27 Current Bias Generator (CBG)

Note:
  1. This data sheet summarizes the features of the dsPIC33CDVL256MC506 family of devices. It is not intended to be a comprehensive reference source. To complement the information in this data sheet, refer to “Current Bias Generator (CBG)” (www.microchip.com/DS70005253) in the “dsPIC33/PIC24 Family Reference Manual”.

The Current Bias Generator (CBG) consists of two classes of current sources: 10 μA and 50 μA sources. The major features of each current source are:

  • 10 μA Current Sources:
    • Current sourcing only
    • Up to four independent sources
  • 50 μA Current Sources:
    • Selectable current sourcing or sinking
    • Selectable current mirroring for sourcing and sinking
Table 27-1. CBG Channel Availability
Package TypeISRCxIBIASx
64-pin0, 1, 2, 30, 1, 2, 3

A simplified block diagram of the CBG module is shown in Figure 27-1.

Figure 27-1. Constant-Current Source Module Block Diagram(2)
Note:
  1. RESD is typically 350 Ohms.
  2. The ADC analog input is shown only for clarity. Each analog peripheral connected to the pin has a separate Electrostatic Discharge (ESD) resistor.