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ADL5205ACPZ-R7 数据表(PDF) 21 Page - Analog Devices

部件名 ADL5205ACPZ-R7
功能描述  Dual, 35 dB Range, 1 dB Step Size DGA
PDF  31 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADL5205ACPZ-R7 数据表(HTML) 21 Page - Analog Devices

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Data Sheet
ADL5205
Rev. A | Page 21 of 31
CH1 1V
CH2 1V
CH3 1V
1
2
3
A CH2
1.6V
SCLK
SDIO
CSA OR CSB
Figure 58. Write Read Setup Value, 0x0100
CH1 1V
CH2 1V
A CH2
760mV
CH3 1V
1
2
3
SCLK
SDIO
CSA OR CSB
Figure 59. Read Back Value, 0x0154
ADC INTERFACING
A typical data acquisition system using the ADL5205 together
with an antialiasing filter and an ADC is shown in Figure 60.
The main role of the filter after the amplifier is for attenuating
the broadband noise and out-of-band harmonics generated by
the amplifier. Component values for a 500 MHz acquisition
bandwidth are listed in Table 10. Without this filter, the out-of-
band noise and distortion components alias back into the
Nyquist band, resulting in a reduction of signal-to-noise ratio.
The design of the filter preceding the ADL5205 amplifier is
more specific to the system rejection requirements for the
acquisition system,
C4
R1A
R1B
L3A
L1A
L3B
L1B
VCM
C2B
C2A
ADC
AMP
FILTER
Figure 60. ADC Interface (One of Two Channels Shown)
Table 10. Component Values for a 500 MHz Acquisition System
Component
Value
Description/Comments
Amplifier
½ ADL5205
One channel
L1A, L1B
22 nH
Q ≥ 50 at 500 MHz
C2A, C2B
6.8 pF
Final value depends on PCB
parasitics
L3A, L3B
22 nH
Q ≥ 50 at 500 MHz
C4
1.5 pF
Final value depends on PCB
parasitics
R1A, R1B
10 Ω
Not applicable
ADC
½ AD9680
One channel, input
impedance set to 100 Ω
NOISE FIGURE vs. GAIN SETTING
Because of the architecture of the ADL5205, the noise figure
does not degrade significantly for the first 12 dB of gain reduction
from the maximum gain setting. The noise figure increases by 2 dB
only during the first 12 dB of gain reduction, after which it
resumes the 1 dB degradation for each dB of gain reduction.
0
5
10
15
20
25
30
35
40
45
–10
–5
0
5
10
15
20
25
30
GAIN (dB)
ADL5205 AT
200 MHz 5V HP
REGULAR ATTENUATOR-
AMPLIFIER CASCADE
1.2dB
INCREASE
11dB
IMPROVEMENT
Figure 61. Noise Figure vs. Gain



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