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MAX4135 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX4135 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 12 page _______________Detailed Description The MAX4137/MAX4138 are 1-input/4-output video dis- tribution amplifiers. The MAX4137 is configured for a fixed gain of +2, while the MAX4138 features external gain control (feedback) for closed-loop gains of 2V/V or greater. Each output provides sufficient current to drive five 150 Ω loads. However, distortion will increase when driving multiple loads. The TTL/CMOS-compatible digital control ( SEL_) enables or disables each output amplifier. When the SEL_ control input is low, the amplifier is enabled; when it is high, the amplifier is disabled and presents a high-impedance output. The enable/disable or disable/enable time is under 25ns, which is useful in multiplexing, pixel switching, or picture-in-picture applications. Each device has an input amplifier, which buffers the input from any switching glitches that may be taking place at the output stage, and provides a high- impedance, low-capacitance input. The separate input buffer allows a true high output impedance when an amplifier is disabled. The outputs are protected against short circuits to ground. However, power-dissipation limits preclude shorting all output channels to ground. See the Power- Dissipation Considerations section for details. 1-Input/4-Output Video Distribution Amplifiers _______________________________________________________________________________________ 7 ______________________________________________________________Pin Description Output 4 10 10 14 14 When low, enables output channel OUT3. When high, disables output channel OUT3. 15 15 Analog Ground 4, 9, 21 4, 9, 18, 21 Output 2 5 5 Negative Supply for Output Amplifiers. Connect to -5V. 6, 7 6, 7 Output 3 8 8 Output 1 3 3 Positive Supply for Output Amplifiers. Connect to +5V. 2, 11 2, 11 FUNCTION PIN OUT4 SEL4 SEL3 AGND OUT2 VEEO OUT3 OUT1 VCCO NAME 16 16 VCCI Positive Supply for Input Amplifier. Connect to +5V. — 17 RF Output of Input Amplifier — 18 RG Inverting Input 19 19 VEEI Negative Supply for Input Amplifier. Connect to -5V. 20 20 IN+ Noninverting Input 22 22 SEL2 When low, enables output channel OUT2. When high, disables output channel OUT2. 23 23 SEL1 When low, enables output channel OUT1. When high, disables output channel OUT1. MAX4137 MAX4138 When low, enables output channel OUT4. When high, disables output channel OUT4. No Connect. Not internally connected. 1, 12, 13, 24 1, 12, 13, 17, 24 N.C. |
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