TDA5150 Datasheet, PDF (61/106 Pages) Infineon Technologies AG – On-chip, high resolution fractional-N synthesizer and Sigma-Delta modulator with ASK, FSK, GFSK options

TDA 5150
TDA 5150 Functional Description
2.4.11.1 Asynchronous Transmission
In Asynchronous Transmission Mode (also referred as Transparent Mode), the data on
SDIO is directly input into modulator and converted into RF carrier.There is no internal
synchronization with the bit-rate clock.The CLKOUT programmed to the proper bit-rate
(or a multiple of it) may be used by the host to time and shift (into SDIO line) the bits to
be transmitted.
The Encoder and Scrambler can not be used and are automatically bypassed.
It is not recommended to use GFSK in conjunction with Asynchronous Transmission
Mode, as the frequency steps are timed with 1/16 of the bit-rate (chip-rate) clock. Timing
differences between the internal bit-rate clock and the µC may cause unwanted jitter in
the transmission. GFSK modulation is intended to be used in conjunction with
Synchronous Transmission Mode.
TRANSMIT data:
Asynchronous Transmission
EN
SCK
> 1000us if TX issued from STDBY
else determined by SCK speed
> 100us
7
0
Command
Configuration
Data to transmit
SDIO
1 1A BCDE F
d1
d2
d3
d4
d5
Transmitted
Data
d1
d2
d3
d4
d5
Figure 20 Asynchronous Transmission
Setting the EN line (pin 1) to low terminates the RF-transmission.
Data Sheet
61
V 1.0, July 2009