DGND

SWOUTN SWOUTP

SWINP SWINN

DVDD

AVDD

(24)

AVDD

(13)

VREF

REF5050

REF5045

Controller

4.096 MHz

50

0.1 µF

100 µF

1 µF

+V

+2.5 V

+3.3 V

Output

CAPN

CAPP

C

1 nF C0G

1

C

1 nF C0G

2

VOUTP

VOUTN

Switched Output

CLK

CS

SCLK

DIN

DOUT

SYNC

SW/TD

RESET/PWDN

50

50

50

R

50

1

R

50

2

1 µF

DAC1282

AVSS

(14)

-2.5 V

1 µF

AVSS

(23)

1 µF

NR

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

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

Figure 50. Basic Connection

Copyright

© 2011, Texas Instruments Incorporated

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