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參數(shù)資料
| 型號： | TEA5764UK |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | FM radio + RDS |
| 中文描述： | FM, AUDIO SINGLE CHIP RECEIVER, PBGA34 |
| 封裝： | 4 X 4 MM, WLB-34 |
| 文件頁數(shù)： | 28/64頁 |
| 文件大?。?/td> | 287K |
| 代理商： | TEA5764UK |
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TEA5764HN_2
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 02 — 9 August 2005
28 of 64
Philips Semiconductors
TEA5764HN
FM radio + RDS
10.4 Synchronization
10.4.1
Conditions for synchronization
When the RDS decoder is turned on it must be synchronized to extract valid data from the
MPX signal. To do so the decoder automatically initiates a search for synchronization. The
conditions to meet synchronization and the status of this synchronization can be set and
checked by the following bits:
BBL (Bad Blocks Lose): these bits can be set via the I
2
C-bus and have a value
between 0 to 63
GBL (Good Blocks Lose): these bits can be set via the I
2
C-bus and have a value
between 0 to 63
BBG (Bad Blocks Gain): these bits can be set via the I
2
C-bus and have a value
between 0 to 32
GBC (Good Block Count): these bits can be read via the I
2
C-bus and have a value
between 0 to 63
BBC (Bad Block Count): these bits can be read via the I
2
C-bus and have a value
between 0 to 63
When the decoder is not synchronized it will initiate a synchronization search. This
involves calculation of the syndrome for each block of 26 received bits on a bit-by-bit
basis. When a correct syndrome (and hence block ID) is received the decoder clocks the
next 26 bits into the internal registers and performs a second syndrome check.
Synchronization is found when a certain number of blocks have been decoded and two
good blocks have been found, this number of blocks is defined by the BBG bits. If the first
block needed for synchronization has been found and the expected second block (after 26
bits) is an invalid block, then the decoder module internal bad_blocks_counter is
incremented and the next expected block is calculated; exception: if RBDS mode is
selected and the first block is E, then the next expected block is always block A, until
synchronization is found or the maximum bad_blocks_counter value is reached. If the
decoder module internal bad_blocks_counter reaches the value of BBG[4:0], then a new
synchronization search (bit-by-bit) is started immediately to find a new first block.
The synchronization is monitored by two flywheel counters, GBC and BBC. These are
6-bit counters that can be preset by bits GBL and BBL to values between 0 and 63. Each
time a block is decoded and recognized as a bad block the Bad Block Counter value,
BBC, is incremented by 1. When the BBC value is equal to the BBL value, synchronization
is lost. Bit SYNC will become 0 and bit LSYNCFL is set to indicate the loss of
synchronization. The TEA5764HN will now automatically initiate a new synchronization
search.
Each time a good block is decoded, the GBC value is incremented. When the GBC value
is equal to the GBL value, both counters, BBC and GBC, are set to 0 and a new count
starts. The GBC counter is only incremented when the decoder is synchronized.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TEA5764UK/N2,027 | 功能描述:調(diào)諧器 FM RADIO WITH RDS RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度: |
| TEA5764UK-G | 功能描述:調(diào)諧器 FM RADIO WITH RDS RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度: |
| TEA5766UK/N1,023 | 功能描述:調(diào)節(jié)器/解調(diào)器 FM RADIO + RDS RoHS:否 制造商:Texas Instruments 封裝 / 箱體:PVQFN-N24 封裝:Reel |
| TEA5766UK/N1,118 | 功能描述:調(diào)節(jié)器/解調(diào)器 FM RADIO + RDS RoHS:否 制造商:Texas Instruments 封裝 / 箱體:PVQFN-N24 封裝:Reel |
| TEA5766UK/N1/S21,0 | 功能描述:調(diào)諧器 FM RADIO + RDS RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度: |
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