DAC34H84 Datasheet, PDF (16/80 Pages) Texas Instruments – Quad-Channel, 16-Bit, 1.25 GSPS Digital-to-Analog Converter (DAC)

DAC34H84
SLAS751A – MARCH 2011 – REVISED JUNE 2011
www.ti.com
TYPICAL CHARACTERISTICS (continued)
All plots are at 25°C, nominal supply voltage, f_DAC = 1250 MSPS, 2x interpolation, NCO enabled, Mixer Gain disabled, QMC
enabled with gain set at 1446 for both I/Q channels, 0 dBFS digital input, 20 mA full-scale output current with 4:1 transformer
(unless otherwise noted)
0
−10
f_DAC = 1250 MSPS
f_OUT = 200 MHz
−20
Tone Spacing = 1 MHz
−30
−40
−50
−60
−70
−80
−90
−100
195 196 197 198 199 200 201 202 203 204 205
Frequency (MHz)
Figure 19. Two Tone Spectral Plot
170
0 dBFS
165
−6 dBFS
−12 dBFS
160
155
150
145
140
135
130
0
100
200
300
400
500
600
Output Frequency (MHz)
Figure 20. NSD vs Output Frequency Over Input Scale
170
f_DATA = 625 MSPS, 1x Interpolation
165
f_DATA = 625 MSPS, 2x Interpolation
f_DATA = 312.5 MSPS, 4x Interpolation
160
f_DATA = 156.25 MSPS, 8x Interpolation
f_DATA = 78.125 MSPS, 16x Interpolation
155
150
145
140
135
130
0
100
200
300
400
500
600
Output Frequency (MHz)
Figure 21. NSD vs Output Frequency Over Interpolation
170
I_OUTFS = 10 mA w/ 4:1 Transformer
165
I_OUTFS = 20 mA w/ 4:1 Transformer
I_OUTFS = 30 mA w/ 2:1 Transformer
160
155
150
145
140
135
130
0
50 100 150 200 250 300 350 400
Output Frequency (MHz)
Figure 23. NSD vs Output Frequency Over I_OUTFS
170
f_DAC = 600 MSPS
165
f_DAC = 800 MSPS
f_DAC = 1000 MSPS
160
f_DAC = 1250 MSPS
155
150
145
140
135
130
0
100
200
300
400
500
600
Output Frequency (MHz)
Figure 22. NSD vs Output Frequency Over f_DAC
170
PLL Bypassed
165
PLL Enabled w/ PFD of 78.125 MHz
160
155
150
145
140
135
130
0
100
200
300
400
500
600
Output Frequency (MHz)
Figure 24. NSD vs Output Frequency Over Clocking
Options
16
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