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AD9002AJ Datasheet(PDF) 4 Page - Analog Devices |
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AD9002AJ Datasheet(HTML) 4 Page - Analog Devices |
4 / 8 page AD9002 –4– REV. D FUNCTIONAL DESCRIPTION Pin # Name Description 1 DIGITAL GROUND One of four digital ground pins. All digital ground pins should be connected together. 2 OVERFLOW INH OVERFLOW INHIBIT controls the data output polarity for overvoltage inputs. t u p n I g o l a n A d e l b a n E w o l f r e v O ) V 2 . 5 – r o g n i t a o l F ( D f o8 D – 1 w o l f r e v O) D N G ( d e t i b i h n I D f o8 D – 1 V N I V + > F E R 0 0 0 0 0 0 0 0 11 1 1 1 1 1 1 1 0 V N I ≤ V + F E R X X X X X X X X 0X X X X X X X X 0 3 HYSTERESIS The Hysteresis control voltage varies the comparator hysteresis from 0 mV to 10 mV, for a change from –5.2 V to –2.2 V at the Hysteresis control pin. Normally converted to –5.2 V. 4+VREF The most positive reference voltage for the internal resistor ladder. 5 ANALOG INPUT One of two analog input pins. Both analog input pins should be connected together. 6 ANALOG GROUND One of two analog ground pins. Both analog ground pins should be connected together. 7 ENCODE Noninverted input of the differential encode input. This pin is driven in conjunction with ENCODE. Data is latched on the rising edge of the ENCODE signal. 8 ENCODE Inverted input of the differential encode input. This pin is driven in conjunction with ENCODE. 9 ANALOG GROUND One of two analog ground pins. Both analog ground pins should be connected together. 10 ANALOG INPUT One of two analog input pins. Both analog inputs should be connected together. 11 –VREF The most negative reference voltage for the internal resistor ladder. 12 REFMID The midpoint tap on the internal resistor ladder. 13 DIGITAL GROUND One of four digital ground pins. All digital ground pins should be connected together. 14 DIGITAL –VS One of two negative digital supply pins (nominally –5.2 V). Both digital supply pins should be con- nected together. 15 D1 (LSB) Digital data output. 16–19 D2–D5 Digital data output. 20 DIGITAL GROUND One of four digital ground pins. All digital ground pins should be connected together. 21, 22 ANALOG –VS One of two negative analog supply pins (nominally –5.2 V). Both analog supply pins should be con- nected together. 23 DIGITAL GROUND One of four digital ground pins. All digital ground pins should be connected together. 24, 25 D6, D7 Digital data output. 26 D8 (MSB) Digital data output. 27 OVERFLOW Overflow data output. Logic high indicates an input overvoltage (V IN > +VREF) if OVERFLOW INHIBIT is enabled (overflow enabled, –5.2 V). See OVERFLOW INHIBIT. 28 DIGITAL –VS One of two negative digital supply pins (nominally –5.2 V). Both digital supply pins should be connected together. DIP TOP VIEW (Not to Scale) 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 AD9002 DIGITAL GROUND REFMID –VREF ANALOG INPUT ANALOG GROUND ENCODE DIGITAL GROUND OVERFLOW INH HYSTERESIS +VREF ENCODE ANALOG GROUND ANALOG INPUT D1(LSB) D2 D3 D4 D5 DIGITAL GROUND ANALOG –VS DIGITAL –VS OVERFLOW D8(MSB) D7 ANALOG –VS DIGITAL GROUND D6 DIGITAL –VS LCC 28 27 1 2 3 426 25 21 22 23 24 19 20 5 6 7 8 9 10 11 12 13 14 15 16 17 18 TOP VIEW (Not to Scale) D7 D6 DIGITAL GROUND ANALOG –VS ANALOG –VS D5 ANALOG INPUT ANALOG GROUND ENCODE ENCODE ANALOG INPUT –VREF AD9002 DIGITAL GROUND ANALOG GROUND JLCC TOP VIEW (Not to Scale) TOP VIEW (Not to Scale) 25 24 23 22 21 20 19 5 6 7 8 9 10 11 18 17 16 15 14 13 12 26 27 28 1 2 3 4 D3 D2 D1(LSB) DIGITAL –VS REFMID D8(MSB) OVERFLOW DIGITAL –VS DIGITAL GROUND OVERFLOW INH HYSTERESIS +VREF D4 AD9002 DIGITAL GROUND PIN DESIGNATIONS |
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