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AD7707 Datasheet(PDF) 13 Page - Analog Devices

Part No. AD7707
Description  3-Channel 16-Bit, Sigma-Delta ADC
Download  53 Pages
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD7707 Datasheet(HTML) 13 Page - Analog Devices

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AD7707
Rev. B | Page 12 of 52
TYPICAL PERFORMANCE CHARACTERISTICS
CODE
32,764
400
0
32,765
32,766
32,767
32,768
32,769
32,770
300
200
100
READING NUMBER
32,763
0100
32,764
32,765
32,766
32,767
32,768
32,769
32,770
32,771
200
300
400
500
600
700
800
900 1000
VDD = 5V
VREF = 2.5V
GAIN = 128
50Hz UPDATE RATE
TA = 25°C
RMS NOISE = 600nV
Figure 4. Typical Noise Plot at Gain = 128 with 50 Hz Update Rate for Low
Level Input Channel
Figure 7. Histogram of Data in Figure 4
READING NUMBER
0
32,769
32,768
32,767
32,766
10Hz UPDATE RATE, UNBUFFERED MODE
GAIN = 2 (±10V INPUT RANGE)
BIPOLAR MODE
ANALOG INPUT SET ON CODE TRANSITION
200
400
600
800
1000
CODE
0
800
700
600
500
400
300
200
100
10Hz UPDATE RATE
UNBUFFERED MODE
BIPOLAR MODE
GAIN = 2
(±10V INPUT RANGE)
1
32,767
2
32,768
Figure 8. Histogram of Data in Figure 5
Figure 5. Typical Noise Plot for AIN3, High Level Input Channel
AIN3 (V)
–10
7
8
9
10
–6
–2
2
6
10
BUFFERED MODE
UNBUFFERED MODE
6
5
4
3
2
1
0
HIGH LEVEL INPUT CHANNEL
±10V INPUT RANGE
10Hz UPDATE RATE
AVDD= DVDD= 5V
REF IN(+) = 2.5V
REF IN(–) = AGND
TA = 25°C
INPUT VOLTAGE (mV)
–20
0
0.2
0.4
0.6
0
2
5
1
0
1
0
1
5
1
BUFFERED MODE
UNBUFFERED MODE
–5
0
5
0.5
0.3
0.1
LOW LEVEL INPUT CHANNEL
GAIN = 128
10Hz UPDATE RATE
AVDD= DVDD= 5V
REF IN(+) = 2.5V
REF IN(–) = AGND
TA = +25°C
Figure 6. Typical RMS Noise vs. Analog Input Voltage for High Level Input
Channel, AIN3
Figure 9. Typical RMS Noise vs. Analog Input Voltage for Low Level Input
Channels, AIN1 and AIN2


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