DAC1280_15 Datasheet, PDF (9/24 Pages) Texas Instruments – Low Distortion Digital-to-Analog Converter for Seismic Monitoring

DAC1280
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SBAS432A – APRIL 2010 – REVISED SEPTEMBER 2010
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 TEMPERATURE
SNR vs TEMPERATURE
-100
-105
-110
-115
-120
-125
G = 1/1
G = 1/2
G = 1/4
G = 1/8
G = 1/16
G = 1/32
G = 1/64
125
G = 1/1
120
G = 1/4
115
110
105
G = 1/2
G = 1/8
G = 1/16
G = 1/32
-130
100
G = 1/64
-135
-55 -35 -15
5 25 45 65
Temperature (°C)
Figure 14.
85 105 125
95
-55 -35 -15
5 25 45 65
Temperature (°C)
Figure 15.
85 105 125
-100
-105
-110
THD vs OUTPUT FREQUENCY
G = 1/1
G = 1/2
G = 1/4
G = 1/8
G = 1/16
G = 1/32
G = 1/64
-115
-120
-125
-130
0.1
1
10
100
1k
Output Frequency (Hz)
Figure 16.
THD vs OUTPUT AMPLITUDE⁽¹⁾
-20
-40
-60
-80
-100
G = 1/1
G = 1/16
-120
G = 1/2
G = 1/4
G = 1/32
G = 1/64
G = 1/8
-140
-100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0
Output Amplitude (dB)
(1) THD measurement noise limited for amplitudes less than –10dB.
Figure 18.
SNR vs OUTPUT FREQUENCY
125
G = 1/1
120
G = 1/2
G = 1/4
115
G = 1/8
110
G = 1/16
105 ^{G = 1/32}
100
0.1
1
10
100
1k
Output Frequency (Hz)
Figure 17.
SNR vs OUTPUT AMPLITUDE
125
G = 1/1
G = 1/16
G = 1/2
G = 1/32
100
G = 1/4
G = 1/64
G = 1/8
75
50
25
0
-100
-80
-60
-40
-20
0
Output Amplitude (dB)
Figure 19.
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