參數(shù)資料
型號(hào)： TDA5221
廠(chǎng)商： INFINEON TECHNOLOGIES AG
英文描述： ASK/FSK Single Conversion Receiver
中文描述： 詢(xún)價(jià)/ FSK信號(hào)單一轉(zhuǎn)換接收器
文件頁(yè)數(shù)： 26/44頁(yè)
文件大?。?/td> 705K
代理商： TDA5221
Applications
4 - 6
TDA 5221
preliminary
Wireless Components
Target Specification, October 2001
4.4 Quartz Frequency Calculation
As described in Section 3.4.3 the operating range of the on-chip VCO is wide
enough to guarantee a receive frequency range between 300 and 340MHz. The
VCO signal is divided by 2 before applied to the mixer . This local oscillator sig-
nal can be used to downconvert the RF signals both with high- or low-side injec-
tion at the mixer. High-side 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 fre-
quency. 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 fre-
quency (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 quartz frequency may be calculated by using the following for-
mula:
QU
= (
RF
±
10.7) / r
with
RF
LO
QU
r
receive frequency
local oscillator (PLL) frequency (
RF
±
10.7)
quartz oscillator frequency
ratio of local oscillator (PLL) frequency and quartz frequency as
shown in the subsequent table
This yields the following examples:
FSEL is
‘
Low
‘
:
FSEL is
‘
High
‘
:
Table 4-1 PLL Division Ratio Dependence on States of CSEL
FSEL
Ratio r = (f
LO
/f
QU
)
High
32
Low
32.25
(
)
MHz
MHz
7
10
MHz
55
.
318
f
209375
.
10
25
.
32
/
QU
=
+
=
(
)
MHz
MHz
MHz
f
209375
.
10
32
/
7
10
316
QU
=
+
=
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