Analog Devices Inc. LTC1096IS8#TRPBF

Overview

LTC1096IS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower 8-bit successive-approximation analog-to-digital converter with integrated sample-and-hold, single differential analog input, and 3-wire serial interface. It operates from 3V to 9V supply, draws only 80μA during conversion at 33kHz sampling rate, and auto-shuts down to 1nA quiescent current. It is used in battery-powered sensor monitoring systems requiring low-power ratiometric measurement with external reference.

For engineers reviewing the LTC1096IS8#TRPBF datasheet, LTC1096IS8#TRPBF pinout, LTC1096IS8#TRPBF application, or LTC1096IS8#TRPBF equivalent, key selection criteria include its 8-pin SOIC package, –40°C to +85°C industrial temperature range, 16μs conversion time, ±0.5LSB total unadjusted error over temperature, and compatibility with microcontrollers via CS/CLK/DOUT serial protocol without external clock generation.

Technical Context

The LTC1096IS8#TRPBF implements a switched-capacitor SAR architecture with on-chip sample-and-hold, enabling accurate DC and low-frequency AC signal digitization. Its differential input supports common-mode rejection and ratiometric operation with external VREF, allowing direct connection to transducers with spans as low as 250mV.

Power management is controlled via the CS/SHDN pin: logic low enables active conversion mode (80μA typical), logic high forces shutdown (1nA typical). Wake-up time is fixed at 10μs after CS↓ before first CLK↓, independent of clock frequency, ensuring deterministic timing for low-duty-cycle sensing.

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 MAX11100ASA+, the LTC1096IS8#TRPBF uniquely balances ultra-low 80μA active current, wide 3V–9V supply range, and true differential input - making it optimal for cost-sensitive, long-life, industrial-grade sensor nodes where power budget and analog robustness are primary constraints.

Availability

LTC1096IS8#TRPBF is available at Aetrix Electronics and suitable for battery-operated systems, remote data acquisition, and isolated data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC1096IS8#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 LTC1096 series belongs to ADI's legacy micropower precision ADC product line, designed specifically for energy-constrained sensor interfaces where minimal supply current, guaranteed monotonicity, and robust analog front-end performance are essential.

FAQ

What is the maximum sampling frequency supported by the LTC1096IS8#TRPBF?

The LTC1096IS8#TRPBF supports a maximum sampling frequency of 33kHz under recommended operating conditions (VCC = 5V, fCLK = 500kHz). At lower supply voltages (e.g., 3V), the maximum sampling frequency drops to 16.5kHz due to reduced clock frequency limits. This specification is guaranteed over the full –40°C to +85°C temperature range and reflects the device's ability to complete conversion and prepare for the next sample within the required timing window.

Does the LTC1096IS8#TRPBF require an external reference voltage?

Yes, the LTC1096IS8#TRPBF requires an external reference voltage applied to the VREF pin. It does not include an internal reference. The device supports reference voltages from 2.5V to 5V and is designed for ratiometric operation - meaning the reference can be derived from the same supply powering the sensor, eliminating errors from supply variation. This makes the LTC1096IS8#TRPBF ideal for bridge-based sensors like load cells and RTDs.

How does the shutdown mode work on the LTC1096IS8#TRPBF?

The LTC1096IS8#TRPBF enters shutdown mode when the CS/SHDN pin is driven high. In this state, internal bias currents are cut off, reducing supply current to 1nA typical. The device retains no state and must be woken up with a 10μs delay after CS↓ before the first CLK↓ to ensure proper internal settling. This deterministic wake-up requirement simplifies firmware design for duty-cycled sensor systems.

Can the LTC1096IS8#TRPBF interface directly with a microcontroller GPIO without SPI hardware?

Yes, the LTC1096IS8#TRPBF uses a simple 3-wire synchronous serial interface (CS, CLK, DOUT) that requires no SPI peripheral. Any general-purpose I/O pin can generate the clock, and bit-banged software can sample DOUT on the falling edge of CLK. Its timing specifications - including 200ns DOUT validity after CLK↓ and 10μs wake-up - are fully compatible with standard 8-bit and 32-bit MCUs running at typical system clock speeds.

What is the analog input impedance of the LTC1096IS8#TRPBF?

The LTC1096IS8#TRPBF features high-impedance analog inputs: 25pF capacitance on the selected channel and 5pF on unselected channels. Input leakage current is ±1.0μA over temperature. This combination allows direct connection to high-impedance sources such as thermistors, photodiodes, and piezoelectric sensors without buffer amplifiers - provided source resistance remains below 10kΩ to maintain 0.1LSB accuracy per the datasheet's minimum clock frequency vs. source resistance curve.