AD7225LR-REEL View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

AD7225LR-REEL

LC2MOS Quad 8-Bit DAC with Separate Reference Inputs

Analog Devices 

AD7225

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.

+4V

REFERENCE

INPUT

–4V

+15V

15kΩ

10kΩ

VREFA

AD7225*

DAC A

+15V

VDD

VOUTA

VSS

AGND

DGND

*DIGITAL INPUTS OMITTED FOR CLARITY.

Figure 19. Applying an AC Signal to the AD7225

Rev. C | Page 16 of 24

Share Link: