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AD7873ACP Datasheet(PDF) 3 Page - Analog Devices

Part # AD7873ACP
Description  Touch Screen Digitizer
PDF  28 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7873ACP Datasheet(HTML) 3 Page - Analog Devices

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AD7873
Rev. D | Page 3 of 28
SPECIFICATIONS
VCC = 2.7 V to 3.6 V, VREF = 2.5 V internal or external, fDCLK = 2 MHz; TA = −40°C to +85°C, unless otherwise noted.
Table 1.
Parameter
AD7873A1
AD7873B
1
Unit
Test Conditions/Comments
DC ACCURACY
Resolution
12
12
Bits
No Missing Codes
11
12
Bits min
Integral Nonlinearity2
±2
± 1
LSB max
Differential Nonlinearity2
–0.9/+1.5
LSB max
Offset Error2
±6
±6
LSB max
+VCC = 2.7 V
Gain Error2
±4
±4
LSB max
External reference
Noise
70
70
µV rms typ
Power Supply Rejection
70
70
dB typ
SWITCH DRIVERS
On Resistance2
Y+, X+
5
5
Ω typ
Y–, X–
6
6
Ω typ
ANALOG INPUT
Input Voltage Ranges
0 to VREF
0 to VREF
Volts
DC Leakage Current
±0.1
±0.1
µA typ
Input Capacitance
37
37
pF typ
REFERENCE INPUT/OUTPUT
Internal Reference Voltage
2.45/2.55
2.45/2.55
V min/max
Internal Reference Tempco
± 15
± 15
ppm/°C typ
VREF Input Voltage Range
1/VCC
1/VCC
V min/max
DC Leakage Current
±1
± 1
µA max
VREF Input Impedance
1
1
GΩ typ
CS = GND or +VCC; typically 260 Ω when on-
board reference enabled
TEMPERATURE MEASUREMENT
Temperature Range
–40/+85
–40/+85
°C min/max
Resolution
Differential Method3
1.6
1.6
°C typ
Single Conversion Method4
0.3
0.3
°C typ
Accuracy
Differential Method3
±2
±2
°C typ
Single Conversion Method4
±2
±2
°C typ
BATTERY MONITOR
Input Voltage Range
0/6
0/6
V min/max
Input Impedance
10
10
kΩ typ
Sampling; 1 GΩ when battery monitor off
Accuracy
± 2.5
± 2
% max
External reference
± 3
± 3
% max
Internal reference
LOGIC INPUTS
Input High Voltage, VINH
2.4
2.4
V min
Input Low Voltage, VINL
0.4
0.4
V max
Input Current, IIN
±1
±1
µA max
Typically 10 nA, VIN = 0 V or +VCC
Input Capacitance, CIN5
10
10
pF max
Footnotes on next page.



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