mc13176d ETC-unknow, mc13176d Datasheet - Page 13

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mc13176d

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

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power has been reduced for linearity and current drain. The
current draw on the device is 16 mA I CC (average) and
– 22.5 dBm (average power output) using a 10 kHz
modulating rate for the on–off keying. This equates to 20 mA
and – 2.3 dBm “On”, 13 mA and – 41 dBm “Off”. In Figure 26,
the device’s modulating waveform and encoded carrier are
NOTES: 1. 50
MOTOROLA RF/IF DEVICE DATA
Figure 25 shows a typical application in which the output
2. Pins 5, 10 and 15 are ground and connnected to V EE which is
3. The crystal oscillator circuit may be adjusted for frequency with
match to a 50
the component/DC ground plane side of PCB. These pins must
be decoupled to V CC ; decoupling capacitors should be placed
as close as possible to the pins.
the variable inductor (MC13175); 1.0 k resistor shunting the
crystal prevents it from oscillating in the fundamental mode.
Recommended source is Coilcraft “slot seven” 7.0 mm tuneable
inductor, part #7M3–821.
coaxial balun, 1/10 wavelength line (1.5 ) provides the best
(MC13176)
100p
load.
V EE
(2)
V CC
150–05J08
Coilcraft
150p
(MC13175)
Tank
Osc
30p
0.1
0.165
1.0k
Figure 25. ASK 320 MHz Application Circuit
1
2
3
4
5
6
7
8
MC13175 MC13176
MC13176–180p
MC13175–30p
f/N
40.0000 MHz
3rd Overtone
4. The On–Off keyed signal turns the output of the transmitter off and on with
5. S1 simulates an enable gate pulse from a microprocessor which will
MC13175
displayed. The crystal oscillator enable time is needed to set
the acquisition timing. It takes typically 4.0 msec to reach full
magnitude of the oscillator waveform (see Figure 27,
Oscillator Waveform, at Pin 8). A square waveform of 3.0 V
peak with a period that is greater than the oscillator enable
time is applied to the Enable (Pin 11).
Crystal
TTL level pulses through R mod at Pin 16. The “On” power and I CC is set
by the resistor which sets I mod = VTTL – 0.8 / R mod . (see Figure 28).
enable the transmitter. (see Figure 4 to determine precise value of the
enabling resistor based on the potential of the gate pulse and the
desired enable.)
1.0k
16
15
14
13
12
10
11
9
0.82
V EE
V EE
0.01
RFC 1
3.3k
R mod
(3)
0.01
Z = 50
(1)
Fundamental
MC13176
27k
10 MHz
Crystal
0.1
V CC
S 1
On–Off Keyed Input
TTL Level 10 kHz
150p
(5)
SM
(4)
A
V CC
RF Out
13