Power Dissipation - Analog Devices AD9776 Instruction Manual

IOUT1_P
IDAC
IOUT1_N
IOUT2_P
QDAC
IOUT2_N
Figure 76. Typical Use of Auxiliary DACs

POWER DISSIPATION

Figure 77 to Figure 85 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 supply (mode and speed independent) in single
DAC mode is 102 mW/31 mA. In dual DAC mode, this is
182 mW/51 mA.
0.7
0.6
8 × INTERPOLATION,
0.5
ZERO STUFFING
0.4
0.3
0.2
0.1
0
0 25 50 75 100
Figure 77. Power Dissipation, I Data Only, Single DAC Mode
AUX
DAC1
AUX1_P AUX1_N
QUAD MOD
I INPUTS
QUAD MOD
Q INPUTS
AUX2_P AUX2_N
AUX
DAC2
8 × INTERPOLATION
4 × INTERPOLATION
4 × INTERPOLATION,
ZERO STUFFING
2 × INTERPOLATION,
ZERO STUFFING
2 × INTERPOLATION
1 × INTERPOLATION,
ZERO STUFFING
1 × INTERPOLATION
125 150 175 200 225 250
f
(MSPS)
DATA
0.7
8 × INTERPOLATION,
0.6
0.5
8 × INTERPOLATION,
ZERO STUFFING
0.4
0.3
0.2
0.1
0
0 25
Figure 78. Power Dissipation, Dual DAC Mode
0.4
8 × INTERPOLATION
0.3
0.2
0.1
0
0 25
Figure 79. Power Dissipation, Digital 1.8 V Supply, I Data Only, Real Mode,
0.08
0.06
0.04
0.02
0
0 25
Figure 80. Power Dissipation, Clock 1.8 V Supply, I Data Only, Real Mode,
Includes Modulation Modes, Does Not Include Zero Stuffing
Rev. 0 | Page 37 of 56
AD9776/AD9778/AD9779
f
/4,
DAC
f ,
/2
4 × INTERPOLATION,
DAC
f ,
/8
DAC
MODULATION OFF
MODULATION OFF
4 × INTERPOLATION,
2 × INTERPOLATION,
ZERO STUFFING
1 × INTERPOLATION,
1 × INTERPOLATION
2 × INTERPOLATION,
f
/2,
DAC
MODULATION OFF
50 75 100 125 150 175
f
(MSPS)
DATA
4 × INTERPOLATION
2 × INTERPOLATION
1 × INTERPOLATION
50 75 100 125 150 175
f
(MSPS)
DATA
Does Not Include Zero Stuffing
8 × INTERPOLATION
4 × INTERPOLATION
2 × INTERPOLATION
1 × INTERPOLATION
50 75 100 125 150 175
f
(MSPS)
DATA
f
/4,
DAC
f ,
/2
DAC
ZERO STUFFING
ZERO STUFFING
200 225 250
200 225 250
200 225 250