AD7793 Analog Devices, AD7793 Datasheet - Page 13

• Manufacturer Part Number: AD7793
• Description: 3-Channel, Low Noise, Low Power, 24-Bit Sigma Delta ADC with On-Chip In-Amp and Reference
• Manufacturer: Analog Devices

Specifications of AD7793

• Resolution (bits): 24bit
• # Chan: 3
• Sample Rate: n/a
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: (2Vref/PGA Gain) p-p
• Adc Architecture: Sigma-Delta
• Pkg Type: SOP

TYPICAL PERFORMANCE CHARACTERISTICS
8388800
8388750
8388700
8388650
8388600
8388550
8388500
8388450
8388482
16
14
12
10
20
10
Figure 8. Excitation Current Matching (210 μA) at Ambient
8
6
4
2
0
Figure 6. Typical Noise Plot (Internal Reference, Gain = 64,
0
(Internal Reference, Gain = 64, Update Rate = 16.7 Hz)
–2.0
0
Figure 7. Noise Distribution Histogram for AD7793
8388520
–1.2
Update Rate = 16.7 Hz) for AD7793
200
–0.8
8388560
–0.4
Temperature
MATCHING (%)
8388600
READING NUMBER
400
0
CODE
0.4
8388640
600
0.8
8388680
1.2
800
8388720
1.6
2.0
8388750
1000
Rev. B | Page 13 of 32
Figure 10. Bias Voltage Generator Power-Up Time vs. Load Capacitance
Figure 9. Excitation Current Matching (1 mA) at Ambient Temperature
3.0
2.5
2.0
1.5
1.0
0.5
20
10
90
80
70
60
50
40
30
20
10
0
0
0
0
0
–1.75 –1.05 –0.70 –0.35
Figure 11. RMS Noise vs. Reference Voltage (Gain = 1)
V
UPDATE RATE = 16.6Hz
T
A
DD
= 25°C
0.5
= 5V
200
1.0
1.5
REFERENCE VOLTAGE (V)
LOAD CAPACITANCE (nF)
400
2.0
MATCHING (%)
0
2.5
0.35
AD7792/AD7793
600
3.0
0.70
3.5
1.05
800
4.0
1.40
4.5
1.75
1000
5.0