mc13176d ETC-unknow, mc13176d Datasheet - Page 6

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mc13176d

Manufacturer Part Number
mc13176d
Description
Fm/am Transmitter
Manufacturer
ETC-unknow
Datasheet

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0
Evaluation PC Board
versatile and is intended to be used across the entire useful
frequency range of this device. The center section of the
board provides an area for attaching all SMT components to
the circuit side and radial leaded components to the
component ground side of the PCB (see Figures 35 and 36).
Additionally, the peripheral area surrounding the RF core
provides pads to add supporting and interface circuitry as a
particular application dictates. This evaluation board will be
discussed and referenced in this section.
Current Controlled Oscillator (Pins 1 to 4)
(Pins 1 and 4) to the external inductor symmetrical and equal
in length. With a minimum inductor, the maximum free
running frequency is greater than 1.0 GHz. Since this
inductor will be small, it may be either a microstrip inductor,
an air wound inductor or a tuneable RF coil. An air wound
inductor may be tuned by spreading the windings, whereas
tuneable RF coils are tuned by adjusting the position of an
aluminum core in a threaded coilform. As the aluminum core
coupling to the windings is increased, the inductance is
decreased. The temperature coefficient using an aluminum
core is better than a ferrite core. The UniCoil
made by Coilcraft may be obtained with aluminum cores
(Part No. 51–129–169).
Ground (Pins 5, 10 and 15)
backside ground plane via plated through holes or eyelets at
the pins. The application PCB layout implements this
technique. Note that the grounds are located at or less than
100 mils from the devices pins.
each section of the device by reducing interaction between
sections and by localizing circulating currents.
Loop Characteristics (Pins 6 and 7)
MC1317XD PLL system where the loop characteristics are
described by the gain constants. Access to individual
components of this PLL system is limited, inasmuch as the
loop is only pinned out at the phase detector output and the
6
The evaluation PCB, shown in Figures 33 and 34, is very
It is critical to keep the interconnect leads from the CCO
Ground Returns: It is best to take the grounds to a
Decoupling: Decoupling each ground pin to V CC isolates
Figure 11 is the component block diagram of the
– 20
– 30
– 40
–10
20
10
–100
0
Figure 9. Change in Oscillator Frequency
versus Oscillator Control Current
0
I Cont , OSCILLATOR CONTROL CURRENT ( A)
100
200
V CC = 3.0 Vdc
I mod = 2.0 mA
T A = 25 C
f osc (I Cont @ 0 ) 320 MHz
300
400
APPLICATIONS INFORMATION
MC13175 MC13176
500
inductors
600
frequency control input for the CCO. However, this allows for
characterization of the gain constants of these loop
components. The gain constants K p , K o and K n are well
defined in the MC13175 and MC13176.
Phase Detector (Pin 7)
phase detector is DC voltage that is a function of the phase
difference. The sinusoidal type detector used in this IC has
the following transfer characteristic:
The gain factor of the phase detector, K p (with the loop in lock)
is specified as the ratio of DC output current, l e to phase
error, e :
Figures 7 and 8 show that the detector DC current is
approximately 30
at
Current Controlled Oscillator, CCO (Pin 6)
of the oscillator over an extended range of control current for
320 and 450 MHz applications. K o ranges from
approximately 6.3x10 5 rad/sec/ A or 100 kHz/ A (Figure 9)
to 8.8x10 5 rad/sec/ A or 140 kHz/ A (Figure 10) over a
relatively linear response of control current (0 to 100 A). The
oscillator gain factor depends on the operating range of the
control current (i.e., the slope is not constant). Included in the
CCO gain factor is the internal amplifier which can sink and
source at least 30
detector. The internal circuitry at Pin 6 limits the CCO control
current to 50 A of source capability while its sink capability
exceeds 200
information to follow shows how to use the full capabilities of
the CCO by addition of an external loop amplifier and filter
(see Figure 15). This additional circuitry yields at K o =
0.145 MHz/ A or 9.1x10 5 rad/sec/ A.
– 20
– 30
– 40
–10
With the loop in lock, the difference frequency output of the
Figures 9 and 10 show the non–linear change in frequency
20
10
0
–100
e = + /2 radians; therefore, K p is 30 A/radians.
I e = A Sin e
K p = I e/ e (Amps/radians)
K p = A Sin e/ e
Sin e ~ e for e
thus, K p = A (Amps/radians)
Figure 10. Change in Oscillator Frequency
0
versus Oscillator Control Current
I Cont , OSCILLATOR CONTROL CURRENT ( A)
A as shown in Figures 9 and 10. Further
100
A of input current from the phase
A where the loop loses lock
MOTOROLA RF/IF DEVICE DATA
0.2 radians;
200
V CC = 3.0 Vdc
I mod = 2.0 mA
T A = 25 C
f osc (I Cont @ 0 ) 450 MHz
300
400
500
600