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HA1-2556-9 Datasheet(PDF) 9 Page - Intersil Corporation |
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HA1-2556-9 Datasheet(HTML) 9 Page - Intersil Corporation |
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9 / 18 page  9 FN2477.6 April 29, 2008 HA-2556. Some other possible multi-operator functions are shown in Figures 12, 13 and 14. Of course the HA-2556 is also well suited to standard multiplier applications such as Automatic Gain Control and Voltage Controlled Amplifier. Automatic Gain Control Figure 15 shows the HA-2556 configured in an Automatic Gain Control or AGC application. The HA-5127 low noise amplifier provides the gain control signal to the X input. This control signal sets the peak output voltage 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 integrator automatically compensating for Offset and other constant error terms. This multiplier has the advantage over other AGC circuits, in that the signal bandwidth is not affected by the control signal gain adjustment. Voltage Controlled Amplifier A wide range of gain adjustment is available with the Voltage Controlled Amplifier configuration shown in Figure 16. Here the gain of the HFA0002 can be swept from 20V/V to a gain of almost 1000V/V with a DC voltage from 0V to 5V. Wave Shaping Circuits Wave shaping or curve fitting is another class of application for the analog multiplier. For example, where a nonlinear sensor requires corrective curve fitting to improve linearity the HA-2556 can provide nonintegral powers in the range of 1 to 2 or nonintegral roots in the range of 0.5 to 1.0 (refer to “References” on page 11). This effect is displayed in Figure 17. FIGURE 13. PERCENTAGE DEVIATION FIGURE 14. DIFFERENCE DIVIDED BY SUM S (For A + B ≥ 0V) HA-2556 1/5V X Y Z VX+ VX- VY+ VY- VZ+ VZ- ∑ W = 5(A2-B2) A B 5k 5k 5k 5k + - + - A + - + - FIGURE 12. DIFFERENCE OF SQUARES HA-2556 1/5V X Y VOUT Z VX+ VX- VY+ VY- VZ+ VZ- ∑ W = 100 B A A - B A 95k 5k R2 R1 R1 and R2 set scale to 1V/%, other scale factors possible. For A ≥ 0V. + - + - A + - + - HA-2556 1/5V X Y VOUT Z VX+ VX- VY+ VY- VZ+ VZ- ∑ W = 10 B A A - B B + A 5k 5k + - + - A + - + - FIGURE 15. AUTOMATIC GAIN CONTROL NC NC VY+ V- VOUT V+ NC NC 50 Ω HA-2556 5k Ω 10k Ω HA-5127 0.01 μF 10k Ω 0.1 μF 1N914 5.6V 0.1 μF +15V 20k Ω NC NC + - 14 15 16 9 13 12 11 10 1 2 3 4 5 7 6 8 Σ + - REF Y X Z HA-2556 |
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