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ADL5569BCPZ-R7 데이터시트(PDF) 17 Page - Analog Devices

부품명 ADL5569BCPZ-R7
상세설명  6.5 GHz, Ultrahigh Dynamic Range, Differential Amplifier
PDF  23 Pages
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제조업체  AD [Analog Devices]
홈페이지  http://www.analog.com
Logo AD - Analog Devices

ADL5569BCPZ-R7 데이터시트(HTML) 17 Page - Analog Devices

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Data Sheet
ADL5569
Rev. C | Page 17 of 23
Determine the single-ended gain (AV1) using the following two
equations:
IN
MATCH
IN
R2 R
R
R2 R
×
=
+
(5)
where RMATCH is the input resistance value that matches RS,
which is calculated as follows:
500
10
50
V1
MATCH
S
L
S
MATCH
L
S
S
A
RR
R2
R
R
R2
R
R
R
R2
R
R2
=
+
×
×
×
+
+
×
+ 

+

(6)
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
500
1000
1500
2000
2500
3000
3500
4000
4500
FREQUENCY (MHz)
SINGLE-ENDED
DIFFERENTIAL
Figure 44. HD2 for Single-Ended and Differential Configurations vs.
Frequency, VOUT = 2 V p-p
GAIN ADJUSTMENT AND INTERFACING
The effective gain of the ADL5569 can be reduced by adding
two resistors in series with the inputs to reduce the gain.
AC
½
ADL5569
½
RS
½
RS
0.1µF
0.1µF
50Ω
50Ω
500Ω
500Ω
RL
0.1µF
0.1µF
RSERIES
RSHUNT
RSERIES
+
–
Figure 45. Gain Adjustment Using a Series Resistor
To find series resistor (RSERIES) for a given AV gain and RL, use
the following equation:
RSERIES = (500/AV) − 50
(7)
The necessary shunt component (RSHUNT) to match the source
impedance, RS, is expressed as
1
11
2
100
SHUNT
S
SERIES
R
RR
=
−
×+
(8)
The shunt resistor values for multiple target voltage gains are
listed in Table 5. The source resistance and input impedance
need careful attention when using Equation 6. Consider the
input impedance of the ADL5569 and the reactance of the ac
coupling capacitors before assuming that the impedance and
reactance of the capacitors make a negligible contribution.
To calculate the AV for a given RSERIES, use the following
equation:
500
50
V
SERIES
A
R

= 

+

(9)
Note that Equation 9 only gives the absolute gain and does not
take into account that the circuit introduces a 180° phase shift.
To account for this phase shift, multiply the product of
Equation 9 by −1.
Table 5. Differential Gain Adjustment Using Series Resistor
RS (Ω)
Target Voltage Gain (dB)
RSERIES (Ω)
RSHUNT (Ω)
50
6
169
56.2
50
7
147
57.6
50
8
124
59
50
9
105
59
50
10
88.7
60.4
50
11
73.2
63.4
50
12
60.4
64.9
50
13
48.7
66.5
50
14
37.4
69.8
50
15
28
73.2
50
16
19.6
78.7
50
17
12.1
84.5
50
18
5.23
90.9
100
6
169
130
100
7
147
133
100
8
124
140
100
9
105
147
100
10
88.7
158
100
11
73.2
169
100
12
60.4
182
100
13
48.7
205
100
14
37.4
232
100
15
28
280
100
16
19.6
357
100
17
12.1
511
100
18
5.23
1050



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