Datasheet

-90
95
100
105
110
115
120
125
130
135
-
-
-
-
-
-
-
-
-
Total Harmonic Distortion (dB)
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
Signal-to-Noise Ratio (dB)
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
-
Total Harmonic Distortion (dB)
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
Signal-to-Noise Ratio (dB)
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
AVDD Current (mA)
-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
Occurrences
-136
-134
-132
-130
-128
-126
-124
-122
-120
-118
-116
-114
-112
-110
-108
-106
-104
-102
-100
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)
At T
A
= +25°C, AVDD = +2.5V, AVSS = +2.5V, DVDD = +3.3V, CLK = 4.096MHz, V
REF
= +5V, and R
REF
= 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).
THD vs CLK SNR vs CLK
Figure 20. Figure 21.
THD vs V
REF
SNR vs V
REF
Figure 22. Figure 23.
ANALOG POWER-SUPPLY CURRENT vs
THD HISTOGRAM TEMPERATURE
Figure 24. Figure 25.
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