AD7877 Analog Devices, AD7877 Datasheet - Page 3

• Manufacturer Part Number: AD7877
• Description: Touch Screen Controller
• Manufacturer: Analog Devices

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

Data Sheet
SPECIFICATIONS
V
Table 1.
Parameter
DC ACCURACY
SWITCH DRIVERS
ANALOG INPUTS
REFERENCE INPUT/OUTPUT
TEMPERATURE MEASUREMENT
BATTERY MONITOR
CC
Resolution
No Missing Codes
Integral Nonlinearity (INL)
Differential Nonlinearity (DNL)
Offset Error
Gain Error
Noise
Power Supply Rejection
Internal Clock Frequency
On Resistance
Input Voltage Ranges
DC Leakage Current
Input Capacitance
Accuracy
Internal Reference Voltage
Internal Reference Tempco
V
DC Leakage Current
V
Temperature Range
Resolution
Accuracy
Input Voltage Range
Input Impedance
Accuracy
REF
REF
= 2.7 V to 3.6 V, V
Differential Method
Single Conversion Method
Differential Method
Single Conversion Method
Negative DNL
Positive DNL
Y+, X+
Y−, X−
Input Voltage Range
Input Impedance
1
1
1
REF
2
2
= 2.5 V internal or external, f
1
3
3
1
Min
12
11
0
2.44
1
−40
0.5
Typ
12
±5
±3
70
70
2
14
14
±0.1
30
0.3
±50
1
1.6
0.3
±4
±2
14
1
DCLK
= 2 MHz, T
Rev. D | Page 3 of 44
Max
±2
−0.99
+2
V
2.55
V
±1
+85
5
3.2
REF
CC
A
= −40°C to +85°C, unless otherwise noted.
Unit
Bits
Bits
LSB
LSB
LSB
LSB
LSB
µV rms
dB
MHz
Ω
Ω
V
µA
pF
%
V
ppm/°C
V
µA
GΩ
°C
°C
°C
°C
°C
V
kΩ
%
Test Conditions/Comments
LSB size = 610 µV
Minimum LSB size = 610 µV
Specified for 11bits
Specified for 11 bits; external reference
All channels, internal V
CS = GND or V
reference is enabled
0°C to 70°C
Calibrated at 25°C
@ V
Sampling, 1 GΩ when the battery monitor is off
External/internal reference, see Figure 26
REF
= 2.5 V
CC
; typically 25 Ω when the on-board
REF
AD7877