Datasheet

 2006-2012 Microchip Technology Inc. DS22025C-page 3
MCP3909
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings †
V
DD
...................................................................................7.0V
Digital inputs and outputs w.r.t. A
GND
....... -0.6V to V
DD
+0.6V
Analog input w.r.t. A
GND
.........................................-6V to +6V
V
REF
input w.r.t. A
GND
.............................. -0.6V to V
DD
+0.6V
Storage temperature .....................................-65°C to +150°C
Ambient temp. with power applied ................-65°C to +125°C
Soldering temperature of leads (10 seconds) ............. +300°C
ESD on the analog inputs (HBM,MM) .................5.0 kV, 500V
ESD on all other pins (HBM,MM) ........................5.0 kV, 500V
† Notice: Stresses above those listed under "Maximum Rat-
ings" may cause permanent damage to the device. This is a
stress rating only and functional operation of the device at
those or any other conditions above those indicated in the
operation listings of this specification is not implied. Exposure
to maximum rating conditions for extended periods may affect
device reliability.
ELECTRICAL CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, all parameters apply at AV
DD
= DV
DD
= 4.5V to 5.5V,
Internal V
REF
, HPF turned on (AC mode), A
GND
, D
GND
= 0V, MCLK = 3.58 MHz; T
A
= -40°C to +85°C.
Parameter Sym Min Typ. Max Units Comment
Active Power Measurement Accuracy
Active Energy Measurement
Error
E—0.1—% F
OUT
Channel 0 swings 1000:1 range,
F
OUT0
, F
OUT1
Frequency outputs
only, does not apply to serial
interface data. (Note 1, Note 4)
No-Load Threshold/
Minimum Load
NLT — 0.0015 — % F
OUT
Max
Frequency outputs only, does not
apply to serial interface data.
Disabled when F2, F1, F0 = 0, 1, 1
(Note 5, Note 6)
System Gain Error — 1 5 % F
OUT
(Note 2, Note 5)
AC Power Supply Rejection
(output frequency variation)
AC PSRR — 0.01 — % F
OUT
F2, F1, F0 = 0, 1, 1 (Note 3)
DC Power Supply Rejection
(output frequency variation)
DC PSRR — 0.01 — % F
OUT
HPF = 1, Gain = 1 (Note 3)
Waveform Sampling
A/D Converter Signal-to-
Noise and Distortion Ratio
SINAD — 81 — dB Applies to both channels,
V
IN
= 0 dBFS at 50 Hz
(V
IN
= Full Scale)
Bandwidth
(Notch Frequency)
— 14 — kHz Applies to both channels,
MCLK/256
Phase Delay Between
Channels
— — 1/MCLK s HPF = 0 and 1, < 1 MCLK period
(Note 4, Note 6, Note 7)
Note 1: Measurement error = (Energy Measured By Device - True Energy)/True Energy * 100%. Accuracy is mea-
sured with signal (±660 mV) on Channel 1. F
OUT0
, F
OUT1
pulse outputs. Valid from 45 Hz to 75 Hz. See
typical performance curves for higher frequencies and increased dynamic range. This parameter is not
100% production tested.
2: Does not include internal V
REF
. Gain = 1, CH0 = 470 mVDC, CH1 = 660 mVDC, difference between
measured output frequency and expected transfer function.
3: Percent of HF
OUT
output frequency variation; Includes external V
REF
= 2.5V, CH1 = 100 mV
RMS
@ 50 Hz,
CH2 = 100 mV
RMS
@ 50 Hz, AV
DD
= 5V + 1 V
pp
@ 100 Hz. DC PSRR: 5V ±500 mV
4: Error applies down to 60 degree lead (PF = 0.5 capacitive) and 60 degree lag (PF = 0.5 inductive).
5: Refer to Section 4.0 “Device Overview” for complete description.
6: Specified by characterization, not production tested.
7: 1 MCLK period at 3.58 MHz is equivalent to less than < 0.005 degrees at 50 or 60 Hz.