TDA5221 Infineon Technologies, TDA5221 Datasheet - Page 16

• Manufacturer Part Number: TDA5221
• Description: RECEIVER SHR FSK/ASK SGL TSSOP28
• Manufacturer: Infineon Technologies
• Type: Receiverr

Specifications of TDA5221

• Package / Case: 28-TSSOP
• Frequency: 300MHz ~ 340MHz
• Sensitivity: -113dBm
• Data Rate - Maximum: 100 kbps
• Modulation Or Protocol: ASK, FSK
• Applications: RKE, Remote Control Systems
• Current - Receiving: 6.2mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 105°C
• Operating Frequency: 340 MHz
• Operating Supply Voltage: 5 V
• Maximum Operating Temperature: + 105 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Operating Temperature (min): -40C
• Operating Temperature (max): 105C
• Operating Temperature Classification: Industrial
• Product Depth (mm): 4.4mm
• Product Length (mm): 9.7mm
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Memory Size: -
• Lead Free Status / Rohs Status: Compliant
• Other names: SP000014343; TDA5221; TDA5221INTR; TDA5221XT

2.4.2
The Double Balanced Mixer downconverts the input frequency (RF) in the range of 310-
350MHz to the intermediate frequency (IF) at 10.7MHz with a vol-tage gain of
approximately 21dB by utilising either high- or low-side injection of the local oscillator
signal. In case the mixer is interfaced only single-ended, the unused mixer input has to
be tied to ground via a capacitor. The mixer is followed by a low pass filter with a corner
frequency of 20MHz in order to suppress RF signals to appear at the IF output (IFO pin).
The IF output is internally consisting of an emitter follower that has a source impedance
of approximately 330
ceramic filter without additional matching circuitry.
2.4.3
The Phase Locked Loop synthesizer consists of a VCO, an asynchronous divider chain,
a phase detector with charge pump and a loop filter and is fully implemented on-chip.
The VCO is including spiral inductors and varactor diodes. The tuning range of the VCO
was designed to guarantee over production spread and the specified temperature range
a receive frequency range between 300 and 340 MHz depending on whether high- or
low-side injection of the local oscillator is used. The oscillator signal is fed both to the
synthesiser divider chain and to a divider that is dividing the signal by 2 before it is
applied to the downconverting mixer. Local oscillator high side injection has to be used
for receive frequencies between approximately 300 and 320 MHz, low side injection for
receive frequencies between 320 and 340MHz - see also Section 3.4. To be able to
switch between two different frequency channels a divider ratio of either 32 or 32.25 can
be selected via the FSEL-Pin.
Table 2
FSEL
Open
GND
2.4.4
The calculation of the value of the necessary crystal load capacitance is shown in
Section 3.3, the crystal frequency calculation is explained in Section 3.4.
2.4.5
The Limiter is an AC coupled multistage amplifier with a cumulative gain of
approximately 80 dB that has a bandpass-characteristic centred around 10.7 MHz. It
has a typical input impedance of 330
ceramic IF filter. The limiter circuit also acts as a Receive Signal Strength Indicator
Preliminary Specification
Mixer
PLL Synthesizer
Crystal Oscillator
Limiter
Dependence of PLL overall division ratio on FSEL
to facilitate interfacing the pin directly to a standard 10.7MHz
to allow for easy interfacing to a 10.7 MHz
16
Ratio r=(f
32
32.25
L0
/f
QU
)
Functional Description
V 1.1, 2004-10-20
TDA 5221