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RF Output Spectrum
Table 5. Electrical Characteristics (continued)
Limits
Parameter
Test Conditions, Comments
Unit
Min.
Typ.
Max.
2.41 Data to RF delay difference between
MODE = 0, see note
3.5
5.25
7.5
μs
2.42
falling and rising edges,
t delay_difference
MODE = 1, see note
–200
—
200
ns
Note: This parameter is depending on crystal characteristics, load capacitor values (see Table 4 ) and PCB track capacitance.
Note: Delay difference definition
Input data
Demodulated data
3
t delay_rise
From 50% of data edge to corresponding
demodulated signal envelope edge:
t delay_difference = t delay_fall – t delay_rise
t delay_fall
Microcontroller Interfaces
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
3.10
Input low voltage
Input high voltage
Input hysteresis voltage
Input current
ENABLE pulldown resistor
DATACLK output low voltage
DATACLK output high voltage
DATACLK rising time
DATACLK falling time
DATACLK settling time,
t DATACLK_settling
Pins: BAND, MODE, ENABLE, and DATA
Pins: BAND, MODE,DATA = 1
C load = 2 pF
C load = 2 pF, measured from 20% to 80% of the
voltage swing
45% < duty cycle f DATACLK < 55%
0
0.7 x
V CC
—
—
—
0
0.75 x
V CC
—
—
—
—
—
—
—
180
—
—
250
150
800
0.3 x
V CC
V CC
120
100
—
0.25 x
V CC
V CC
500
400
2000
V
V
mV
nA
k Ω
V
V
ns
ns
μs
10
RF Output Spectrum
The following figures represent spectrums of the transmitter carrier, measured in conduction mode. Three different spans have
been used. The 5 MHz span spectrum ( Figure 5 ) shows phase noise response close to the RF carrier and the noise suppression
within the PLL-loop bandwidth. The 50 MHz span spectrum ( Figure 6 ) shows phase noise and reference spurious. Finally, the
1.5 GHz span spectrum ( Figure 7 ) shows the second and third harmonics of carrier. All spectrums are measured in OOK
modulation at DATA=1.
Figure 8 shows the spectrum in case of FSK modulation with 45 kHz deviation at 4 kbit/s data rate.
PLL Tuned UHF Transmitter for Data Transfer Applications, Rev. 1.7
10
Freescale Semiconductor
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