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參數(shù)資料
| 型號： | ADL5371ACPZ-R2 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 調(diào)制器/解調(diào)器 |
| 英文描述： | 700 MHz - 1300 MHz RF/MICROWAVE QUADRAPHASE MODULATOR |
| 封裝： | LEAD FREE, MO-220VGGD-2, LFCSP-24 |
| 文件頁數(shù)： | 5/20頁 |
| 文件大?。?/td> | 930K |
| 代理商： | ADL5371ACPZ-R2 |
ADL5371
Rev. 0 | Page 13 of 20
APPLICATIONS INFORMATION
DAC MODULATOR INTERFACING
The ADL5371 is designed to interface with minimal components
to members of the Analog Devices family of DACs. These DACs
feature an output current swing from 0 to 20 mA, and the
interface described in this section can be used with any DAC
that has a similar output.
Driving the ADL5371 with a TxDAC
An example of the interface using the AD9779 TxDAC is shown
in Figure 27. The baseband inputs of the ADL5371 require a dc
bias of 500 mV. The average output current on each AD9779
output is 10 mA. Therefore, a single 50 Ω resistor to ground
from each DAC output results in an average current of 10 mA
flowing through each resistor, thus producing the desired
500 mV dc bias for the inputs to the ADL5371.
RBIP
50
RBIN
50
93
92
19
20
OUT1_N
OUT1_P
IBBN
IBBP
AD9779
F-MOD
RBQN
50
RBQP
50
84
83
23
24
OUT2_P
OUT2_N
QBBP
QBBN
06
51
0-
0
28
Figure 27. Interface Between the AD9779 and ADL5371 with 50 Ω Resistors to
Ground to Establish the 500 mV dc Bias for the ADL5371 Baseband Inputs
The AD9779 output currents have a swing that ranges from 0 to
20 mA. With the 50 Ω resistors in place, the ac voltage swing
going into the ADL5371 baseband inputs ranges from 0 V to 1 V.
A full-scale sine wave out of the AD9779 can be described as a
1 V p-p single-ended (or 2 V p-p differential) sine wave with a
500 mV dc bias.
LIMITING THE AC SWING
There are situations when it is desirable to reduce the ac voltage
swing for a given DAC output current. This can be achieved
through the addition of another resistor to the interface. This
resistor is placed in shunt between each side of the differential
pair, as shown in Figure 28. It has the effect of reducing the ac
swing without changing the dc bias already established by the
50 Ω resistors.
RBIP
50
RBIN
50
93
92
19
20
IBBN
IBBP
AD9779
F-MOD
RBQN
50
RBQP
50
84
83
23
24
RSLI
100
RSLQ
100
OUT1_N
OUT1_P
OUT2_P
OUT2_N
QBBP
QBBN
06
51
0-
0
29
Figure 28. AC Voltage Swing Reduction Through the Introduction
of a Shunt Resistor Between the Differential Pair
The value of this ac voltage swing-limiting resistor is chosen
based on the desired ac voltage swing. Figure 29 shows the
relationship between the swing-limiting resistor and the peak-
to-peak ac swing that it produces when 50 Ω bias-setting
resistors are used.
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
10
100
1000
10000
D
IFF
E
R
E
N
TI
A
L
S
W
IN
G
(
V
p-
p
)
RL ()
065
10
-03
0
Figure 29. Relationship Between the AC Swing-Limiting Resistor and the
Peak-to-Peak Voltage Swing with 50 Ω Bias-Setting Resistors
FILTERING
It is necessary to low-pass filter the DAC outputs to remove
images when driving a modulator. The interface for setting up
the biasing and ac swing discussed in the Limiting the AC
Swing section lends itself well to the introduction of such a
filter. The filter can be inserted between the dc bias-setting
resistors and the ac swing-limiting resistor. Doing so establishes
the input and output impedances for the filter.
相關PDF資料 |
PDF描述 |
|---|---|
| ADL5372ACPZ-R2 | 1500 MHz - 2500 MHz RF/MICROWAVE QUADRAPHASE MODULATOR |
| ADL5375ACPZ-15-WP | 400 MHz - 6000 MHz RF/MICROWAVE QUADRAPHASE MODULATOR |
| ADL5375ACPZ-15-R7 | 400 MHz - 6000 MHz RF/MICROWAVE QUADRAPHASE MODULATOR |
| ADL5375ACPZ-05-WP | 400 MHz - 6000 MHz RF/MICROWAVE QUADRAPHASE MODULATOR |
| ADL5375ACPZ-05-R7 | 400 MHz - 6000 MHz RF/MICROWAVE QUADRAPHASE MODULATOR |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADL5371ACPZ-R7 | 功能描述:IC MOD QUAD 500-1500 MHZ 24LFCSP RoHS:是 類別:RF/IF 和 RFID >> RF 調(diào)制器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 功能:調(diào)制器 LO 頻率:700MHz ~ 2.3GHz RF 頻率:700MHz ~ 2.3GHz P1dB:1dBm 底噪:-148dBm/Hz 輸出功率:-1dBm 電流 - 電源:46mA 電源電壓:2.7 V ~ 3.6 V 測試頻率:1.75GHz 封裝/外殼:28-WFQFN 裸露焊盤 包裝:帶卷 (TR) |
| ADL5371ACPZ-WP | 制造商:Analog Devices 功能描述:QUADRATURE MOD 700MHZ 24LFCSP EP - Waffle Pack |
| ADL5371-EVALZ | 制造商:Analog Devices 功能描述:EVAL BOARD - Bulk |
| ADL5372 | 制造商:AD 制造商全稱:Analog Devices 功能描述:400 MHz to 6 GHz Broadband Quadrature Modulator |
| ADL5372ACPZ-R2 | 制造商:Analog Devices 功能描述:1500 MHZ TO 2500 MHZ QUADRATURE MODULATOR - Tape and Reel |
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