tda8262hn-c1 NXP Semiconductors, tda8262hn-c1 Datasheet - Page 7

• Manufacturer Part Number: tda8262hn-c1
• Description: Tda8262hn Fully Integrated Satellite Tuner
• Manufacturer: NXP Semiconductors

Philips Semiconductors
10. Functional description
9397 750 13194
Product data sheet
The TDA8262HN contains the core of the RF analog part of a digital satellite receiver. The
signal coming from the LNB is coupled to the RF inputs. The internal circuitry performs the
Zero-IF quadrature frequency conversion and two in-phase (IP/IN) and two quadrature
(QP/QN) output signals can directly be used to feed a Satellite Demodulator and Decoder
circuit (SDD). Low pass filter cut-off frequency can be adjusted from 5 MHz to 36 MHz in
32 steps. This allows a large flexibility in the SDD input. 10 gain values are present at
output amplifier to compensate cut-off frequency adjustment and single output
application.
The IC gain controlled amplifier before the mixer is controlled by the SDD through pin
AGC.
An input level detector gives the wide band RF level. This information is available through
I
The internal loop controls a fully integrated VCO, to cover the range from 950 MHz to
2175 MHz. This VCO provides both in phase and quadrature signals to drive the two
mixers.
The output of the 15-bit programmable divider passes through the phase comparator
where it is compared in both phase and frequency to the comparison frequency (f
This f
the reference divider. The buffered signal on pin XTOUT is able to drive the crystal
frequency input of the SDD, which saves a crystal in the application.
2
Fig 4. Tuner configuration for two channels (watch and record)
C-bus in read mode.
comp
is derived from the signal present at the XT/XTN pins (f
input
RF
Rev. 01 — 14 December 2004
TDA8262HN
RF loop-through
TDA10093
16 MHz
16 MHz
I
TDA8262HN
2
C-bus
Fully integrated satellite tuner
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
streams
MPEG2
TDA8262HN
XTAL
001aab033
), divided down in
RF output
comp
7 of 30
).