AD7877 Datasheet, PDF (11/44 Pages) Analog Devices – Touch Screen Controller

1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
500 1000 1500 2000 2500 3000 3500 4000
CODE
Figure 11. ADC DNL Plot
22
20
18
X– TO GND
16
Y– TO GND
14
Y+ TO V_DD
12
10
X+ TO V_DD
8
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
V_DD (V)
Figure 12. Switch On Resistance vs. VCC
(X+, Y+: VCC to Pin; X−, Y−: Pin to GND)
22
20
X– TO GND
18
16
Y– TO GND
14
Y+ TO V_DD
12
10
X+ TO V_DD
8
–40
–20
0
20
40
60
80
TEMPERATURE (°C)
Figure 13. Switch On Resistance vs. Temperature
(X+, Y+: VCC to Pin; X−, Y−: Pin to GND)
AD7877
16
14
12
10
8
6
4
2
0
–50
–30
–10
10
30
50
70
90
TEMPERATURE (°C)
Figure 14. External Reference Current vs. Temperature
2.520
2.515
2.510
2.505
2.500
2.495
2.490
2.485
2.480
2.475
–50
–30
–10
10
30
50
70
90
TEMPERATURE (°C)
Figure 15. Internal VREF vs. Temperature
2.508
2.506
2.504
2.502
2.500
2.498
2.496
2.6 2.9 3.2 3.5 3.8 4.1 4.4 4.7 5.0
V_CC (V)
Figure 16. Internal VREF vs. VCC
Rev. A | Page 11 of 44