Electronic Components Datasheet Search |
|
MAX4158 Datasheet(PDF) 10 Page - Maxim Integrated Products |
|
MAX4158 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 16 page 350MHz/250MHz, 2-Channel Video Multiplexer-Amplifiers 10 ______________________________________________________________________________________ _______________Detailed Description The MAX4158/MAX4159 are optimized for closed-loop gains (AVCL) of 1V/V (0dB) or greater; the MAX4258/ MAX4259 are optimized for closed-loop gains of 2V/V (6dB) or greater. These low-power, high-speed, cur- rent-mode feedback amplifiers operate from ±5V sup- plies. They drive video loads (including 50 Ω and 75Ω cables) with excellent distortion characteristics. Differential gain and phase errors are 0.01%/0.01° for MAX4158/MAX4159 and 0.01%/0.02° for MAX4258/ MAX4259, respectively. The input multiplexers feature very short switching times and small switching transients. They also have high input resistance and constant input capacitance, so overall input impedance can be set by external input terminating resistors. Each video input is isolated by an AC-ground pin, which reduces channel-to-channel capacitance and minimizes crosstalk. The MAX4159/MAX4259 have address latching and an output enable function that places the output in a high- impedance state. These functions allow multiple mux/amps to be paralleled together to form larger switching arrays. ________________________Truth Tables Input Control Logic X = Don’t Care MAX4159/MAX4259 Output Control Logic All logic levels (EN, LE, and A0) default low (0) if left open circuit. Output disable is completely independent of input address and latch. __________Applications Information Theory of Operation Since the MAX4158/MAX4159/MAX4258/MAX4259 are current-mode feedback amplifiers, their open-loop transfer function is expressed as a transimpedance, ∆VOUT/∆IFB, or ZT. The frequency behavior of this open-loop transimpedance is similar to the open-loop gain of a voltage-mode feedback amplifier. That is, it has a large DC value and decreases at approximately 6dB per octave at high frequency. Analyzing the current-mode feedback amplifier in a gain configuration (Figure 1) yields the following trans- fer function: VOUT / VIN = G x ZT(S) / (ZT(S) + G x RIN(FB) + RF) where G = AVCL = 1 + RF / RG. At low gains, G x RIN(FB) << RF. Therefore, unlike tradi- tional voltage-mode feedback amplifiers, the closed- loop bandwidth is essentially independent of closed-loop gain. Note also that at low frequencies, ZT >> [G x RIN(FB) + RF] so: VOUT / VIN = G = 1 + RF / RG Layout and Power-Supply Bypassing The MAX4158/MAX4159/MAX4258/MAX4259 have extremely high bandwidth, and consequently require careful board layout, including the possible use of con- stant-impedance microstrip or stripline techniques. MAX4158 MAX4159 MAX4258 MAX4259 RG FB ZT RIN(FB) OUT +1 IN0 IN1 VIN RF +1 Figure 1. Current-Mode Feedback Amplifier On AMPLIFIER OUTPUT Off 0 Output on LOGIC INPUT ( E EN N ) FUNCTION 1 Output off; high impedance LE A0 AMPLIFIER INPUT LOGIC INPUTS FUNCTION [LAST] 1 X Channel addresses latched; retains last input address. IN1 0 1 Channel 1 selected IN0 0 0 Channel 0 selected |
Similar Part No. - MAX4158 |
|
Similar Description - MAX4158 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |