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AD652 Fiches technique(PDF) 11 Page - Analog Devices |
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AD652 Fiches technique(HTML) 11 Page - Analog Devices |
11 / 28 page AD652 Rev. C | Page 11 of 28 NC = NO CONNECT 5 7 8 NC VIN + – NC NC 6 9 10 AD652 SYNCHRONOUS VOLTAGE-TO- FREQUENCY CONVERTER 10k Ω 10k Ω 16k Ω 4k Ω A. PLCC 0V TO 10V INPUT 5 7 8 NC NC NC 6 9 10 AD652 SYNCHRONOUS VOLTAGE-TO- FREQUENCY CONVERTER 10k Ω 10k Ω 16k Ω 4k Ω B. PLCC 0V TO 8V INPUT VIN + – 5 7 8 NC NC NC 6 9 10 AD652 SYNCHRONOUS VOLTAGE-TO- FREQUENCY CONVERTER 10k Ω 10k Ω 16k Ω 4k Ω C. PLCC 0V TO 5V INPUT VIN + – 5 7 8 NC VIN ±5V NC 6 9 10 AD652 SYNCHRONOUS VOLTAGE-TO- FREQUENCY CONVERTER 10k Ω 10k Ω 16k Ω 4k Ω D. PLCC ±5V INPUT 5V REF 20 Figure 13. PLCC CONNECTIONS The PLCC packaged AD652 offers additional input resistors not found on the CERDIP-packaged device. These resistors provide the user with additional input voltage ranges. Besides the 10 V range available using the on-chip resistor in the CERDIP the PLCC also offers 8 V and 5 V ranges. Figure 13A to Figure 13C show the proper connections for these ranges with positive input voltages. For negative input voltages, the appropriate resistor should be tied to analog ground and the input voltage should be applied to Pin 6, the + input of the op amp. Bipolar input voltages can be accommodated by injecting 250 µA into Pin 5 with the use of the 5 V reference and the input resistors. For the ±5 V or ±2.5 V range, the reference output, Pin 20, should be tied to Pin 10. The input signal should then be applied to Pin 8 for a ±5 V signal and to Pin 7 for a ±2.5 V signal. The input connections for a ±5 V range are shown in Figure 13D. For a ±4 V range, the input signal should be applied to Pin 9, and Pin 20 should be connected to Pin 8. GAIN AND OFFSET CALIBRATION The gain error of the AD652 is laser trimmed to within ±0.5%. If higher accuracy is required, the internal 20 kΩ resistor must be shunted with a 2 MΩ resistor to produce a parallel equivalent that is 1% lower in value than the nominal 20 kΩ. Full-scale adjustment is then accomplished using a 500 Ω series trimmer. See Figure 14 and Figure 15. When negative input voltages are used, this 500 Ω trimmer is tied to ground and Pin 6 is the input pin. 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 ONE SHOT AND "D" FLOP QCK D Q 1mA 20k Ω AD652 SYNCHRONOUS VOLTAGE-TO- FREQUENCY CONVERTER 5V REFERENCE VIN +VS 0.02 µF 2M Ω 500 Ω 250k Ω 20k Ω Figure 14. CERDIP Gain and Offset Trim 4 5 6 7 8 18 17 16 15 14 9 10 11 12 13 3 2 1 20 19 1mA 5V REFERENCE AD652 AND "D" FLOP Q CK D Q ONE SHOT 10k Ω 10k Ω 16k Ω 4k Ω SYNCHRONOUS VOLTAGE-TO-FREQUENCY CONVERTER VIN 500 Ω 500 Ω 2M Ω 0.02 µF 20k Ω 350k Ω ±3.5mV OFFSET TRIM Figure 15. PLCC Gain and Offset Trim |
Numéro de pièce similaire - AD652 |
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Description similaire - AD652 |
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