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ADMV8818SCCZ-EP-R2 数据表(PDF) 14 Page - Analog Devices

部件名 ADMV8818SCCZ-EP-R2
功能描述  2 GHz to 18 GHz, Digitally Tunable, High-Pass and Low-Pass Filter
PDF  36 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADMV8818SCCZ-EP-R2 数据表(HTML) 14 Page - Analog Devices

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ADMV8818-EP
Enhanced Product
Rev. A | Page 14 of 36
THEORY OF OPERATION
CHIP ARCHITECTURE
The ADMV8818-EP is a highly flexible filter that can achieve
tunable band-pass, high-pass, low-pass, all pass, or all reject
responses from 2 GHz to 18 GHz. Due to the flexible architecture
of the ADMV8818-EP with four SP5T switches coupled with
digitally tunable high-pass and low-pass filter arrays, the device
provides full coverage over the frequency band without any
dead zones. Figure 1 is a conceptual block diagram of the
ADMV8818-EP.
The ADMV8818-EP consists of two sections, the input and the
output section. The input section has four high-pass filters and an
optional bypass configuration that is selectable by the two SP5T
RFIN switches. Similarly, the output section has four low-pass
filters and an optional bypass configuration that is selectable by the
two SP5T RFOUT switches. Because the input and output
sections are independent from one another, the chip can be
configured for any combination of high-pass filter, low-pass
filter, or bypass configuration.
The two SP5T RFIN switches are controlled simultaneously with a
3-bit digital control. Likewise, the two SP5T RFOUT switches
are controlled simultaneously with a 3-bit digital control. This
control scheme creates a total of 25 possible combinations of
switch settings, achieving many possible filter responses.
Figure 30 shows an example of the signal path when the two
SP5T RFIN and two SP5T RFOUT switches are configured for
the HPF 1 and LPF 1, respectively. Using this switch setting, a
band-pass or a no pass response can be created in the 2 GHz to
3.8 GHz frequency range, depending on the filter settings for
the HPF 1 and LPF 1.
SPI
GND
14
13
12
11
10
9
8
7
5
4
3
2
1
6
GND
GND
GND
GND
GND
RFIN
GND
GND
GND
GND
GND
GND
RST
29
30
31
32
33
34
35
36
37
38
39
40
41
42
GND
VSS1 (–2.5V)
GND
VDD2 (+3.3V)
GND
GND
RFOUT
GND
GND
GND
GND
VDD1 (+2.5V)
GND
GND
BYPASS
2
BYPASS
2
1
3
4
3
1
4
Figure 30. ADMV8818-EP Configured for HPF 1 and LPF 1
Similarly, any of the filters can be bypassed, creating a low-pass
or a high-pass response, as shown in Figure 31, where the HPF
is bypassed and LPF 3 filter is selected. This configuration enables a
tunable LPF response in the 8 GHz to 12 GHz frequency range.
SPI
GND
14
13
12
11
10
9
8
7
5
4
3
2
1
6
GND
GND
GND
GND
GND
RFIN
GND
GND
GND
GND
GND
GND
RST
29
30
31
32
33
34
35
36
37
38
39
40
41
42
GND
VSS1 (–2.5V)
GND
VDD2 (+3.3V)
GND
GND
RFOUT
GND
GND
GND
GND
VDD1 (+2.5V)
GND
GND
BYPASS
2
2
1
3
4
3
1
4
BYPASS
Figure 31. ADMV8818-EP Configured for LPF 3
Moreover, any of the high-pass filters can be coupled with any of
the low-pass filters, achieving virtually no dead zones in the
2 GHz to 18 GHz frequency range and a wide band-pass response.
Figure 32 shows the conceptual block diagram of ADMV8818-
EP when HPF 3 and LPF 2 are selected.
SPI
GND
14
13
12
11
10
9
8
7
5
4
3
2
1
6
GND
GND
GND
GND
GND
RFIN
GND
GND
GND
GND
GND
GND
RST
29
30
31
32
33
34
35
36
37
38
39
40
41
42
GND
VSS1 (–2.5V)
GND
VDD2 (+3.3V)
GND
GND
RFOUT
GND
GND
GND
GND
VDD1 (+2.5V)
GND
GND
BYPASS
2
BYPASS
2
1
3
4
3
1
4
Figure 32. ADMV8818-EP Configured for HPF 3 and LPF 2
TUNABLE HIGH-PASS FILTERS
Figure 33 shows a simplified schematic of the HPF 1, which is a
Chebyshev type filter. The f3dB can be adjusted by varying
Capacitor C1 to Capacitor C4. These tunable capacitors are
constructed with 4-bit digital capacitor arrays, providing 16
distinct values. The step size of these tunable capacitors is
adjusted so that each digital binary code increment creates
approximately the same increment in the f3dB.



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