DAC1282AIPWR datasheet(29/48 Pages) TI2

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Output Frequency (kHz)

CLK = 4.096MHz

Excludes I/V Filter Rolloff

OUTPUT FREQUENCY RESPONSE

−2

−1

−50

100

150

200

250

300

350

400

450

SYNC pin transition

Time (µs)

VOUTP, VOUTN

DC mode

Full Scale Step

G000

DAC1282, DAC1282A

www.ti.com

SBAS490B – DECEMBER 2011 – REVISED MAY 2015

Figure 46 shows the step response time of the dc mode. The step response of sine and digital data mode have

similar settling times. Note that additional filter components in the signal path may also affect the response time.

Figure 46. DC-Mode Step Response

8.2.12 Frequency Response

The DAC internal signal generator is capable of output signal frequencies from 0.489 Hz to 250 Hz. Frequencies

outside of this range are also possible by driving the DAC directly with an external digital input (bitstream).

However, the DAC low-pass filters the digital input and results in a sinx/x frequency response. The –3 dB signal

bandwidth of the DAC filter is 8.2 kHz. Figure 47 illustrates the DAC1282 frequency response. Note that high-

order noise-shaped digital inputs may limit the useable frequency range as a result of rising noise.

Figure 47. DAC Frequency Response

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DAC1282AIPWR Datasheet(PDF) 29 Page - Texas Instruments