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參數(shù)資料
| 型號： | AD8349AREZ-RL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 調(diào)制器/解調(diào)器 |
| 英文描述： | 700 MHz - 2700 MHz RF/MICROWAVE QPSK MODULATOR |
| 封裝： | MO-153ABT, TSSOP-16 |
| 文件頁數(shù)： | 16/28頁 |
| 文件大?。?/td> | 729K |
| 代理商： | AD8349AREZ-RL7 |
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AD8349
Rev. A | Page 23 of 28
SOLDERING INFORMATION
The AD8349 is available in a 16-lead TSSOP package with an
exposed paddle. The exposed paddle must be soldered to the
exposed metal of a ground plane for a lowered thermal
impedance and reduced inductance to ground. This results in a
junction-to-air thermal impedance (θJA) of 30°C/W. If multiple
ground planes are present, the area under the exposed paddle
should be stitched together with vias.
LO GENERATION USING PLLS
Analog Devices has a line of PLLs that can be used for
generating the LO signal. Table 4 lists the PLLs together with
their maximum frequency and phase noise performance.
Table 4. ADI PLL Selection Table
ADI Model
Frequency FIN
(MHz)
At 1 kHz Phase Noise
dBc/Hz, 200 kHz PFD
ADF4111BRU
1200
–78
ADF4111BCP
1200
–78
ADF4112BRU
3000
–86
ADF4112BCP
3000
–86
ADF4117BRU
1200
–87
ADF4118BRU
3000
–90
Analog Devices also offers the ADF4360 fully integrated
synthesizer and VCO on a single chip that offers differential
outputs for driving the local oscillator input of the AD8349.
This means that the user can eliminate the use of the balun
necessary for the single-ended-to-differential conversion. The
ADF4360 comes as a family of chips with six operating
frequency ranges. One can be chosen depending on the local
oscillator frequency required. The user should be aware that
while the use of the integrated synthesizer might come at the
expense of slightly degraded noise performance from the
AD8349, it can be a much cheaper alternative to a separate PLL
and VCO solution. Figure 61 shows the options available.
Table 5. ADF4360 Family Operating Frequencies
ADI Model
Output Frequency Range (MHz)
ADF4360-1
2150/2450
ADF4360-2
1800/2150
ADF4360-3
1550/1950
ADF4360-4
1400/1800
ADF4360-5
1150/1400
ADF4360-6
1000/1250
ADF4360-7
Lower frequencies set by external L
TRANSMIT DAC OPTIONS
The AD9777 recommended in the previous sections of this data
sheet is by no means the only DAC that can be used to drive the
AD8349. There are other DACs that are appropriate, depending
on the level of performance required. Table 6 lists the dual
Tx-DACs that ADI offers.
Table 6. ADI Dual Tx – DAC Selection Table
Part
Resolution (Bits)
Update Rate (MSPS Min)
AD9709
8
125
AD9761
10
40
AD9763
10
125
AD9765
12
125
AD9767
14
125
AD9773
12
160
AD9775
14
160
AD9777
16
160
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