参数资料
型号: TAS3103DBTRG4
厂商: TEXAS INSTRUMENTS INC
元件分类: 消费家电
英文描述: SPECIALTY CONSUMER CIRCUIT, PDSO38
封装: GREEN, PLASTIC, TSSOP-38
文件页数: 10/148页
文件大小: 1247K
代理商: TAS3103DBTRG4
348
3.9.1
Dither Seeds
The dither circuit consists of two linear feedback shift registers—LFSR1 and LFSR2. The dither seed subaddress
(0xC7) consists of a byte-wide seed for LFSR1 (bits 7:0) and a byte-wide seed for LFSR2 (bits 15:8). The seeds serve
to define the starting point of each LFSR sequence, but not the feedback structure itself. Each linear feedback shift
register (LFSR) is a 26-bit structure that runs off the digital audio processor (DAP) clock. For a maximum DAP clock
frequency of 135.168 MHz [12.288 MHz (MCLKI) x 11 (PLL multiplier)], the 26-bit LFSR has a cycle time of 496.5 ms
(226/135.168 MHz). LFSR1 and LFSR2 use the same feedback structure but different taps for outputting. As long as
the seeds for the two LFSRs are not
±13 counts apart (in which case the two different sets of output taps would
correlate), any set of seed values for LFSR1 and LFSR2 is suitable.
When two or more TAS3103s are powered by the same supply, a concern as to whether or not there is correlation
between the dither data streams on different chips arises. At power turn on, a TAS3103 does not begin the dither
process until reset is deactivated. If the TAS3103s are reset by the internal power good signals from the internal
regulators, the chip-to-chip variance of the logic voltage threshold point at which the power good signal is deactivated
assures, with a high probability, that the dither data streams between chips are uncorrelated. However, when an
external logic-driven reset is applied to the TAS3103s, the probability of correlation between the dither data streams
on different chips after the rest is removed significantly increases. For this reason, the dither seeds have been made
programmable via the I2C bus.
相关PDF资料
PDF描述
TAS3103DBTR SPECIALTY CONSUMER CIRCUIT, PDSO38
TAS3103IDBTRG4 SPECIALTY CONSUMER CIRCUIT, PDSO38
TAS3103IDBTR SPECIALTY CONSUMER CIRCUIT, PDSO38
TAS3103IDCP SPECIALTY CONSUMER CIRCUIT, PDSO38
TAS3103DBTG4 SPECIALTY CONSUMER CIRCUIT, PDSO38
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