TDA5150 Datasheet, PDF (59/106 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 RF Data Transmission
The procedure of RF Transmission starts by rising the EN line (pin 1) high. STANDBY
or SLEEP Mode are exited, and the crystal oscillator started. The crystal oscillator
requires maximum 1 ms to start up. During this time the TDA 5150 can be already
reconfigured, because the SPI block does not require the system clock. Before
transmission the Transmitter Status Register (0x01) should be read (to clear bits set by
previous errors, if any). Every transmission starts with the Transmit Command:
C1
C0
Transmit Command Configuration
Bit Function
Value, description
1
1
A
Data sync 0: off
1: on (at the same time Bit C - Encoding
must be set also to 1 -->int. Encoding)
1
1
B
PA mode 0: PA off at the falling edge of EN
(synchronized with bit-rate if bit A is high)
1: SDIO/DATA is latched at the falling
edge of EN, PA stays on, TX data are kept
constant. After the time-out of 65536 / f_sys
which is ~5 ms for a 13 MHz crystal, PA
and PLL are switched off.
1
1
C
Encoding 0: off
1: on (selects SFR register for encoding
Bit A must be also set to1 -->Data sync)
1
1
D
Pwr. level/ 0: selects PowerLevel/Modulation Setting1
ModSetting ^{1: selects Power Level/Modulation Setting2}
1
1
<E,F> Frequency 0 (00): selects frequency channel A
selection 1 (01): selects frequency channel B
2 (10): selects frequency channel C
3 (11): selects frequency channel D
(for description of frequency channels
A..D programming see
Chapter 2.4.11.3 Channel Hopping)
The Transmit Command byte is sent via SPI, and identified by the first two bits,
designated C0 and C1. These two bits are mandatory set to1.
The following 6 bits, designated bit A.. bit F, specify the transmission details.
• A: Synchronous (1) or asynchronous (0) transmission, details are described later in
this chapter.
Data Sheet
59
V 1.0, July 2009