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AD7750 데이터시트(PDF) 11 Page - Analog Devices |
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AD7750 데이터시트(HTML) 11 Page - Analog Devices |
11 / 16 page AD7750 –11– REV. 0 Table II. Maximum Output Frequencies H(s) = sRC 1 + sRC R C R = 1M C = 0.0707 F Figure 16. HPF in Channel 1 C1 47nF R2 33k C2 33nF VR2 200 R1 1M PIN 7 VR1 100 R3 1.1k 860:1 ATTENUTATION PIN 6 R4 1.1k C3 33 F Figure 17. Phase Lag Compensation on Channel 1 for 60 Hz Line Frequency ADC 1 PGA FOUT F1 F2 ADC 2 τ V1+ V1– V2+ V2– X2 G1 ACDC HPF PHASE LEAD OF 2.58 C AT 50Hz DIGITAL MULTIPLIER LPF CLKIN FS S2 S1 TIME DELAY 143 s (CLKIN = 3.5795MHz) 2.58 C AT 50Hz DIGITAL-TO-FREQUENCY BLOCK COUNTER/ACCUMULATOR DTF Figure 15. Equivalent AD7750 Signal Processing Chain e d o MS F2 S1 S ) z H ( 2 F , 1 F ) C D ( F T U O ) z H ( ) C D ( ) z H ( 2 F , 1 F ) C A ( F T U O ) z H ( ) C A ( 00 0 0 9 . 2 ± 8 . 66 4 ± 9 0 15 4 . 1 ± 8 . 63 2 ± 9 0 1 10 0 1 9 . 2 o t 03 2 o t 05 4 . 1 o t 05 . 1 1 o t 0 20 1 0 9 . 2 o t 06 4 o t 05 4 . 1 o t 03 2 o t 0 30 1 1 9 . 2 ± 8 . 62 4 1 ± 8 1 25 4 . 1 ± 8 . 62 4 1 ± 8 1 2 41 0 0 8 . 5 ± 6 . 3 12 9 ± 8 1 29 . 2 ± 6 . 3 16 4 ± 8 1 2 51 0 1 8 . 5 o t 02 9 o t 09 . 2 o t 06 4 o t 0 61 1 0 8 . 5 o t 04 8 1 o t 09 . 2 o t 02 9 o t 0 71 1 1 8 . 5 ± 6 . 3 12 4 1 ± 8 1 29 . 2 ± 6 . 3 12 4 1 ± 8 1 2 Digital-to-Frequency Converter (DTF) After they have been filtered, the outputs of the two sigma-delta modulators are fed into a digital multiplier. The output of the multiplier is then low-pass filtered to obtain the real power information. The output of the LPF enters a digital-to-frequency converter whose output frequency is now proportional to the real power. The DTF offers a range of output frequencies to suit most power measurement applications. There is also a high frequency output called FOUT, which can be used for calibra- tion purposes. The output frequencies are determined by the logic inputs FS, S2 and S1. This is explained in the section of this data sheet called Determining the Output Frequencies of the AD7750. Figure 18 shows the waveforms of the various frequency out- puts. The outputs F1 and F2 are the low frequency outputs that can be used to directly drive a stepper motor or electrome- chanical pulse counter. The F1 and F2 outputs provide two alternating low going pulses. The pulsewidth is set at 275 ms and the time between the falling edges of F1 and F2 is ap- proximately half the period of F1. If, however, the period of F1 and F2 falls below 550 ms (1.81 Hz) the pulsewidth of F1 and F2 is set to half the period. For example in Mode 3, where F1 and F2 vary around 6.8 Hz, the pulsewidth would vary from 1/2.(6.8+1.45) seconds to 1/2.(6.8–1.45) seconds—see Table II. |
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