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SL3522AMC 数据表(PDF) 8 Page - Mitel Networks Corporation

部件名 SL3522AMC
功能描述  500MHz 75dB Logarithmic/Limiting Amplifier
Download  19 Pages
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制造商  MITEL [Mitel Networks Corporation]
网页  http://www.mitel.com
标志 MITEL - Mitel Networks Corporation

SL3522AMC 数据表(HTML) 8 Page - Mitel Networks Corporation

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8
SL3522
A PRACTICAL APPLICATION FOR THE SL3522
AS A LOG/LIMITING AMPLIFIER
The SL3522, with the RF Output-Buffer ENABLED, has a
large limited RF Output level (0dBm on each of two RF Output
pins (9 and10)) and a wide RF bandwidth (450MHz) in a small
28 pin Miniature Ceramic S.O package. As a result, there is a
tendency for the device to become unstable unless care is
used in the application.
The PCB layout for a ”SL3522 DEMONSTRATION
BOARD” in Fig. 11 has proved reliably stable. The PCB is a
double layer Fibre epoxy board which uses SMDs where
possible. A circuit diagram for the Demonstration PCB appears
in Fig. 10.
The following points should be noted when this
application is realised practically:-
1) A wire needs to connect the two pads connected to pins
14 and 15 of the SL3522, to allow +5V to appear at both pins.
2) ALL the GND connections to the SL3522 are made
through the PCB to a Ground plane on the bottom side. It is
important to ensure that the impedance of each of these
connections is kept to an absolute minimum to prevent
instability. If these connections are achieved using through
plated holes, it is recommended that they are filled with solder
to lower their impedance.
3) The PCB is configured to accept SMA, SMB or SMC
connectors for the RF input, RF Output and Video Output
connections. These can be changed if necessary to an
alternative type, but it is vital to ensure that the ground plane
is solidly connected to the Guard Ring which surrounds the RF
Output tracks.
4) The PCB is configured to accept a small surface
mounting DC isolating BALUN transformer (e.g VANGUARD
VE43666, available from Vanguard Electronics Company Inc,
1480 West 178th St. GARDENA, C.A. 90248, U.S.A. Tel:-
U.S.A. (213) 323 – 4100) to couple a signal into the RF input
connections (pins 27 and 28). It is NOT recommended to
attempt operating the SL3522 with the RF Output Buffer
enabled, WITHOUT using an input BALUN, although it may be
possible, provided the input source impedance to both pins 27
and 28 remains balanced. The centre tap of the secondary
winding of the transformer should be soldered to the small
ground plane on the upper side of the PCB.
5) The RF Output connection to the PCB is from pin 9 of
the SL3522 only, with pin 10 being terminated on the PCB
using a 51
Ω resistor. It is important to ensure that both pin 9
and10 are terminated with equal impedances.
6) The RF Output Buffer can be enabled by soldering a
link (LK) between pin 8 of the SL3522 and the adjacent guard
track around the RF Output lines. Similarly, the buffer can be
disabled by removing the same link. When the buffer is
disabled, the following components can be omitted:-
1nF capacitors (C1, C2)
10nF capacitor (C8)
51
Ω resistor (R
FO )
7) The Slope (gain) and Offset of the Video Output can be
adjusted using two 1k
Ω trimmers, provision for which is
included in the PCB layout.
The plots in Fig. 12 to fig. 23 are typical of the performance
of SL3522 devices used with the PCB layout detailed in Fig.11.
Fig.10 SL3522 demonstration board circuit diagram
+5V VCC
VIDEO
OUTPUT
C5
OFFSET
ADJUST
VR0 1k
10n
GAIN
ADJUST
VRG 1k
1n
1n
15
16
17
18
19
20
21
22
23
24
25
14
13
12
11
10
9
8
7
6
5
4
RF OUTPUT
–5V VEE
10n
3
2
1
26
27
28
10n
RF INPUT
RT
1k5
10n
VIDEO LOADING
R
200
C
20p
10n
10n
C4
C3
10n
LK
C1
C8
C2
C9
RFO
51
C7
C6
RVS
150
RO
1k
RG
1k
SL3522


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