Datasheet

 2012-2013 Microchip Technology Inc. DS20002286B-page 5
MCP3911
Internal Voltage Reference
Tol er an ce V
REF
1.176 1.2 1.224 V VREFEXT = 0,
T
A
= +25°C only
Temperature Coefficient TCV
REF
— 7 — ppm/°C T
A
= -40°C to +125°C,
VREFEXT = 0
Output Impedance ZOUTV
REF
— 2 — kW VREFEXT = 0
Internal Voltage Refer-
ence Operating Current
AI
DD
V
REF
— 25 — µA VREFEXT = 0,
SHUTDOWN<1:0> = 11
Voltage Reference Input
Input Capacitance — — 10 pF
Differential Input Voltage
Range (V
REF
+ – V
REF
-)
V
REF
1.1 — 1.3 V VREFEXT = 1
Absolute Voltage on
REFIN+ pin
V
REF+
V
REF
-+1.1 —V
REF
-
+1.3
V VREFEXT = 1
Absolute Voltage on
REFIN- pin
V
REF-
-0.1 — +0.1 V REFIN- should be connected
to A
GND
when VREFEXT = 0
Master Clock Input
Master Clock Input
Frequency Range
f
MCLK
— 20 MHz CLKEXT = 1, Note 6
Crystal Oscillator
Operating Frequency
Range
f
XTAL
1 — 20 MHz CLKEXT = 0, Note 6
Analog Master Clock AMCLK — — 16 MHz Note 6
Power Supply
Operating Voltage, Ana-
log
AV
DD
2.7 — 3.6 V
Operating Voltage, Digital DV
DD
2.7 — 3.6 V
Operating Current,
Analog (Note 2)
I
DD,A
— 1.5 2.3 mA BOOST<1:0> = 00
— 1.8 2.8 mA BOOST<1:0> = 01
— 2.5 3.5 mA BOOST<1:0> = 10
— 4.4 6.25 mA BOOST<1:0> = 11
TABLE 1-1: ANALOG SPECIFICATIONS TARGET TABLE (CONTINUED)
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
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 .