TEA5764UK/N2,027 NXP Semiconductors, TEA5764UK/N2,027 Datasheet - Page 8

• Manufacturer Part Number: TEA5764UK/N2,027
• Description: Tuners FM RADIO WITH RDS
• Manufacturer: NXP Semiconductors

Specifications of TEA5764UK/N2,027

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935278071027 TEA5764UK-G

Philips Semiconductors
TEA5764UK_2
Product data sheet
8.5 PLL tuning system
The crystal oscillator generates the reference frequency for the following:
The PLL synthesizer tuning system is suitable to operate with a 32.768 kHz reference
frequency generated by the crystal oscillator or a reference clock of 32.768 kHz fed into
the TEA5764UK. To tune the radio to the required frequency requires the PLL word to be
calculated and then programmed to the register. The PLL word is 14 bits long; see
Table 20
Formula for high-side injection:
Formula for low-side injection:
where:
Example for receiving a channel at 100.1 MHz:
The result found using
integer value. If rounded down to the lowest integer value of N
becomes 2FD6h.
This value can be written to register FRQSETLSB or FRQSETMSB via the I
the IC will then either start an autonomous search at this frequency or go to a preset
channel at this frequency. When the application is built according to the block diagram
shown in
frequency within 5 ms. The most accurate tuning is accomplished when a search is
followed by a preset to the same frequency.
N
N
N
•
•
•
•
•
•
DEC
DEC
N
f
f
f
DEC
RF
IF
REFS
DEC
Reference frequency divider for synthesizer PLL
Timing for the IF counter
Timing for the pause detector
Free running frequency adjustment of the stereo decoder VCO
Centre frequency for adjustment of the IF filters
Clock frequency of the RDS/RBDS decoder
= intermediate frequency of 225 kHz
= wanted tuning frequency (Hz)
=
=
=
= decimal value of PLL word
= the reference frequency of 32.768 kHz
and
4
------------------------------------- -
4
------------------------------------- -
4
----------------------------------------------------------------------- -
Figure
Table
100.1 10
f
f
f
f
RF
RF
ref
ref
1, and with the preferred components, the PLL will settle to the new
+
–
21. Calculation of this 14-bit word can be done as follows.
f
f
32768
IF
IF
Rev. 02 — 9 August 2005
Equation 1
6
+
225 10
or
3
Equation 2
=
12246.704
must always be rounded to the lowest
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
DEC
TEA5764UK
= 12246, the PLL word
FM radio + RDS
2
C-bus and
7 of 64
(1)
(2)
(3)