TDA18218HN_1

© NXP B.V. 2009. All rights reserved.

Product data sheet

Rev. 01 — 8 July 2009

4 of 25

NXP Semiconductors

TDA18218HN

DVB-T Silicon Tuner IC

8.

Functional description

The RF input signal is driven to a low-noise amplifier. It is then amplified and fed to the

image rejection mixer. The mixer down-converts the RF signal to a low IF frequency, which

depends on channel bandwidth (standard IF filters are implemented for 6 MHz, 7 MHz

CPLO

15

charge pump of the LO synthesizer

XTAL_P

16

crystal oscillator input positive

XTAL_N

17

crystal oscillator input negative

i.c.

18

internally connected; leave open

XTO_P

19

crystal oscillator output buffer positive

XTO_N

20

crystal oscillator output buffer negative

XTAL_MS

21

XTAL out mode

AS

22

GND(IF)

23

IF ground

CP_K

24

charge pump of the calibration synthesizer

VT_K

25

tuning voltage of the calibration synthesizer

REG18

26

internal regulator decoupling

REG28

27

internal regulator decoupling

GND(IF)

28

IF ground

29

IF supply voltage (3.3 V)

IFO_N

30

IF output negative

IFO_P

31

IF output positive

VIFAGC

32

IF gain control input

i.c.

33

internally connected; leave open

GND(DIG)

34

digital ground

SCL

35

SDA

36

CAPRFAGC

37

RF AGC filtering

GND(RF)

38

RF ground

i.c.

39

internally connected; leave open

GND(RF)

40

RF ground

GND(RF)

41

RF ground

GND(RF)

42

RF ground

i.c.

43

internally connected; leave open

GND(RF)

44

RF ground

45

RF supply voltage

LT

46

loop-through

47

RF supply voltage

i.c.

48

internally connected; leave open

Table 3.

Symbol

Pin

Description