AD7225LP datasheet(16/24 Pages) AD

Part #	AD7225LP

Description	LC2MOS Quad 8-Bit DAC with Separate Reference Inputs

PDF	24 Pages

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Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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16 / 24 page

AD7225

Rev. C | Page 16 of 24

AC REFERENCE SIGNAL

In some applications, it may be desirable to have ac reference

signals. The AD7225 has multiplying capability within the

upper (VDD − 4 V) and lower (2 V) limits of reference voltage

when operated with dual supplies. Therefore, ac signals need to

be ac-coupled and biased up before being applied to the

reference inputs. Figure 19 shows a sine wave signal applied to

VREFA. For input signal frequencies up to 50 kHz, the output

distortion typically remains less than 0.1%. The typical 3 dB

bandwidth figure for small signal inputs is 800 kHz.

*DIGITAL INPUTS OMITTED FOR CLARITY.

VDD

VSS

AGND

DGND

VOUTA

DAC A

AD7225*

VREFA

+15V

15k

Ω

10k

Ω

+4V

–4V

REFERENCE

INPUT

Figure 19. Applying an AC Signal to the AD7225

AD7225LP Datasheet(PDF) 16 Page - Analog Devices