AD7877 Analog Devices, AD7877 Datasheet - Page 10
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AD7877
Manufacturer Part Number
AD7877
Description
Touch Screen Controller
Manufacturer
Analog Devices
Datasheet
1.AD7877.pdf
(44 pages)
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
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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