Analog Devices Inc. LT1813DMS8#PBF

Overview

LT1813DMS8#PBF from Analog Devices (formerly Linear Technology) is a dual, low-power, high-speed voltage-feedback operational amplifier with 100MHz gain bandwidth, 750V/µs slew rate, and ±3.5V input common-mode range on ±5V supplies. It delivers ±40mA output current into 100Ω loads and operates from –40°C to 85°C, making it suitable for video amplification, active filter design, and high-fidelity cable driver applications.

For engineers reviewing the LT1813DMS8#PBF datasheet, LT1813DMS8#PBF pinout, LT1813DMS8#PBF application, or LT1813DMS8#PBF equivalent, key selection criteria include unity-gain stability with up to 1000pF capacitive load, 8nV/√Hz input noise, 1.5mV max input offset voltage, and MSOP-8 package compatibility with space-constrained analog signal chains.

Technical Context

The LT1813DMS8#PBF employs a proprietary voltage-feedback topology with current-feedback slewing behavior, enabling high slew rate without sacrificing DC precision. Its complementary bipolar input stage provides first-order bias current cancellation, while internal compensation ensures stability across 0–1000pF capacitive loads in unity gain.

It features rail-to-rail output swing capability (±3.5V into 100Ω on ±5V supplies), supports single 5V operation (1.1V to 3.9V swing with 100Ω load referenced to 2.5V), and maintains 30ns 0.1% settling time for 5V steps - critical for wideband data acquisition and communication receiver front-ends.

Key Specifications

Pinout & Package

LT1813DMS8#PBF is housed in an 8-lead MSOP (MS8) package measuring 3.0mm × 3.0mm × 0.86mm, with exposed pad internally connected to V– for thermal enhancement and EMI reduction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADA4897-2ARMZ and LMH6629MA/NOPB, the LT1813DMS8#PBF uniquely balances 100MHz bandwidth, 750V/µs slew rate, 1000pF load stability, and 3.6mA/amp quiescent current - making it optimal for space-constrained, mixed-signal systems requiring both speed and precision without layout compromises.

Availability

LT1813DMS8#PBF is available at Aetrix Electronics and suitable for video signal conditioning, active filter implementation, and high-speed data acquisition systems requiring stable component supply across industrial temperature ranges.

Supply support for LT1813DMS8#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 maintains its legacy of high-performance analog ICs with rigorous characterization and application-focused design.

The LT1813 product line was engineered specifically for dual-channel, low-power, high-speed signal conditioning in space-constrained systems - emphasizing unity-gain stability, low distortion, and robust capacitive load drive without external compensation.

FAQ

What is the maximum capacitive load the LT1813DMS8#PBF can drive while remaining stable?

The LT1813DMS8#PBF is specified as unity-gain stable with capacitive loads from 0pF to 1000pF. This capability is achieved via internal adaptive compensation that senses the load-induced pole and adds appropriate phase margin. At 1000pF, bandwidth reduces and transient response exhibits mild peaking, but oscillation is prevented - enabling direct coaxial cable driving without series output resistors.

Does the LT1813DMS8#PBF support single-supply operation, and what is its output swing under those conditions?

Yes, the LT1813DMS8#PBF supports single 5V operation. With a 100Ω load referenced to 2.5V, the output swings from 1.1V to 3.9V - a 2.8V peak-to-peak range centered at mid-supply. This rail-to-rail output capability allows use in mixed-signal systems without negative supplies, though input common-mode range is limited to 0.8V to 1.5V (negative) and 3.5V to 4.2V (positive) under these conditions.

What is the input bias current polarity behavior of the LT1813DMS8#PBF, and how should it be handled in precision designs?

The LT1813DMS8#PBF uses parallel NPN/PNP input transistors for first-order bias current cancellation, resulting in input bias current that may be positive or negative depending on beta matching. However, input offset current is tightly controlled (≤400nA). For precision DC accuracy, balanced source resistance (e.g., 100Ω on both +IN and –IN) is recommended - limiting added offset to ≤40µV versus up to 0.4mV with unbalanced sources.

How does the slew rate of the LT1813DMS8#PBF vary with gain configuration, and why?

The LT1813DMS8#PBF's slew rate is proportional to differential input voltage, not closed-loop gain. In low-gain configurations (e.g., AV = –1), a large output step produces a correspondingly large input step, yielding higher measured slew rates (750V/µs typical). In high-gain configurations, the same output step results in smaller input steps and lower effective slew rates. The device is tested and specified at AV = –1 to reflect its maximum capability.

Is the LT1813DMS8#PBF suitable for use as a comparator, and what are the risks?

No, the LT1813DMS8#PBF is not designed for comparator operation. While its inputs tolerate ±6V differential voltage transiently, sustained differential input causes excessive internal current (up to 40mA) and power dissipation, risking junction overheating. Its internal compensation is optimized for linear closed-loop operation - open-loop use leads to slow recovery, latch-up risk, and undefined propagation delay. Dedicated comparators like LTC1540 should be used instead.