AD9125 Analog Devices, AD9125 Datasheet - Page 46

• Manufacturer Part Number: AD9125
• Manufacturer: Analog Devices

Specifications of AD9125

• Resolution (bits): 16bit
• Dac Update Rate: 1GSPS
• Dac Settling Time: n/a
• Max Pos Supply (v): +3.47V
• Single-supply: No
• Dac Type: Current Out
• Dac Input Format: Par

AD9125
Figure 79. DVDD18 Power Dissipation vs. f
Figure 80. DVDD18 Power Dissipation vs. f
300
250
200
150
100
300
250
200
150
100
50
50
0
0
50
0
200
100
400
2×, 4×, 8×
150
f
f
DATA
DAC
1×
600
(MHz)
(MHz)
200
DAC
800
Due to Inverse Sinc Filter
DATA
Due to Fine NCO
250
1000
1200
300
Rev. 0 | Page 46 of 56
TEMPERATURE SENSOR
The AD9125 has a diode-based temperature sensor for measuring
the temperature of the die. The temperature reading is accessed
through Register 0x49 and Register 0x4A. The temperature of
the die can be calculated by
where T
accuracy is ±5
Estimates of the ambient temperature can be made if the power
dissipation of the device is known. For example, if the device power
dissipation is 800 mW and the measured die temperature is 50
then the ambient temperature can be calculated as
where:
T
T
P
T
AD9125, as shown in Table 7.
To use the temperature sensor, it must be enabled by setting
Register 0x01, Bit 4, to 0. In addition, to obtain accurate readings,
the range control register (Register 0x48) should be set to 0x02.
D
A
DIE
JA
is the ambient temperature in
is the power dissipation.
is the thermal resistance from junction to ambient of the
is the die temperature in
T
T
A
DIE
= T
DIE
=
is the die temperature in
DIE
(
Die
o
– P
C typical.
Temp
D
× T
[
JA
15
88
= 50 – 0.8 × 20.7 = 33.4°C
:
] 0
−
o
C.
47
,
925
o
C.
o
)
C. The temperature
o
C,