Texas Instruments PGA2500EVMV2, Руководство пользователя

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Figure 1-2. PGA2500EVMV2 GUI
A 16-bit control word is utilized to program these functions; see Figure 1-3 .
Figure 1-3. PGA2500 16-bit Control
The differential analog output of the PGA2500 is constantly monitored by a DC servo amplifier loop. The purpose
of the servo loop is to minimize the DC offset voltage present at the analog outputs by feeding back an error
signal to the input stage of the programmable gain amplifier. The error signal is then used to correct the offset.
The DC servo may be enabled by checking the
DC Servo checkbox in the GUI. To disable this function, leave
the DC Servo checkbox in the GUI unchecked.
Two external capacitors are required for the DC servo function, with one capacitor connected between CS11
and CS12 (pins 24 and 23), and the second capacitor connected between CS21 and CS22 (pins 22 and
21). Capacitor values up to 4.7 µF may be utilized. However, larger valued capacitors will result in longer
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PGA2500EVMV2 Evaluation Module 3
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