MC33696MOD315EV Freescale Semiconductor, MC33696MOD315EV Datasheet - Page 9

• Manufacturer Part Number: MC33696MOD315EV
• Description: MCU, MPU & DSP Development Tools MC33696 (ECHO) RF C EVAL
• Manufacturer: Freescale Semiconductor

Specifications of MC33696MOD315EV

• Processor To Be Evaluated: MC9S08RG60
• Interface Type: RS-232
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The cut-off frequency given in the parametric section can be computed by scaling to the FIF.
9.3
The frequency synthesizer consists of a local oscillator (LO) driven by a fractional N phase locked loop
(PLL).
The LO is an integrated LC voltage controlled oscillator (VCO) operating at twice the RF frequency (for
the 868 MHz frequency band) or four times the RF frequency (for the 434 MHz and 315 MHz frequency
bands). This allows the I/Q signals driving the mixer to be generated by division.
The fractional divider offers high flexibility in the frequency generation for:
Frequencies are controlled by means of registers. To allow for user preference, two programming access
methods are offered (see
10
The MC33696 and the MCU communicate via a serial peripheral interface (SPI). According to the selected
mode, the MC33696 or the MCU manages the data transfer. The MC33696’s digital interface can be used
as a standard SPI (master/slave) or as a simple interface (SPI deselected). In the following case, the
interface’s pins are used as standard I/O pins. However, the MCU has the highest priority, as it can control
the MC33696 by setting CONFB pin to the low level. During an SPI access, the STROBE pin must remain
at high level to prevent the MC33696 from entering standby mode.
The interface is operated by six I/O pins.
1. Refer to parameter 3.3 found in
Freescale Semiconductor
•
•
•
•
•
•
•
•
If CF[0] = 1 : FIF = f
Compute the low cut-off frequency of the IF filter for a 16.9683 MHz crystal oscillator. For this
reference frequency, FIF = 1.414 MHz.
So, the 1.387 MHz
1.387 × 1.414/1.5 = 1.307 MHz.
Switching between transmit and receive modes.
Achieving frequency modulation in FSK modulation transmission.
Performing multi-channel links.
Trimming the RF carrier.
In friendly access, all frequencies are computed internally from the contents of the carrier
frequency and deviation frequency registers.
In direct access, the user programs direct all three frequency registers.
CONFB — Configuration control input
The configuration mode is reached by setting CONFB to low level.
Frequency Synthesizer Description
MCU Interface
Section 18.3, “Frequency
1
low cut-off frequency specified for a 1.5 MHz IF frequency becomes
Section 21.3, “Receiver Parameters.”
ref
/12×1.5/2
Example 1. Cut-off Frequency Computation
MC33696 Data Sheet, Rev. 12
Registers”).
MCU Interface
9