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AD7628TE Arkusz danych(PDF) 7 Page - Analog Devices |
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AD7628TE Arkusz danych(HTML) 7 Page - Analog Devices |
7 / 8 page AD7628 –7– REV. A MICROPROCESSOR INTERFACE Figure 11. AD7628 Dual DAC to 6800 CPU Interface PROGRAMMABLE WINDOW COMPARATOR Figure 13. Digitally Programmable Window Comparator (Upper and Lower Limit Detector) PROGRAMMABLE STATE VARIABLE FILTER Figure 12. AD7628 Dual DAC to 8085 CPU Interface In the circuit of Figure 13, the AD7628 is used to implement a programmable window comparator. DACs A and B are loaded with the required upper and lower voltage limits for the test, respectively. If the test input is not within the programmed lim- its, the pass/fail output will indicate a fail (logic zero). In this state, variable or universal filter configuration (Figure 14) for DACs A1 and B1 control the gain and Q of the filter characteristic, while DACs A2 and B2 control the cutoff fre- quency, fC. DACs A2 and B2 must track accurately for the simple expression for fC to hold. This is readily accomplished by the AD7628. Op amps are 2 × AD644. C3 compensates for the effects of op amp gain-bandwidth limitations. The filter provides low pass, high pass and band pass outputs and is ideally suited for applications where microprocessor con- trol of filter parameters is required, e.g., equalizer, tone con- trols, etc. Programmable range for component values shown is fC = 0 kHz to 15 kHz and Q = 0.3 to 4.5. Figure 14. Digitally Controlled State Variable Filter CIRCUIT EQUATIONS C1 = C2, R1 = R2, R4 = R5 fC = 1 2 π R 1 C1 Q = R 3 R 4 . R F R FBB1 AO = – R F R S NOTE DAC equivalent resistance equals 256 × DAC Ladder resistance () DAC Digital Code |
Podobny numer części - AD7628TE |
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Podobny opis - AD7628TE |
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