-90

95

100

105

110

115

120

125

130

135

-

-

-

-

-

-

-

-

-

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

CLK (MHz)

G = 1/1

G = 1/2

G = 1/4

G = 1/8

G = 1/16

G = 1/32

G = 1/64

f = CLK/2 , 0.5dBFS

-

O

17

THD resolution of low

gains limited by FFT size

CLK (MHz)

125

120

115

110

105

100

95

90

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

CLK (MHz)

G = 1/1

G = 1/2

G = 1/4

G = 1/8

G = 1/16

G = 1/32

G = 1/64

f = CLK/2 , 0.5dBFS

-

O

17

-

-

-

-

-

-

-

-

95

100

105

110

115

120

125

130

135

-

3.5

4.0

4.5

5.0

5.2

Reference Voltage (V)

G = 1/1

G = 1/2

G = 1/4

G = 1/8

G = 1/16

G = 1/32

G = 1/64

2.5

3.0

125

120

115

110

105

100

95

90

85

3.5

4.0

4.5

5.0

5.2

Reference Voltage (V)

2.5

3.0

G = 1/1

G = 1/2

G = 1/4

G = 1/8

G = 1/16

G = 1/32

G = 1/64

4

3

2

1

0

-55

-35

-15

5

25

45

65

85

105

125

Temperature ( C)

°

G = 1/1

G = 1/2

G = 1/4

G = 1/8

G = 1/16

G = 1/32

G = 1/64

20

15

10

5

0

Total Harmonic Distortion (dB)

30 Units

G = 1/1

G = 1/4

G = 1/16

G = 1/64

DAC1280

SBAS432A – APRIL 2010 – REVISED SEPTEMBER 2010

www.ti.com

TYPICAL CHARACTERISTICS (continued)

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

sampling and complement gain setting).

THD vs CLK

SNR vs CLK

Figure 20.

Figure 21.

Figure 22.

Figure 23.

ANALOG POWER-SUPPLY CURRENT vs

THD HISTOGRAM

TEMPERATURE

Figure 24.

Figure 25.

10

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