MAX498中文资料四路-三路、SPDT、RGB开关，带有250MHz视频缓冲放大器数据手册ADI规格书

描述 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.

特性 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

应用 Application

• 广播与高清晰度电视系统
• 广播级复合视频多路复用
• 医学成像
• 多媒体产品
• 视频编辑
• 视频路由与切换系统
• 工作站