AN239 - Expanding ADC1 Dyanmic Range
www.DataSheet4U.com AN239 E X PA N D I N G ADC1 D Y N A M I C R A N G E F O R T H E Si8250 1.
Introduction The Si8250 data sheet specifies a common mode input range of 0.6 to 1.2 V for ADC1.
This range effectively limits the dynamic voltage output range in voltage-controlled converters.
For example, the output range for a 3.3 V power supply designed to generate a 1.00 V sense would have an absolute maximum dynamic range of 1.98 to 3.96 V.
In reality, the active regulation point would need to b
AN239 Features
* SB. The ADC resolution is set at 4 mV. These settings yield a sense voltage range of 0.664 to 1.072 V. The high-side resistor, Rs, is specified to be 7500 Ω. The results are easily calculated with a spreadsheet and are shown in Figure 7. The resulting circuit is shown in Figure 8. Parameter Vout(min
