AD7707 Analog Devices, AD7707 Datasheet - Page 12

• Manufacturer Part Number: AD7707
• Manufacturer: Analog Devices

Specifications of AD7707

• Resolution (bits): 16bit
• # Chan: 3
• Sample Rate: n/a
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni,SE-Bip
• Ain Range: Bip (Vref)/(PGA Gain),Bip 10V,Bip 5.0V,Uni (Vref)/(PGA Gain),Uni 10V,Uni 5.0V
• Adc Architecture: Sigma-Delta
• Pkg Type: SOIC,SOP

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