mc13176d ETC-unknow, mc13176d Datasheet - Page 4

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mc13176d

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

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0
13 & 14
4
Pin
10
12
15
16
11
8
9
Out 1 and
Reg. Gnd
Out_Gnd
Symbol
Enable
Out 2
Xtale
Xtalb
V CC
I mod
9
9
8
Out_Gnd
Xtalb
Xtale
15
Out 1
11
Enable
Subcon
10
Reg. Gnd
13
13
Internal Equivalent
V CC
V CC
Circuit
14
14
V CC
V CC
8.0k
12
Out 2
8.0k
PIN FUNCTION DESCRIPTIONS
V CC
MC13175 MC13176
5.0p
5.0p
2.4k
16
16
4.0k
12k
I mod
Reg
Crystal Oscillator Inputs
The internal reference oscillator is configured as a common
emitter Colpitts. It may be operated with either a fundamental
or overtone crystal depending on the carrier frequency and the
internal prescaler. Crystal oscillator circuits and specifications
of crystals are discussed in detail in the applications section.
Wi h V
With V CC = 3.0 Vdc, the voltage at Pin 8 is approximately 1.8
Vdc and at Pin 9 is approximately 2.3 Vdc. 500 to 1000 mVp–p
should be present at Pin 9. The Colpitts is biased at 200 A;
additional drive may be acquired by increasing the bias to
approximately 500 A. Use 6.2 k from Pin 8 to ground.
Regulator Ground
An additional ground pin is provided to enhance the stability of
the system. Decoupling to the V CC (RF ground) is essential; it
should be done at the ground return for Pin 10.
Device Enable
The potential at Pin 11 is approximately 1.25 Vdc. When Pin 11
is open, the transmitter is disabled in a power down mode and
draws less than 1.0 A I CC if the MOD at Pin 16 is also open
(i.e., it has no current driving it). To enable the transmitter a
current source of 10 A to 90 A is provided. Figures 3 and 4
show the relationship between I CC , V CC and I reg. enable . Note
that I CC is flat at approximately 10 mA for I reg . enable = 5.0 to
100 A (I mod = 0).
Supply Voltage (V CC )
Differential Output
The output is configured differentially to easily drive a loop
antenna. By using a transformer or balun, as shown in the
application schematic, the device may then drive an unbalanced
low impedance load. Figure 6 shows how much the Output
Power and Free–Running Oscillator Frequency change with
temperature at 3.0 Vdc; I mod = 2.0 mA.
Output Ground
This additional ground pin provides direct access for the output
ground to the circuit board V EE .
AM Modulation/Power Output Level
The DC voltage at this pin is 0.8 Vdc with the current source
active. An external resistor is chosen to provide a source
current of 1.0 to 3.0 mA, depending on the desired output power
level at a given V CC . Figure 28 shows the relationship of Power
The operating supply voltage range is from 1.8 Vdc to 5.0 Vdc.
In the PCB layout, the V CC 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.
Output to Modulation Current, I mod . At V CC = 3.0 Vdc, 3.5 dBm
power output can be acquired with about 35 mA I CC .
For FM modulation, Pin 16 is used to set the desired output
power level as described above.
For AM modulation, the modulation signal must ride on a
positive DC bias offset which sets a static (modulation off)
modulation current. External circuitry for various schemes is
further discussed in the Applications Information section.
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Circuit Requirements
Description/External
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MOTOROLA RF/IF DEVICE DATA
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