參數(shù)資料
型號(hào)： ADL5375-15ACPZ-WP1
廠商： Analog Devices, Inc.
英文描述： 400 MHz to 6 GHz Broadband Quadrature Modulator
中文描述： 400 MHz至6 GHz的寬帶正交調(diào)制器
文件頁數(shù)： 24/32頁
文件大小： 1074K
代理商： ADL5375-15ACPZ-WP1
ADL5375
Rev. 0 | Page 24 of 32
RBIP
50
RBIN
50
93
92
21
22
IBBN
IBBP
AD9779
ADL5375-05
RBQN
50
RBQP
50
83
84
9
10
RSLI
100
RSLQ
100
OUT1_N
OUT1_P
OUT2_P
OUT2_N
QBBP
QBBN
LPI
771.1nH
LNI
771.1nH
53.62nF
C1I
350.1pF
C2I
LNQ
771.1nH
LPQ
771.1nH
53.62nF
C1Q
350.1pF
C2Q
0
Figure 60. DAC Modulator Interface with
10 MHz Third-Order, Bessel Filter
1
10
100
–60
–50
–40
–30
–20
–10
0
0
6
12
18
24
30
36
G
FREQUENCY (MHz)
M
MAGNITUDE
GROUP DELAY
0
Figure 61. Frequency Response for DAC Modulator Interface with
10 MHz Third-Orde,r Bessel Filter
Driving the ADL5375-15 with a TXDAC
The ADL5375-15 requires a 1500 mV dc bias and therefore
requires a slightly more complex interface that performs a dc
level shift on the baseband signals. It is necessary to level-shift
the DAC output from a 500 mV dc bias to the 1500 mV dc bias
that the ADL5375-15 requires.
Level-shifting can be achieved with either a passive network
or an active circuit. A passive network of resistors is shown
in Figure 62. In this network, the dc bias of the DAC remains
at 500 mV while the input to the ADL5375-15 is 1500 mV.
It should be noted that this passive level-shifting network
introduces approximately 2 dB of loss in the ac signal.
RBIP
45.3
RBIN
45.3
93
92
21
22
OUT1_N
OUT1_P
IBBN
IBBP
5V
AD9779
ADL5375-15
RLIP
3480
RLIN
3480
RBQN
45.3
RSQP
1k
RBQP
45.3
84
83
9
10
OUT2_P
OUT2_N
QBBP
QBBN
0
5V
RLQN
3480
RLQP
3480
RSQN
1k
RSIP
1k
RSIN
1k
Figure 62. Passive Level-Shifting Network For Biasing ADL5375-15
from TxDAC
The active level shifting circuit involves the use of the
ADA4938
dual-differential amplifier. This device has a VOCM pin that
sets the output dc bias. Through this pin, the output common-
mode of the amplifier can be easily set to the requisite 1.5 V for
biasing the ADL5375-15 baseband inputs.
USING THE AD9779 AUXILIARY DAC FOR CARRIER
FEEDTHROUGH NULLING
The
AD9779
features an auxiliary DAC that can be used to
inject small currents into the differential outputs for each
main DAC channel. This feature can be used to produce the
small offset voltages necessary to null out the carrier feed-
through from the modulator. Figure 63 shows the interface
required to use the auxiliary DACs, which adds four resistors
to the interface.
RBIP
50
RBIN
50
93
90
92
21
22
IBBN
IBBP
AD9779
ADL5375-05
RBQN
50
RBQP
50
83
84
87
89
86
9
10
RSLI
100
RSLQ
100
OUT1_N
AUX1_N
AUX2_N
OUT1_P
AUX1_P
OUT2_P
AUX2_P
OUT2_N
QBBP
QBBN
LPI
771.1nH
LNI
771.1nH
53.62nF
C1I
350.1pF
C2I
LNQ
771.1nH
LPQ
771.1nH
53.62nF
C1Q
350.1pF
C2Q
250
500
500
500
500
250
250
250
0
Figure 63. DAC Modulator Interface with Auxiliary DAC Resistors
相關(guān)PDF資料
PDF描述
ADL5375-15-EVALZ1 400 MHz to 6 GHz Broadband Quadrature Modulator
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADL5375-15-EVALZ 制造商:Analog Devices 功能描述:400 MHZ TO 6 GHZ BROADBAND QUADRATURE MODULATOR - Bulk
ADL5375-15-EVALZ1 制造商:AD 制造商全稱:Analog Devices 功能描述:400 MHz to 6 GHz Broadband Quadrature Modulator
ADL5375ACPZ-R7 制造商:AD 制造商全稱:Analog Devices 功能描述:400 MHz to 6 GHz Broadband Quadrature Modulator
ADL5380 制造商:AD 制造商全稱:Analog Devices 功能描述:400 MHz to 6 GHz Quadrature Demodulator
ADL5380-29A-EVALZ 功能描述:BOARD EVAL FOR ADL5380-29A RoHS:是 類別:RF/IF 和 RFID >> RF 評(píng)估和開發(fā)套件，板 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:GPS 接收器 頻率:1575MHz 適用于相關(guān)產(chǎn)品:- 已供物品:模塊 其它名稱:SER3796
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