DAC37J82_16 Datasheet, PDF (18/122 Pages) Texas Instruments – Digital-to-Analog Converters

DAC37J82, DAC38J82
SLASE16B – JANUARY 2014 – REVISED MAY 2014
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Typical Characteristics (continued)
Unless otherwise noted, all plots are at T_A = 25°C, nominal supply voltages, f_DAC = 2460MSPS, 2x interpolation, 0dBFS digital
input, 20mA full scale output current with 2:1 transformer, LMF = 421 and PLL is disabled.
170
90
PLL off
PLL on
f_DAC = 2457.6MSPS
f_DAC = 1966.08MSPS
f_DAC = 1474.56MSPS
160
80
150
70
140
60
130
0 50 100 150 200 250 300 350 400 450 500
Output Frequency (MHz)
D001
f_ref = f_DAC/4, M = 32, N = 8, Prescaler = 2 for PLL On
50
0 50 100 150 200 250 300 350 400 450 500
Output Frequency (MHz)
D001
Single Carrier WCDMA
Figure 25. NSD vs Output Frequency Over Clocking Options
100
f_DAC = 2457.6MSPS
f_DAC = 1966.08MSPS
f_DAC = 1474.56MSPS
90
Figure 26. ACLR (Adjacent Channel) vs Output Frequency
Over f_DAC
90
PLL off
PLL on
80
80
70
70
60
60
0 50 100 150 200 250 300 350 400 450 500
Output Frequency (MHz)
D001
Single Carrier WCDMA
Figure 27. ACLR (Alternate Channel) vs Output Frequency
Over f_DAC
100
PLL off
PLL on
90
50
0 50 100 150 200 250 300 350 400 450 500
Output Frequency (MHz)
D001
Single Carrier WCDMA; f_ref = f_DAC/4, M = 32, N = 8, Prescaler = 2 for
PLL On
Figure 28. ACLR (Adjacent Channel) vs Output Frequency
Over Clocking Options
100
between Channel A&B
between Channel C&D
90
80
80
70
60
70
50
60
0 50 100 150 200 250 300 350 400 450 500
Output Frequency (MHz)
D001
Single Carrier WCDMA; f_ref = f_DAC/4, M = 32, N = 8, Prescaler = 2
for PLL On
Figure 29. ACLR (Alternate Channel) vs Output Frequency
Over Clocking Options
40
0 50 100 150 200 250 300 350 400 450 500
Output Frequency (MHz)
D001
Between Channel AB pair and CD pair
Figure 30. Channel Isolation
18
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