參數(shù)資料
型號(hào)： 935263520557
廠商： NXP SEMICONDUCTORS
元件分類： 通信及網(wǎng)絡(luò)
英文描述： SPECIALTY TELECOM CIRCUIT, PQFP100
封裝： PLASTIC, SOT-317, QFP-100
文件頁(yè)數(shù)： 14/24頁(yè)
文件大?。?/td> 134K
代理商： 935263520557
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TDA8044
Information as of 2000-08-20
TDA8044; Satellite demodulator and decoder
Check device status and availability before design in!
Please check with your nearest sales or distributor office status and availability of devices listed on this page.
This document gives preliminary information about the TDA8044 and TDA8044A, which are the successors of the TDA8043. The
TDA8044A is only specified where the product deviates from the TDA8044, all other references are the same. The TDA8044 is backwards
compatible with the TDA8043, with respect to pinning and the IC-bus software. The TDA8044 is a DVB compliant demodulator and error
correction decoder IC for reception of QPSK and BPSK modulated signals for satellite applications. It can handle variable symbol rates in
the range of 0.5 to 45 Msymbols/s (0.5 to 30 Msymbols/s for TDA8044A) with a minimum number of low cost and non-critical external
components. Typical applications for this device are Multi Channel Per Carrier (MCPC), Single Channel Per Carrier (SCPC) and simulcast.
In these applications one satellite transponder contains respectively one broad QPSK carrier, several small QPSK carriers and one small
QPSK carrier together with one or two FM carriers.
The TDA8044 has minimum interface with the tuner, it only requires the demodulated analog I and Q baseband input signals. Analog-to-
digital conversion is performed internally by two matched 7-bit ADCs. Since all the loops (AGC, clock and carrier recovery) are internal, no
feedback to the tuner is needed. However, for maximum tuner flexibility, there is the possibility to close the AGC and carrier recovery loop
externally via the tuner.
The number of external components required for operation of the TDA8044 is very low. Moreover the external components are low cost
and non-critical. This gives an easy and low cost application. The TDA8044 operates on a low frequency crystal which is upconverted to a
clock frequency by means of an internal PLL. Different clock frequencies can be selected with the PLL without changing the crystal. This
allows for maximum flexibility concerning symbol rate range combined with minimum power consumption.
The TDA8044 also has internal anti-alias filters, which can cover a large range of symbol frequencies (approximately one decade) without
the need to switch external (SAW) filters. To cover the whole range of 0.5 to 45 Msymbols/s switching of clock frequency (internally) and
filtering (externally) is necessary.
The TDA8044 has a double carrier loop configuration which has excellent capabilities of tracking phase noise. Synchronization of the FEC
unit is done completely internally, thereby minimizing IC-bus communication. The output of the TDA8044 is highly flexible, allowing
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