AD7873 Analog Devices, AD7873 Datasheet - Page 3

• 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

SPECIFICATIONS
V
Table 1.
Parameter
DC ACCURACY
SWITCH DRIVERS
ANALOG INPUT
REFERENCE INPUT/OUTPUT
TEMPERATURE MEASUREMENT
BATTERY MONITOR
LOGIC INPUTS
CC
Resolution
No Missing Codes
Integral Nonlinearity
Differential Nonlinearity
Offset Error
Gain Error
Noise
Power Supply Rejection
On Resistance
Input Voltage Ranges
DC Leakage Current
Input Capacitance
Internal Reference Voltage
Internal Reference Tempco
V
DC Leakage Current
V
Temperature Range
Resolution
Accuracy
Input Voltage Range
Input Impedance
Accuracy
Input High Voltage, V
Input Low Voltage, V
Input Current, I
Input Capacitance, C
REF
REF
= 2.7 V to 3.6 V, V
Y+, X+
Y–, X–
Differential Method
Single Conversion Method
Differential Method
Single Conversion Method
Input Voltage Range
Input Impedance
2
2
2
IN
REF
INL
IN
2
INH
5
3
3
= 2.5 V internal or external, f
2
4
4
AD7873A
12
11
±2
±6
±4
70
70
5
6
0 to V
±0.1
37
2.45/2.55
±15
1/V
±1
1
–40/+85
1.6
0.3
±2
±2
0/6
10
±2.5
±3
2.4
0.4
±1
10
CC
REF
1
DCLK
AD7873B
12
12
± 1
–0.9/+1.5
±6
±4
70
70
5
6
0 to V
±0.1
37
2.45/2.55
±15
1/V
± 1
1
–40/+85
1.6
0.3
±2
±2
0/6
10
±2
±3
2.4
0.4
±1
10
= 2 MHz; T
CC
Rev. E | Page 3 of 28
REF
1
A
Unit
Bits
Bits min
LSB max
LSB max
LSB max
LSB max
μV rms typ
dB typ
Ω typ
Ω typ
V
μA typ
pF typ
V min/max
ppm/°C typ
V min/max
μA max
GΩ typ
°C min/max
°C typ
°C typ
°C typ
°C typ
V min/max
kΩ typ
% max
% max
V min
V max
μA max
pF max
= −40°C to +85°C, unless otherwise noted.
Test Conditions/Comments
+V
External reference
CS = GND or +V
on-board reference is enabled
Sampling; 1 GΩ when battery monitor is off
External reference
Internal reference
Typically 10 nA, V
CC
= 2.7 V
CC
IN
; typically 260 Ω when the
= 0 V or +V
CC
AD7873