AD7864 datasheet(13/29 Pages) AD

Part #	AD7864

Description	4-Channel, Simultaneous Sampling, High Speed, 12-Bit ADC

PDF	29 Pages

Scroll/Zoom	100%

Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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13 / 29 page

AD7864

Rev. D | Page 12 of 28

nominal source impedance for this output. The tolerance on the

internal reference is ±10 mV at 25°C with a typical temperature

coefficient of 25 ppm/°C and a maximum error overtemperature

of ±20 mV.

If the application requires a reference with a tighter tolerance or

the AD7864 needs to be used with a system reference, the user

has the option of connecting an external reference to this VREF

pin. The external reference effectively overdrives the internal

reference and thus provides the reference source for the ADC.

The reference input is buffered before being applied to the ADC

with the maximum input current of ±100 μA. Suitable reference

sources for the AD7864 include the AD680, AD780, REF192,

and REF43 precision 2.5 V references.

AD7864 Datasheet(PDF) 13 Page - Analog Devices