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Quad-Triple, SPDT, RGB Switches with 250MHz Video Buffer Amplifiers

Product Details

The MAX498/MAX499 are high-speed, quad/triple, single-pole/double-throw video switches with on-board closed-loop buffer amplifiers. The buffer amplifiers feature +6dB gain (AVCL = 2V/V), 250MHz -3dB bandwidth, 70MHz 0.1dB gain flatness, and 1250V/µs slew rate. Fast switching time (3ns) and fast settling time (12ns for a 4V step) make these devices excellent choices for a wide variety of video applications. The low differential gain/phase errors (0.03%/0.06°) and wide bandwidth make them ideal for both composite-video and RGB applications. The amplifiers are capable of delivering ±2.5V into back-terminated 50Ω or 75Ω cables, and they deliver ±2V to a 75Ω load, allowing multiple cables to be driven from a single output.

For implementation of large switch arrays, a low-power disable mode places the amplifier outputs in a high-impedance state. Channel selection and output enable/disable are controlled by four TTL/CMOS-compatible logic inputs. Each video input is isolated by an AC-ground pin, which minimizes channel-to-channel capacitance and reduces crosstalk to 90dB at 10MHz.

The four-channel MAX498 dissipates 390mW (typical) from ±5VDC power supplies with all output buffers enabled. Power consumption is reduced to 130mW with all buffers disabled. The corresponding dissipation for the three-channel MAX499 is 300mW enabled and 100mW disabled.

Key Features

  • High Speed:
    • 250MHz Small-Signal -3dB Bandwidth
    • 135MHz Full-Power -3dB Bandwidth
  • 70MHz 0.1dB Gain Flatness
  • 1250V/µs Slew Rate
  • 12ns to 0.1% Settling Time
  • 0.03°/0.06% Differential Phase/Gain Error
  • 2pF Input Capacitance
  • 3ns Channel-Switching Time
  • 120mVp-p Channel-Switching Transient
  • Three-State Output Allows Large Switch Arrays
  • Directly Drives 50Ω or 75Ω Back-Terminated Cables

Applications/Uses

  • Broadcast and High-Definition TV Systems
  • Broadcast-Quality Composite-Video Multiplexing
  • Medical Imaging
  • Multimedia Products
  • Video Editing
  • Video Routing and Switching Systems
  • Workstations

Technical Docs

Design & Development

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SIMULATION MODELS

MAX498AVCL Test Circuit File

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SIMULATION MODELS

MAX498 Macromodel

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Support & Training

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Parameters

Key Features

  • High Speed:
    • 250MHz Small-Signal -3dB Bandwidth
    • 135MHz Full-Power -3dB Bandwidth
  • 70MHz 0.1dB Gain Flatness
  • 1250V/µs Slew Rate
  • 12ns to 0.1% Settling Time
  • 0.03°/0.06% Differential Phase/Gain Error
  • 2pF Input Capacitance
  • 3ns Channel-Switching Time
  • 120mVp-p Channel-Switching Transient
  • Three-State Output Allows Large Switch Arrays
  • Directly Drives 50Ω or 75Ω Back-Terminated Cables

Applications/Uses

  • Broadcast and High-Definition TV Systems
  • Broadcast-Quality Composite-Video Multiplexing
  • Medical Imaging
  • Multimedia Products
  • Video Editing
  • Video Routing and Switching Systems
  • Workstations

Description

The MAX498/MAX499 are high-speed, quad/triple, single-pole/double-throw video switches with on-board closed-loop buffer amplifiers. The buffer amplifiers feature +6dB gain (AVCL = 2V/V), 250MHz -3dB bandwidth, 70MHz 0.1dB gain flatness, and 1250V/µs slew rate. Fast switching time (3ns) and fast settling time (12ns for a 4V step) make these devices excellent choices for a wide variety of video applications. The low differential gain/phase errors (0.03%/0.06°) and wide bandwidth make them ideal for both composite-video and RGB applications. The amplifiers are capable of delivering ±2.5V into back-terminated 50Ω or 75Ω cables, and they deliver ±2V to a 75Ω load, allowing multiple cables to be driven from a single output.

For implementation of large switch arrays, a low-power disable mode places the amplifier outputs in a high-impedance state. Channel selection and output enable/disable are controlled by four TTL/CMOS-compatible logic inputs. Each video input is isolated by an AC-ground pin, which minimizes channel-to-channel capacitance and reduces crosstalk to 90dB at 10MHz.

The four-channel MAX498 dissipates 390mW (typical) from ±5VDC power supplies with all output buffers enabled. Power consumption is reduced to 130mW with all buffers disabled. The corresponding dissipation for the three-channel MAX499 is 300mW enabled and 100mW disabled.

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal