AD5410 Analog Devices, AD5410 Datasheet - Page 26

• Manufacturer Part Number: AD5410
• Description: Single-Channel, 12-/16-Bit, Serial Input, 4 mA to 20 mA, Current Source DAC
• Manufacturer: Analog Devices

Specifications of AD5410

• Resolution (bits): 12bit
• Max Pos Supply (v): +26.4V
• Dac Input Format: SPI

AD5410/AD5420
MICROPROCESSOR INTERFACING
Microprocessor interfacing to the AD5410/AD5420 is via a serial
bus that uses a protocol compatible with microcontrollers and
DSP processors. The communication channel is a 3-wire (mini-
mum) interface consisting of a clock signal, a data signal, and a
latch signal. The AD5410/AD5420 require a 24-bit data-word
with data valid on the rising edge of SCLK.
For all interfaces, the DAC output update is initiated on the
rising edge of LATCH. The contents of the registers can be read
using the readback function.
THERMAL AND SUPPLY CONSIDERATIONS
The AD5410/AD5420 are designed to operate at a maximum
junction temperature of 125°C. It is important that the device
not be operated under conditions that cause the junction tempera-
ture to exceed this value. Excessive junction temperature can
occur if the AD5410/AD5420 are operated from the maximum
AV
ground. In this case, the ambient temperature should be controlled
or AV
At the maximum ambient temperature of 85°C, the 24-lead
TSSOP can dissipate 950 mW, and the 40-Lead LFCSP can
dissipate 1.42 W.
To ensure that the junction temperature does not exceed 125°C
while driving the maximum current of 24 mA directly into
ground (also adding an on-chip current of 4 mA), AV
be reduced from the maximum rating to ensure that the
package is not required to dissipate more power than previously
stated (see Table 21, Figure 51, and Figure 52).
Table 21. Thermal and Supply Considerations
Consideration
Maximum Allowed Power
Dissipation When Operating at
an Ambient Temperature of 85°C
Maximum Allowed Ambient
Temperature When Operating
from a Supply of 40 V/60 V and
Driving 24 mA Directly to Ground
Maximum Allowed Supply
Voltage When Operating at an
Ambient Temperature of 85°C
and Driving 24 mA Directly to
Ground
DD
, while driving the maximum current (24 mA) directly to
DD
should be reduced.
TSSOP
T
J T
T
AI
J
J
DD
max
max
max
Θ
JA
×
−
−
−
Θ
P
T
T
JA
D
A
A
×
=
=
Θ
125
. 0
JA
125
028
DD
42
=
−
−
should
×
85
125
85
42
Rev. C | Page 26 of 28
=
−
=
950
(
34
40
mW
V
×
. 0
028
)
×
42
Figure 51. Maximum Power Dissipation vs. Ambient Temperature
=
Figure 52. Maximum Supply Voltage vs. Ambient Temperature
2.5
2.0
1.5
1. 0
0.5
65
60
55
50
45
40
35
30
25
0
78
40
25
°
C
45
35
LFCSP
T
J T
T
AI
J
J
50
max
DD
max
max
Θ
AMBIENT TEMPERATURE (°C)
AMBIENT TEMPERATURE (°C)
JA
×
55
45
−
−
−
Θ
P
TSSOP
T
T
LFCSP
D
JA
A
A
×
60
TSSOP
LFCSP
=
=
Θ
55
JA
125
. 0
125
028
65
=
28
−
125
−
×
85
85
28
70
65
−
=
(
=
. 1
60
42
51
75
×
. 0
75
W
V
028
80
)
×
28
85
85
=
78
°
C