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AD679BD Datasheet(PDF) 6 Page - Analog Devices |
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AD679BD Datasheet(HTML) 6 Page - Analog Devices |
6 / 12 page AD679 REV. C –6– PIN DESCRIPTION 28-Pin 44-Lead DIP JLCC Symbol Pin No. Pin No. Type Name and Function AGND 7 11 P Analog Ground. This is the ground return for AIN only. AIN 6 10 AI Analog Signal Input. BIPOFF 10 15 AI Bipolar Offset. Connect to AGND for +10 V input unipolar mode and straight binary output coding. Connect to REFOUT for ± 5 V input bipolar mode and twos complement binary output coding. CS 4 6 DI Chip Select. Active LOW. DGND 12, 14 23 P Digital Ground. DB7–DB0 26–19 40, 39, 37, 36, DO Data Bits. These pins provide all 14 bits in two bytes (8+6 bits). Active HIGH. 35, 34, 33, 31 EOC 27 42 DO End-of-Convert. EOC goes LOW when a conversion starts and goes HIGH when the conversion finishes. In asynchronous mode, EOC is an open drain output and requires an external 3 k Ω pull-up resistor. See EOCEN and SYNC pins for information on EOC gating. EOCEN 1 1 DI End-of-Convert Enable. Enables EOC pin. Active LOW. HBE 15 25 DI High Byte Enable. If LOW, output contains high byte. If HIGH, output contains low byte (corresponding to the most recently read high byte). OE 2 3 DI Output Enable. A down-going transition on OE enables DB7–DB0. Gated with CS . Active LOW. REFIN 9 14 AI Reference Input. +5 V input gives 10 V full-scale range. REFOUT 8 12 AO +5 V Reference Output. Tied to REFIN for normal operation. SC 3 5 DI Start Convert. Active LOW. See SYNC pin for gating. SYNC 13 21 DI SYNC Control. If tied to VDD (synchronous mode), SC and EOCEN are gated by CS. If tied to DGND (asynchronous mode), SC and EOCEN are indepen- dent of CS, and EOC is an open drain output. EOC requires an external 3 k Ω pull-up resistor in asynchronous mode. VCC 11 17 P +12 V Analog Power. VEE 5 8 P –12 V Analog Power. VDD 28 43 P +5 V Digital Power. — 16 U Tie to DGND. — 17–18 2, 4, 7, 9, 13, U These pins are unused and should be connected to DGND or VDD. 16, 18, 19, 20, 22, 24, 26, 27, 28, 29, 30, 32, 38, 41, 44 Type: AI = Analog Input. AO = Analog Output. DI = Digital Input (TTL and 5 V CMOS compatible). DO = Digital Output (TTL and 5 V CMOS compatible). All DO pins are three-state drivers. P = Power. U = Unused. PIN CONFIGURATION DIP Package JLCC Package |
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