MC33696FCAE Freescale Semiconductor, MC33696FCAE Datasheet - Page 8

• Manufacturer Part Number: MC33696FCAE
• Description: IC UHF RECEIVER PLL TUNED 32-QFN
• Manufacturer: Freescale Semiconductor
• Type: Transceiverr

Specifications of MC33696FCAE

• Frequency: 304, 315, 426, 434, 868 & 915MHz
• Data Rate - Maximum: 20kbps
• Modulation Or Protocol: FSK, OOK
• Applications: General Data Transfer
• Power - Output: 7.5dBm
• Sensitivity: -106dBm
• Voltage - Supply: 2.7 V ~ 3.3 V, 4.5 V ~ 5.5 V
• Current - Receiving: 10.3mA
• Current - Transmitting: 13mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-QFN
• Operating Frequency: 915 MHz
• Operating Supply Voltage: 2.5 V or 3.3 V or 5 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 20 C
• Mounting Style: SMD/SMT
• Operating Temperature (min): -20C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Commercial
• Modulation Type: FSK/OOK
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Transmitter Functional Description
8
The single-ended power amplifier is connected to the RFOUT pin.
In the case of amplitude modulation, coded data sent by the microcontroller unit (MCU) are used for on/off
keying (OOK) the RF carrier. Rise and fall times of the RF transmission are controlled to minimize
spurious emission.
In the case of frequency modulation, coded data sent by the MCU are used for frequency shift keying
(FSK) the RF carrier.
RF output power can be reduced using four programmable steps.
Out-of-lock detection prevents any out-of-band emission, by stopping the transmission.
The logic output SWITCH enables control of an external RF switch for isolating the two RF pins. Its output
toggles when the circuit changes from receive to transmit, and vice versa.
This signal can also be used to control an external power amplifier or LNA, or to indicate to the MCU the
current state of the MC33696 (RX or TX).
9
9.1
All clocks running in the circuit are derived from the reference frequency provided by the crystal oscillator
(frequency f
has to operate.
9.2
The IF filter is controlled by the crystal oscillator to guarantee the frequency over temperature and voltage
range. The IF filter center frequency, FIF, can be computed using the crystal frequency f
of the CF bits:
8
Frequency
433.92
(MHz)
868.3
916.5
304
315
426
•
RF
If CF[0] = 0 : FIF = f
Transmitter Functional Description
Frequency Planning
Clock Generator
Intermediate Frequency
ref
CF1
0
0
0
0
1
1
, period t
Table 4
CF0
Table 4. Crystal Frequency and CF Values Versus Frequency Band
0
0
1
1
1
1
shows the value of the CF bits.
ref
). The crystal frequency is chosen in relation to the band in which the MC33696
LOF1
0
1
1
0
0
1
ref
/9×1.5/2
LOF0
0
0
0
1
1
1
MC33696 Data Sheet, Rev. 12
F
Frequency)
REF
16.96745
17.58140
23.74913
24.19066
24.16139
25.50261
(MHz)
(Crystal
Frequency)
F
(MHz)
1.414
1.465
1.484
1.512
1.510
1.594
IF
(IF
Dataclk
Divider
60
60
80
80
80
80
282.791
293.023
296.864
302.383
302.017
318.783
F
(kHz)
dataclk
Divider
Digclk
Freescale Semiconductor
30
30
40
40
40
40
ref
565.582
586.047
593.728
604.767
604.035
637.565
F
and the value
(kHz)
digclk
T
1.77
1.71
1.68
1.65
1.66
1.57
(µs)
digclk