描述 Description

Overview The 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(yīng)用 Application

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