Datasheet
© 2012 Microchip Technology Inc. DS22286A-page 3
MCP3911
1.0 ELECTRICAL
CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS †
V
DD
.....................................................................-0.3V to 4.0V
Digital inputs and outputs w.r.t. A
GND
................--0.3V to 4.0V
Analog input w.r.t. A
GND
.........................................-2V to +2V
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).................4.0 kV, 200V
ESD on all other pins (HBM,MM)........................4.0 kV, 200V
† Notice: Stresses above those listed under “Absolute Maxi-
mum Ratings” 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 indi-
cated in the operational listings of this specification, is not
implied. Exposure to maximum rating conditions for extended
periods may affect device reliability.
1.1 ELECTRICAL SPECIFICATIONS
TABLE 1-1: ANALOG SPECIFICATIONS TARGET TABLE
Electrical Specifications: Unless otherwise indicated, all parameters apply at AV
DD
=
DV
DD
= 2.7V to 3.6V, MCLK =
4 MHz; PRE<1:0> = 00; OSR = 256; GAIN = 1; VREFEXT=0, CLKEXT=1, AZ_FREQ=0, DITHER<1:0>=11,
BOOST<1:0> = 10; V
CM
=0V; T
A
= -40°C to +125°C; V
IN
= 1.2 V
PP
= 424 mV
RMS
@ 50/60 Hz on both channels.
Sym Characteristic Min Typ Max Units Test Conditions
ADC Performance
Resolution (No Missing
Codes)
24 -- -- bits OSR = 256 or greater
f
S
(DMCLK) Sampling Frequency 1 4 MHz For maximum condi-
tion, BOOST<1:0> = 11
f
D
(DRCLK) Output Data Rate 4 125 ksps For maximum condi-
tion, BOOST<1:0> = 11,
OSR = 32
CH0+/- Analog Input Absolute Voltage
on CH0+, CH0-, CH1+, CH1-
pins
-1 +1 V All analog input
channels, measured to
AGND
I
IN
Analog Input Leakage Current +/-1 nA RESET<1:0>=11, MCLK
running continuously
(CH
n+
-CH
n-
) Differential Input Voltage
Range
-600/GAIN +600/ GAIN mV V
REF
=1.2V,
proportional to V
REF
V
OS
Offset Error -1 0.2 +1 mV (Note 4)
Offset Error Drift 0.5 µV/°C
GE Gain Error -4 +4 % (Note 4)
Note 1:
This specification implies that the ADC output is valid over this entire differential range and that there is no distortion or
instability across this input range. Dynamic Performance specified at -0.5 dB below the maximum signal range, V
IN
=
1.2VPP = 424 mV
RMS
, V
REF
= 1.2V @ 50/60 Hz. See terminology section for definition. This parameter is established
by characterization and not 100% tested. See performance graphs for other than default settings provided here.
2: For these operating currents the following configuration bit settings apply: SHUTDOWN<1:0>=00, RESET<1:0>=00,
VREFEXT=0, CLKEXT=0.
3: For these operating currents the following configuration bit settings apply: SHUTDOWN<1:0>=11, VREFEXT=1,
CLKEXT=1.
4: Applies to all gains. Offset and gain errors depend on PGA gain setting, see typical performance curves for typical per-
formance.
5: Outside of this range, ADC accuracy is not specified. An extended input range of +/-2 V can be applied continuously to
the part with no damage.
6: For proper operation, and for optimizing ADC accuracy, AMCLK should be limited to the maximum frequency defined in
the Table 5-2 as a function of the BOOST and PGA setting chosen. MCLK can take larger values as long as the pres-
caler settings (PRE<1:0>) limit AMCLK=MCLK/PRESCALE in the defined range in the Table 5-2.