Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

ADL5375-05ACPZ-WP Datasheet(PDF) 26 Page - Analog Devices

Part No. ADL5375-05ACPZ-WP
Description  400 MHz to 6 GHz Broadband Quadrature Modulator
Download  36 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  AD [Analog Devices]
Homepage  http://www.analog.com
Logo 

ADL5375-05ACPZ-WP Datasheet(HTML) 26 Page - Analog Devices

Zoom Inzoom in Zoom Outzoom out
 26 / 36 page
background image
ADL5375
Data Sheet
Rev. C | Page 26 of 36
1
0
–1
–2
–3
–4
–5
–6
1
10
100
1k
BASEBAND FREQUENCY (MHz)
Figure 64. ADL5375-15 Baseband Frequency Response Normalized to
Response for 1 MHz
In CIF applications, a low-pass filter between the DAC and
modulator is still favored to filter out images, noises discussed
in the Filtering section as well as to preserve dc bias level from
DAC to ADL5375-05. Figure 65 shows a fifth order Butterworth
filter with a 300 MHz corner frequency and the frequency
response of this filter is shown in Figure 66.
Even a purely differential filter can work well, splitting the filter
capacitors into two and grounding at filter topology as like C2
and C4 in Figure 65 divert common mode currents to ground
and result in additional common-mode rejection of high
frequency signals to a purely differential filter.
67
66
IBBN
IBBP
AD9122
ADL5375-05
59
58
21
22
9
10
IOUT1N
IOUT1P
IOUT2
IOUT2N
QBBP
QBBN
RBIP
50Ω
RBIN
50Ω
RBQN
50Ω
RBQP
50Ω
RSLI
100Ω
RSLQ
100Ω
C3I
6pF
C3Q
6pF
C1I
3.6pF
C1Q
3.6pF
L1PI
33nH
L1NI
33nH
L2PI
33nH
L2NI
33nH
L1NQ
33nH
L1PQ
33nH
C2PI
22pF
C2NI
22pF
C4PI
3pF
C4NI
3pF
L2NQ
33nH
L2PQ
33nH
C2NQ
22pF
C2PQ
22pF
C4NQ
3pF
C4PQ
3pF
Figure 65. Recommended DAC Modulator Interface Topology with
FC = 300 MHz Fifth-Order, Butterworth Filter
0
–25
–20
–15
–10
–5
1M
500M
100M
10M
FREQUENCY (Hz)
4.0
0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
Figure 66. Frequency Response for DAC Modulator Interface with 300 MHz
Fifth-Order Butterworth 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 67. 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.
67
66
IBBN
IBBP
AD9122
ADL5375-15
59
58
21
22
9
10
IOUT1N
IOUT1P
IOUT2
IOUT2N
QBBP
QBBN
RBIP
45.3Ω
RBIN
45.3Ω
RBQN
45.3Ω
RBQP
45.3Ω
RLIP
3480Ω
RLIN
3480Ω
RLQN
3480Ω
RLQP
3480Ω
RSIN
1kΩ
RSIP
1kΩ
RSQN
1kΩ
RSQP
1kΩ
5V
5V
Figure 67. 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.


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36 


Datasheet Download




Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn