AD5755 Analog Devices, AD5755 Datasheet - Page 45

• Manufacturer Part Number: AD5755
• Description: Quad Channel, 16-Bit, Serial Input,
• Manufacturer: Analog Devices

Specifications of AD5755

• Resolution (bits): 16bit
• Dac Update Rate: 91kSPS
• Dac Settling Time: 11µs
• Max Pos Supply (v): +33V
• Single-supply: No
• Dac Type: I or V Out
• Dac Input Format: SPI

Data Sheet
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
Figure 82. AI
Figure 81. AI
0
0
0
0
0mA TO 24mA RANGE
1kΩ LOAD
f
INDUCTOR = 10µH (XAL4040-103)
T
SW
A
= 25°C
= 410kHz
with External 51 kΩ Compensation Resistor
with External 51 kΩ Compensation Resistor
AI
I
V
CC
OUT
CC
0.5
0.5
BOOST
CC
Current vs. Time for 24 mA Step Through 500 Ω Load
Current vs. Time for 24 mA Step Through 1 kΩ Load
1.0
1.0
TIME (ms)
TIME (ms)
AI
I
V
INDUCTOR = 10µH (XAL4040-103)
OUT
BOOST
CC
1.5
1.5
0mA TO 24mA RANGE
f
SW
2.0
2.0
500Ω LOAD
T
= 410kHz
A
= 25°C
2.5
2.5
32
28
24
20
16
12
8
4
0
32
28
24
20
16
12
8
4
0
Rev. A | Page 45 of 52
Using slew rate control can greatly reduce the AV
current requirements, as shown in Figure 83. When using slew
rate control, attention should be paid to the fact that the output
cannot slew faster than the dc-to-dc converter. The dc-to-dc
converter slews slowest at higher currents through large (for
example, 1 kΩ) loads. This slew rate is also dependent on the
dc-to-dc converter configuration. Two examples of the dc-to-dc
converter output slew are shown in Figure 81 and Figure 82
(V
BOOST
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
Figure 83. AI
0
0
corresponds to the dc-to-dc converter’s output voltage).
0mA TO 24mA RANGE
1kΩ LOAD
f
INDUCTOR = 10µH (XAL4040-103)
T
SW
A
AI
I
V
= 25°C
OUT
BOOST
= 410kHz
1
CC
CC
Current vs. Time for 24 mA Step Through 1 kΩ Load
2
with Slew Rate Control
TIME (ms)
3
4
5
CC
supplies
AD5755
6
32
28
24
20
16
12
8
4
0