Analog Devices Inc. LT1399IGN#TRPBF

Overview

LT1399IGN#TRPBF from Analog Devices (formerly Linear Technology) is a triple 300MHz current feedback amplifier with independent shutdown pins per channel, designed for RGB video cable driving, LCD display interfaces, and high-speed MUX applications. It delivers 800V/µs slew rate, 30ns turn-on time, ±5V input differential range, and operates from ±2V to ±6V supplies in a 16-pin narrow SSOP package.

For engineers reviewing the LT1399IGN#TRPBF datasheet, LT1399IGN#TRPBF pinout, LT1399IGN#TRPBF application, or LT1399IGN#TRPBF equivalent, key selection criteria include its 300MHz bandwidth at AV = 1/2/–1, 0.1dB gain flatness to 150MHz, high-impedance shutdown state (0µA supply current), fast enable/disable timing, and RGB-specific pin mapping for video signal routing.

Technical Context

The LT1399IGN#TRPBF implements three independent current feedback amplifier channels-R, G, and B-each with dedicated enable (EN) pins and fully isolated inputs/outputs. Its architecture relies on resistive feedback networks (e.g., RF = RG = 324Ω for AV = 2) and exhibits gain-dependent slew rate behavior: 800V/µs at AV = 2 with ±5V supplies, dropping at lower gains due to input-stage limitations.

Each channel achieves 2.5ns propagation delay, 1.3ns rise/fall time, and maintains ≤10% overshoot under 100Ω load conditions. The device supports ±5V operation with ±3.5V input common-mode range and ±3.9V output swing into 100kΩ, while preserving 42–52dB CMRR and 56–70dB PSRR across 10kHz–100MHz.

Key Specifications

Pinout & Package

LT1399IGN#TRPBF is housed in a 16-pin narrow SSOP (GN) package with exposed pad thermal enhancement (θ_JA = 120°C/W). Ground pins (3, 6) are not internally connected; external grounding is required for optimal channel isolation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triple-channel video amplifier applications.

Compared with LT1399CS#TRPBF, LT1399IGN#TRPBF offers superior thermal performance in space-constrained layouts via its GN package's exposed pad, while LT1399HVCS#TRPBF extends voltage headroom at the cost of higher quiescent current (7mA vs 4.6mA per amp) and reduced temperature range margin.

Availability

LT1399IGN#TRPBF is available at Aetrix Electronics and suitable for RGB video cable driving, LCD display interface design, and 3-input video MUX applications requiring stable component supply, consistent parametric performance, and long-term industrial availability.

Supply support for LT1399IGN#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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies.

The LT1399 product line was developed by Linear Technology (acquired by ADI in 2017) to address high-speed video signal conditioning needs in professional displays, broadcast equipment, and portable multimedia systems.

FAQ

What is the maximum capacitive load the LT1399IGN#TRPBF can drive without instability?

The LT1399IGN#TRPBF can drive up to 1000pF directly when using appropriate feedback resistor values (e.g., RF = 365Ω for AV = +1). For larger loads, a 5Ω–35Ω series resistor at the output isolates the capacitance, maintaining stability while trading off gain accuracy. Layout best practices-minimizing inverting-input stray capacitance and separating RF/RG traces-are essential to prevent peaking.

Does the LT1399IGN#TRPBF support single-supply operation?

Yes, the LT1399IGN#TRPBF supports single-supply operation from 4V to 12V (e.g., V+ = 5V, V– = 0V). In this configuration, input voltage range shifts to 0V–4.0V (high) and 0.8V–1.0V (low), and output swing becomes asymmetric (e.g., 0.6V to 4.2V into 150Ω). Performance metrics like bandwidth and slew rate remain valid, but common-mode rejection degrades slightly versus dual-supply use.

How does the enable pin logic work on the LT1399IGN#TRPBF?

The LT1399IGN#TRPBF uses active-low enable logic: each EN pin (EN R, EN G, EN B) must be pulled to V– (or logic low) to activate its respective amplifier channel. When EN is at V+, supply current drops to ≤100µA and the output enters high-impedance state. To ensure reliable disable, EN should be ≥3V below V+; for V+ < 3V, tie EN directly to V–. Enable pin current is typically 30–110µA when active.

Can the LT1399IGN#TRPBF replace the LT1260 in existing designs?

Yes, the LT1399IGN#TRPBF is specified as a pin-for-pin upgrade to the LT1260 for ±5V/±7.5V supply systems. It improves upon the LT1260 with higher bandwidth (300MHz vs 220MHz), faster enable/disable times (30ns/40ns vs 100ns/120ns), lower input offset drift (15µV/°C vs 25µV/°C), and zero shutdown current (vs µA-level in LT1260). No PCB changes are required if operating within ±6V supply limits.

What is the thermal resistance of the LT1399IGN#TRPBF package?

The LT1399IGN#TRPBF uses a 16-pin narrow SSOP (GN) package with θ_JA = 120°C/W, measured under standard JEDEC JESD51-2 conditions (single-layer 1-in² copper pad). This value assumes proper thermal vias to internal ground planes. For high-power operation (>150mW per channel), thermal relief via PCB copper area and airflow should be verified using TJ = TA + (PD × 120°C/W).