Analog Devices Inc. LT1102ACN8#PBF

Overview

LT1102ACN8#PBF from Analog Devices (formerly Linear Technology) is a high-speed, precision JFET-input instrumentation amplifier with fixed gains of 10 or 100 in an 8-lead PDIP package. It delivers 30 V/μs slew rate, 35 MHz gain-bandwidth product, 3 μs settling time to 0.01%, ±150 mA output drive, and 600 μV max input + output offset voltage - enabling high-fidelity signal conditioning in multiplexed data acquisition and bridge sensor interfaces.

For engineers reviewing the LT1102ACN8#PBF datasheet, LT1102ACN8#PBF pinout, LT1102ACN8#PBF application, or LT1102ACN8#PBF equivalent, key selection criteria include guaranteed 0.05% max gain error at 0°C–70°C, 40 pA max input bias current, 120 kHz bandwidth at G=100, and robust ±40 V differential input voltage tolerance - all validated for industrial-grade signal integrity.

Technical Context

The LT1102ACN8#PBF uses a two-op-amp architecture where the second stage is decompensated for G=10 stability, enabling high slew rate and bandwidth. Its FET input stage ensures ultra-low input bias current (≤40 pA) and eliminates temperature-doubling behavior seen in bipolar-input competitors.

Common-mode rejection is optimized at G=10 via matched op-amp bandwidths; at G=100, a 18 pF capacitor between pins 1 and 2 restores CMRR across 200 Hz–30 kHz. Input protection clamps beyond supply rails without damage when current is limited to 20 mA.

Key Specifications

Pinout & Package

LT1102ACN8#PBF is housed in an 8-lead plastic DIP (N8) package with 0.300-inch width, lead pitch of 0.100 inch, and through-hole mounting compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8429ARZ and INA128UA, the LT1102ACN8#PBF uniquely balances high speed (30 V/μs), low bias current (40 pA), and fixed-gain simplicity - making it optimal for cost-sensitive, space-constrained industrial DAQ where G=10/100 suffices and settling time is critical.

Availability

LT1102ACN8#PBF is available at Aetrix Electronics and suitable for bridge amplifier circuits, multiplexed data acquisition systems, high-impedance sensor interfaces, and photodetector signal conditioning requiring stable component supply across industrial temperature ranges.

Supply support for LT1102ACN8#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 acquired Linear Technology in 2017 and continues to manufacture, support, and qualify its high-performance analog portfolio including precision amplifiers.

The LT1102 product line was designed specifically for high-speed, high-accuracy instrumentation in industrial sensing and test equipment - emphasizing speed-precision trade-off optimization without external gain components.

FAQ

What is the operating temperature range for the LT1102ACN8#PBF?

The LT1102ACN8#PBF is rated for 0°C to 70°C ambient operation, matching the "AC" grade designation. This range is validated per the manufacturer's electrical characteristics table for parameters including gain error (0.05% max), input bias current (40 pA max), and offset voltage (600 μV max). Operation outside this range may degrade performance or violate absolute maximum ratings.

Does the LT1102ACN8#PBF require external components to set gain?

No, the LT1102ACN8#PBF does not require external components to set gain. It provides factory-trimmed fixed gains of 10 or 100 via internal resistor networks. Gain selection is accomplished by leaving pins 7 and 8 open (G=100) or shorting them together (G=10). This eliminates gain-setting resistor tolerances and temperature drift, ensuring consistent performance across units and temperature.

Can the LT1102ACN8#PBF drive capacitive loads?

Yes, the LT1102ACN8#PBF can drive capacitive loads up to 2.2 nF while maintaining stability, as confirmed in the manufacturer's typical performance curves. For loads exceeding 100 pF, series output resistance (e.g., 10–50 Ω) is recommended to prevent peaking or oscillation. The device's ability to drive 2.2 nF is explicitly documented in the datasheet's "Capacitive Load Handling" plot (TPC08).

What is the maximum differential input voltage rating for the LT1102ACN8#PBF?

The LT1102ACN8#PBF has a maximum differential input voltage rating of ±40 V, as specified in the Absolute Maximum Ratings table. This rating holds across the full supply range (±20 V) and enables robust operation in harsh environments where transient overvoltages may occur - such as industrial motor control feedback or field instrument inputs exposed to lightning-induced surges.

How does the LT1102ACN8#PBF achieve high common-mode rejection at G=100?

The LT1102ACN8#PBF achieves high common-mode rejection at G=100 by adding an 18 pF capacitor between pins 1 and 2. This creates a controlled AC common-mode gain path that cancels inherent roll-off, improving CMRR by ~10 dB from 200 Hz to 30 kHz. This technique is documented in the datasheet's Application Information section and verified in Figure AI01.