Analog Devices Inc. LT1789IS8-10#PBF

Overview

LT1789IS8-10#PBF from Analog Devices (acquired Linear Technology) is a precision micropower instrumentation amplifier optimized for single-supply operation from 2.2V to 36V, featuring 95μA max supply current, rail-to-rail output swing within 110mV of ground, and externally set gain from 10 to 1000 via a single resistor. It delivers 0.25% max gain error at G=10 and 40ppm max nonlinearity in bridge-sensor signal conditioning for industrial weight scales.

For engineers reviewing the LT1789IS8-10#PBF datasheet, LT1789IS8-10#PBF pinout, LT1789IS8-10#PBF application, or LT1789IS8-10#PBF equivalent, key selection criteria include guaranteed –40°C to +85°C operation, laser-trimmed input offset voltage ≤175μV (G=1000), CMRR ≥92dB at G=10, and stable drive capability into 1000pF capacitive loads - critical for low-noise sensor front-ends with long cables or ADC input filtering.

Technical Context

The LT1789IS8-10#PBF employs a three-op-amp architecture with laser-trimmed thin-film resistors to achieve high common-mode rejection and low gain error across temperature. Its input stage operates with inputs referenced to V– (ground in single-supply mode), enabling true single-supply operation down to 2.2V while maintaining input common-mode range from 0V to (VS – 1.2V).

Gain is set by external resistor RG between pins 1 and 8, where G = 10 × (1 + 200kΩ/RG); this fixed ×10 base gain maximizes dynamic output range and input common-mode headroom when amplification ≥10 is required - distinguishing it from the LT1789-1 variant and enabling precise low-level signal extraction in noisy industrial environments.

Key Specifications

Pinout & Package

LT1789IS8-10#PBF is housed in an 8-lead plastic SO (Small Outline) package, occupying minimal PCB area versus discrete op-amp + resistor implementations. The package is RoHS-compliant and lead-free (Pb-free finish).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar instrumentation amplifier applications.

Compared with AD8421ARMZ and INA333AIDR, the LT1789IS8-10#PBF uniquely balances ultra-low power (95μA), wide supply range (2.2V–36V), guaranteed high CMRR over temperature, and robust 1000pF capacitive load drive - making it the only option qualified for unregulated 24V industrial sensor nodes requiring decade-long field reliability.

Availability

LT1789IS8-10#PBF is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable medical diagnostics, and battery-powered condition monitoring systems requiring stable component supply across extended temperature ranges.

Supply support for LT1789IS8-10#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 technologies, serving industrial, automotive, communications, and healthcare markets.

The LT1789 family was developed by Linear Technology (now part of ADI) specifically for precision, low-power sensor signal conditioning in harsh environments - emphasizing laser-trimmed accuracy, single-supply usability, and robust EMC performance.

FAQ

What is the maximum capacitive load the LT1789IS8-10#PBF can drive stably?

The LT1789IS8-10#PBF is specified to remain stable with capacitive loads up to 1000pF in any gain configuration, as confirmed in the datasheet's Absolute Maximum Ratings and Typical Performance Characteristics (Figure 1789 G28). This allows direct connection to RC anti-aliasing filters or long PCB traces without requiring isolation resistors or compensation networks - a key advantage over many competing instrumentation amplifiers limited to <100pF.

Does the LT1789IS8-10#PBF support true single-supply operation with inputs at ground potential?

Yes, the LT1789IS8-10#PBF supports true single-supply operation with inputs referenced to ground (V–). Its input common-mode range extends to V– (0V) and its output swings within 110mV of ground, enabling direct interfacing with grounded sensors like strain gauges and thermocouples without level-shifting circuitry - a core design feature explicitly stated in the product description and verified in the Electrical Characteristics tables.

What is the guaranteed gain error specification for LT1789IS8-10#PBF over its full operating temperature range?

The LT1789IS8-10#PBF guarantees a maximum gain error of 0.35% at G=10 over the full –40°C to +85°C operating temperature range, as documented in the "ELECTRICAL CHARACTERISTICS" table on page 5 of the datasheet (marked with the "l" symbol denoting –40°C to +85°C coverage). This specification applies under standard test conditions (VS = 3V or 5V, RL = 20kΩ, VREF = half-supply) and reflects laser trimming for production consistency.

How does the LT1789IS8-10#PBF differ from the LT1789IS8-1#PBF in terms of gain architecture and application suitability?

The LT1789IS8-10#PBF uses a fixed ×10 base gain architecture (G = 10 × [1 + 200kΩ/RG]), enabling minimum gain of 10 and optimized input common-mode and output swing ranges for higher-gain sensor interfaces. In contrast, the LT1789IS8-1#PBF offers G = 1 + 200kΩ/RG (minimum gain = 1), better suited for unity-gain buffering or very low-amplification scenarios. The LT1789IS8-10#PBF is preferred when ≥10× gain is required and maximum dynamic range is critical - as confirmed in the "DESCRIPTION" and "FEATURES" sections.

Is the LT1789IS8-10#PBF rated for industrial temperature operation, and what is its guaranteed range?

Yes, the LT1789IS8-10#PBF is rated for industrial temperature operation. The "I" grade suffix confirms it is guaranteed to meet all specifications over –40°C to +85°C, as explicitly stated in the "ORDER INFORMATION" table (page 2) and reinforced in Note 4: "The LT1789I-1/LT1789I-10 is guaranteed to meet the extended temperature limits." This makes it suitable for deployment in factory automation, outdoor metering, and transportation equipment without derating.