tda9898hn/v2 NXP Semiconductors, tda9898hn/v2 Datasheet - Page 15

• Manufacturer Part Number: tda9898hn/v2
• Description: Tda9897; Tda9898 Multistandard Hybrid If Processing
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDA9897_TDA9898_3
Product data sheet
8.3.1 Mode selection of VIF AGC
8.3.2 VIF AGC monitor
8.3.3 Tuner AGC
8.2 VIF demodulator
8.3 VIF AGC and tuner AGC
Switch configuration allows independent selection of filter for analog VIF and for analog
SIF (used at same time) or DIF.
The switch takes into account correct signal selection for TAGC in the event of VIF and
DIF signal processing.
ATV demodulation using 6 MHz DVB window (band-pass) filter (for 6 MHz, 7 MHz or
8 MHz channel width).
IF frequencies adapted to enable the use of different filter configurations. The Nyquist
processing is integrated.
For optional use of standard Nyquist filter the integrated Nyquist processing can be
switched off.
Sideband switch supplies selection of lower or upper sideband (e.g. for L-accent).
Equalizer provides optimum pulse response at different standards [e.g. to cope with
higher demands for Liquid Crystal Display (LCD) TV].
Integrated sound traps.
Sound trap reference independent from received 2nd sound IF (reference taken from
integrated reference synthesizer).
IF level selection provides an optimum adaptation of the demodulator to high linearity or
low noise.
Peak white AGC for positive modulation mode with adaptation for speed up and black level
AGC (using proven system from TDA9886).
For negative modulation mode equal response times for increasing or decreasing input
level (optimum for amplitude fading) or normal peak AGC or ultra fast peak AGC.
VIF AGC DC voltage monitor output (with expanded internal characteristic).
VIF AGC read out via I
(TOP setting either via I
Independent integral tuner gain control loop (not nested with VIF AGC). Integral
characteristic provides high control accuracy.
Accurate setting of tuner control onset (TOP) for integral tuner gain control loop via
I
For L standard, TAGC remains VIF AGC nested, as from field experience in the past this
narrow-band TAGC gives best performance.
2
C-bus.
Rev. 03 — 11 January 2008
2
C-bus (for IF level indication) with zero-calibration via TOP setting
2
C-bus or via TOP potentiometer).
TDA9897; TDA9898
Multistandard hybrid IF processing
© NXP B.V. 2008. All rights reserved.
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