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MAX4212 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX4212 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 16 page 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 guidelines when designing the board: • Don’t use wire-wrap boards because they are too inductive. • Don’t use IC sockets because they increase parasitic capacitance 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 50mV of either power- supply rail with a 10k 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. Enable Input and Disabled Output The enable feature (EN_) allows the amplifier to be placed in a low-power, high-output-impedance state. Typically, the EN_ logic low input current (IIL) is small. However, as the EN voltage (VIL) approaches the nega- tive supply rail, IIL increases (Figure 2). A single resis- tor connected as shown in Figure 3 prevents the rise in the logic-low input current. This resistor provides a feedback mechanism that increases VIL as the logic input is brought to VEE. Figure 4 shows the resulting input current (IIL). When the MAX4213/MAX4218 are disabled, the amplifi- er’s output impedance is 35k Ω. This high resistance and the low 2pF output capacitance make these parts ideal in RF/video multiplexer or switch applications. For larger arrays, pay careful attention to capacitive load- ing. See the Output Capacitive Loading and Stability section for more information. Miniature, 300MHz, Single-Supply, Rail-to-Rail Op Amps with Enable ______________________________________________________________________________________ 11 Table 1. Recommended Component Values Note: RL = RO + RTO; RTIN and RTO are calculated for 50 Ω applications. For 75Ω systems, RTO = 75Ω; calculate RTIN from the following equation: R = 75 1- 75 R TIN G Ω -25 +25 -10 +10 -5 +5 -2 +2 -1 +1 49.9 10 ∞ 0 50 1200 GAIN (V/V) 49.9 6 49.9 — 20 500 49.9 25 ∞ 0 50 500 49.9 11 49.9 — 56 500 49.9 33 100 0 100 500 49.9 25 49.9 — 124 500 49.9 60 62 0 250 500 49.9 105 49.9 — 500 500 49.9 49.9 RTO ( Ω) 90 300 Small-Signal -3dB Bandwidth (MHz) 56 49.9 RTIN ( Ω) 0 — RS ( Ω) COMPONENT 500 ∞ RG ( Ω) 500 24 RF ( Ω) |
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