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AD1674KR 数据表(PDF) 7 Page - Analog Devices |
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AD1674KR 数据表(HTML) 7 Page - Analog Devices |
7 / 12 page AD1674 REV. C –7– PIN DESCRIPTION Symbol Pin No. Type Name and Function AGND 9 P Analog Ground (Common). A0 4 DI Byte Address/Short Cycle. If a conversion is started with A0 Active LOW, a full 12-bit conversion cycle is initiated. If A0 is Active HIGH during a convert start, a shorter 8-bit conversion cycle results. During Read (R/C = 1) with 12/8 LOW, A0 = LOW enables the 8 most significant bits (DB4–DB11), and A0 = HIGH enables DB3–DB0 and sets DB7–DB4 = 0. BIP OFF 12 AI Bipolar Offset. Connect through a 50 Ω resistor to REF OUT for bipolar operation or to Analog Common for unipolar operation. CE 6 DI Chip Enable. Chip Enable is Active HIGH and is used to initiate a convert or read operation. CS 3 DI Chip Select. Chip Select is Active LOW. DB11–DB8 27–24 DO Data Bits 11 through 8. In the 12-bit format (see 12/8 and A0 pins), these pins provide the up- per 4 bits of data. In the 8-bit format, they provide the upper 4 bits when A0 is LOW and are disabled when A0 is HIGH. DB7–DB4 23–20 DO Data Bits 7 through 4. In the 12-bit format these pins provide the middle 4 bits of data. In the 8-bit format they provide the middle 4 bits when Ao is LOW and all zeroes when A0 is HIGH. DB3–DB0 19–16 DO Data Bits 3 through 0. In the 12-bit format these pins provide the lower 4 bits of data. In the 8-bit format these pins provide the lower 4 bits of data when A0 is HIGH, they are disabled when A0 is LOW. DGND 15 P Digital Ground (Common). REF OUT 8 AO +10 V Reference Output. R/C 5 DI Read/Convert. In the full control mode R/C is Active HIGH for a read operation and Active LOW for a convert operation. In the stand-alone mode, the falling edge of R/C initiates a conversion. REF IN 10 AI Reference Input is connected through a 50 Ω resistor to +10 V Reference for normal operation. STS 28 DO Status is Active HIGH when a conversion is in progress and goes LOW when the conversion is completed. VCC 7 P +12 V/+15 V Analog Supply. VEE 11 P –12 V/–15 V Analog Supply. VLOGIC 1 P +5 V Logic Supply. 10 VIN 13 AI 10 V Span Input, 0 V to +10 V unipolar mode or –5 V to +5 V bipolar mode. When using the AD1674 in the 20 V Span 10 VIN should not be connected. 20 VIN 14 AI 20 V Span Input, 0 V to +20 V unipolar mode or –10 V to +10 V bipolar mode. When using the AD1674 in the 10 V Span 20 VIN should not be connected. 12/8 2 DI The 12/8 pin determines whether the digital output data is to be organized as two 8-bit words (12/8 LOW) or a single 12-bit word (12/8 HIGH). TYPE: AI = Analog Input AO = Analog Output DI = Digital Input DO = Digital Output P = Power FUNCTIONAL BLOCK DIAGRAM REF OUT SHA COMP 20k 10k 5k 2.5k 2.5k 5k 12 12 AD1674 AGND BIP OFF REF IN 20V IN 10V IN IDAC 12 CONTROL CE 12/8 CS R/C A 0 5k 10k SAR CLOCK 10V REF DAC STS DB11 (MSB) DB0 (LSB) PIN CONFIGURATION TOP VIEW (Not to Scale) AD1674 18 28 27 24 23 22 26 25 21 20 19 17 16 15 13 1 2 5 6 7 3 4 8 9 10 12 14 VLOGIC CE VCC A0 REF OUT AGND REF IN VEE BIP OFF 10VIN 20VIN CS 12/8 R/C STS DB11(MSB) DB8 DB7 DB6 DB10 DB9 DB5 DB4 DB3 DB2 DB1 DB0(LSB) DGND 11 |
类似零件编号 - AD1674KR |
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类似说明 - AD1674KR |
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