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ADC574AKP Arkusz danych(PDF) 7 Page - Burr-Brown (TI) |
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ADC574AKP Arkusz danych(HTML) 7 Page - Burr-Brown (TI) |
7 / 10 page 7 ® ADC574A 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 conversion. (active high) CS (Pin 3) Chip Select Must be low (“0”) to 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. (“1” = read) Must be high (“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 (AO = “1”) or 12-bit (AO = "0") conversion mode. When reading output data Short Cycle in two 8-bit bytes, AO = “0” accesses 8 MSBs (high byte) and AO = “1” accesses 4 LSBs 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) Comparator 100 Ω 10V Range Analog Input Analog Common Full-Scale Adjust Ref In Ref Out Bipolar Offset ADC574A 10 8 12 13 14 9 20V Range Bipolar Offset Adjust R 1 100Ω R 2 TABLE II. ADC574A Control Line Functions. FIGURE 3. Bipolar Configuration. FIGURE 2. Unipolar Configuration. for the 20V range) that causes the output code to be DB0 ON (high). Adjust potentiometer R1 until DB0 is alternately toggling ON and OFF with all other bits OFF. Then adjust full scale by applying an input voltage of nominal full-scale value minus 3/2LSB, the value which should cause all bits to be ON. This value is +9.9963V for the 10V range and +19.9927V for the 20V range. Adjust potentiometer R2 until bits DB1-DB11 are ON and DB0 is toggling ON and OFF. CALIBRATION PROCEDURE—BIPOLAR RANGES If external adjustments of full-scale and bipolar offset are not required, the potentiometers may be replaced by 50 Ω, 1% metal-film resistors. If adjustments are required, connect the converter as shown in Figure 3. The calibration procedure is similar to that described above for unipolar operation, except that the offset adjustment is performed with an input voltage which is 1/2LSB above the minus full-scale value (–4.9988V for the ±5V range, –9.9976V for the ±10V range). Adjust R 1 for DB0 to toggle ON and OFF with all other bits OFF. To adjust full-scale, apply a DC input signal which is 3/2LSB below the nominal plus full-scale value (+4.9963V for ±5V range, +9.9927V for ±10V range) and adjust R 2 for DB0 to toggle ON and OFF with all other bits ON. CONTROLLING THE ADC574A The Burr-Brown ADC574A 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 12-bit conversion cycle, initiating the conversion, and reading 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, AO, R/C, and CE) are all TTL/CMOS-compatible. The functions of the control inputs are described in Table II. The control function truth table is listed in Table III. Comparator 100 Ω 100 Ω Analog Common 100k Ω 100k Ω +V CC –V CC R 1 Unipolar Offset Adjust Full-Scale Adjust Ref In Ref Out Bipolar Offset ADC574A 10 8 12 13 14 9 10V Range Analog Input 20V Range R 2 |
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