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MAX496CSE Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX496CSE Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 12 page Total Noise The MAX496/MAX497’s low input current noise of 2pA/ √Hz and voltage noise of 5.6nV/√Hz provide for lower total noise compared to typical current-mode- feedback amplifiers, which usually have significantly higher input current noise. The input current noise mul- tiplied by the feedback resistor is the dominant noise source of current-mode-feedback amplifiers. Differential Gain and Phase Errors Differential gain and phase errors are critical specifica- tions for a buffer in composite (NTSC, PAL, SECAM) video applications, because these errors correspond directly to color changes in the displayed picture of composite video systems. The MAX496/MAX497’s ultra-low differential gain and phase errors (0.01%/ 0.01°) make them ideal in broadcast-quality composite video applications. Distribution Amplifier The circuit in Figure 3 is a one-to-four distribution amplifier using a single MAX496 or MAX497 IC. A one-to-eight dis- tribution amplifier can be implemented with a MAX496 or MAX497 by driving an additional cable from each of the four outputs. When driving more than four outputs from a single device, see the Continuous Power Dissipation specifications in the Absolute Maximum Ratings. Coaxial Cable Drivers High-speed performance, excellent output current capability, and an internally fixed gain of +2 make the MAX497 ideal for driving back-terminated 50 Ω or 75Ω coaxial cables to ±2.8V. In a typical application, the MAX497 drives a back-ter- minated 75 Ω video cable (Figure 1). The back-termina- tion resistor (at the MAX497’s output) matches the impedance of the cable’s driven end to the cable’s impedance, to eliminate signal reflections. This, along with the load-termination resistor, forms a voltage divider with the load impedance, which attenuates the signal at the cable output by one-half. The MAX497 operates with an internal +2V/V closed-loop gain to pro- vide unity gain at the cable’s output. Capacitive Load Driving In most amplifier circuits, driving large capacitive loads increases the likelihood of oscillation. This is especially true for circuits with high loop gains, such as voltage followers. The amplifier’s output resistance and the capacitive load form an RC filter that adds a pole to the loop response. If the pole frequency is low enough (as when driving a large capacitive load), the circuit phase margin is degraded and oscillation may occur. 375MHz Quad Closed-Loop Video Buffers, AV = +1 and +2 10 ______________________________________________________________________________________ MAX496/MAX497 MAX496/MAX497 VIN = 4Vp-p, f = 10MHz, RS = 75Ω 100 Ω 100 Ω 100 Ω 100 Ω 50 Ω 50 Ω 50 Ω 50 Ω VIN = 4Vp-p, f = 10MHz, RS = 75Ω 100 Ω 100 Ω 100 Ω 100 Ω 50 Ω 50 Ω 50 Ω 50 Ω a) ADJACENT CHANNEL b) ALL-HOSTILE Figure 4. Crosstalk: a) Adjacent Channel; b) All-Hostile |
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