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參數(shù)資料
| 型號： | AD6653-125EBZ |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | IF Diversity Receiver |
| 中文描述： | IF分集接收機 |
| 文件頁數(shù)： | 25/80頁 |
| 文件大?。?/td> | 1998K |
| 代理商： | AD6653-125EBZ |
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AD6653
Differential Input Configurations
Optimum performance is achieved while driving the AD6653 in a
differential input configuration. For baseband applications, the
AD8138
,
ADA4937-2
, and
ADA4938-2
differential drivers provide
excellent performance and a flexible interface to the ADC. The
output common-mode voltage of the AD8138 is easily set with
the CML pin of the AD6653 (see Figure 47), and the driver can
be configured in a Sallen-Key filter topology to provide band
limiting of the input signal.
Rev. 0 | Page 25 of 80
AVDD
1V p-p
49.9
523
0.1μF
R
R
C
499
499
499
AD8138
AD6653
VIN+
VIN–
CML
0
Figure 47. Differential Input Configuration Using the AD8138
For baseband applications where SNR is a key parameter,
differential transformer coupling is the recommended input
configuration. An example is shown in Figure 48. To bias the
analog input, the CML voltage can be connected to the center
tap of the secondary winding of the transformer.
2V p-p
49.9
0.1μF
R
R
C
AD6653
VIN+
VIN–
CML
0
Figure 48. Differential Transformer-Coupled Configuration
The signal characteristics must be considered when selecting
a transformer. Most RF transformers saturate at frequencies
below a few megahertz (MHz). Excessive signal power can also
cause core saturation, which leads to distortion.
At input frequencies in the second Nyquist zone and above, the
noise performance of most amplifiers is not adequate to achieve
the true SNR performance of the AD6653. For applications where
SNR is a key parameter, differential double balun coupling is
the recommended input configuration (see Figure 49).
An alternative to using a transformer coupled input at frequencies
in the second Nyquist zone is to use the
AD8352
differential
driver, as shown in Figure 50. See the
AD8352
data sheet for
more information. In addition, if the application requires an
amplifier with variable gain, the
AD8375
or
AD8376
digital
variable gain amplifiers (DVGAs) provide good performance
driving the AD6653.
In any configuration, the value of the shunt capacitor, C, is
dependent on the input frequency and source impedance and
may need to be reduced or removed. Table 10 displays
recommended values to set the RC network. However, these
values are dependent on the input signal and should be used
only as a starting guide.
Table 10. Example RC Network
Frequency Range (MHz)
0 to 70
70 to 200
200 to 300
>300
R Series
(Ω Each)
33
33
15
15
C Differential (pF)
15
5
5
Open
AD6653
R
0.1μF
0.1μF
2V p-p
VIN+
VIN–
CML
C
R
0.1μF
S
0.1μF
25
25
S
P
A
P
0
Figure 49. Differential Double Balun Input Configuration
AD6653
AD8352
0
R
0
C
D
R
D
R
G
0.1μF
0.1μF
0.1μF
VIN+
VIN–
CML
C
0.1μF
16
1
2
3
4
5
11
R
0.1μF
0.1μF
10
14
0.1μF
8, 13
V
CC
200
200
ANALOG INPUT
ANALOG INPUT
0
Figure 50. Differential Input Configuration Using the AD8352
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD6653BCPZ-125 | IF Diversity Receiver |
| AD6653BCPZ-150 | IF Diversity Receiver |
| AD6655BCPZ-1251 | IF Diversity Receiver |
| AD6655 | IF Diversity Receiver |
| AD6655-125EBZ1 | IF Diversity Receiver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD6653-150EBZ | 制造商:Analog Devices 功能描述:EVAL BD FOR AD6653 - Bulk |
| AD6653BCPZ-125 | 制造商:Analog Devices 功能描述:IF DIVERSITY RCVR 64LFCSP EP - Trays 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述:IC RECEIVER IF DIVERSITY LFCSP64 |
| AD6653BCPZ-150 | 制造商:Analog Devices 功能描述:IF DIVERSITY RCVR 64LFCSP EP - Trays 制造商:Analog Devices 功能描述:IC RECEIVER IF DIVERSITY LFCSP64 制造商:Analog Devices 功能描述:IC, RECEIVER, IF DIVERSITY, LFCSP64 |
| AD6654 | 制造商:Analog Devices 功能描述:- Bulk |
| AD6654/PCB | 制造商:AD 制造商全稱:Analog Devices 功能描述:14-Bit, 92.16 MSPS, 4-/6-Channel Wideband IF to Baseband Receiver |
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