TEA5761UK datasheet(8/45 Pages) NXP

Nome de Peças	TEA5761UK

Descrição Electrónicos	Low voltage single-chip FM stereo radio

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9397 750 13451

Product data sheet

Rev. 01 — 2 August 2006

7 of 44

Philips Semiconductors

TEA5761UK

Low voltage single-chip FM stereo radio

8.5 PLL tuning system

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 TEA5761UK. 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 12 and Table 13. Calculation of this 14-bit word can be done as follows.

Formula for high-side injection:

(1)

Formula for low-side injection:

(2)

where:

NDEC = decimal value of PLL word

fRF = wanted tuning frequency (Hz)

fIF = intermediate frequency of 225 kHz

fref = reference frequency of 32.768 kHz

Example for receiving a channel at 100.1 MHz:

(3)

The result found using Equation 1 or Equation 2 must always be rounded to the lowest

integer value. If rounded down to the lowest integer value of NDEC = 12246, the PLL word

becomes 2FD6h.

This value can be written to register FRQSET via the I2C-bus and the TEA5761UK will

then start an autonomous search at this frequency or go to a preset channel at this

frequency. When the application is built according to the application diagram (see

Figure 13) and with the preferred components, the PLL will settle to the new frequency

within 40 ms.

The PLL is triggered by writing to any one of the bytes FRQSETMSB, FRQSETLSB,

TNCTRL1, TNCTRL2, TESTBITS, TESTMODE.

Accurate validation of the PLL locking on the new frequency can take 40 ms. When a lock

is detected bit LD is set.

8.6 Band limits

The TEA5761UK can be switched to the Japanese FM band or to the US and Europe FM

band. Setting bit BLIM to logic 0 the band range is 87.5 MHz to 108 MHz; setting bit

BLIM to logic 1 selects the Japanese band range of 76 MHz to 90 MHz.

N

DEC

4f

RF

f

IF

+

()

×

f

ref

--------------------------------------

=

N

DEC

4f

RF

f

IF

–

()

×

f

ref

--------------------------------------

=

N

DEC

4

100.1

10

6

×

225

10

3

×

+

()

×

32768

------------------------------------------------------------------------

12246.704

==

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