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ADS7800KUE4 Arkusz danych(PDF) 11 Page - Texas Instruments |
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ADS7800KUE4 Arkusz danych(HTML) 11 Page - Texas Instruments |
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11 / 20 page  ADS7800 11 SBAS001A www.ti.com INPUT VOLTAGE RANGE AND LSB VALUES Input Voltage Range Defined As: ±10V ±5V Analog Input Connected to Pin 1 2 Pin Connected to GND 21 One Least Significant Bit (LSB) FSR/212 20V/212 10V/212 4.88mV 2.44mV OUTPUT TRANSITION VALUES FFEH to FFFH +Full Scale +10V–3/2LSB +5V–3/2LSB +9.9927V +4.9963V 7FFH to 800H Mid Scale 0V–1/2LSB 0V–1/2LSB (Bipolar Zero) –2.44mV –1.22mV 000H to 001H –Full Scale –10V+1/2LSB –5V+1/2LSB –9.9976V –4.9988V TABLE IV. Input Voltages, Transition Values, and LSB Values. Next, although the data outputs are forced into a Hi-Z state during conversion, fast bus transients can still be capaci- tively coupled into the ADS7800. If the data bus experiences fast transients during conversion, these transients can be attenuated by adding a logic buffer to the data outputs. The BUSY output can be used to enable the buffer. Naturally, transients on the analog input signal are to be avoided, especially at times within ±20ns of R/C going LOW, when they may be trapped as part of the charge on the capacitor array. This requires careful layout of the circuit in front of the ADS7800. Finally, in multiplexed systems, the timing on when the multiplexer is switched may affect the analog performance of the system. In most applications, the multiplexer can be switched as soon as R/C goes LOW (with appropriate delays), but this may affect the conversion if the switched signal shows glitches or significant ringing at the ADS7800 input. Whenever possible, it is safer to wait until the conversion is completed before switching the multiplexer. The extremely fast acquisition time and conversion time of the ADS7800 make this practical in many applications. |
Podobny numer części - ADS7800KUE4 |
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Podobny opis - ADS7800KUE4 |
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