Datasheet
2012-2013 Microchip Technology Inc. DS20002286B-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, 300V
ESD on all other pins (HBM,MM) ........................ 4.0 kV, 300V
† Notice: Stresses above those listed under “Absolute
Maximum 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 indicated 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
=1.2V
PP
= 424 mV
RMS
at 50/60 Hz on both channels.
Characteristic Sym Min Typ Max Units Conditions
ADC Performance
Resolution (No Missing
Codes)
24 — — bits OSR = 256 or greater
Sampling Frequency f
S
(DMCLK) — 1 4 MHz For maximum condition,
BOOST<1:0> = 11
Output Data Rate f
D
(DRCLK) — 4 125 ksps For maximum condition,
BOOST<1:0> = 11,
OSR = 32
Analog Input
Absolute Voltage on
CH0+, CH0-, CH1+,
CH1- pins
CH0+/- -1 +1 V All analog input channels,
measured to A
GND
Analog Input
Leakage Current
I
IN
— ±1 — nA RESET<1:0> = 11,
MCLK running continuously
Differential Input
Voltage Range
(CH
n+
-CH
n-
) -600/GAIN — +600/
GAIN
mV V
REF
=1.2V,
proportional to V
REF
Offset Error V
OS
-1 0.2 +1 mV Note 4
Offset Error Drift — 0.5 — µV/°C
Gain Error GE -4 — +4 % Note 4
Gain Error Drift — 1 — ppm/°C
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
=1.2V
PP
= 424mV
RMS
, V
REF
= 1.2V at 50/60 Hz. See Section 4.0, Terminologies And Formulas 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 Section 2.0, Typical Performance
Curves for typical performance.
5: Outside of this range, the 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 optimizing ADC accuracy, AMCLK should be limited to the maximum frequency defined in
Ta b le 5- 2 as a function of the BOOST and PGA settings chosen. MCLK can take larger values as long as the prescaler
settings (PRE<1:0>) limit AMCLK = MCLK/PRESCALE in the defined range in Ta ble 5 -2 .