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| 型號： | AD9641-155KITZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 10/36頁 |
| 文件大?。?/td> | 0K |
| 描述： | KIT EVAL FOR AD9641 |
| 設(shè)計資源： | AD9641 Gerber Files |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | * |
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AD9641
Data Sheet
Rev. B | Page 18 of 36
The output common-mode voltage of the ADA4938-2 is easily
set with the VCM pin of the AD9641 (see Figure 49), and the
driver can be configured in a Sallen-Key filter topology to provide
band limiting of the input signal.
VIN
76.8
120
0.1F
200
90
AVDD
33
15
5pF
15pF
ADC
VIN–
VIN+
VCM
ADA4938-2
092
10-
0
31
Figure 49. Differential Input Configuration Using the ADA4938-2
For baseband applications in which SNR is a key parameter,
differential transformer coupling is the recommended input
configuration. An example is shown in Figure 50. To bias the
analog input, the voltage of VCM can be connected to the
center tap of the secondary winding of the transformer.
2V p-p
49.9
0.1F
R1
C1
ADC
VIN+
VIN–
VCM
C2
R2
R3
R2
C2
R3
09
21
0-
0
32
Figure 50. 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 AD9641. For applications where
SNR is a key parameter, differential double balun coupling is the
recommended input configuration (see Figure 51). In this configu-
ration, the input is ac-coupled, and the common-mode voltage
(VCM) is provided to each input through a 33 Ω resistor. These
resistors compensate for losses in the input baluns to provide
a 50 Ω impedance to the driver.
In the double balun and transformer configurations, the value
of the input capacitors and resistors is dependent on the input
frequency and source impedance. Based on these parameters,
the value of the input resistors and capacitors may need to be
adjusted, or some components may need to be removed. Table 9
displays recommended values to set the RC network for different
input frequency ranges. However, these values are dependent on
the input signal and bandwidth and should be used only as
a starting guide.
An alternative to using a transformer-coupled input at frequencies
in the second Nyquist zone is to use the AD8376 variable gain
amplifier. An example drive circuit including a band-pass filter
is shown in Figure 52. See the AD8376 data sheet for more
information.
ADC
R1
0.1F
2V p-p
VIN+
VIN–
VCM
C1
C2
R1
R2
0.1F
S
0.1F
C2
33
S
PA
P
R3
09210
-03
3
Figure 51. Differential Double Balun Input Configuration
Table 9. Example RC Network
Frequency Range (MHz)
R1 Series (Ω Each)
C1 Differential (pF)
R2 Series (Ω Each)
C2 Shunt (pF Each)
R3 Shunt (Ω Each)
0 to 100
33
8.2
0
8.2
49.9
100 to 250
15
3.9
0
Open
AD8376
AD9641
1H
1nF
VPOS
VCM
15pF
68nH
301
165
5.1pF
3.9pF
180nH
1000pF
NOTES
1. ALL INDUCTORS ARE COILCRAFT 0603CS COMPONENTS
WITH THE EXCEPTION OF THE 1H CHOKE INDUCTORS (0603LS).
2. FILTER VALUES SHOWN ARE FOR A 20MHz BANDWIDTH FILTER
CENTERED AT 140MHz.
180nH
220nH
09210-
034
Figure 52. Differential Input Configuration Using the AD8376
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