Datasheet
MCP3909
DS22025C-page 4 2006-2012 Microchip Technology Inc.
ADC/PGA Specifications
Offset Error V
OS
— 2 5 mV Referred to Input, applies to both
channels
Gain Error Match — 0.5 — % F
OUT
(Note 5)
Internal Voltage Reference
Voltage — 2.4 — V
To le ra nc e — ±2 — %
Tempco — 15 — ppm/°C
Reference Input
Input Range 2.2 — 2.6 V
Input Impedance 3.2 — — kΩ
Input Capacitance — — 10 pF
Analog Inputs
Maximum Signal Level — — ±1 V CH0+,CH0-,CH1+,CH1- to A
GND
Differential Input Voltage
Range Channel 0
— — ±470/G mV G = PGA Gain on Channel 0
Differential Input Voltage
Range Channel 1
——±660mV
Input Impedance 390 — — kΩ Proportional to 1/MCLK
Oscillator Input
Frequency Range MCLK 1 — 4 MHz
Power Specifications
Operating Voltage 4.5 — 5.5 V AV
DD,
DV
DD
I
DD,A
I
DD,A
—2.3 2.8 mAAV
DD
pin only
I
DD,D
I
DD,D
—0.8 1.2 mADV
DD
pin only
ELECTRICAL CHARACTERISTICS (CONTINUED)
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
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.