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AD678AJ датащи(PDF) 6 Page - Analog Devices |
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AD678AJ датащи(HTML) 6 Page - Analog Devices |
6 / 14 page AD678 REV. C –6– PIN DESCRIPTION 28-Lead DIP 44-Lead Symbol Pin No. JLCC 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 through 50 Ω resistor for ±5 V input bipolar mode and twos complement binary output coding. See Figures 7 and 8. CS 4 6 DI Chip Select. Active LOW. DGND 14 23 P Digital Ground DB11–DB4 26–19 40, 39, 37, 36, DO Data Bits 11 through 4. In 12-bit format (see 12/ 8 pin), these pins provide the upper 8 bits 35, 34, 33, 31 of data. In 8-bit format, these pins provide all 12 bits in two bytes (see R/ L pin). Active HIGH. DB3, DB2 18, 17 30, 27 DO Data Bits 3 and 2. In 12-bit format, these pins provide Data Bit 3 and Data Bit 2. Active HIGH. In 8-bit format they are undefined and should be tied to VDD. DB1 (R/ L) 16 26 DO In 12-bit format, Data Bit 1. Active HIGH. DB0 ( HBE) 15 25 DO In 12-bit format, Data Bit 0. Active HIGH. EOC 27 42 DO End-of-Convert. EOC goes LOW when a conversion starts and goes HIGH when the conversion is finished. 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 (DB0) 15 25 DI In 8-bit format, High Byte Enable. If LOW, output contains high byte. If HIGH, output contains low byte. OE 2 3 DI Output Enable. The falling edge of OE enables DB11–DB0 in 12-bit format and DB11–DB4 in 8-bit format. 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 through 50 Ω resistor for normal operation. R/ L (DB1) 16 26 DI In 8-bit format, Right/Left justified. Sets alignment of 12-bit result within 16-bit field. Tied to VDD for right-justified output and tied to DGND for left-justified output. 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, EOC and EOCEN are gated by CS. If tied to DGND (asynchronous mode), SC and EOCEN are independent 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. 12/ 8 12 19 DI Twelve/eight-bit format. If tied HIGH, sets output format to 12-bit parallel. If tied LOW, sets output format to 8-bit multiplexed. No Connect 2, 4, 7, 9, 13, These pins are unused and should be connected to DGND or VDD. 16, 18, 20, 22, 24, 28, 29, 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. PIN CONFIGURATIONS DIP PACKAGE JLCC PACKAGE EOCEN OE VEE AIN AGND SC CS REFOUT REFIN BIPOFF VCC 12/ 8 SYNC DGND 13 18 1 2 28 27 5 6 7 24 23 22 3 4 26 25 8 21 920 10 19 11 12 17 16 14 15 TOP VIEW (Not to Scale) AD678 VDD EOC DB9 DB8 DB7 DB11 DB10 DB6 DB5 DB4 DB3 DB2 DB1 (R/ L) DB0 ( HBE) 6 5 4 3 2 44 43 42 41 40 18 19 20 21 22 24 25 26 27 28 23 7 8 9 10 11 12 13 14 15 16 17 39 38 37 36 35 34 33 32 31 30 29 PIN 1 IDENTIFIER TOP VIEW NC NC NC NC VEE AIN AGND REFOUT REFIN BIPOFF VCC NC NC NC DB9 DB8 DB7 DB10 DB6 DB5 DB4 DB3 AD678 NC = NO CONNECT |
Аналогичный номер детали - AD678AJ |
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Аналогичное описание - AD678AJ |
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