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HA5023EVAL Datasheet(PDF) 4 Page - Intersil Corporation |
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HA5023EVAL Datasheet(HTML) 4 Page - Intersil Corporation |
4 / 7 page 4 Application Information Optimum Feedback Resistor Although a current feedback amplifier’s bandwidth dependency on closed loop gain isn’t as severe as that of a voltage feedback amplifier, there can be an appreciable decrease in bandwidth at higher gains. This decrease may be minimized by taking advantage of the current feedback amplifier’s unique relationship between bandwidth and RF. All current feedback amplifiers require a feedback resistor, even for unity gain applications, and RF, in conjunction with the internal compensation capacitor, sets the dominant pole of the frequency response. Thus, the amplifier’s bandwidth is inversely proportional to RF. The HFA1205 design is optimized for a 464 Ω RF at a gain of +2. Decreasing RF decreases stability, resulting in excessive peaking and overshoot (Note: Capacitive feedback will cause the same problems due to the feedback impedance decrease at higher frequencies). At higher gains the amplifier is more stable, so RF can be decreased in a trade-off of stability for bandwidth. The table below lists recommended RF values for various gains, and the expected bandwidth. For good channel-to- channel gain matching, it is recommended that all resistors (termination as well as gain setting) be ±1% tolerance or better. Note that a series input resistor, on +IN, is required for a gain of +1, to reduce gain peaking and increase stability. Overshoot VOUT = 0.5VP-P, VIN tRISE = 2.5ns B 25 -5- % Slew Rate (VOUT = 4VP-P, AV = +1, +RS = 432Ω) +SR B 25 - 1050 - V/ µs -SR B 25 - 750 - V/ µs Slew Rate (VOUT = 5VP-P, AV = +2) +SR B 25 - 1375 - V/ µs -SR B 25 - 875 - V/ µs Slew Rate (VOUT = 5VP-P, AV = -1, RF = 332Ω) +SR B 25 - 2250 - V/ µs -SR B 25 - 1275 - V/ µs Settling Time (VOUT = +2V to 0V step) To 0.1% B 25 - 15 - ns To 0.05% B 25 - 20 - ns To 0.02% B 25 - 30 - ns Overdrive Recovery Time VIN = ±2V B 25 - 10 - ns VIDEO CHARACTERISTICS AV = +2, RF = 464Ω, Unless Otherwise Specified Differential Gain (f = 3.58MHz) RL = 150Ω B 25 - 0.03 - % RL = 75Ω B 25 - 0.03 - % Differential Phase (f = 3.58MHz) RL = 150Ω B 25 - 0.03 - Degrees RL = 75Ω B 25 - 0.05 - Degrees POWER SUPPLY CHARACTERISTICS Power Supply Range C 25 ±4.5 - ±5.5 V Power Supply Current A 25 5.6 5.8 6.1 mA/ Op Amp A Full 5.4 5.9 6.3 mA/ Op Amp NOTE: 3. Test Level: A. Production Tested.; B. Typical or Guaranteed Limit Based on Characterization.; C. Design Typical for Information Only. Electrical Specifications VSUPPLY = ±5V, AV = +1, RF = 560Ω, RL = 100Ω, Unless Otherwise Specified (Continued) PARAMETER TEST CONDITIONS (NOTE 3) TEST LEVEL TEMP. (oC) MIN TYP MAX UNITS GAIN (ACL)RF (Ω) BANDWIDTH (MHz) -1 332 360 +1 464 (+RS = 432Ω) 280 +2 464 400 HFA1205 |
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