AD9747 Analog Devices, AD9747 Datasheet - Page 26

• Manufacturer Part Number: AD9747
• Description: Dual 16-Bit 250 MSPS Digital-to-Analog Converters
• Manufacturer: Analog Devices

Specifications of AD9747

• Resolution (bits): 16bit
• Dac Update Rate: 250MSPS
• Dac Settling Time: n/a
• Max Pos Supply (v): +3.47V
• Single-supply: No
• Dac Type: Current Out
• Dac Input Format: Par

AD9741/AD9743/AD9745/AD9746/AD9747
30
24
18
12
15
13
11
6
0
9
7
5
0
0
25
25
Figure 41. DVDD18 Current vs. f
50
Figure 42. CVDD18 Current vs. f
50
75
75
100
100
f
f
DAC
DAC
AD9747
125
125
(MHz)
(MHz)
150
150
AD9741
175
175
DAC
DAC
200
200
225
225
250
250
Rev. 0 | Page 26 of 28
Figure 43 shows the power consumption for each power supply
domain as well as the total power consumption. Individual bars
within each group display the power in full active mode (blue)
vs. power for five increasing levels of power-down.
The overall power consumption is dominated by AVDD33 and
significant power savings can be achieved simply by disabling
the DAC outputs. Also, disabling the DAC outputs is a signifi-
cant way to conserve power and still maintain a fast wake-up
time. Full power-down disables all circuitry for minimum
power consumption. Note, however, that even in full power-
down, there is a small power draw (25 mW) due to incoming
data activity. To lower power consumption to near zero, all
incoming data activity must be halted.
350
300
250
200
150
100
50
0
Figure 43. Power Dissipation vs. Power-Down Mode
AVDD33
FULL ACTIVE
DCO OFF
AUX OFF
DAC OFF
CLK OFF
BIAS OFF
DVDD18
CVDD18
DVDD33
TOT PWR