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AD7750AR Datasheet(PDF) 9 Page - Analog Devices |
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AD7750AR Datasheet(HTML) 9 Page - Analog Devices |
9 / 16 page AD7750 –9– REV. 0 DETERMINING THE OUTPUT FREQUENCIES OF THE AD7750 FOUT, F1 and F2 are the frequency outputs of the AD7750. The output frequencies of the AD7750 are a multiple of a binary fraction of the master clock frequency CLKIN. This binary fraction of the master clock is referred to as FMAX in this data sheet. FMAX can have one of two values, FMAX1 and FMAX2, depending on which mode of operation the AD7750 is in. The operating modes of the AD7750 are selected by the logic inputs FS, S2 and S1. The table below outlines the FMAX frequencies and the transfer functions for the various operating modes of the AD7750. NOTES 1The variable k is proportional to the product of the rms differential input voltages on Channel 1 and Channel 2 (V 1 and V2). k = (1.32 × V 1 × V2 × Gain)/V REF 2 2Applies to F OUT only. The variable k is proportional to the instantaneous differential input voltage on Channel 1 (FS = 0, S1 = 1, S0 = 1) or the instantaneous differ- ential voltage on Channel 2 (FS = 1, S1 = 1, S0 = 1), i.e., Channel Monitor Mode. k = (0.81 × V)/V REF V = V1 × Gain or V = V2 × 2 NOTE: V1 and V2 here refer to the instantaneous differential voltage on Channel 1 or Channel 2, not the rms value. e d o MS F2 S1 Sn o i t p i r c s e D e d o M2 F , 1 F 1 ) z H (F T U O 1 ) z H (F X A M 0 000 . e d o M t n e m e r u s a e M r e w o P n o i t a c i l p i t l u M t n a r d n a u Q r u o F . ) t u p t u O e d u t i n g a M d n a n g i S ( F 1 X A M F . k ± 1 X A M F [ . 6 1 1 X A M F . k ± 1 X A M ]F 1 X A M 2 / N I K L C = 9 1 F 1 X A M z H 8 . 6 = 1 001 . e d o M t n e m e r u s a e M r e w o P n o i t a c i l p i t l u M t n a r d n a u Q o w T . ) y l n O e d u t i n g a M ( F . k o t 0 1 X A M F . k o t 0 [ . 8 1 X A M ]F 1 X A M 2 / N I K L C = 9 1 F 1 X A M z H 8 . 6 = 2 010 . e d o M t n e m e r u s a e M r e w o P n o i t a c i l p i t l u M t n a r d n a u Q o w T . ) y l n O e d u t i n g a M ( F . k o t 0 1 X A M F . k o t 0 [ . 6 1 1 X A M ]F 1 X A M 2 / N I K L C = 9 1 F 1 X A M z H 8 . 6 = 3 2 011 V1 F n o e d o M r o t i n o M l e n n a h C . T U O e d o M t n e m e r u s a e M r e w o PF n o1, . ) t u p t u O e d u t i n g a M d n a n g i S ( 2 F F 1 X A M F . k ± 1 X A M F [ . 2 3 1 X A M k ± 2 F . 1 X A M ]F 1 X A M 2 / N I K L C = 9 1 F 1 X A M z H 8 . 6 = 4 100 . e d o M t n e m e r u s a e M r e w o P n o i t a c i l p i t l u M t n a r d n a u Q r u o F . ) t u p t u O e d u t i n g a M d n a n g i S ( F 2 X A M F . k ± 2 X A M F [ . 6 1 2 X A M F . k ± 2 X A M ]F 2 X A M 2 / N I K L C = 8 1 F 2 X A M z H 6 . 3 1 = 5 101 . e d o M t n e m e r u s a e M r e w o P n o i t a c i l p i t l u M t n a r d n a u Q o w T . ) y l n O e d u t i n g a M ( F . k o t 0 2 X A M F . k o t 0 [ . 6 1 2 X A M ]F 2 X A M 2 / N I K L C = 8 1 F 2 X A M z H 6 . 3 1 = 6 110 . e d o M t n e m e r u s a e M r e w o P n o i t a c i l p i t l u M t n a r d n a u Q o w T . ) y l n O e d u t i n g a M ( F . k o t 0 2 X A M F . k o t 0 [ . 2 3 2 X A M ]F 2 X A M 2 / N I K L C = 8 1 F 2 X A M z H 6 . 3 1 = 7 2 111 V2 F n o e d o M r o t i n o M l e n n a h C . T U O , 1 F n o e d o M t n e m e r u s a e M r e w o P . ) t u p t u O e d u t i n g a M d n a n g i S ( 2 F F 2 X A M F . k ± 2 X A M F [ . 6 1 2 X A M k ± 2 F . 2 X A M ]F 2 X A M 2 / N I K L C = 8 1 F 2 X A M z H 6 . 3 1 = Mode Description (Table I) The section of Table I labeled Mode Description summarizes the functional modes of the AD7750. The AD7750 has two basic modes of operation, i.e., four and two quadrant multiplica- tion. The diagram in Figure 14 is a graphical representation of the transfer functions for two and four quadrant multiplication. Four Quadrant Multiplication (Modes 0, 3, 4 and 7) When the AD7750 is operating in its four quadrant multiplica- tion mode the output pulse frequency on F1, F2 and FOUT contains both sign and magnitude information. The magni- tude information is indicated by the output frequency variation (k.FMAX) from a center frequency (FMAX). The sign informa- tion is indicated by the sign of the frequency variation around FMAX. For example if the output frequency is equal to FMAX – k.FMAX then the magnitude of the product is given by k.FMAX and it has a negative sign. Two Quadrant Multiplication (Modes 1, 2, 5 and 6) When operating in this mode the output pulse frequency only contains magnitude information. Again as in the case of four quadrant multiplication the magnitude information is included in the output frequency variation (k.FMAX). However, in this mode the zero power frequency is 0 Hz, so the output frequency variation is from 0 Hz to (k.FMAX) Hz. Also note that a no-load threshold and the reverse polarity indicator are implemented in these modes see No Load Threshold and Reverse Polarity Indicator sections. These modes are the most suitable for a Class 1 meter implementation. Channel Monitor Modes (Modes 3 and 7) In this mode of operation the FOUT pulse frequency does not give product information. When FS = 0, the FOUT output fre- quency gives sign and magnitude information about the volt- age on Channel 1. When FS = 1 the FOUT output frequency gives sign and magnitude information about the voltage on Channel 2. Note the F1, F2 pulse outputs still continue to give power information. Table I. Operating Mode |
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