TDA8262HN

General description

The direct conversion QPSK demodulator is the front-end receiver dedicated to digital TV broadcasting, satisfying both DVB-S and DBS TV standards. The wide range oscillator (from 950 MHz to 2175 MHz) covers the American, European and Asian satellite bands, as well as the SMA-TV US standard.

The Zero-IF (ZIF) concept discards traditional IF filtering and intermediate conversion techniques.

Gain-controlled amplifiers in the RF guarantee optimum signal level. The variable gain is controlled by the signal returned from the Satellite Demodulator and Decoder (SDD) and applied to pin AGC.

The integrated LNA allows the IC to be directly connected to the LNB output. The LNA can be by-passed by an I²C-bus selectable attenuation, providing a 20 dB extra attenuation in order to handle higher input signal levels of up to 0 dBm per channel.

An integrated loop-through realizes a copy of the input RF signal for another downconverter. This feature offers a BOM reduction and simplifies the application for dual channel demodulation like watch and record.

Connected at the RF input, an RMS level detector provides through I²C-bus read mode the full band input signal level.

The LO quadrature outputs are derived from a high performance integrated LC oscillator.

Its frequency is: (f LO)/N = (f xtal)/R . Thanks to the low phase noise performance of the integrated LC oscillator which controls the LO frequency, the synthesizer offers a good performance for phase noise in the satellite band. The step size of the LO output frequency is equal to the comparison frequency.

Control data is entered via the I²C-bus. The bus can be either 5.0 V or 3.3 V, allowing compatibility with most of existing microcontrollers.

An 8-byte frame is required to address the device and to program the main divider ratio, the reference divider ratio, the charge-pump current and the operating mode.

A flag is set when the loop is in-lock, readable during read operations, as well as the Power-on reset flag and RF input level.

The device has four selectable I²C-bus addresses. Applying a specific voltage to pin AS selects an address. This feature gives the possibility to use up to four TDA8262HN ICs in the same system.

Features

• Direct conversion QPSK and 8PSK demodulation (ZIF)
• 3.3 V DC supply voltage (no 30 V required)
• Power-down modes selectable by bus
• 950 MHz to 2175 MHz frequency range
• High range input level;
• -70 dBm to -15 dBm at 75 Ohm (normal mode)
• Up to 0 dBm (20 dB attenuation configuration).
• Low noise RF input (integrated LNA)
• RF loop-through
• 0 dB to 55 dB continuous variable gain on RF input
• RF input level detectorv
• Switchable 0 dB to 9 dB additional gain on baseband output amplifier
• High AGC linearity (< 0.7 dB/step when used with an 8-bit DAC), AGC controlled voltage between 0.3 V and 3 V
• Programmable 5 MHz to 36 MHz 5th-order baseband filters for I and Q paths
• Fully integrated PLL frequency synthesizer
• Low phase noise fully integrated oscillator
• Operation from a 16 MHz crystal or external clock
• 5 frequency steps from 125 kHz to 2 MHz
• Crystal frequency output to drive the demodulator IC
• Compatible with 5 V and 3.3 V I²C-bus
• Fully compatible and easy to interface with the PS digital satellite demodulators family
• 32-pin low thermal resistance package.

Products/packages

Pricing/ordering/availability

Applications

• Direct Broadcasting Satellite (DBS) QPSK demodulation
• Digital Video Broadcasting (DVB) QPSK demodulation
• BS digital 8PSK demodulation
• DVB-S2 8PSK demodulation.

Related applications
Satellite STB reference design STB200S
Set-top box with DVR and dual decoding STB220
Entry-level Nexperia STB system solution STB100

Design support

Support Documents

75015645; Connected Living (2006-09-01)

75014636; Getting more from distribution (2005-02-01)

75015632; NXP entry-level Nexperia STB system solution STB100 (2006-09-01)

75015387; NXP set-top box system solution STB220 for terrestrial,cable and satellite applications (2006-09-01)

75014015; NexepriaTM STB200 NexperiaTM satellite STB system solution (2005-02-28)

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