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AD7664AST Folha de dados(PDF) 11 Page - Analog Devices |
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AD7664AST Folha de dados(HTML) 11 Page - Analog Devices |
11 / 19 page REV. 0 AD7664 –11– Table I. Output Codes and Ideal Input Voltages Digital Output Code Hexa Analog Straight Two’s Description Input Binary Complement FSR –1 LSB 2.499962 V FFFF 1 7FFF 1 FSR – 2 LSB 2.499923 V FFFE 7FFE Midscale + 1 LSB 1.250038 V 8001 0001 Midscale 1.25 V 8000 0000 Midscale – 1 LSB 1.249962 V 7FFF FFFF –FSR + 1 LSB 38 µV 0001 8001 –FSR 0 V 0000 2 8000 2 NOTES 1This is also the code for overrange analog input (V IN – VINGND above VREF – VREFGND). 2This is also the code for underrange analog input (V IN below VINGND) TYPICAL CONNECTION DIAGRAM Figure 5 shows a typical connection diagram for the AD7664. Analog Input Figure 6 shows an equivalent circuit of the input structure of the AD7664. C2 R1 D1 D2 C1 IN OR INGND AGND AVDD Figure 6. Equivalent Analog Input Circuit The two diodes D1 and D2 provide ESD protection for the analog inputs IN and INGND. Care must be taken to ensure that the analog input signal never exceeds the supply rails by more than 0.3 V. This will cause these diodes to become forward- biased and start conducting current. These diodes can handle a forward-biased current of 100 mA maximum. For instance, these conditions could eventually occur when the input buffer’s (U1) supplies are different from AVDD. In such case, an input buffer with a short circuit current limitation can be used to protect the part. 100nF 10 F 100nF 10 F AVDD 10 F 100nF AGND DGND DVDD OVDD OGND WARP IMPULSE SER/ PAR CNVST BUSY SDOUT SCLK RD CS RESET PD IN INGND REFGND 100nF CREF1 2.5V REF1 REF 100 D3 CLOCK AD7664 ANALOG INPUT (0V TO 2.5V) C/ P/DSP SERIAL PORT DIGITAL SUPPLY (3.3V OR 5V) ANALOG SUPPLY (5V) NOTES: 1 THE AD780 IS RECOMMENDED WITH C REF = 47 F. 2 THE AD829 IS RECOMMENDED WITH A COMPENSATION CAPACITOR C C = 82 pF, TYPE CERAMIC NPO. 3 OPTIONAL LOW JITTER CNVST. DVDD CC OB/ 2C 2.7nF U12 15 Figure 5. Typical Connection Diagram |
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