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AD652 数据表(PDF) 10 Page - Analog Devices |
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AD652 数据表(HTML) 10 Page - Analog Devices |
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10 / 28 page  AD652 Rev. C | Page 10 of 28 +VS 1 2 3 4 5 6 7 –VS 8 16 15 14 13 12 11 10 9 ONE SHOT AND "D" FLOP QCK D Q 1mA 20k Ω 20k Ω AD652 SYNCHRONOUS VOLTAGE-TO- FREQUENCY CONVERTER 5V REFERENCE RL 5V CLOCK COS ANALOG GND DIGITAL GND FREQ OUT CINT VIN ±5V Figure 10. Bipolar Offset SVFC CONNECTION FOR BIPOLAR INPUT VOLTAGES A bipolar input voltage of ±5 V can be accommodated by injecting a 250 µA current into Pin 5 (see Figure 10). A −5 V signal provides a zero sum current at the integrator summing junction, which results in a zero-output frequency; a +5 V signal provides a 0.5 mA (full-scale) sum current, which results in the full-scale output frequency. Using an external resistor to inject the offset current has some effect on the bipolar offset temperature coefficient. The ideal transfer curve with bipolar inputs is shown in Figure 11. The user actually has four options to use in injecting the bipolar offset current into the inverting input of the op amp: 1. Use an external resistor for ROS and the internal 20 kΩ resistor for RIN (as shown in Figure 10). 2. Use the internal 20 kΩ resistor as ROS and an external RIN. 3. Use two external resistors. 4. Use two internal resistors for RIN and ROS (available on PLCC version only). Option 4 provides the closest to the ideal transfer function as diagrammed in Figure 11. Figure 12 shows the effects of the transfer relation on the other three options. In the first case, the slope of the transfer function is unchanged with temperature. However, VZERO (the input voltage required to produce an output frequency of 0 Hz) and FZERO (the output frequency when VIN = 0 V) changes as the transfer function is displaced parallel to the voltage axis with temperature. In the second case, FZERO remains constant, but VZERO changes as the transfer function rotates about FZERO with temperature changes. In the third case, with two external resistors, the VZERO point remains invariant while the slope and offset of the transfer function change with temperature. If selecting this third option, the user should select low drift, matched resistors. VREF VIN ROS RIN IDEAL TRANSFER RELATION VZERO FOUT FZERO –5V +5V VIN Figure 11. Ideal Bipolar Input Transfer Curve over Temperature IDEAL FOUT FZERO VIN TEMPERATURE PERTURBED TRANSFER VZERO –5V CASE 1 RIN ∼ INTERNAL ROS ∼ EXTERNAL IDEAL FOUT FZERO VIN TEMPERATURE PERTURBED VZERO –5V CASE 2 RIN ∼ EXTERNAL ROS ∼ INTERNAL IDEAL FOUT FZERO VIN TEMPERATURE PERTURBED VZERO –5V CASE 3 RIN ∼ EXTERNAL ROS ∼ EXTERNAL Figure 12. Actual Bipolar Input Transfer over Temperature |
类似零件编号 - AD652_15 |
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类似说明 - AD652_15 |
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