Texas Instruments ADS1174EVM, Руководство пользователя, Страница: 26 / 48

10.1.2 Settings Tab
Evaluating Performance with the ADCPro Software
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The ADS1274 requires a clock to operate. The maximum frequency is selected for the different operating
modes, as shown in
Table 7 .
Table 7. Operating Modes: Clock Frequency
Operating Mode CLKDIV Frequency (MHz)
High-Speed 32.768
High-Resolution 27
Low-Power 1 27
Low-Power 0 13.5
Low-Speed 1 27
Low-Speed 0 5.4
If the PLL is selected as the clock source, a frequency can be entered in the Clock Frequency box; the
software will find the closest frequency that is possible for the PLL to synthesize (and which is within the
maximum allowable frequency for the mode selected) and will set the clock to that frequency, as well as
display the actual frequency used in the
Clock Frequency box once focus has moved from that control.
Figure 28. Clock Settings and Mode
The Operating Mode control (illustrated in Figure 29 ) can select from High-Speed, High-Resolution,
Low-Power, or Low-Speed.
Figure 29. Operating Mode
26 ADS1174EVM, ADS1274EVM, ADS1174EVM-PDK, and ADS1274EVM-PDK SBAU134A – August 2008 – Revised May 2009
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