DAC1282IPW datasheet(35/43 Pages) TI1

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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

www.ti.com

SBAS490

– DECEMBER 2011

APPLICATION INFORMATION

BASIC CONNECTION

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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