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AD9731BRS Datasheet(PDF) 5 Page - Analog Devices |
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AD9731BRS Datasheet(HTML) 5 Page - Analog Devices |
5 / 11 page AD9731 –5– REV. A PIN FUNCTION DESCRIPTION Pin # Pin Name Pin Description 1 D9(MSB) Most significant data bit of digital input word. 2–9 D8–D1 Eight bits of 10-bit digital input word. 10 D0(LSB) Least significant data bit of digital input word. 11 CLOCK TTL-compatible edge-triggered latch enable signal for on-board registers. 12, 13 NC No internal connection to this pin. 14 DIGITAL +VS +5 V supply voltage for digital circuitry. 15, 18, 28 GND Converter Ground. 16 DIGITAL –VS –5.2 V supply voltage for digital circuitry. 17 RSET Connection for external reference set resistor; nominal 1.96 k Ω. Full-scale output current = 32 (Control Amp in V/RSET). 19 ANALOG RETURN Analog Return. This point and the reference side of the DAC load resistors should be con- nected to the same potential (nominally ground). 20 IOUT Analog current output; full-scale current occurs with a digital word input of all “1s.” With external load resistor, output voltage = IOUT (RLOAD RINTERNAL). RINTERNAL is nominally 240 Ω. 21 IOUTB Complementary analog current output; full-scale current occurs with a digital word input of all “0s.” 22 ANALOG –VS Negative analog supply, nominally –5.2 V. 23 REF IN Normally connected to CONTROL AMP OUT (Pin 24). Direct line to DAC current source network. Voltage changes (noise) at this point have a direct effect on the full-scale output current of the DAC. Full-scale current output = 32 (CONTROL AMP IN/RSET) when using the internal amplifier. DAC load is virtual ground. 24 CONTROL AMP OUT Normally connected to REF IN (Pin 23). Output of internal control amplifier which pro- vides a reference for the current switch network. 25 REF OUT Normally connected to CONTROL AMP IN (Pin 26). Internal voltage reference, nomi- nally –1.25 V. 26 CONTROL AMP IN Normally connected to REF Out (Pin 25) if not connected to external reference. 27 DIGITAL –VS Negative digital supply, nominally –5.2 V. PIN CONFIGURATION GND DIGITAL –VS CONTROL AMP IN REF OUT CONTROL AMP OUT REF IN ANALOG –VS IOUTB IOUT ANALOG RETURN GND RSET DIGITAL –VS GND D8 D7 D9(MSB) D6 D5 D4 D3 D2 D1 D0(LSB) CLOCK NC NC DIGITAL +VS 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 AD9731 NC = NO CONNECT |
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