2 k

Output

Amplifier

CAPP

VOUTP

VOUTN

CAPN

Current

DAC

1 nF

1 nF

2 k

DAC1282

SBAS490

– DECEMBER 2011

www.ti.com

OUTPUT FILTER (CAPP, CAPN)

The CAPP and CAPN pins are the connections for two external capacitors, one capacitor connects to CAPP and

VOUTP and the other capacitor connects to CAPN and VOUTN. The capacitors are required to filter the DAC

sampling noise. The capacitor values are 1 nF; capacitors with low voltage coefficients should be used (C0G

ceramic or film).

As seen in Figure 36, the external capacitors form an analog low-pass filter with the internal feedback resistors.

After step changes to the data in the sine, dc, and digital data modes, the settling of the DAC and the analog

filter is 100-

µs typical, as shown in Figure 46. In pulse mode, the filter is internally disabled, yielding shorter

settling time.

Figure 36. Output Filter

20

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© 2011, Texas Instruments Incorporated

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