Datasheet

REV. A
AD7709–Typical Performance Characteristics
–10–
200
3276732766 32768 3277032769
600
500
400
300
700
CODE
OCCURRENCE
32771
100
0
TPC 3. Noise Histogram
OSCILLATOR
V
DD
= 5V
T
A
= 25C
TIME BASE = 100ms/DIV
TRACE 1 = TRACE 2 = 2V/DIV
V
DD
TPC 4. Typical Oscillator Power-Up
32767
1000 200 400300
32771
32770
32769
32768
32772
READING NUMBER
CODE READ
500
32766
32765
32764
600 700 800 900 1000
V
DD
= 5V
INPUT RANGE = 20mV
UPDATE RATE = 19.79Hz
V
REF
= 2.5V
T
A
= 25 C
TPC 1. Typical Noise Plot on ± 20 mV Input Range
2.5
0
1.0 3.02.52.01.5 3.5 5.04.54.0
2.0
1.5
1.0
0.5
3.0
V
REF
– V
RMS NOISE – V
20mV RANGE
2.56V RANGE
V
DD
= 5V
V
REF
= 2.5V
INPUT RANGE = 2.56V
UPDATE RATE = 19.79Hz
T
A
= 25C
TPC 2. RMS Noise vs. Reference Input