TDA5221 Infineon Technologies, TDA5221 Datasheet - Page 23

• 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

injection of the local oscillator has to be used for receive frequencies between 300 and
320 MHz. In this case the local oscillator frequency is calculated by adding the IF
frequency (10.7 MHz) to the RF frequency. In this case the higher frequency of a FSK-
modulated signal is demodulated as a logical one (high).
Low-side injection has to be used for receive frequencies between 320 and 340 MHz.
The local oscillator frequency is calculated by subtracting the IF frequency (10.7 MHz)
from the RF frequency then. Please note that in this case sign-inversion occurs and the
higher frequency of a FSK-modulated signal is demodulated as a logical zero (low). The
overall division ratios in the PLL are 32 or 32.25 depending on whether the FSEL-pin is
left open or tied to ground.
Therefore the crystal frequency may be calculated by using the following formula:
with
Table 6
FSEL
open
GND
This yields the following examples:
FSEL is „Low“:
FSEL is „High“:
3.5
The threshold of the data slicer can be generated using an external R-C integrator as
shown in Figure 7.
Preliminary Specification
Data Slicer Threshold Generation
ƒ
ƒ
r ratio of local oscillator (PLL) frequency and crystal frequency as
shown in the subsequent table
ƒ
LO
QU
RF
Dependence of PLL Overall Division Ratio on FSEL
local oscillator (PLL) frequency (ƒ
receive frequency
quartz crystal oscillator frequency
f
QU
f
QU
318
316
.
55
MHz
MHz
f
32
QU
32
.
25
10
10
7 .
f
23
7 .
RF
MHz
Ratio r=(f
32
32.25
MHz
r
10
RF
7 .
10
10
±
.
LO
209375
.
209375
10.7)
/f
QU
)
MHz
MHz
V 1.1, 2004-10-20
Applications
TDA 5221