Datasheet
6 ______________________________________________________________________________________
MAX11201
24-Bit, Single-Channel, Ultra-Low-Power, Delta
Sigma ADC with 2-Wire Serial Interface
Typical Operating Characteristics (continued)
(V
AVDD
= 3.6V, V
DVDD
= 1.8V, V
REFP
- V
REFN
= AVDD; internal clock; T
A
= T
MIN
to T
MAX
, unless otherwise specified. Typical values
are at T
A
=
+25NC.)
INTERNAL OSCILLATOR FREQUENCY
vs. AVDD VOLTAGE
MAX11201 toc10
AVDD VOLTAGE (V)
FREQUENCY (MHz)
3.453.303.153.002.85
2.2
2.3
2.4
2.5
2.6
2.1
2.70 3.60
MAX11201A
MAX11201B
NOISE vs. INPUT VOLTAGE
MAX11201 toc11
INPUT VOLTAGE (V)
NOISE (µV
RMS
)
2.01.5-2.0 -1.5 -1.0 0 0.5-0.5 1.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0
-2.5 2.5
V
REF
= 2.5V
MAX11201A
MAX11201B
NOISE vs. TEMPERATURE
MAX11201 toc12
TEMPERATURE (°C)
NOISE (µV
RMS
)
7555-25 -5 15 35
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0
-45 95
V
REF
= 3.0V
MAX11201A
MAX11201B
NOISE HISTOGRAM
(MAX11201A, 120sps)
MAX11201 toc13
ADC OUTPUT (µV)
NUMBER OF READINGS (%)
9.06.74.32.0-0.3
2
4
6
8
10
12
14
0
-2.7 11.3
30,000 CONSECUTIVE READINGS
T
A
= +25°C
V
REF
= 2.5V
RMS = 2.1µV
MEAN = 5.0µV
ADC OUTPUT (µV)
NUMBER OF READINGS (%)
6.295.443.74 4.592.892.041.19
NOISE HISTOGRAM
(MAX11201B, 13.75sps)
2
4
6
8
10
12
14
16
18
20
0
MAX11201 toc14
30,000 CONSECUTIVE READINGS
T
A
= +25°C
V
REF
= 2.5V
RMS = 0.72µV
MEAN = 4.1µV
LONG-TERM ADC READINGS
(MAX11201A)
MAX11201 toc15
TIME (MINUTES)
ADC READING (µV)
0.80.60.40.2
-10
-5
0
5
10
15
-15
0 1.0
T
A
= +25°C
V
IN
= 0V
RMS = 2.1µV
LONG-TERM ADC READINGS
(MAX11201B)
MAX11201 toc16
TIME (MINUTES)
ADC READING (µV)
8642
-4
-3
-2
-1
0
1
2
3
4
5
-5
0 10
T
A
= +25°C
V
IN
= 0V
RMS = 0.70µV
OFFSET ERROR vs. V
REF
MAX11201 toc17
V
REF
(V)
OFFSET ERROR (ppmFSR)
3.53.02.52.01.5
-0.5
0
0.5
1.0
1.5
2.0
-1.0
1.0 4.0
V
REF
= V
REFP
- V
REFN
T
A
= +85°C
T
A
= +25°C
T
A
= -45°C
OFFSET ERROR vs. TEMPERATURE
MAX11201 toc18
TEMPERATURE (°C)
OFFSET ERROR (ppmFSR)
75553515-5-25
0.5
1.0
1.5
2.0
2.5
0
-45 95
CALIBRATED AT +25°C