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AD7264BCPZ Datasheet(PDF) 13 Page - Analog Devices |
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AD7264BCPZ Datasheet(HTML) 13 Page - Analog Devices |
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13 / 30 page 
AD7264 Data Sheet Rev. D | Page 12 of 29 –90 –88 –86 –84 –82 –78 –76 –74 –72 –80 –70 1 23468 12 16 24 32 48 64 96 128 GAIN AVCC = 5V VDRIVE = 5V fS = 1MSPS INTERNAL REFERENCE fRIPPLE = 50kHz Figure 17. Common-Mode Rejection vs. Gain –80 –79 –78 –77 –76 –75 –74 –73 –72 –71 –70 0 20 40 60 80 100 120 140 160 180 200 RIPPLE FREQUENCY (kHz) AVCC = 5V VDRIVE = 5V fS = 1MSPS VRIPPLE = 700mV p-p GAIN = 2 INTERNAL REFERENCE Figure 18. Common-Mode Rejection vs. Common-Mode Ripple Frequency –100 –90 –80 –70 –60 –50 –40 –30 –20 –10 1.3 1.5 1.7 1.9 2.1 2.3 2.5 2.7 2.9 3.1 3.3 3.5 3.7 G = 2 G = 3 G = 12 G = 24 G ≥ 32 G = 8 G = 16 VCM RANGE (V) AVCC = 5V VDRIVE = 5V fS = 1MSPS fIN = 100kHz INTERNAL REFERENCE G = 1 G = 4 G = 6 Figure 19. THD vs. Common-Mode Voltage Range for Various PGA Gain Settings OVERDRIVE VOLTAGE (mV) 0 1 2 3 4 5 6 7 8 9 10 0 102030405060708090 100 L TO H, CA_CBVCC = 4.5V L TO H, CA_CBVCC = 5V H TO L, CA_CBVCC = 3.6V H TO L, CA_CBVCC = 4.5V H TO L, CA_CBVCC = 5V H TO L, CA_CBVCC = 2.7V L TO H, CA_CBVCC = 3.6V L TO H, CA_CBVCC = 2.7V AVCC = 5V VDRIVE = 3.3V TA = 25°C Figure 20. Propagation Delay for Comparator A and Comparator B vs. Overdrive Voltage for Various Supply Voltages 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 OVERDRIVE VOLTAGE (mV) 0 10203040 5060708090 100 H TO L, CC_CDVCC = 4.5V H TO L, CC_CDVCC = 5V L TO H, CC_CDVCC = 3.6V L TO H, CC_CDVCC = 4.5V L TO H, CC_CDVCC = 5V L TO H, CC_CDVCC = 2.7V H TO L, CC_CDVCC = 3.6V H TO L, CC_CDVCC = 2.7V AVCC = 5V VDRIVE = 3.3V TA = 25°C Figure 21. Propagation Delay for Comparator C and Comparator D vs. Overdrive Voltage for Various Supply Voltages SUPPLY RIPPLE FREQUENCY (kHz) –120 –115 –110 –105 –100 –95 –90 –85 –80 –75 0 200 400 600 800 1000 –70 VDRIVE = 5V GAIN = 2 TA = 25°C INTERNAL REFERENCE 100mV p-p SINE WAVE ON AVCC AVCC DECOUPLED WITH 10µF AND 100nF CAPACITORS Figure 22. Power Supply Rejection Ratio |
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