TDA5255E1 Datasheet, PDF (57/93 Pages) Infineon Technologies AG – ASK/FSK 434MHz Wireless Transceiver

TDA5255 E1
Version 1.1
Confidential
Application
Default values
In case of using the evaluation board, the crystal with its typical parameters (fp=18.08958MHz,
. ^{C1=8fF, C0=2,08pF, CL=20pF) and external capacitors with Cv1=10pF, Cv2=1.8pF, Cv3=15pF}
each are used the following default states are set in the device
Table 3-6 Default oscillator settings
Operating state
Frequency
ASK-TX / FSK-RX
434.16 MHz
+FSK-TX / ASK-RX
+35 kHz
-FSK-TX
-35 kHz
3.2.7 Chip and System Tolerances
Quartz: fp=18.08958MHz; C1=8fF; C0=2,08pF; CL=20pF (typical values)
Cv1=10pF, Cv2=1.8pF, Cv3=15pF
Table 3-7
Internal Tuning
Part
Frequency set accuracy
Temperature (-40...+85C)
Supply Voltage(2.1...5.5V)
Total
Frequency tolerance
@ 434MHz
+/- 1.3kHz
+/- 3.5kHz
+/- 0.9kHz
+/- 5.7kHz
Rel. tolerance
+/- 3ppm
+/- 8ppm
+/- 2ppm
+/- 13ppm
Table 3-8 Default Setup (without internal tuning & without Pin21 usage)
Part
Frequency tolerance Rel. tolerance
@ 434MHz
Internal capacitors (+/- 10%)
+/- 3.5kHz
+/- 8ppm
Inductivity of the crystal oscillator
+/- 10.8kHz
+/- 25ppm
Temperature (-40...+85C)
+/- 3.5kHz
+/- 8ppm
Supply Voltage (2.1...5.5V)
+/- 0.9kHz
+/- 2ppm
Total
+/- 18.7kHz
+/- 43ppm
Tolerance values in Table 3-8 are valid, if pin 21 is not connected. Establishing the connection to
pin 21 the tolerances increase by +/- 27ppm (internal capacitors), if internal tuning is not used.
Concerning the frequency tolerances of the whole system also crystal tolerances (tuning
tolerances, temperature stability, tolerance of CL) have to be considered.
In addition to the chip tolerances also the crystal and external component tolerances have to be
considered in the tuning and non-tuning case.
Preliminary Specification
57
2002-11-28