參數(shù)資料
型號(hào)： AD6655BCPZ-1501
廠商： Analog Devices, Inc.
英文描述： IF Diversity Receiver
中文描述： IF分集接收機(jī)
文件頁(yè)數(shù)： 30/84頁(yè)
文件大?。?/td> 2012K
代理商： AD6655BCPZ-1501
AD6655
An on-board common-mode voltage reference is included in
the design and is available from the CML pin. Optimum perform-
ance is achieved when the common-mode voltage of the analog
input is set by the CML pin voltage (typically 0.55 × AVDD).
Differential Input Configurations
Optimum performance is achieved while driving the AD6655
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 AD6655 (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 30 of 84
AVDD
1V p-p
49.9
523
0.1μF
R
R
C
499
499
499
AD8138
AD6655
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
AD6655
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 AD6655. 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 is 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 AD6655.
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 14 displays recom-
mended 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 14. 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
AD6655
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
AD6655
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
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