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MAX4450 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX4450 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 15 page Note: RL = RO + RTO; RTIN and RTO are calculated for 50 Ω applications. For 75Ω systems, RTO = 75Ω; calculate RTIN from the following equation: 0.1µF capacitor as close to the pin as possible. If operat- ing with dual supplies, bypass each supply with a 0.1µF capacitor. Maxim recommends using microstrip and stripline tech- niques to obtain full bandwidth. To ensure that the PC board does not degrade the amplifier’s performance, design it for a frequency greater than 1GHz. Pay care- ful attention to inputs and outputs to avoid large para- sitic capacitance. Whether or not you use a constant- impedance board, observe the following design guide- lines: • Don’t use wire-wrap boards; they are too inductive. • Don’t use IC sockets; they increase parasitic capaci- tance and inductance. • Use surface-mount instead of through-hole compo- nents for better high-frequency performance. • Use a PC board with at least two layers; it should be as free from voids as possible. • Keep signal lines as short and as straight as possi- ble. Do not make 90° turns; round all corners. Rail-to-Rail Outputs, Ground-Sensing Input The input common-mode range extends from (VEE - 200mV) to (VCC - 2.25V) with excellent common- mode rejection. Beyond this range, the amplifier output is a nonlinear function of the input, but does not under- go phase reversal or latchup. The output swings to within 55mV of either power- supply rail with a 2k Ω load. The input ground sensing and the rail-to-rail output substantially increase the dynamic range. With a symmetric input in a single +5V application, the input can swing 2.95VP-P and the out- put can swing 4.9VP-P with minimal distortion. Output Capacitive Loading and Stability The MAX4450/MAX4451 are optimized for AC perfor- mance. They are not designed to drive highly reactive loads, which decrease phase margin and may produce excessive ringing and oscillation. Figure 2 shows a cir- cuit that eliminates this problem. Figure 3 is a graph of the optimal isolation resistor (RS) vs. capacitive load. Figure 4 shows how a capacitive load causes exces- sive peaking of the amplifier’s frequency response if the capacitor is not isolated from the amplifier by a resistor. A small isolation resistor (usually 20 Ω to 30Ω) placed before the reactive load prevents ringing and oscillation. At higher capacitive loads, AC performance is controlled by the interaction of the load capacitance and the isolation resistor. Figure 5 shows the effect of a 27 Ω isolation resistor on closed-loop response. Coaxial cable and other transmission lines are easily driven when properly terminated at both ends with their characteristic impedance. Driving back-terminated transmission lines essentially eliminates the line’s capacitance. Table 1. Recommended Component Values Ultra-Small, Low-Cost, 210MHz, Single-Supply Op Amps with Rail-to-Rail Outputs 8 _______________________________________________________________________________________ -25 +25 -10 +10 -5 +5 -2 +2 -1 +1 49.9 10 ∞ 0 50 1200 GAIN (V/V) 49.9 5 49.9 — 20 500 49.9 15 ∞ 0 50 500 49.9 11 49.9 — 56 500 49.9 25 100 0 100 500 49.9 25 49.9 — 124 500 49.9 50 62 0 250 500 49.9 95 49.9 — 500 500 49.9 49.9 RTO ( Ω) 100 210 Small-Signal -3dB Bandwidth (MHz) 56 49.9 RTIN ( Ω) 0 — RS ( Ω) COMPONENT 500 ∞ RG ( Ω) 500 24 RF ( Ω) R = 75 1- 75 R TIN G Ω |
Similar Part No. - MAX4450_09 |
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Similar Description - MAX4450_09 |
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