TDA5220XT Infineon Technologies, TDA5220XT Datasheet - Page 23

• Manufacturer Part Number: TDA5220XT
• Manufacturer: Infineon Technologies

Specifications of TDA5220XT

• Operating Temperature (min): -40C
• Operating Temperature (max): 125C
• Operating Temperature Classification: Automotive
• 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: Compliant

with high- or low-side injection at the mixer. High-side injection of the local oscillator has
to be used for receive frequencies between 810 and 840MHz or beteween 400 and
420MHz. In this case the local oscillator frequency is calculated by adding the IF
frequency (10.7 MHz) to the RF frequency. Thus the higher frequency of a FSK-
modulated signal is demodulated as a logical zero (low).
Low-side injection has to be used for receive frequencies above 840 MHz or above
420 MHz. The local oscillator frequency is calculated by subtracting the IF frequency
(10.7 MHz) from the RF frequency then. In this case no sign-inversion occurs and the
higher frequency of a FSK-modulated signal is demodulated as a logical one (high). The
overall division ratios in the PLL are 32 or 64 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“:
Preliminary Specification
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
868
434
4 .
2 .
MHz
MHz
f
QU
64
32
10
10
7 .
f
23
7 .
RF
Ratio r=(f
32
64
MHz
MHz
r
10
RF
7 .
13
13
±
.
LO
.
4015625
234375
10.7)
/f
QU
)
MHz
MHz
V 1.1, 2004-10-20
Applications
TDA 5220