AD7877 Analog Devices, AD7877 Datasheet - Page 13

• 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
TERMINOLOGY
Integral Nonlinearity (INL)
The maximum deviation from a straight line passing through
the endpoints of the ADC transfer function. The endpoints of
the transfer function are zero scale at 1 LSB below the first code
transition, and full scale at 1 LSB above the last code transition.
Differential Nonlinearity (DNL)
The difference between the measured and the ideal 1 LSB
change between any two adjacent codes in the ADC.
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Offset Error
The deviation of the first code transition (00…000) to
(00…001) from the ideal (AGND + 1 LSB).
Gain Error
The deviation of the last code transition (111…110) to
(111…111) from the ideal (V
error has been adjusted out.
On Resistance
A measure of the ohmic resistance between the drain and the
source of the switch drivers.
REF
− 1 LSB) after the offset
AD7877