mc13176d ETC-unknow, mc13176d Datasheet - Page 13
Manufacturer Part Number
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
Figure 25. ASK 320 MHz Application Circuit
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
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).
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
Z = 50
On–Off Keyed Input
TTL Level 10 kHz