ADM00310 Microchip Technology, ADM00310 Datasheet - Page 12

• Manufacturer Part Number: ADM00310
• Description: BOARD EVAL FOR MCP3903 AFE
• Manufacturer: Microchip Technology
• Series: -r

Specifications of ADM00310

• Design Resources: MCP3903 Eval Brd BOM MCP3903 Eval Brd Schematic
• Main Purpose: Interface, Analog Front End (AFE)
• Embedded: Yes, MCU, 16-Bit
• Utilized Ic / Part: MCP3903, PIC24F, PIC24H, dsPIC33, MCP2200
• Primary Attributes: -
• Secondary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

MCP3903 ADC Evaluation Board for 16-Bit MCUs User’s Guide
DS51994A-page 8
1.2.1
The MCP3903 ADC Evaluation Board for 16-Bit MCUs is populated with a 3.58 MHz
crystal, being used as a clock source, by placing jumpers in the following position on
the MCP3903 Digital I/O header block:
FIGURE 1-3:
1.2.2
The PIC
setting the ADC sample rate through the use of the output compare module OC1. To
use this, make the following jumper change to the MCP3903 Digital I/O header block:
FIGURE 1-4:
The signal frequency from OC1 can be changed by the user from the PC software by
changing the value in the Sampling Speed Control box from the Edit menu. A low
number will generate a high frequency signal. The value of the sampling rate, which is
directly proportional to the clock frequency from OC1, is indicated in the sampling
speed indicator box in the PC software (see Figure 2-3) for the dsPIC33 example. In
the PIC24F example, the sampling speed is constant at 4.8 ksps, regardless of the
OSR value.
®
MCU can be used to generate the CLKIN (MCLK) signal for the MCP3903,
Using the Crystal X2
Driving the Clock with the PIM Module
CLKOUT
CLKOUT
CLKIN
CLKIN
CLKIN
CLKIN
ADC Clock Selection Jumpers - External Crystal.
ADC Clock Selection Jumpers - Clock from MCU.
XTAL
XTAL
XTAL
XTAL
PIM OC1
PIM OC1
© 2011 Microchip Technology Inc.