mc33493a Freescale Semiconductor, Inc, mc33493a Datasheet - Page 10

• Manufacturer Part Number: mc33493a
• Description: Pll Tuned Uhf Transmitter For Data Transfer
• Manufacturer: Freescale Semiconductor, Inc

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