REF5025ID datasheet(26/48 Pages) TI1

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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

Low-Power

13.5

Low-Speed

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

ADS1174EVM, ADS1274EVM, ADS1174EVM-PDK, and ADS1274EVM-PDK

SBAU134A – August 2008 – Revised May 2009

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REF5025ID Datasheet(PDF) 26 Page - Texas Instruments