DAC1282IPWR datasheet(36/48 Pages) TI2

36 / 48 page

DGND

SWOUTN SWOUTP

SWINP SWINN

DVDD

AVDD

(24)

AVDD

(13)

VREF

REF5050

REF5045

Controller

4.096 MHz

0.1 µF

100 µF

1 µF

+2.5 V

+3.3 V

Output

CAPN

CAPP

1 nF C0G

VOUTP

VOUTN

Switched Output

CLK

SCLK

DIN

DOUT

SYNC

SW/TD

RESET/PWDN

1 µF

DAC1282

AVSS

(14)

-2.5 V

1 µF

AVSS

(23)

1 µF

4.7 µF

DAC1282, DAC1282A

SBAS490B – DECEMBER 2011 – REVISED MAY 2015

www.ti.com

9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

9.1 Application Information

Figure 50 shows the basic DAC1282 connection. Bipolar analog supplies are shown (±2.5 V). Single-supply

operation is also possible with AVDD = 5 V and AVSS = GND. The digital supply range is 1.65 V to 3.6 V.

A low-noise, low-drift reference is recommended for best performance, such as the REF5050 (+5 V) and

REF5045 (+4.5 V). Best signal-to-noise ratio is achieved with a 5-V reference, although a 4.5-V reference

(REF5045) can be used with 1-dB loss in SNR. The 4.5-V reference can be operated from a 5-V supply. AVSS

(pin 14) is the key reference ground point and should be connected to the reference ground terminal using a star

connection. C1 and C2 are the required 1-nF output filter capacitors. The capacitors should be of the low volt-

coefficient type (such as a COG ceramic or similar) and placed close to the device pins. Output resistors, R1 and

R2, decouple the DAC to ensure best performnace when driving capacitive loads. The output is shown routed to

the signal switch, providing a second, switched DAC output.

Figure 50. Basic Connection

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