MC13158 データシートの表示（PDF） - Motorola => Freescale
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MC13158 Datasheet PDF : 24 Pages
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MC13158
The recovered data signal from the quadrature detector
can be DC coupled to the data slicer DS IN1 (Pin 18). In the
application circuit shown in Figure 1 it will be centered at
2.0 VBE and allowed to swing ± VBE. A capacitor is placed
from DS IN2 (Pin 20) to VEE. The size of this capacitor and
the nature of the data signal determine how faithfully the data
slicer shapes up the recovered signal. The time constant is
short for large peak to peak voltage swings or when there is
a change in DC level at the detector output. For small signal
or for continuous bits of the same polarity which drift close to
the threshold voltage, the time constant is longer.
A unique feature of the data slicer is that the inverting
switching stages in the comparator are supplied through the
emitter pin of the output transistor (Pin 22 – DS Gnd) to VEE
rather than internally to VEE. This is provided in order to
reduce switching feedback to the front end. A control pin is
provided to shut the data slicer output off (DS “off” – Pin 19).
With DS “off” pin at VCC the data slicer output is shut off by
shutting down the base drive to the output transistor. When a
channel is being monitored to make an RSSI measurement,
but not to collect data, the data output may be shut off to save
current.
Pin
Symbol
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 1
Mix
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Out
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 2
VCC1
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 3
IF
In
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 4
IF
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Dec1
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 5
IF
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Dec2
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 6
IF
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Out
PIN FUNCTION DESCRIPTION
Internal Equivalent Circuit
Description/External Circuit Requirements
Mixer Output
2
The mixer output impedance is 330 Ω; it
VCC1
matches to 10.7 MHz ceramic filters with
330 Ω input impedance.
1
Mix
Out
26
VEE1
2
VCC1
64 k
5
IF Dec2
330
64 k
26
VEE1
3
IF In
4
IF Dec1
Supply Voltage (VCC1)
This pin is the VCC pin for the Mixer, Local
Oscillator, and IF Amplifer. The operating
supply voltage range is from 1.8 Vdc to
5.0 Vdc. In the PCB layout, the VCC trace
must be kept as wide as possible to minimize
inductive reactances along the trace; it is best
to have it completely fill around the surface
mount components and traces on the circuit
side of the PCB.
IF Input
The input impedance at Pin 3 is 330 Ω. It
matches the 330 Ω load impedance of a
10.7 MHz ceramic filter. Thus, no external
matching is required.
IF DEC1 & DEC2
IF decoupling pins. Decoupling capacitors
should be placed directly at the pins to enhance
stability. Two capacitors are decoupled to the
RF ground VCC1; one is placed between DEC1
& DEC2.
2
IF Output
VCC1
The output impedance is 330 Ω; it matches
the 330 input resistance of a 10.7 MHz
ceramic filter.
5
IF
Out
26
VEE1
MOTOROLA ANALOG IC DEVICE DATA
7
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