TDA10045 データシートの表示（PDF） - Philips Electronics

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TDA10045

Single Chip DVB-T Channel Receiver

Philips Electronics 

Philips Semiconductors

Single Chip DVB-T Channel Receiver

Preliminary specification

TDA10045

FIGURE 3 : TYPICAL APPLICATION : DVB-T FRONT END RECEIVER

I2C

RC

EEPROM

IF1

RF

TUNER

IF1

IF_AGC

or

IF2

IF

Interface

RF_AGC

SCL

SDA

optional IF2 down

conversion reference

frequency

RC

RC

VAGC Xin Xout

VIP

A 10

VIM D

C

Optional

SDA_EEP

SCL_EEP

SACLK

TDA10045

8

SDA_TUN

SCL_TUN

DS_SPARE_1

SP_IN(0)

SCL, SDA

PSYNC

UNCOR

DEN

OCLK

DO(7:0)

Optional ADC

I2C Bus

TUNER

• A RF tracking filter tracks the RF wanted frequency and suppresses the image.

• A first local AGC could be done at RF level, the AGC level information could be provided externaly and the chip

offers facilities to measure this level thanks to the optional ADC (Rem: this measure is automaticaly made by the

DSP, the host has just to read the result).

• A mixer oscillator and a PLL down-convert the RF signal to Intermediate Frequency IF1 typicaly 36.125 MHz

• SAW filters reject the adjacent analog channels power at IF1

IF INTERFACE

• It is either an analog IF amplifier when IF1 is sampled (digital down-conversion concept)

• Or an analog IF amplifier followed by a down-conversion from IF1 to IF2 at few MHz (ex :4.57 MHz)

• When this second solution is used, the ADC sampling clock could be used (after low-pass filtering) as reference

clock for down-conversion (rem : twice the ADC sampling clock could also be provided – see reg CONFADC).

• The IF amplifier is controlled by the digital AGC of the chip. A simple RC circuitry will filter the single-bit (∆Σ

modulated) AGC control (VAGC)

• The sampling clock could also be used to control an external ADC, then the input of the chip are digital (FI[9 :0])

TDA10045

• The chip is controlled by an I2C Bus and driven by an external low-cost crystal oscillator

• The software of the embedded DSP could be downloaded from the main I2C bus or from a dedicated I2C Bus

connected to an external slave I2C Eeprom.

• An internal bidirectional switch allows to program the tuner through the chip and then switch off this link in order

to avoid phase noise distortions due to I2C Bus traffic

2000 March 15

8

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