AD7877 Analog Devices, AD7877 Datasheet - Page 8

• 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

AD7877
Pin No.
28
29
30
31
Mnemonic
V
ARNG
AOUT
V
DRIVE
REF
Description
Logic Power Supply Input. The voltage supplied at this pin determines the operating voltage for the serial
interface of the AD7877.
When the DAC is in current output mode, a resistor from ARNG to GND sets the output range.
Analog Output Voltage or Current from DAC.
Reference Output for the AD7877. The internal 2.5 V reference is available on this pin for use external to the
device. The reference output must be buffered before it is applied elsewhere in a system. To reduce system
noise effects, it is strongly recommended to place a capacitor of 100 nF between the V
Alternatively, an external reference can be applied to this input. The voltage range for the external reference is
1.0 V to V
CC
. For the specified performance, it is 2.5 V on the AD7877.
Rev. D | Page 8 of 44
REF
pin and GND.
Data Sheet