TDA6650TT Datasheet, PDF (7/55 Pages) NXP Semiconductors – 5 V mixer/oscillator and low noise PLL synthesizer for hybrid terrestrial tuner (digital and analog)

Philips Semiconductors
5 V mixer/oscillator and low noise PLL synthesizer
for hybrid terrestrial tuner (digital and analog)
Product specification
TDA6650TT;
TDA6651TT
handbook, halfpage
HBIN1 1
38 LOSCIN
HBIN2 2
37 LOSCOUT
MBIN 3
36 OSCGND
LBIN 4
35 MOSCIN2
RFGND 5
34 MOSCIN1
IFFIL1 6
33 HOSCIN2
IFFIL2 7
32 HOSCOUT2
BS4 8
31 HOSCOUT1
TDA6650TT
AGC 9
30 HOSCIN1
BS3 10
29 IFGND
BS2 11
28 IFOUTA
BS1 12
27 IFOUTB
BVS 13
ADC/BS5 14
26 VCCA
25 PLLGND
SCL 15
SDA 16
24 VCCD
23 CP
AS 17
22 VT
XTOUT 18
21 n.c.
XTAL1 19
20 XTAL2
FCE724
Fig.2 Pin configuration TDA6650TT.
handbook, halfpage
LOSCIN 1
38 HBIN1
LOSCOUT 2
37 HBIN2
OSCGND 3
36 MBIN
MOSCIN2 4
35 LBIN
MOSCIN1 5
34 RFGND
HOSCIN2 6
33 IFFIL1
HOSCOUT2 7
32 IFFIL2
HOSCOUT1 8
31 BS4
TDA6651TT
HOSCIN1 9
30 AGC
IFGND 10
29 BS3
IFOUTA 11
28 BS2
IFOUTB 12
27 BS1
VCCA 13
PLLGND 14
26 BVS
25 ADC/BS5
VCCD 15
CP 16
24 SCL
23 SDA
VT 17
22 AS
n.c. 18
21 XTOUT
XTAL2 19
20 XTAL1
FCE874
Fig.3 Pin configuration TDA6651TT.
7 FUNCTIONAL DESCRIPTION
7.1 Mixer, Oscillator and PLL (MOPLL) functions
Bit BS1 enables the BS1 port, the low band mixer and the
low band oscillator. Bit BS2 enables the BS2 port, the mid
band mixer and the mid band oscillator. When both BS1
and BS2 bits are logic 0, the high band mixer and the high
band oscillator are enabled.
The oscillator signal is applied to the fractional-N
programmable divider. The divided signal f_div is fed to the
phase comparator where it is compared in both phase and
frequency with the comparison frequency f_comp. This
frequency is derived from the signal present on the crystal
oscillator f_xtal and divided in the reference divider. There is
a fractional calculator on the chip that generates the data
for the fractional divider as well as the reference divider
ratio, depending on the step frequency selected. The
crystal oscillator requires a 4 MHz crystal in series with an
18 pF capacitor between pins XTAL1 and XTAL2.
The output of the phase comparator drives the charge
pump and the loop amplifier section. This amplifier has an
on-chip high voltage drive transistor. Pin CP is the output
of the charge pump, and pin VT is the pin to drive the
tuning voltage to the varicap diodes of the oscillators and
the tracking filters. The loop filter has to be connected
between pins CP and VT. The spurious signals introduced
by the fractional divider are automatically compensated by
the spurious compensation block.
2004 Mar 22
7