TDA7326 datasheet(11/16 Pages) STMICROELECTRONICS

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fREF = 1KHz

FVCO = (64

⋅ PC + SC + 64) ⋅ fREF

AM SWALLOW MODE

FVCO = (DIV_VAL+ 64)

⋅ fREF

swallow 6bit

fREF = 2.5KHz

FVCO = (32

⋅ PC + SC + 32) ⋅ fREF

FVCO = (DIV_VAL+ 32)

⋅ fREF

swallow 5bit (bit SC5 = 0)

AM DIRECT MODE

FVCO = (DIV_VAL+ 1)

⋅ fREF

a) CONDITIONS:

FM MODE (fRF = 98.1MHz, fREF = 25KHz; IF = 10.7MHz

it follows: that FVCO = 98.1 + 10.7 = 108.8MHz

DIV_VAL =

FVCO

fref

- 32 =4352 - 32 = 4320 = 10 E 0 Hex

5.2: Examples

000

110

000

PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0 SC5 SC4 SC3 SC2 SC1 SC0

SC = 0 (*)

binary

⇒

PC = 135

b) CONDITIONS:

FM MODE (fRF = 98.8MHz, fREF = 25KHz; IF = 10.7MHz

it follows: FVCO = 98.8 + 10.7 = 109.5MHz

DIV_VAL = 4380 - 32 = 4348 = 10 FC Hex

00001

110

111

PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0 SC5 SC4 SC3 SC2 SC1 SC0

SC = 28 (*)

binary

⇒

PC = 135

NOTE: (*) The bit SC5 is FORCED = 0, and higher weigth bits are left shift ed one position.

TDA7326

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