AD7877ACPZ-REEL7(RevA) View Datasheet(PDF) - Analog Devices

Part Name

Description

MFG CO.

AD7877ACPZ-REEL7
(Rev.:RevA)

Touch Screen Controller

Analog Devices 

AD7877

Pin No.

29

30

31

Mnemonic

ARNG

AOUT

VREF

Description

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. A capacitor of 100nF

is strongly recommended between the VREF pin and GND to reduce system noise effects.

Alternatively, an external reference can be applied to this input. The voltage range for the external reference is

1.0 V to VCC. For the specified performance, it is 2.5 V on the AD7877.

Rev. A | Page 8 of 44

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