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AD534TCHIP датащи(PDF) 7 Page - Analog Devices |
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AD534TCHIP датащи(HTML) 7 Page - Analog Devices |
7 / 12 page AD534 REV. B –7– OPERATION AS A DIVIDER The AD535, a pin-for-pin functional equivalent to the AD534, has guaranteed performance in the divider and square-rooter configurations and is recommended for such applications. Figure 6 shows the connection required for division. Unlike earlier products, the AD534 provides differential operation on both numerator and denominator, allowing the ratio of two floating variables to be generated. Further flexibility results from access to a high impedance summing input to Y1. As with all dividers based on the use of a multiplier in a feedback loop, the bandwidth is proportional to the denominator magnitude, as shown in Figure 23. X1 X2 Y1 Y2 Z1 Z2 AD534 10V (Z2 – Z1) = (X1 – X2) OUTPUT, 12V PK + Y1 Z INPUT (NUMERATOR) 10V FS, 12V PK X INPUT (DENOMINATOR) +10V FS +12V PK OPTIONAL SUMMING INPUT 10V PK OUT –VS +VS SF + – +15V –15V Figure 6. Basic Divider Connection Without additional trimming, the accuracy of the AD534K and L is sufficient to maintain a 1% error over a 10 V to 1 V denominator range. This range may be extended to 100:1 by simply reducing the X offset with an externally generated trim voltage (range required is ±3.5 mV max) applied to the unused X input (see Figure 1). To trim, apply a ramp of +100 mV to +V at 100 Hz to both X1 and Z1 (if X2 is used for offset adjust- ment, otherwise reverse the signal polarity) and adjust the trim voltage to minimize the variation in the output.* Since the output will be near +10 V, it should be ac-coupled for this adjustment. The increase in noise level and reduction in bandwidth preclude operation much beyond a ratio of 100 to 1. As with the multiplier connection, overall gain can be intro- duced by inserting a simple attenuator between the output and Y2 terminal. This option, and the differential-ratio capability of the AD534 are utilized in the percentage-computer application shown in Figure 12. This configuration generates an output proportional to the percentage deviation of one variable (A) with respect to a reference variable (B), with a scale of one volt per percent. OPERATION AS A SQUARE ROOTER The operation of the AD534 in the square root mode is shown in Figure 7. The diode prevents a latching condition which could occur if the input momentarily changes polarity. As shown, the output is always positive; it may be changed to a negative output by reversing the diode direction and interchang- ing the X inputs. Since the signal input is differential, all combi- nations of input and output polarities can be realized, but operation is restricted to the one quadrant associated with each combination of inputs. X1 X2 Y1 Y2 Z1 Z2 AD534 OUTPUT, 12V PK 10V (Z2 – Z1) +X2 = Z INPUT 10V FS 12V PK OPTIONAL SUMMING INPUT, X, 10V PK OUT –VS +VS SF +15V –15V REVERSE THIS AND X INPUTS FOR NEGATIVE OUTPUTS RL (MUST BE PROVIDED) + – Figure 7. Square-Rooter Connection In contrast to earlier devices, which were intolerant of capacitive loads in the square root modes, the AD534 is stable with all loads up to at least 1000 pF. For critical applications, a small adjustment to the Z input offset (see Figure 1) will improve accuracy for inputs below 1 V. *See the AD535 data sheet for more details. |
Аналогичный номер детали - AD534TCHIP |
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Аналогичное описание - AD534TCHIP |
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