19
4.6
Microchip ADC (MCP3903)
The Microchip MCP3903 is a six-channel Analog Front End (AFE) containing three pairs made
out of two synchronous sampling Delta-Sigma Analog-to-Digital Converters (ADC) with PGA, a
phase delay compensation block, internal voltage reference, and high-speed 10 MHz SPI
compatible serial interface. The converters contain a proprietary dithering algorithm for
reduced idle tones and improved THD.
The following figure shows the A/D Converter interface.
Figure 12 - ADC Interface
4.7
Programming
The PolarFire device is programmed using the on-board FlashPro5 programmer. For more
information about how to program the device, see Appendix: Programming PolarFire FPGA
Using the On-Board FlashPro5, page 29.
4.7.1
FTDI
The key features of the FT4232HL chip are:
USB 2.0 high-speed (480 Mbps) to UART/MPSSE IC
Single-chip USB-to-quad serial ports in various configurations
Entire USB protocol handled on the chip without requiring USB-specific firmware
programming
USB 2.0 high-speed (480 Mbps) and full-speed (12 Mbps) compatibility
Two multi-protocol synchronous serial engines (MPSSE) on channel A and channel B to
simplify synchronous serial protocol (USB to JTAG, I2C, SPI, or bit-bang) design
Note
: FTDI chip requires 1.8 V chip core voltage and +3.3 V I/O voltage
PolarFire FPGA
GPIO – Bank 2
MCP3903 ADC
Controls
SDI
SDO
SCK
Arduino
J6
Channels
0 to 5
Mikro
J8
Channel 0
