual-channel MUX allows software-controlled selection between CH0 and CH1 inputs referenced to ground or differential across both channels.

Digital control uses a synchronous half-duplex serial interface: CS enables conversion and wake-up, CLK synchronizes bit transfer on falling edges, DIN accepts 1-bit MUX address before conversion, and DOUT outputs 8-bit result MSB-first. Wake-up time is fixed at 10μs after CS↓ for correct first-bit timing.

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 micropower ADC applications.

Compared with LTC1098ACS8#TRPBF, ADS7822U offers higher speed and SPI compatibility but lacks integrated MUX and consumes 15× more active current, while MAX1110EUA+ provides tighter shutdown current and same MUX functionality but restricts operation to ≤3.6V - making LTC1098ACS8#TRPBF optimal for 3–6V dual-sensor applications demanding balanced performance and micropower efficiency.

Availability

LTC1098ACS8#TRPBF is available at Aetrix Electronics and suitable for battery-operated systems, remote data acquisition, and isolated sensor interfaces requiring stable component supply across industrial and medical product lifecycles.

Supply support for LTC1098ACS8#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. (including legacy Linear Technology products) designs precision analog, mixed-signal, and power management ICs for high-reliability industrial, automotive, and medical applications.

The LTC1098 series belongs to Linear's micropower data acquisition product line, engineered specifically for ultra-low-power sensor interfacing in space- and energy-constrained embedded systems.

FAQ

What is the maximum sampling frequency supported by the LTC1098ACS8#TRPBF?

The LTC1098ACS8#TRPBF supports a maximum sampling frequency of 33kHz under recommended operating conditions (VCC = 5V, fCLK = 500kHz). This is achieved with an 8-clock-cycle conversion time and accounts for minimum CS low time and wake-up requirements. At lower clock frequencies or reduced supply voltages (e.g., 3V), the maximum sampling rate decreases to 16.5kHz.

Does the LTC1098ACS8#TRPBF require an external voltage reference?

No, the LTC1098ACS8#TRPBF does not require an external voltage reference. Pin 8 (VCC/VREF) serves as both the power supply and the reference voltage source, enabling true ratiometric operation. This eliminates external reference components and improves system-level accuracy when sensor excitation and ADC reference share the same supply rail.

How does the dual-channel multiplexer in the LTC1098ACS8#TRPBF operate?

The LTC1098ACS8#TRPBF uses a software-controlled 2-channel MUX: a single-bit address is shifted into the DIN pin (pin 5) on the rising edge of CLK before conversion begins. A logic low selects CH0 (pin 2); a logic high selects CH1 (pin 3). The selected channel is sampled and converted in the subsequent cycle - no external hardware control lines are needed.

What is the wake-up time requirement for the LTC1098ACS8#TRPBF after CS is asserted?

The LTC1098ACS8#TRPBF requires a 10μs wake-up time from the falling edge of CS to the falling edge of the first CLK pulse that clocks the MSB bit. This timing is fixed and independent of supply voltage or temperature. If the system clock frequency is ≤100kHz, the natural clock period inherently satisfies this requirement without additional delay insertion.

Can the LTC1098ACS8#TRPBF operate from a 3.3V supply?

Yes, the LTC1098ACS8#TRPBF is fully specified for operation from 3.0V to 6.0V. At 3.3V, it maintains ±0.5LSB total unadjusted error (A-grade), supports up to 250kHz clock frequency, and delivers 88μA typical active supply current - making it compatible with standard 3.3V microcontroller systems without level translation.