AD8352 데이터 시트보기 (PDF) - Analog Devices
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AD8352 Datasheet PDF : 19 Pages
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AD8352
20
18
16
14
12
10
8
6
4
2
0
0
100 200 300 400 500 600 700 800
RG (Ω)
Figure 24. Gain vs. RG, RL = 1 kΩ
20
18
16
14
12
10
8
6
4
2
0
0
0.1
0.2
0.3
0.4
0.5
CD (pF)
Figure 25. Gain vs. CD, RL = 1 kΩ
SINGLE-ENDED INPUT OPERATION
The AD8352 can be configured as a single-ended-to-differential
amplifier, as shown in Figure 26. To balance the outputs when
driving the VIP input, an external resistor (RN) of 200 Ω is added
between VIP and RGN. See Equation 2 to determine the single-
ended input gain (AV ) Single-Ended for a given RG or RL.
AV
Single−Ended
=
(RG
+
RG+
5) (RL
500
+ 53)
+
430
RL+
RL
RL + 30
(2)
where
RL is the single-ended load.
RG is the gain setting resistor.
Data Sheet
Figure 27 plots gain vs. RG for 200 Ω and 1 kΩ loads. Table 7
and Table 8 show the values of CD and RD required (for 180 MHz
broadband, third-order, single tone optimization) for 200 Ω and
1 kΩ loads, respectively. This single-ended configuration provides
−3 dB bandwidths similar to input differential drive. Figure 28
through Figure 31 show distortion levels at a gain of 12 dB for
both 200 Ω and 1 kΩ loads. Gains from 3 dB to 18 dB, using
optimized CD and RD values, obtain similar distortion levels.
0.1µF
0.1µF
VIP
65Ω
50Ω
CD RD RG
0.1µF
AC
25Ω
RN
200Ω
RGP
AD8352
RGN
0.1µF
Figure 26. Single-Ended Schematic
40
35
30
25
20
GAIN, RL = 1kΩ
15
GAIN, RL = 200Ω
10
5
0
1
10
100
1k
10k
RG (Ω)
Figure 27. Gain vs. RG
–60
–70
2V p-p OUT
–80
1V p-p OUT
–90
–100
–110
10
70
140
190
240
FREQUENCY (MHz)
Figure 28. Single-Ended, Second-Order Harmonic Distortion (HD2) vs.
Frequency, 200 Ω Load
Rev. C | Page 12 of 19
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