MCP3909EV-MCU16 Microchip Technology, MCP3909EV-MCU16 Datasheet - Page 20

• Manufacturer Part Number: MCP3909EV-MCU16
• Description: EVALUATION BOARD FOR MCP3909
• Manufacturer: Microchip Technology

Specifications of MCP3909EV-MCU16

• Number Of Adc's: 2
• Number Of Bits: 16
• Sampling Rate (per Second): 15k
• Data Interface: Serial
• Inputs Per Adc: 1 Differential
• Input Range: ±1 V
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: MCP3909
• Silicon Manufacturer: Microchip
• Application Sub Type: ADC
• Kit Application Type: Data Converter
• Silicon Core Number: MCP3909
• Kit Contents: Board
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

MCP3909 / dsPIC33F 3-Phase Energy Meter Reference Design
2.3
FIGURE 2-3:
DS51723A-page 20
SDO DR
ANALOG-TO-DIGITAL CONVERSION
Phase A,B,C I & V Data
3.3768 MHz (50 Hz Version)
This meter design uses Microchip's MCP3909 energy meter ICs. Small-signal current
inputs can be amplified by the programmable gain amplifier inside the MCP3909
device. The programmable range for the MCP3909's PGA is 16:1 V/V. The MCP3909
PGA gain can be configured by G0 and G1 (Pin 15 and 16 of the dsPIC33F).
The MCP3909 device's clock is provided by a 3.3768 MHz active crystal (for 50 Hz
system, see Appendix D. “50/60 Hz Meter Operation” for 60 Hz line frequency
information). The MCP3909 device's output data rate is 12.8 ksps. The clock lines and
MCLR lines of all 3 MCP3909 devices are connected together, which ensures that the
3 phases are strictly synchronous.
Clock Generation, Sampling Times and Calculation Frequencies.
x 6 ADCs
16 bits
t
MCP3909
LINE_CYC
f
f
f
SAMPLE3
SAMPLE1
SAMPLE2
t
SAMPLE
= 3.2 ksps (Harmonic Analysis, Distortion)
= 12.8 ksps (Active Power)
= 6.4 ksps (Reactive Power, RMS Current / Voltage)
X100
MCP3909
MCLK input
DR
MCP3909
DR Pulse
© 2009 Microchip Technology Inc.
(Input Capture)
To dsPIC33F
IRQ IC1