TDA8083 datasheet(2/16 Pages) PHILIPS

2 / 16 page

1999 Jul 28

Philips Semiconductors

Product speciﬁcation

Satellite Demodulator and Decoder

(SDD3)

TDA8083

FEATURES

• One chip Digital Video Broadcasting (DVB)

(ETS300421) compliant demodulator and concatenated

Viterbi and Reed-Solomon decoder with de-interleaver

and de-randomizer

• 3.3 V supply voltage

• Relevant outputs are 5 V tolerant to ease interface to

5 V environment

• Few external components for full application

• On-chip crystal oscillator (4 MHz) and Phase-Locked

Loop (PLL) for internal clock generation

• Power-on reset module

• QPSK/BPSK demodulator:

– Different modulation schemes: Quadrature Phase

Shift Keying (QPSK) and Binary Phase Shift Keying

(BPSK)

– Interpolator and internal anti-aliasing filter to handle

variable symbol rates

– Tuner Automatic Gain Control (AGC) control

– Two on-chip matched 7-bit Analog-to-Digital

Converters (ADCs)

– Square-root raised-cosine Nyquist

– Maximum symbol frequency of 30 Msymbols/s

– Can be used at low channel Signal-to-Noise Ratio

(S/R)

– Internal full digital carrier recovery, clock recovery

and AGC loops with programmable loop filters

– Two carrier recovery loops enabling optimum phase

noise suppression

– S/R estimation.

• Viterbi decoder:

– Rate 1

⁄2 convolutional code based

– Constraint length K = 7 with G1 = 171oct and

G2 = 133oct

– Supported puncturing code rates: 1

⁄2, 2⁄3, 3⁄4, 4⁄5, 5⁄6,

⁄7, 7⁄8 and 8⁄9

– 4-bit ‘soft decision’ inputs for both I and Q

– Truncation length of 144

– Automatic synchronization to detect puncturing rate

and spectral inversion

– Channel Bit Error Rate (BER) estimation from

10−2 to 10−8

– Differential decoding optional.

• Reed-Solomon (RS) decoder:

– (204, 188, T = 8) Reed-Solomon code

– Automatic synchronization of bytes, transport

packets and frames

– Internal convolutional de-interleaving (I = 12; using

internal memory)

– De-randomizer based on Pseudo Random Binary

Sequence (PRBS)

– External indication of uncorrectable error (transport

error indicator is set)

– Indication of the number of lost blocks

– Indication of the number of corrected blocks.

• Interface:

–I2C-bus interface initializes and monitors the

demodulator and Forward Error Correction (FEC)

decoder; a default mode is defined

– 6-bit I/O expander for flexible access to and from the

I2C-bus

–I2C-bus configurable interrupt input

– Switchable I2C-bus loop-through to suppress I2C-bus

crosstalk in the tuner

– Digital Satellite Equipment Control (DiSEqC) 1.X,

tone burst generation and tone mode with a

22 or 44 kHz carrier

– Parallel or serial output mode for MPEG transport

stream (3-state mode also possible)

– Standby mode for reduced power consumption.

• Package: QFP100

• Boundary scan test.

APPLICATIONS

• Digital satellite TV: demodulation and FEC.

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