AD9122 Analog Devices, AD9122 Datasheet - Page 51

• Manufacturer Part Number: AD9122
• Manufacturer: Analog Devices

Specifications of AD9122

• Resolution (bits): 16bit
• Dac Update Rate: 1.23GSPS
• Dac Settling Time: n/a
• Max Pos Supply (v): +3.47V
• Single-supply: No
• Dac Type: Current Out
• Dac Input Format: LVDS,Par

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
1× INTERPOLATION
2×, 4×, 8× INTERPOLATION
200
100
400
150
f
f
DATA
DAC
600
(MHz)
(MHz)
200
DAC
800
Due to Inverse Sinc Filter
DATA
Due to Fine NCO
250
1000
1200
300
Rev. B | Page 51 of 60
TEMPERATURE SENSOR
The AD9122 has a band gap temperature sensor for monitoring
the temperature change of the AD9122. The temperature must
be calibrated against a known temperature to remove the part-
to-part variation on the band gap circuit used to sense the
temperature. The DACCLK must be running at a minimum
of 100 MHz to obtain a reliable temperature measurement.
To monitor temperature change, the user must take a reading
at a known ambient temperature for a single-point calibration
of each AD9122 device.
where:
Code_x is the readback code at the unknown temperature, Tx.
Code_ref is the readback code at the calibrated temperature, T
To use the temperature sensor, it must be enabled by setting
Register 0x01, Bit 4, to 0. In addition, to obtain accurate read-
ings, the die temperature range control register (Register 0x48)
should be set to 0x02.
Tx = T
REF
+ 7.7 × (Code_x − Code_ref)/1000 + 1
AD9122
REF
.