AD7877 Analog Devices, AD7877 Datasheet - Page 10

• Manufacturer Part Number: AD7877
• Description: Touch Screen Controller
• Manufacturer: Analog Devices

Specifications of AD7877

• Resolution (bits): 12bit
• # Chan: 9
• Sample Rate: 125kSPS
• Interface: Ser
• Analog Input Type: SE-Uni
• Ain Range: Uni (Vref),Uni 2.5V
• Adc Architecture: SAR
• Pkg Type: CSP

AD7877
–0.2
–0.4
–0.6
–0.8
–1.0
1.0
0.8
0.6
0.4
0.2
22
20
18
16
14
12
10
22
20
18
16
14
12
10
0
8
8
–40
2.7
0
Figure 14. Switch On Resistance vs. Temperature
500
Figure 13. Switch On Resistance vs. V
(X+, Y+: V
(X+, Y+: V
3.1
–20
X+ TO V
1000
X+ TO V
Figure 12. ADC DNL Plot
3.5
CC
CC
CC
0
to Pin; X−, Y−: Pin to GND)
to Pin; X−, Y−: Pin to GND)
1500
Y+ TO V
TEMPERATURE (°C)
CC
Y+ TO V
3.9
V
2000
CODE
20
CC
CC
CC
(V)
4.3
X– TO GND
2500
Y– TO GND
Y– TO GND
X– TO GND
40
4.7
3000
CC
60
3500
5.1
4000
80
5.5
Rev. D | Page 10 of 44
2.520
2.515
2.510
2.505
2.500
2.495
2.490
2.485
2.480
2.475
2.508
2.506
2.504
2.502
2.500
2.498
2.496
16
14
12
10
8
6
4
2
0
–50
–50
Figure 15. External Reference Current vs. Temperature
2.6
2.9
Figure 16. Internal V
–30
–30
Figure 17. Internal V
3.2
–10
–10
TEMPERATURE (°C)
TEMPERATURE (°C)
3.5
10
10
V
3.8
REF
CC
vs. Temperature
(V)
REF
30
30
4.1
vs. V
CC
50
50
4.4
Data Sheet
4.7
70
70
5.0
90
90