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ADC674ASH Datasheet(PDF) 4 Page - Burr-Brown (TI) |
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ADC674ASH Datasheet(HTML) 4 Page - Burr-Brown (TI) |
4 / 6 page 4 ® ADC674A PIN CONFIGURATION PIN DESIGNATION DEFINITION FUNCTION CE (Pin 6) Chip Enable Must be high (“1”) to either initiate a conversion or read output data. 0-1 edge may be used to initiate a (active high) conversion. CS (Pin 3) Chip Select Must be low (“0”) ot either initiate a conversion or read output data. 1-0 edge may be used to initiate a conversion. (active low) R/C (Pin 5) Read/Convert Must be low (“0”) to initiate either 8- or 12-bit conversions. 1-0 edge may be used to initiate a conversion. Must be high (“1” = read) (“1”) to read output data. 0-1 edge may be used to initiate a read operation. (“0” = convert) AO (Pin 4) Byte Address In the start-convert mode, AO selects 8-bit (A O = “1”) or 12-bit (AO = “0”) conversion mode. When reading output Short Cycle data in two 8-bit bytes, AO = “0” accesses ±8MSBs (high byte) and AO = “1” accesses 4LSBs and trailing “0s” (low byte). 12/8 (Pin 2) Data Mode Select When reading output data. 12/8 = “1” enables all 12 output bits simultaneously. 12/8 = “0” will enable the MSBs (“1” = 12-bits) or LSBs as determined by the AO line. (“0” = 8-bits) TABLE I. ADC674A Control Line Functions. CONTROLLING THE ADC674A The Burr-Brown ADC674A can be easily interfaced to most microprocessor systems and other digital systems. The mi- croprocessor may take full control of each conversion, or the converter may operate in a stand-alone mode, controlled only by the R/C input. Full control consists of selecting an 8- or 112-bit conversion cycle, initiating the conversion, and the output data when ready—choosing either 12 bits all at once, or 8 bits followed by 4 bits in a left-justified format. The five control inputs (12/8, CS, A O, R/C, and CE) are all TTL-/CMOS-compatible. The functions of the control in- puts are described in Table I. The control function truth table is listed in Table II. CE CS R/C 12/8 AO OPERATION 0 X X X X None X 1 X X X None ↑ 0 0 X 0 Initiate 12-bit conversion ↑ 0 0 X 1 Initiate 8-bit conversion 1 ↓ 0 X 0 Initiate 12-bit conversion 1 ↓ 0 X 1 Initiate 8-bit conversion 10 ↓ X 0 Initiate 12-bit conversion 10 ↓ X 1 Initiate 8-bit conversion 1 0 1 1 X Enable 12-bit output 1 0 1 0 0 Enable 8 MSBs only 1 0 1 0 1 Enable 4 LSBs plus 4 trailing zeros TABLE II. Control Input Truth Table. +5VDC Supply (V ) 12/8 CS A R/C CE +V Ref Out Analog Common Ref In V Bipolar Offset 10V Range 20V Range Status DB11 (MSB) DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 (LSB) Digital Common 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 LOGIC CC EE 5k Ω 10k Ω 10V Reference 12-Bit D/A Converter Control Logic Power-up Reset Clock 12 Bits Comparator 12 Bits O 5k Ω |
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