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HA1-2557883 Datasheet(PDF) 11 Page - Intersil Corporation |
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HA1-2557883 Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 14 page DESIGN INFORMATION (Continued) The information contained in this section has been developed through characterization by Intersil Semiconductor and is for use as application and design information only. No guarantee is implied. 8-22 HA2557 FIGURE 5. FREQUENCY DOUBLER Although the X and Y inputs have similar AC characteristics, they are not the same. The designer should consider input parameters such as small signal bandwidth and ac feedthrough to get the most performance from the HA-2557. The Y channel is the faster of the two inputs with a small sig- nal bandwidth of typically 130MHz verses 75MHz for the X channel. Therefore in AM Signal Generation, the best perfor- mance will be obtained with the Carrier applied to the Y channel and the modulation signal (lower frequency) applied to the X channel. Operation Over a Wide Supply Range The HA-2557 is able to operate over a wide supply voltage range ±5V to ±17.5V. The ±5V range is particularly useful in video applications. At ±5V the input voltage range is reduced to ±1.4V limiting the fullscale output current. Another current output option is the HA-2556 voltage output multiplier config- ured for current output with an output sensing resistor (Refer to the HA-2556 datasheet). Automatic Gain Control Figure 6 shows the HA-2557 configured in an Automatic Gain Control or AGC application. The HA-2842 serves as an output I to V converter using RZ which is trimmed to provide an accurate 4V Fullscale conversion. Refer to Voltage Output Conversion for more details about this function. The HA-5127 low noise amplifier provides the gain control signal to the X input. This control signal sets the peak output volt- age of the multiplier to match the preset reference level. The feedback network around the HA-5127 provides a response time adjustment. High frequency changes in the peak are rejected as noise or the desired signal to be transmitted. These signals do not indicate a change in the average peak value and therefore no gain adjustment is needed. Lower frequency changes in the peak value are given a gain of -1 for feedback to the control input. At DC the circuit is an inte- grator automatically compensating for offset and other con- stant error terms. 1/10KV Ω X Y IOUT VX+ VX- VY+ VY- ACOS( ωτ) ACos ωτ () ACos ωτ () × () 10kV Ω I OUT () = I OUT A 2 20K -------- 1Cos 2 ωτ () + () = RZ WHICH EVALUATES TO: + - + - X FIGURE 6. AUTOMATIC GAIN CONTROL This multiplier has the advantage over other AGC circuits, in that the signal bandwidth is not affected by the control signal gain adjustment. Voltage Output Conversion The HA-2842 is an excellent choice to perform the output current to voltage conversion as shown in Figure 7. The combination of 400V/ µs slew rate and 80MHz Gain Band- width product will maintain signal dynamics while providing a full scale ±4V output. The HA-2842 also provides a hefty out- put drive capability of 100mA. This voltage feedback amplifier takes advantage of the inter- nal RZ resistor, trimmed to provide an accurate 4V fullscale conversion. The parasitic capacitance at the negative input of the HA-2842 must be compensated with a 3pF capacitor from pin 2 to pin 6. This compensation will also insure that the amp will see a noise gain of 2 at its crossover frequency, the minimum required for stability with this device. The full power bandwidth curve and large signal pulse response for this circuit are shown in Typical Performance Curves. The fast slew rate of the HA-2842 results in a minimal reduction of bandwidth for large signals. 5k Ω 10k Ω HA-5127 0.01 µF 10k Ω 0.1 µF 1N914 5.6V 0.1 µF +15V 20k Ω 14 15 16 9 13 12 11 10 1 2 3 4 5 7 6 8 +15V VOUT NC NC NC -15V NC VY VX REF NC NC NC X 0.01 µ 1.0 µ 3pF IOUT 1.0 µ 0.01 µ 2.5K RZ + - HA-2842 + - Y X Spec Number 511064-883 |
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