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參數(shù)資料
| 型號(hào)： | AD8345AREZ-RL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類(lèi)： | 調(diào)制器/解調(diào)器 |
| 英文描述： | 140 MHz - 1000 MHz RF/MICROWAVE QUADRAPHASE MODULATOR |
| 封裝： | LEAD FREE, MO-153ABT, TSSOP-16 |
| 文件頁(yè)數(shù)： | 4/20頁(yè) |
| 文件大?。?/td> | 1013K |
| 代理商： | AD8345AREZ-RL7 |
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AD8345
Rev. B | Page 12 of 20
BASIC CONNECTIONS
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
AD8345
QBBP
QBBN
COM3
VPS2
VOUT
COM2
COM3
IBBP
IBBN
COM3
COM1
LOIN
LOIP
VPS1
ENBL
IP
1
T1
ETC1-1-13
2
3
4
5
LO
R1
50
Ω
C6
1000pF
C7
1000pF
IN
C3
1000pF
C4
0.01
μF
+VS
QP
QN
C1
1000pF
C2
0.01
μF
+VS
VOUT
C5
1000pF
009
32-
028
Figure 28. Basic Connections
The basic connections for operating the AD8345 are shown in
Figure 28. A single power supply of between 2.7 V and 5.5 V is
applied to the VPS1 pin and the VPS2 pin. A pair of ESD
protection diodes is connected internally between the VPS1 pin
and the VPS2 pin so these must be tied to the same potential.
Both pins should be individually decoupled using 1000 pF and
0.01 μF capacitors, located as close as possible to the device. For
normal operation, the enable pin (ENBL) must be pulled high.
The turn-on threshold for ENBL is VS/2. COM1 to COM3
should all be tied to the same low impedance ground plane.
LO DRIVE
In Figure 28, a 50 Ω resistor to ground combines with the
device’s high input impedance to provide an overall input
impedance of approximately 50 Ω (see Figure 19 for a plot of
LO port input impedance). For maximum LO suppression at
the output, a differential LO drive is recommended. In
Figure 28, this is achieved using a balun (M/A-COM part
number ETC1-1-13).
The outputs of the balun are ac-coupled to the LO inputs, which
have a bias level of approximately 1.8 V dc. An LO drive level of
2 dBm is recommended for lowest output noise. Higher levels
degrade linearity while lower levels tend to increase the noise
floor slightly. For example, reducing the LO power from 2 dBm
to 10 dBm increases the noise floor by approximately 0.3 dB
(see Figure 21).
The LO input pins can be driven single-ended at the expense of
slightly higher LO leakage. LOIN is ac-coupled to ground using
a capacitor and LOIP is driven through a coupling capacitor
from a (single-ended) 50 Ω source. (This scheme could also be
reversed with the drive signal being applied to LOIN.)
LO FREQUENCY RANGE
The frequency range on the LO input is limited by the internal
quadrature phase splitter. The phase splitter generates drive
signals for the internal mixers which are 90° out of phase
relative to one another.
Outside of the specified LO frequency range of 140 MHz to 1 GHz,
this quadrature accuracy degrades, resulting in decreased sideband
suppression. See Figure 11 for a plot of sideband suppression vs.
LO frequency from 250 MHz to 1 GHz. Figure 29 shows the
sideband suppression of a typical device from 70 MHz to 300 MHz.
LO FREQUENCY (MHz)
40
S
IDE
BAND
S
UP
P
RE
S
IO
N
(d
Bc)
60
80 100 120 140 160 180 200 220 240 260 280 300
–50
–45
–40
–35
–30
–25
–20
–15
–10
–5
VS = 5V, DIFFERENTIAL INPUT = 1.2V
00
932
-0
29
0
Figure 29. Typical Lower Frequency Sideband Suppression Performance
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PDF描述 |
|---|---|
| AD8345AREZ-REEL7 | 140 MHz - 1000 MHz RF/MICROWAVE QUADRAPHASE MODULATOR |
| AD8346ARUZ-REEL | 800 MHz - 2500 MHz RF/MICROWAVE I/Q MODULATOR |
| AD8346ARUZ-REEL7 | 800 MHz - 2500 MHz RF/MICROWAVE I/Q MODULATOR |
| AD8347ARUZ | 800 MHz - 2700 MHz RF/MICROWAVE QUADRAPHASE DEMODULATOR |
| AD8347ARUZ-REEL7 | 800 MHz - 2700 MHz RF/MICROWAVE QUADRAPHASE DEMODULATOR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8345-EVAL | 制造商:Analog Devices 功能描述:AD8345 EVALUATION BOARD - Bulk |
| AD8345-EVALZ | 制造商:Analog Devices 功能描述:EVAL KIT FOR 140 MHZ TO 1000 MHZ QUADRATURE MODULATOR - Bulk |
| AD8346 | 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:300 MHz to 1000 MHz Quadrature Modulator |
| AD8346AF-EMX | 制造商:Analog Devices 功能描述:- Rail/Tube |
| AD8346ARU | 功能描述:IC QUADRATURE MOD .8GHZ 16-TSSOP RoHS:否 類(lèi)別:RF/IF 和 RFID >> RF 調(diào)制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)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(cè)試頻率:1.75GHz 封裝/外殼:28-WFQFN 裸露焊盤(pán) 包裝:帶卷 (TR) |
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