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MCP3909-I
(Rev.:2006)

Energy Metering IC with SPI Interface and Active Power Pulse Output

Microchip Technology 

MCP3909

Note: Unless otherwise specified, DVDD, AVDD = 5V; AGND, DGND = 0V; VREF = Internal, HPF = 1 (AC mode),

MCLK = 3.58 MHz, CH1 input = 660 mVP-P at 50 Hz, CH0 amplitude sweeps at 50 Hz.

1

0.8

0.6

0.4

0.2

0

-0.2

+25°C

-0.4

-0.6

-0.8

-1

0.0001 0.0010

0.0100

+85°C

-40°C

0.1000 1.0000

CH1 Vp-p Amplitude (V)

FIGURE 2-19:

Active Power Measurement

Error with External VREF (G = 2, PF = 0.5).

1

0.8

0.6

0.4

0.2

0

-0.2 - 40°C

-0.4

-0.6

-0.8

-1

0.0000

+85°C

+25°C

0.0001

0.0010

0.0100

CH1 Vp-p Amplitude (V)

0.1000

FIGURE 2-22:

Active Power Measurement

Error with External VREF (G = 16, PF = 1).

1

0.8

0.6

0.4

0.2

+25°C

0

-0.2

-0.4

-0.6

-0.8

-1

0.0000

-40°C

+85°C

0.0001 0.0010 0.0100

CH1 Vp-p Amplitude (V)

0.1000

FIGURE 2-20:

Active Power Measurement

Error with External VREF (G = 8, PF = 1).

1

0.8

0.6

0.4

0.2 +25°C

0

-0.2

-0.4

-0.6

-0.8

-1

0.0000

+85°C

-40°C

0.0001 0.0010 0.0100

CH1 Vp-p Amplitude (V)

0.1000

FIGURE 2-23:

Active Power Measurement

Error with External VREF (G =16, PF = 0.5).

1

0.8

0.6

0.4

0.2 +25°C

0

-0.2

-0.4

-0.6

-0.8

-1

0.0000

+85°C

-40°C

0.0001 0.0010 0.0100

CH1 Vp-p Amplitude (V)

0.1000

FIGURE 2-21:

Active Power Measurement

Error with External VREF (G = 8, PF = 0.5).

100

90

80

70

60

50

40

30

20

10

0

0.0001

SINAD (dBFS)

SINAD(dB)

0.0010 0.0100 0.1000

CH0 Vp-p Amplitude (V)

100

90

80

70

60

50

40

30

20

10

0

1.0000

FIGURE 2-24:

Signal-to-Noise and

Distortion Ratio vs. Input Signal Amplitude

(G = 1).

© 2006 Microchip Technology Inc.

DS22025A-page 11

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