AD7873 Analog Devices, AD7873 Datasheet - Page 11

• Manufacturer Part Number: AD7873
• Description: Touch Screen Digitizer
• Manufacturer: Analog Devices

Specifications of AD7873

• Resolution (bits): 12bit
• # Chan: 6
• Sample Rate: 125kSPS
• Interface: Ser
• Analog Input Type: SE-Uni
• Ain Range: Uni (Vref),Uni 2.5V
• Adc Architecture: SAR
• Pkg Type: CSP,SOP

2.504
2.502
2.500
2.498
2.496
2.494
2.492
2.490
2.488
2.486
2.484
730
729
728
727
726
725
724
723
722
721
720
Figure 18. Temp Diode Voltage vs. Temperature (2.7 V Supply)
850
800
750
700
650
600
550
500
450
2.7
–40 –30 –20 –10
2.5
95.95mV
Figure 19. TEMP1 Diode Voltage vs. V
2.7
Figure 17. Internal V
TEMP0
3.0
2.9
0
TEMPERATURE (°C)
10
TEMP1
V
SUPPLY
+V
20
3.1
CC
(V)
REF
30
(V)
vs. +V
40
3.3
3.3
SUPPLY
CC
50
(25°C)
60
3.5
142.15mV
70
80
3.6
3.7
Rev. E | Page 11 of 28
610
609
608
607
606
605
604
603
602
601
600
100
120
5
4
3
2
1
0
20
40
60
80
0
2.7
0
0
Figure 22. Auxiliary Channel Dynamic Performance
SETTLING TIME
NO CAP (7µs)
Figure 21. TEMP0 Diode Voltage vs. V
200
2.8
7.5
Figure 20. Internal V
400
(f
2.9
SAMPLE
15.0
600
3.0
=125 kHz, f
TURN-ON TIME (µs)
22.5
FREQUENCY (kHz)
1µF CAP (1800µs)
800
V
SETTLING TIME
3.1
SUPPLY
30.0
REF
INPUT
1000
vs. Turn-on Time
3.2
(V)
= 15 kHz)
37.5
1200
3.3
f
f
SNR = 68.34dB
SAMPLE
IN
SUPPLY
45.0
= 15kHz
1400
3.4
(25°C)
= 125kHz
52.5
1600
3.5
AD7873
60.0
1800
3.6