AD7708/AD7718–Typical Performance Characteristics
8389600
8389400
AVDD = DVDD = 5V
INPUT RANGE = ؎20mV
REFIN1(+)–REFIN1(–) = 2.5V
UPDATE RATE = 19.79Hz
8389200
8389000
8388800
8388600
8388400
8388200
8388000
0
RMS NOISE = 0.58V rms
TA = 25؇C
VREF = 2.5V
100 200 300 400 500 600 700 800 900 1000
READING NUMBER
TPC 1. AD7718 Typical Noise Plot on ±20 mV Input Range
with 19.79 Hz Update Rate
26
CHOP = 0
24
22
20
18
16
0 10 20 30 40 50 60 70 80 90 100 110
UPDATE RATE – Hz
TPC 4. AD7718 No-Missing Codes Performance
9
8
7
6
5
4
3
2
1
0
TPC 2. AD7718 Noise Distribution Histogram
32772
32771
32770
AVDD = DVDD = 5V
INPUT RANGE = ؎20mV
UPDATE RATE = 19.79Hz
32769
32768
32767
32766
32765
32764
0
VREF = 2.5V
TA = 25 C
100 200 300 400 500 600 700 800 900 1000
READING NUMBER
TPC 5. AD7708 Typical Noise Plot on ±20 mV Input Range
3.0
2.5
؎2.56V RANGE
2.0
AVDD = DVDD = 5V
1.5
VREF = 2.5V
INPUT RANGE = ؎2.56V
UPDATE RATE = 19.79Hz
TA = 25؇C
1.0
؎20mV RANGE
0.5
0
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
VREF – V
TPC 3. RMS Noise vs. Reference Input
(AD7718 andAD7708)
700
600
500
400
300
200
100
0
32766
32767
32768 32769
CODE
32770
32771
TPC 6. AD7708 Noise Histogram
–14–
REV. 0