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MC33493DTB

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22
Recommendations for FSK Modulation
PLL Tuned UHF Transmitter for Data Transfer Applications, Rev. 1.7
Freescale Semiconductor 19
Device pad capacitance is defined by the package capacitance and by the internal circuitry. Typical capacitance values for these
pads are given in Table 11.
Some realistic assumptions and measurements have been made concerning track parasitic capacitances for a 0.8 mm FR4
double side application PCB. They are given in Table 11 and the corresponding PCB layout is shown in figure Figure 17.
To achieve large deviations, this total load capacitance must be lowered. For a given crystal, the PCB must be carefully laid out
to reduce the capacitance of the tracks wired to XTAL0, XTAL1, and CFSK pins.
Recommendation: a R_off resistor can be added in parallel with the FSK switch to optimize the transient response of
demodulated signal. Table 11 gives the optimized R_off values for two deviations. There is no footprint for R_off resistor on
the layout in Figure 16. When used, this component can be soldered on top of C3.
Figure 16. Crystal Load Capacitance Contributors Schematic
Table 11. Pads and Tracks Parasitic Values
Capacitance Value Unit
C_pad_XTAL0 1 pF
C_pad_XTAL1 1 pF
C_pad_CFSK 1 pF
C_track_XTAL0 1.5 pF
C_track_XTAL1 1.5 pF
C_track_CFSK 1.5 pF
PLL Tuned UHF Transmitter for Data Transfer Applications, Rev. 1.7
Case Outline Dimensions
Freescale Semiconductor20
15 Case Outline Dimensions
Figure 17. Case Outline Dimensions
CASE 948G-01
ISSUE O
DIM MIN MAX MIN MAX
INCHESMILLIMETERS
A 4.90 5.10 0.193 0.200
B 4.30 4.50 0.169 0.177
C --- 1.20 --- 0.047
D 0.05 0.15 0.002 0.006
F 0.50 0.75 0.020 0.030
G 0.65 BSC 0.026 BSC
H 0.50 0.60 0.020 0.024
J 0.09 0.20 0.004 0.008
J1 0.09 0.16 0.004 0.006
K 0.19 0.30 0.007 0.012
K1 0.19 0.25 0.007 0.010
L 6.40 BSC 0.252 BSC
M 0 8 0 8
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSION A DOES NOT INCLUDE MOLD
FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH OR GATE BURRS SHALL NOT
EXCEED 0.15 (0.006) PER SIDE.
4. DIMENSION B DOES NOT INCLUDE
INTERLEAD FLASH OR PROTRUSION.
INTERLEAD FLASH OR PROTRUSION SHALL
NOT EXCEED
0.25 (0.010) PER SIDE.
5. DIMENSION K DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.08 (0.003) TOTAL
IN EXCESS OF THE K DIMENSION AT
MAXIMUM MATERIAL CONDITION.
6. TERMINAL NUMBERS ARE SHOWN FOR
REFERENCE ONLY.
7. DIMENSION A AND B ARE TO BE
°°°°
S
U0.15 (0.006)
T
2X L/2
S
U
M
0.10 (0.004) V
S
T
L
-U-
SEATING
PLANE
0.10 (0.004)
-T-
SECTION N-N
DETAIL E
J
J1
K
K1
DETAIL E
F
M
-W-
0.25 (0.010)
8
14
7
1
PIN 1
IDENT.
H
G
A
D
C
B
S
U0.15 (0.006)
T
-V-
14X REFK
N
N
PLL Tuned UHF Transmitter for Data Transfer Applications, Rev. 1.7
Freescale Semiconductor 21
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P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22

MC33493DTB

Mfr. #:
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Manufacturer:
NXP / Freescale
Description:
RF Transmitter 315 434 868 MHz
Lifecycle:
New from this manufacturer.
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