Analog Devices Inc./Maxim Integrated MAX4389EXT+T

Overview

MAX4389EXT+T from Analog Devices is a single-channel, rail-to-rail output voltage-feedback operational amplifier with disable functionality, 85MHz -3dB bandwidth, 500V/μs slew rate, and 27MHz 0.1dB gain flatness. It operates from single 4.5V–11V or dual ±2.25V–±5.5V supplies, consumes 5.5mA quiescent current, and delivers ±50mA output drive-optimized for video line driving in surveillance systems and set-top boxes.

For engineers reviewing the MAX4389EXT+T datasheet, MAX4389EXT+T pinout, MAX4389EXT+T application, or MAX4389EXT+T equivalent, this page provides verified electrical specifications, SC70-6 package layout, disable timing (40ns ON / 80ns OFF), differential gain/phase error (0.015%/0.015°), and real-world video interface design context-including 75Ω video line driver configuration and capacitive load stability guidance.

Technical Context

The MAX4389EXT+T employs BiCMOS process technology to combine voltage-feedback architecture with current-feedback techniques, enabling high-speed performance while maintaining unity-gain stability. Its input stage supports common-mode voltage down to VEE (ground in single-supply mode) and up to VCC − 2.25V, while the output stage achieves rail-to-rail swing with <200mV headroom at ±50mA load.

Integrated disable logic asserts high-impedance output (95kΩ) with only 450μA supply current, making it suitable for multiplexed video routing and power-gated signal paths. The device's 1pF input capacitance, 0.6Ω output impedance at 5MHz, and optimized AC response with 24Ω feedback resistor support stable operation in high-frequency analog signal chains.

Key Specifications

Pinout & Package

The MAX4389EXT+T is housed in a 6-pin SC70 package (package code X6SN+1), measuring 2.0mm × 1.25mm × 0.9mm, with exposed pad not electrically connected. This ultra-small outline enables dense PCB layouts in space-constrained video modules and embedded camera interfaces.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS3201DR and LMH6702MF/NOPB, the MAX4389EXT+T uniquely balances broadcast-grade video linearity (0.015%/0.015°), integrated disable, SC70 size, and 5.5mA power-making it the only option qualified for cost-sensitive, space-constrained, standards-compliant analog video output stages.

Availability

MAX4389EXT+T is available at Aetrix Electronics and suitable for surveillance video systems, set-top box designs, and analog-to-digital converter interface circuits requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term availability.

Supply support for MAX4389EXT+T 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and consumer markets since 1965.

The MAX4389EXT+T belongs to the MAX4389/MAX4390/MAX4392–MAX4396 family-designed specifically for high-fidelity, low-power analog video signal conditioning in cost-sensitive consumer and security applications.

FAQ

What is the maximum capacitive load the MAX4389EXT+T can drive without instability?

The MAX4389EXT+T is not optimized for direct capacitive loading. Driving >10pF without isolation causes peaking and potential oscillation. For reliable operation, use a 10Ω–15Ω series isolation resistor between the MAX4389EXT+T output and the capacitive load. With a 15Ω resistor, stable operation is confirmed up to 500pF, as shown in Figure 3 of the datasheet. Always verify stability with actual board parasitics in final layout.

Does the MAX4389EXT+T support true single-supply operation with input referenced to ground?

Yes. The MAX4389EXT+T input common-mode range extends to VEE (ground in single-supply mode), allowing DC-coupled inputs at 0V. Its rail-to-rail output swings within 200mV of both rails under load. When powered from +5V/0V, it fully supports ground-referenced video signals such as CVBS baseband, eliminating the need for input biasing networks or level shifters.

How does the DISABLE pin function on the MAX4389EXT+T, and what is its logic polarity?

The DISABLE pin on the MAX4389EXT+T is active-low: driving it to logic-low (≤VCC − 3V) disables the amplifier, placing the output in high-impedance state (95kΩ) while reducing supply current to 450μA. Driving DISABLE to VCC enables normal operation. The pin has CMOS-compatible thresholds (VIH = VCC − 1.25V, VIL = VCC − 3V) and draws ≤60μA input current-compatible with standard logic families without pull-up/down resistors.

Can the MAX4389EXT+T be used as a 75Ω video line driver without external resistors?

Yes. The MAX4389EXT+T is designed for direct 75Ω video line driving. Configure as a unity-gain buffer with 24Ω feedback resistor (RF) to optimize AC response and minimize peaking. Place a 75Ω series resistor at the output to match coaxial cable impedance and prevent reflections. No additional gain-setting or termination resistors are needed beyond this standard video driver configuration.

What is the thermal performance of the MAX4389EXT+T in the SC70-6 package?

In the SC70-6 package, the MAX4389EXT+T has a junction-to-ambient thermal resistance (θJA) of 326°C/W on a single-layer board and 326.5°C/W on a multilayer board. At 5.5mA quiescent current and 5V supply, power dissipation is ~27.5mW-resulting in <10°C junction rise above ambient. Derating begins above +70°C at 3.1mW/°C; maximum continuous power dissipation at +70°C is 245mW.