Analog Devices Inc. LT1397CDE#PBF

Overview

LT1397CDE#PBF from Analog Devices (formerly Linear Technology) is a quad-channel 400MHz current feedback amplifier optimized for ±5V operation, delivering 80mA output current, 800V/μs slew rate, and 0.1dB gain flatness to 100MHz - deployed in high-speed video loop-through, RGB-to-YUV matrixing, and IF signal conditioning circuits.

For engineers reviewing the LT1397CDE#PBF datasheet, LT1397CDE#PBF pinout, LT1397CDE#PBF application, or LT1397CDE#PBF equivalent, key selection criteria include guaranteed 400MHz bandwidth at unity gain, DFN-14 package thermal performance (θ_JA = 43°C/W), quad-channel channel isolation, and compatibility with 75Ω coaxial video interfaces requiring low differential phase (0.04°) and gain error (0.02%).

Technical Context

The LT1397CDE#PBF implements a current feedback architecture with separate high-impedance noninverting input and low-impedance inverting input, enabling stable wideband operation independent of closed-loop gain configuration when using matched external feedback resistors. Its transimpedance stage drives up to 80mA into 100Ω loads while maintaining 350MHz bandwidth at AV = 2 or –1.

It operates across ±2V to ±6V supplies, draws 4.6mA per amplifier at ±5V, and features rail-to-rail output swing (±3.4V into 150Ω) with 42dB common-mode rejection. The device is fabricated on a proprietary complementary bipolar process, supporting fast transient response (1.3ns rise time) and low distortion (–80dB HD2 at 10MHz).

Key Specifications

Pinout & Package

The LT1397CDE#PBF is housed in a 14-lead (4mm × 3mm × 0.75mm) plastic DFN package with exposed V– pad soldered to PCB for thermal management (θ_JA = 43°C/W). Pin 15 (underside metal) connects internally to V– and must be soldered to ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS3204DGNR and LMH6723MA/NOPB, the LT1397CDE#PBF uniquely delivers quad-channel 400MHz performance in a thermally efficient 4mm × 3mm DFN, making it optimal for space-constrained, multi-path video and IF systems requiring matched channel behavior and minimal inter-channel crosstalk.

Availability

LT1397CDE#PBF is available at Aetrix Electronics and suitable for video distribution, broadcast equipment, medical imaging, and SDR front-end applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant lead-free packaging.

Supply support for LT1397CDE#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.

The LT1397 belongs to Linear Technology's high-speed current feedback amplifier product line, designed specifically for demanding video, instrumentation, and communications applications where bandwidth, slew rate, and video fidelity metrics are critical.

FAQ

What is the maximum capacitive load the LT1397CDE#PBF can drive stably?

The LT1397CDE#PBF can drive up to 1000pF capacitively with appropriate feedback resistor selection - for example, using RF = RG = 255Ω at AV = 2. Stability is maintained by limiting peaking to ≤5dB; larger loads require series output isolation (5–35Ω) or increased RF value per the Typical Performance Characteristics curves in the datasheet. This capability enables direct driving of LCD panel interfaces and long coaxial runs without external buffers.

Does the LT1397CDE#PBF support single-supply operation?

Yes, the LT1397CDE#PBF operates from a single 4V to 12V supply (e.g., +12V and GND), as well as split supplies from ±2V to ±6V. Input common-mode range extends to within 1V of either rail, and output swing reaches ±3.4V into 150Ω on ±5V supplies. For single-supply use, biasing the noninverting inputs at mid-rail is required to maintain linear operation - confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables.

How does the LT1397CDE#PBF achieve 0.04° differential phase performance?

The LT1397CDE#PBF achieves 0.04° differential phase through precision-matched internal transistor pairs, low-input-capacitance design (2.0pF), and optimized current feedback topology that minimizes group delay variation across the 4.43MHz color subcarrier band. Measured per Tektronix TSG120YC/NTSC standards with cascaded ten-stage validation, this performance is guaranteed over temperature and supply variations - critical for broadcast-grade NTSC/PAL decoding where chroma timing errors cause hue shifts.

Is the exposed pad on the LT1397CDE#PBF package electrically connected?

Yes, the exposed pad (Pin 15) on the LT1397CDE#PBF's DFN-14 package is internally connected to the V– supply pin and must be soldered to a PCB ground plane or negative supply copper pour. This connection is mandatory for achieving the specified θ_JA = 43°C/W thermal resistance and preventing junction overheating during sustained 80mA output current operation across all four channels.

Can the LT1397CDE#PBF replace the LT1397CS#PBF in existing SO-14 designs?

No - the LT1397CDE#PBF uses a 14-lead DFN package (4mm × 3mm) with different pinout, thermal pad, and footprint than the 14-lead SOIC (LT1397CS#PBF). While both share identical electrical specifications and quad-channel functionality, the LT1397CDE#PBF requires PCB redesign for land pattern, solder paste stencil, and thermal via placement. It is not a drop-in replacement but offers superior thermal performance and 60% smaller area.