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AD7843 Datasheet(PDF) 10 Page - Analog Devices

Part # AD7843
Description  Touch Screen Digitizer
PDF  21 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7843 Datasheet(HTML) 10 Page - Analog Devices

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AD7843
Rev. B | Page 9 of 20
0.5
1.5
2.5
3.5
4.5
5.5
6.5
7.5
70
55
25
40
10
85
100
115
130
SAMPLE RATE (kHz)
Figure 10. Reference Current vs. Sample Rate
Y+
X+
X–
Y–
4
5
6
7
8
9
10
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
+VCC (V)
Figure 11. Switch-On Resistance vs. +VCC
(X+, Y+: +VCC to Pin; X−, Y−: Pin to GND)
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
15
35
55
75
95
115
135
155
175
195
SAMPLING RATE (kSPS)
INL: R = 2k
Ω
INL: R = 500
Ω
DNL: R = 2k
Ω
DNL: R = 500
Ω
Figure 12. Maximum Sampling Rate vs. RIN
2
4
6
5
3
8
7
10
9
12
11
14
13
020
–40
–20
40
60
80
TEMPERATURE (°C)
Figure 13. Reference Current vs. Temperature
Y+
X+
X–
Y–
3
4
5
6
7
8
9
–40
–20
0
20
40
60
80
100
TEMPERATURE (°C)
Figure 14. Switch-On Resistance vs. Temperature
(X+, Y+:+VCC to Pin; X−, Y−: Pin to GND)
120
100
80
60
40
20
0
30.0
22.5
7.5
15.0
0
37.5
45.0
52.5
60.0
FREQUENCY (kHz)
fSAMPLE = 125kHz
fIN = 15kHz
SNR = 68.34dB
Figure 15. Auxiliary Channel Dynamic Performance
(fSAMPLE =125 kHz, fINPUT = 15 kHz)



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