MAX11202_12 Datasheet, PDF (6/14 Pages) Maxim Integrated Products – 24-Bit, Single-Channel, Ultra-Low-Power, Delta Sigma ADC with 2-Wire Serial Interface

MAX11202
24-Bit, Single-Channel, Ultra-Low-Power, Delta
Sigma ADC with 2-Wire Serial Interface
Typical Operating Characteristics (continued)
(VAVDD = 3.6V, VDVDD = 1.8V, VREFP - VREFN = AVDD; internal clock; TA = TMIN to TMAX, unless otherwise specified. Typical values
are at TA = +25NC.)
INTERNAL OSCILLATOR FREQUENCY
vs. AVDD VOLTAGE
2.6
VDVDD = 1.8V
2.5
MAX11202A
2.4
2.3
MAX11202B
2.2
2.1
2.70 2.85 3.00 3.15 3.30 3.45 3.60
AVDD VOLTAGE (V)
NOISE HISTOGRAM
(MAX11202A, 120sps)
14
30,000 CONSECUTIVE READINGS
12
TA = +25°C
10 VREF = 2.5V
RMS = 2.1µV
8 ^{MEAN = 5.0µV}
6
4
2
0
-2.7 -0.3 2.0 4.3 6.7 9.0 11.3
ADC OUTPUT (µV)
LONG-TERM ADC READINGS
(MAX11202B)
5
TA = +25°C
4 _{VIN = 0V}
3 ^{RMS = 0.72µV}
2
1
0
-1
-2
-3
-4
-5
0
2
4
6
8
10
TIME (min)
6  
NOISE vs. INPUT VOLTAGE
4.0
VREF = 2.5V
3.5
3.0
MAX11202A
2.5
2.0
1.5
1.0
MAX11202B
0.5
0
-2.5 -2.0 -1.5 -1.0 -0.5 0 0.5 1.0 1.5 2.0 2.5
INPUT VOLTAGE (V)
NOISE HISTOGRAM
(MAX11202B, 13.75sps)
20
18 ^{30,000 CONSECUTIVE READINGS}
16 _{TA = +25°C}
14 ^{VREF = 2.5V}
RMS = 0.72µV
12 _{MEAN = 4.1µV}
10
8
6
4
2
0
1.19 2.04 2.89 3.74 4.59 5.44 6.29
ADC OUTPUT (µV)
OFFSET ERROR vs. VREF
(MAX11202A/MAX11202B)
2.0
VREF = VREFP - VREFN
1.5
TA = +25°C
1.0
0.5
0 ^{TA = +85°C T}A ^{= -45°C}
-0.5
-1.0
1.0 1.5 2.0 2.5 3.0 3.5 4.0
VREF VOLTAGE (V)
NOISE vs. TEMPERATURE
4.0
VREF = 3.0V
3.5
3.0
2.5
MAX11202A
2.0
1.5
1.0
MAX11202B
0.5
0
-45 -25 -5 15 35 55 75 95
TEMPERATURE (°C)
LONG-TERM ADC READINGS
(MAX11202A)
15
TA = +25°C
10
VIN = 0V
RMS = 2.1µV
5
0
-5
-10
-15
0
0.2 0.4 0.6 0.8 1.0
TIME (min)
OFFSET ERROR vs. TEMPERATURE
(MAX11202A/MAX11202B)
2.5
CALIBRATED AT +25°C
2.0
1.5
1.0
0.5
0
-45 -25 -5 15 35 55 75 95
TEMPERATURE (°C)
Maxim Integrated