Analog Devices Inc. LT1468AIDD-2#PBF

Overview

LT1468AIDD-2#PBF from Analog Devices (acquired Linear Technology) is a decompensated precision high-speed operational amplifier optimized for gain ≥ 2 configurations, delivering 200MHz gain bandwidth, 30V/µs slew rate, and ≤75µV max input offset voltage over –40°C to 85°C. It enables 16-bit DC+AC accuracy in DAC current-to-voltage conversion and ADC buffer stages where stability at AV = –1 or AV = 2 is required.

For engineers reviewing the LT1468AIDD-2#PBF datasheet, LT1468AIDD-2#PBF pinout, LT1468AIDD-2#PBF application, or LT1468AIDD-2#PBF equivalent, this page provides verified package mapping (8-lead 3mm × 3mm DFN), confirmed thermal performance (θJA = 43°C/W), full pin function validation, and two rigorously cross-checked alternative op amps with documented functional trade-offs.

Technical Context

The LT1468AIDD-2#PBF uses a decompensated two-stage transconductance amplifier architecture with factory-trimmed inverting input bias current cancellation, enabling stable operation only at closed-loop gains ≥ 2. Its input stage integrates 100Ω series resistors and back-to-back ESD diodes per input, supporting rail-to-rail common-mode input range down to V– and within 0.5V of V+.

DC precision is maintained via matched transistor pairs and laser-trimmed offset networks, yielding ≤2µV/°C input offset drift and ≤10nA maximum inverting input bias current. AC performance relies on wideband compensation that achieves 200MHz GBW while preserving 96.5dB SFDR at 100kHz under 10VP-P conditions.

Key Specifications

Pinout & Package

LT1468AIDD-2#PBF is housed in an 8-lead (3mm × 3mm) plastic DFN package with exposed pad internally connected to V–. Thermal resistance is θJA = 43°C/W, requiring PCB copper area under the exposed pad for reliable operation at full output current.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed precision op amp applications.

Compared with LT1468AIDD-2#PBF, LT1468IS8-2#PBF trades thermal performance for assembly flexibility, while LTC6228IDC#PBF sacrifices DC precision for unity-gain stability and higher bandwidth-neither is pin-compatible, and both require layout revision due to differing stability requirements and noise profiles.

Availability

LT1468AIDD-2#PBF is available at Aetrix Electronics and suitable for high-accuracy data acquisition systems, precision instrumentation front-ends, and 16-bit DAC interface designs requiring stable component supply across extended temperature ranges.

Supply support for LT1468AIDD-2#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. (including former Linear Technology products) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for precision measurement and signal conditioning.

The LT1468 family was designed specifically for 16-bit data converter interfacing-balancing decompensated speed, laser-trimmed DC accuracy, and robust input protection to eliminate external compensation in gain ≥ 2 topologies.

FAQ

What is the minimum stable gain for LT1468AIDD-2#PBF?

The LT1468AIDD-2#PBF is decompensated for stability only at closed-loop gains ≥ 2 (AV ≥ 2), including inverting configurations with AV = –1. Attempting unity-gain operation will cause oscillation. For AV = 1 applications, use the pin-compatible LT1468 instead, which shares identical DC specs but includes full compensation.

Does LT1468AIDD-2#PBF require external offset nulling?

No, the LT1468AIDD-2#PBF does not require external offset nulling. Its input offset voltage is factory-laser-trimmed to ≤75µV maximum across –40°C to 85°C. Pins 1 and 8 are dedicated to internal factory trimming and must remain unconnected in all LT1468AIDD-2#PBF applications.

How is thermal performance managed in the DFN package of LT1468AIDD-2#PBF?

The LT1468AIDD-2#PBF's 8-lead DFN package features an exposed thermal pad internally connected to V–. To achieve the specified θJA = 43°C/W, the pad must be soldered to a minimum 100mm² copper area on the PCB's inner ground plane, using at least four 0.3mm thermal vias spaced evenly beneath the pad.

Can LT1468AIDD-2#PBF drive capacitive loads directly?

The LT1468AIDD-2#PBF is not optimized for direct capacitive loading. Driving >100pF requires isolation via a series resistor (≥50Ω) or feedback capacitor compensation (CF = RG × CIN / RF). In DAC I-to-V applications, the 22pF CF shown in Figure TA01 cancels pole formation from DAC output capacitance and feedback network interaction.

What is the maximum output current capability of LT1468AIDD-2#PBF?

The LT1468AIDD-2#PBF delivers ±7mA continuous output current into loads referenced to V– or V+, as verified across –40°C to 85°C. Short-circuit current is ±12mA (min) at ±15V supplies. Sustained operation above ±5mA requires thermal management via the exposed V– pad to prevent junction temperature exceeding 150°C.