DAC34H84 Datasheet, PDF (15/80 Pages) Texas Instruments – Quad-Channel, 16-Bit, 1.25 GSPS Digital-to-Analog Converter (DAC)

DAC34H84
www.ti.com
SLAS751A – MARCH 2011 – REVISED JUNE 2011
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)
10
0
−10
−20
−30
−40
−50
−60
−70
−80
−90
10
PLL Enabled w/ PFD of 78.125 MHz
f_DAC = 1250 MSPS
f_OUT = 200 MHz
110
210
310
410
510
610
Frequency (MHz)
Figure 13. Single Tone Spectral Plot
100
0 dBFS
90
−6 dBFS
−12 dBFS
80
70
60
50
40
30
0
100
200
300
400
500
600
Output Frequency (MHz)
Figure 14. IMD3 vs Output Frequency Over Input Scale
100
90
80
70
60
50
40
30
0
f_DATA = 625 MSPS, 1x Interpolation
f_DATA = 625 MSPS, 2x Interpolation
f_DATA = 312.5 MSPS, 4x Interpolation
f_DATA = 156.25 MSPS, 8x Interpolation
f_DATA = 78.125 MSPS, 16x Interpolation
100
200
300
400
500
600
Output Frequency (MHz)
Figure 15. IMD3 vs Output Frequency Over Interpolation
100
90
80
70
60
50
40
30
0
I_OUTFS = 10 mA w/ 4:1 Transformer
I_OUTFS = 20 mA w/ 4:1 Transformer
I_OUTFS = 30 mA w/ 2:1 Transformer
50 100 150 200 250 300 350 400
Output Frequency (MHz)
Figure 17. IMD3 vs Output Frequency Over I_OUTFS
100
f_DAC = 600 MSPS
90
f_DAC = 800 MSPS
f_DAC = 1000 MSPS
80
f_DAC = 1250 MSPS
70
60
50
40
30
0
100
200
300
400
500
600
Output Frequency (MHz)
Figure 16. IMD3 vs Output Frequency Over f_DAC
0
−10
−20
−30
−40
−50
−60
−70
−80
−90
−100
65
NCO Bypassed
QMC Bypassed
f_DAC = 1250 MSPS
f_OUT = 70 MHz
Tone Spacing = 1 MHz
66 67 68 69 70 71 72 73 74 75
Frequency (MHz)
Figure 18. Two Tone Spectral Plot
Copyright © 2011, Texas Instruments Incorporated
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