描述 Description

OverviewThe Integrated Circuit (IC) is suitable for Intermediate Frequency (IF) processing including global multistandard Analog TV (ATV), Digital Video Broadcast (DVB) and mono FM radio using only 1 IC and 1 to 3 fixed Surface Acoustic Waves (SAWs) (application dependent). TDA9898 includes, TDA9897 excludes L and L-accent standard.

特性 Features

General



?5 V supply voltage

?I2C-bus control over all functions

?Four I2C-bus addresses provided; selection by programmable Module Address (MAD)

?Three I2C-bus voltage level supported; selection via pin BVS

?Separate gain controlled amplifiers with input selector and conversion for incoming IF [analog Vision IF (VIF) or Sound IF (SIF) or Digital TV (DTV)] allows the use of different filter shapes and bandwidths

?All conventional ATV standards applicable by using DTV bandwidth window (SAW) filter

?Two 4 MHz reference frequency stages; the first one operates as crystal oscillator, the second one as external signal input

?Stabilizer circuit for ripple rejection and to achieve constant output signals

?Smallest size, simplest application

?ElectroStatic Discharge (ESD) protection for all pins



Analog TV processing



?Gain controlled wideband VIF amplifier; AC-coupled

?Multistandard true synchronous demodulation with active carrier regeneration: very linear demodulation, good intermodulation figures, reduced harmonics and excellent pulse response

?Integrated Nyquist processing, providing additionally image suppression for high adjacent channel selectivity

?Optional use of conventional Nyquist filter to support a wide range of applications

?Gated phase detector for L and L-accent standards

?Fully integrated VIF Voltage-Controlled Oscillator (VCO), alignment-free, frequencies switchable for all negative and positive modulated standards via I2C-bus

?VIF Automatic Gain Control (AGC) detector for gain control; operating as a peak sync detector for negative modulated signals and as a peak white detector for positive modulated signals

?Optimized AGC modes for negative modulation; e.g. very fast reaction time for VIF and SIF

?Precise fully digital Automatic Frequency Control (AFC) detector with 4-bit Digital-to-Analog Converter (DAC); AFC bits can be read-out via I2C-bus

?High precise Tuner AGC (TAGC) TakeOver Point (TOP) for negative modulated standards; TOP adjust via I2C-bus

?TAGC TOP for positive standards and Received Signal Strength Indication (RSSI); adjustable via I2C-bus or alternatively by potentiometer

?Fully integrated Sound Carrier (SC) trap for any ATV standard (SC at 4.5 MHz, 5.5 MHz, 6.0 MHz and 6.5 MHz)

?SIF AGC for gain controlled SIF amplifier and high-performance single-reference Quasi Split Sound (QSS) mixer

?Fully integrated sound BP filter supporting any ATV standard

?Optional use of external FM or AM sound BP filter

?AM sound demodulation for L and L-accent standard

?Alignment-free selective FM Phase-Locked Loop (PLL) demodulator with high linearity and low noise; external FM input

?Port function

?VIF AGC voltage monitor output or port function

?TAGC voltage monitor output or port function

?VIF AFC current or tuner, VIF, SIF or FM AGC voltage monitor output

?2nd SIF output, gain controlled by internal SIF AGC or by internal FM carrier AGC for Digital Signal Processor (DSP)

?Fully integrated BP filter for 2nd SIF at 4.5 MHz, 5.5 MHz, 6.0 MHz or 6.5 MHz



Digital TV processing



?Applicable for terrestrial and cable TV reception

?70 dB variable gain wideband IF amplifier (AC-coupled)

?Gain control via external control voltage (0 V to 3 V)

?2 V (p-p) differential low IF (downconverted) output or 1 V (p-p) 1st IF output for direct Analog-to-Digital Converter (ADC) interfacing

?DVB downconversion with integrated selectivity for Low IF (LIF)

?Integrated anti-aliasing tracking low-pass filter

?Fully integrated synthesizer controlled oscillator with excellent phase noise performance

?Synthesizer frequencies for a wide range of world wide DVB standards (for IF center frequencies of e.g. 34.5 MHz, 36 MHz, 44 MHz and 57 MHz)

?TAGC detector for independent tuner gain control loop applications

?TAGC operating as peak detector, fast reaction time due to additional speed-up detector

?Port function

?TAGC voltage monitor output



FM radio mode



?Gain controlled wideband Radio IF (RIF) amplifier; AC-coupled

?Buffered RIF amplifier wideband output, gain controlled by internal RIF AGC

?Use of external FM sound BP filter

?2nd RIF output, gain controlled by internal RIF AGC or by internal FM carrier AGC for DSP

?Alignment-free selective FM PLL demodulator with high linearity and low noise

?Precise fully digital AFC detector with 4-bit DAC; AFC bits read-out via I2C-bus

?Port function

?Radio AFC or tuner, RIF or FM AGC voltage monitor output

應用 Application

Analog and digital TV front-end applications for TV sets, recording applications and personal computer cards