Power Dissipation - Analog Devices AD9776A Manual

POWER DISSIPATION

Figure 91 to Figure 99 show the power dissipation of the 1.8 V
and 3.3 V digital and clock supplies in single DAC and dual DAC
modes. In addition to this, the power dissipation/current of the
3.3 V analog supply (mode and speed independent) in single DAC
0.7
0.6
8× INTERPOLATION,
0.5
ZERO STUFFING
0.4
0.3
0.2
0.1
0
0 25
Figure 91. Total Power Dissipation, I Data Only, Real Mode
0.4
8× INTERPOLATION
0.3
0.2
0.1
0
0 25
Figure 92. Power Dissipation, Digital 1.8 V Supply, I Data Only, Real Mode,
0.08
0.06
8× INTERPOLATION
0.04
0.02
0
0 25
Figure 93. Power Dissipation, Clock 1.8 V Supply, I Data Only, Real Mode,
Includes Modulation Modes, Does Not Include Zero Stuffing
Downloaded from Elcodis.com electronic components distributor
8× INTERPOLATION
4× INTERPOLATION
4× INTERPOLATION,
ZERO STUFFING
2× INTERPOLATION,
ZERO STUFFING
2× INTERPOLATION
1× INTERPOLATION,
ZERO STUFFING
1× INTERPOLATION
50 75 100 125 150 175 200
f
(MSPS)
DATA
4× INTERPOLATION
2× INTERPOLATION
1× INTERPOLATION
50 75 100 125 150 175 200
f
(MSPS)
DATA
Does Not Include Zero Stuffing
4× INTERPOLATION
2× INTERPOLATION
1× INTERPOLATION
50 75 100 125 150 175 200
f
(MSPS)
DATA
mode is 102 mW/31 mA. In dual DAC mode, this is 182 mW/
55 mA. When the PLL is enabled, it adds 50 mA/90 mW to the
1.8 V clock supply.
0.075
0.050
0.025
225 250
Figure 94. Power Dissipation, Digital 3.3 V Supply, I Data Only, Real Mode,
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
225 250
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
225 250
Figure 96. Power Dissipation, Digital 1.8 V Supply, I and Q Data, Dual DAC
Rev. A | Page 47 of 60
AD9776A/AD9778A/AD9779A
ALL INTERPOLATION MODES
0
0 25 50 75 100 125 150
f
(MSPS)
DATA
Includes Modulation Modes and Zero Stuffing
8× INTERPOLATION, ALL
MODULATION MODES
8× INTERPOLATION,
ZERO STUFFING
2× INTERPOLATION,
ZERO STUFFING
4× INTERPOLATION,
1× INTERPOLATION,
ZERO STUFFING
ZERO STUFFING
0
0 25 50 75 100 125 150 175 200 225
f
(MSPS)
DATA
Figure 95. Total Power Dissipation, Dual DAC Mode
8× INTERPOLATION, f /8,
DAC
f /4,
DAC
f /2,
DAC
NO MODULATION
4× INTERPOLATION
0
0 25 50 75 100 125 150
f
(MSPS)
DATA
Mode, Does Not Include Zero Stuffing
175 200 225 250
4× INTERPOLATION,
ALL MODULATION
MODES
2× INTERPOLATION,
ALL MODULATION MODES
1× INTERPOLATION
250 275 300
2× INTERPOLATION
1× INTERPOLATION,
NO MODULATION
175 200 225 2 50