AD5420BCPZ AD [Analog Devices], AD5420BCPZ Datasheet - Page 26

• Manufacturer Part Number: AD5420BCPZ
• Description: Single Channel, 16-Bit, Serial Input, Current Source DAC
• Manufacturer: AD [Analog Devices]

AD5420
THERMAL AND SUPPLY CONSIDERATIONS
The AD5420 is designed to operate at a maximum junction
temperature of 125°C. It is important that the device is not
operated under conditions that will cause the junction
temperature to exceed this value . Excessive junction
temperature can occur if the AD5420 is operated from the
maximum AV
directly to ground. In this case the ambient temperature should
be controlled or AV
depend on the device and package.
Table 21. Thermal and Supply considerations for each package
Maximum allowed power dissipation
when operating at an ambient
temperature of 85°C
Maximum allowed ambient
temperature when operating from a
supply of 40V/60V and driving 24mA
directly to ground.
Maximum allowed supply voltage
when operating at an ambient
temperature of 85°C and driving 24mA
directly to ground.
Figure 40. Maximum Power Dissipation Vs Ambient Temperature
2.5
1.5
0.5
2
1
0
40
DD
45
and driving the maximum current (24mA)
DD
50
should be reduced. The conditions will
55
Ambient Temperature (°C)
60
65
TSSOP
T
J T
T
AI
J
J
max
DD
max
max
Θ
70
JA
×
−
−
−
Θ
P
T
T
D
JA
A
75
A
×
=
=
Θ
125
. 0
JA
80
125
027
TSSOP
LFCSP
42
−
=
−
85
125
×
85
85
Rev. PrD | Page 26 of 29
42
=
−
950
=
(
40
35
mW
V
×
. 0
027
)
At maximum ambient temperature of 85°C the AD5420BREZ
(24-lead TSSOP) can dissipate 950mW and the AD5420BCPZ
(40-lead LFCSP) can dissipate 1.42W.
To ensure the junction temperature does not exceed 125°C
while driving the maximum current of 24mA directly into
ground (also adding an on-chip current of 3mA), AV
be reduced from the maximum rating to ensure the package is
not required to dissipate more power than stated above. See
Table 21, Figure 40 and Figure 41.
×
42
Figure 41. Maximum Supply Voltage Vs Ambient Temperature
65
60
55
50
45
40
35
30
25
=
25
79
°
C
35
LFCSP
T
J T
AI
Preliminary Technical Data
T
J
J
max
DD
max
45
max
Θ
JA
−
×
Ambient Temperature (°C)
−
−
P
Θ
T
D
T
JA
A
A
×
55
=
Θ
=
JA
125
. 0
125
027
=
28
−
125
−
85
65
×
85
−
28
=
(
60
. 1
=
42
×
53
W
TSSOP
LFCSP
. 0
75
V
027
)
DD
×
28
should
85
=
79
°
C