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ML3356RP bảng dữ liệu(PDF) 4 Page - LANSDALE Semiconductor Inc.

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ML3356RP bảng dữ liệu(HTML) 4 Page - LANSDALE Semiconductor Inc.

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Issue A
LANSDALE Semiconductor, Inc.
ML3356
Figure 5. Application with Fixed Bias on Data Shaper
1
ML3356
RF In
1:2
0.01
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
23
15 pF
5.6 pF
Data Out
5.0 V
18 k
10 k
390 k
10 k
Car. Det. Out
0 V or 4.0 V
3.3 k
130 k
3.0 k
0.1
3.3 k
470
pF
15 k
18 k
150 pF
5.0 V
+ 5.0 to + 12 V
0.01
fO
Bead
4.0 V
180
0.01
82
0.1
Cer. Fil.
10.7 MHz
330
0.01
0.01
0.01
Bead
0.1
RF Input
Ground
Data
Output
Comp(+) Comp(–) Squelch
Status
Squelch
Control
Demod
Out
Demod
Filter
Quad
Input
RF
Gnd
OSC
EM.
OSC
COL.
RF
VCC
Mixer
Out
VCC
Limiter
Input
Limiter
Bias
Limiter
Bias
Quad
Bias
330
APPLICATION NOTES (continued)
Shielding, which includes the placement of input and output
components, is important in minimizing electrostatic or elec-
tromagnetic coupling. The ML3356 has its pin connections
such that the circuit designer can place the critical input and
output circuits on opposite ends of the chip. Shielding is nor-
mally required for inductors in tuned circuits.
The ML3356 has a separate VCC and ground for the RF and
IF sections which allows good external circuit isolation by
minimizing common ground paths.
Note that the circuits of Figures 1 and 2 have RF, Oscillator,
and IF circuits predominantly referenced to the plus supply
rails. Figure 5, on the other hand, shows a suitable means of
ground referencing. The two methods produce identical results
when carefully executed. It is important to treat Pin 19 as a
ground node for either approach. The RF input should be
‘‘grounded’’ to Pin 1 and then the input and the mixer/oscilla-
tor grounds (or RF VCC bypasses) should be connected by a
low inductance path to Pin 19. IF and detector sections should
also have their bypasses returned by a separate path to Pin 19.
VCC and RF VCC can be decoupled to minimize feedback,
although the configuration of Figure 2 shows a successful
implementation on a common 5.0 V supply. Once again, the
message is: define a supply node and a ground node and return
each section to those nodes by separate, low impedance paths.
The test circuit of Figure 2 has a 3 dB limiting level of 30
µV which can be lowered 6 db by a 1:2 untuned transformer at
the input as shown in Figures 5 and 6. For applications that
require additional sensitivity, an RF amplifier can be added,
but with no greater than 20 db gain. This will give a 2.0 to 2.5
µV sensitivity and any additional gain will reduce receiver
dynamic range without improving its sensitivity. Although the
test circuit operates at 5.0 V, the mixer/oscillator optimum per-
formance is at 8.0 V to 12 V. A minimum of 8.0 V is recom-
mended in high frequency applications (above 150 MHz), or in
PLL applications where the oscillator drives a prescaler.
Legacy Applications Information


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