0

20

40

60

80

100

120

140

160

180

200

-

-

-

-

-

-

-

-

-

-

0

50

100

150

200

250

300

350

400

450

500

Frequency (Hz)

Gain = 1/1

4k FFT

V

= 0.5dBFS, 31.25Hz

THD = 129.2dB

SNR = 120.5dB

-

OUT

-

0

20

40

60

80

100

120

140

160

180

200

-

-

-

-

-

-

-

-

-

-

0

50

100

150

200

250

300

350

400

450

500

Frequency (Hz)

Gain = 1/2

4k FFT

V

= 0.5dBFS, 31.25Hz

THD = 128.9dB

SNR = 119.5dB

-

OUT

-

0

20

40

60

80

100

120

140

160

180

200

-

-

-

-

-

-

-

-

-

-

0

50

100

150

200

250

300

350

400

450

500

Frequency (Hz)

Gain = 1/4

4k FFT

V

= 0.5dBFS, 31.25Hz

THD = 127.6dB

SNR = 117.4dB

-

OUT

-

0

20

40

60

80

100

120

140

160

180

200

-

-

-

-

-

-

-

-

-

-

0

50

100

150

200

250

300

350

400

450

500

Frequency (Hz)

Gain = 1/8

4k FFT

V

= 0.5dBFS, 31.25Hz

THD = 126dB

SNR = 114.1dB

OUT

-

-

0

20

40

60

80

100

120

140

160

180

200

-

-

-

-

-

-

-

-

-

-

0

50

100

150

200

250

300

350

400

450

500

Frequency (Hz)

Gain = 1/16

8k FFT

V

= 0.5dBFS, 31.25Hz

THD = 124.8dB

SNR = 109.4dB

OUT

-

-

0

20

40

60

80

100

120

140

160

180

200

-

-

-

-

-

-

-

-

-

-

0

50

100

150

200

250

300

350

400

450

500

Frequency (Hz)

Gain = 1/32

8k FFT

V

= 0.5dBFS, 31.25Hz

THD = 117.6dB

SNR = 104.8dB

OUT

-

-

DAC1280

www.ti.com

SBAS432A – APRIL 2010 – REVISED SEPTEMBER 2010

TYPICAL CHARACTERISTICS

At TA = +25°C, AVDD = +2.5V, AVSS = +2.5V, DVDD = +3.3V, CLK = 4.096MHz, VREF = +5V, and RREF = 30kΩ, unless

otherwise noted. Data acquired using circuit configuration shown in Figure 35. THD and SNR measured by ADS1282 (1ms

sampling and complement gain setting).

OUTPUT SPECTRUM

OUTPUT SPECTRUM

Figure 2.

Figure 3.

OUTPUT SPECTRUM

OUTPUT SPECTRUM

Figure 4.

Figure 5.

OUTPUT SPECTRUM

OUTPUT SPECTRUM

Figure 6.

Figure 7.

Copyright © 2010, Texas Instruments Incorporated

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