DAC38RF82_17 Datasheet, PDF (21/140 Pages) Texas Instruments – Dual-Channel, Differential-Output, 14-Bit, 9-GSPS, RF-Sampling DAC With JESD204B Interface, On-Chip PLL and Wide-Band Interpolation

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DAC38RF82, DAC38RF89
SLASEA6B – FEBRUARY 2017 – REVISED AUGUST 2017
Typical Characteristics (continued)
Unless otherwise noted, all plots are at T_A = 25°C, nominal supply voltages, f_DAC = 8847.36MSPS, 12x interpolation, 0dBFS
digital input, 40 mA full scale output current , LMFSHd = 84111 and PLL is disabled.
-60
-80
-100
-120
CP=2
CP=3
CP=4
CP=5
CP=6
CP=7
CP=8
CP=9
CP=10
CP=11
CP=12
CP=13
CP=14
CP=15
-80
-100
-120
CP=1
CP=2
CP=3
CP=4
CP=5
CP=6
CP=7
CP=8
CP=9
CP=10
CP=11
CP=12
CP=13
CP=14
CP=15
-140
-140
-160
1000
10000
100000 1000000
1E+7 5E+7
Freq offset (Hz)
D027
VCO frequency = 8.85 GHz
Measured at 1.8 GHz
Figure 17. DAC38RF82 VCO1 Phase Noise vs Offset
Frequency Over Charge pump current
-90
div4
div3
-100
div2
-160
1000
10000
100000 1000000
1E+7 5E+7
Freq offset (Hz)
D003
VCO frequency = 7.5 GHz
Measured at 1.8 GHz
Figure 18. DAC38RF89 VCO1 Phase Noise vs Offset
Frequency Over Charge pump current
-90
div4
div3
-100
div2
-110
-110
-120
-120
-130
-130
-140
-140
-150
-150
-160
1000
10000
100000 1000000
Freq offset (Hz)
VCO frequency = 8.85 GHz
1E+7
5E+7
D028
Figure 19. DAC38RF82 VCO1 Output Clock Phase Noise vs
Offset frequency Over Divider Ratio
-160
1000
10000
100000 1000000
Freq offset (Hz)
VCO frequency = 7.5 GHz
1E+7
5E+7
D004
Figure 20. DAC38RF89 VCO1 Output Clock Phase Noise vs
Offset frequency Over Divider Ratio
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