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參數資料
| 型號： | AD8332-EVAL |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Ultralow Noise VGAs with Preamplifier and Programmable RIN |
| 中文描述： | 超低噪聲的VGA前置放大器和可編程與房地產經紀人 |
| 文件頁數： | 22/32頁 |
| 文件大小： | 482K |
| 代理商： | AD8332-EVAL |
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AD8331/AD8332
APPLICATIONS
LNA – EXTERNAL COMPONENTS
The LMD pin (connected to the bias circuitry) must be
bypassed to ground, and signal source to the INH pin
capacitively coupled using 2.2 nF to 0.1 μF capacitors (see
Figure 66).
Rev. C | Page 22 of 32
The unterminated input impedance of the LNA is 6 kΩ. The
user may synthesize any LNA input resistance between 50 Ω
and 6 kΩ. R
FB
is calculated according to Equation 6 or selected
from Table .
(
R
)
(
)
( )
6
–
Ω
6
×
Ω
33
=
IN
IN
FB
k
R
k
R
Table 3. LNA External Component Values
for Common Source Impedances
R
IN
()
R
FB
(Nearest STD 1% Value, )
50
280
75
412
100
562
200
1.13k
500
3.01k
6k
∞
C
SH
(pF)
22
12
8
1.2
None
None
When active input termination is used, a 0.1 μF capacitor (C
FB
) is
required to isolate the input and output bias voltages of the LNA.
The shunt input capacitor, C
SH
, reduces gain peaking at higher
frequencies where the active termination match is lost due to
the HF gain roll-off of the LNA. Suggested values are shown in
Table ; for unterminated applications, reduce the capacitor value
by half.
When a long trace to Pin INH is unavoidable, or if both LNA
outputs drive external circuits, a small ferrite bead (FB) in series
with Pin INH preserves circuit stability with negligible effect on
noise. The bead shown is 75 at 100 MHz (Murata BLM21 or
equivalent). Other values may prove useful.
Figure 67 shows the interconnection details of the LNA output.
Capacitive coupling between LNA outputs and the VGA inputs
is required because of differences in their dc levels and to
eliminate the offset of the LNA. Capacitor values of 0.1 μF are
recommended. There is 0.4 dB loss in gain between the LNA
output and the VGA input due to the 5 Ω output resistance.
Additional loading at the LOP and LON outputs will affect
LNA gain.
21
22
23
24
28
25
26
27
15
16
20
17
18
19
8
7
6
5
1
4
3
2
14
13
9
12
11
10
VCM2
RCLMP
COMM
VOL2
VOH2
VIP2
GAIN
VIN2
LOP2
COM2
LMD2
LON2
VPS2
INH2
COM1
LOP1
LMD1
LON1
VPS1
INH1
VOH1
ENB
VIP1
VCM1
VIN1
VPSV
VOL1
HILO
0.1 F
C
FB
*
C
LMD
0.1
μ
F
1nF
5V
5V
1nF
R
FB
*
5V
+5V
C
SH
*
*
*
LNA
SOURCE
VGA OUT
VGA OUT
5V
1nF
0.1
μ
F
*
SEE TEXT
LNA OUT
1nF
V
GAIN
FB
1nF
0.1
μ
F
0.1
μ
F
0.1
μ
F
0.1
μ
F
1nF
0.1
μ
F
0
Figure 66. Basic Connections for a Typical Channel (AD8332 Shown)
50
LNA
VIN
VIP
LOP
VCM
100
5
LON
TO EXT
CIRCUIT
TO EXT
CIRCUIT
C
SH
5
50
100
0
Figure 67. Interconnections of the LNA and VGA
Both LNA outputs are available for driving external circuits. Pin
LOP should be used in those instances when a single-ended
LNA output is required. The user should be aware of stray
capacitance loading of the LNA outputs, in particular LON. The
LNA can drive 100 Ω in parallel with 10 pF. If an LNA output is
routed to a remote PC board, it will tolerate a load capacitance
up to 100 pF with the addition of a 49.9 Ω series resistor or
ferrite 75 Ω/100 MHz bead.
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