參數(shù)資料
型號(hào)： TAS5028A
廠商： Texas Instruments, Inc.
英文描述： 8 Channel Digital Audio PWM Processor
中文描述： 8 通道數(shù)字音頻 PWM 處理器
文件頁(yè)數(shù)： 40/82頁(yè)
文件大?。?/td> 1226K
代理商： TAS5028A
TAS5028A Controls and Status
33
SLES112 — June 2004
TAS5028A
2.5.1 Manual Bank Selection
The three bank selection bits of the bank control register allow the appropriate bank to be manually selected
(000 = bank 1, 001 = bank 2, 010 = bank 3). In the manual mode, when a write occurs to the bass or treble
coefficients, the current selected bank is updated. If audio data is streaming to the TAS5028A, during a manual
bank selection, the TAS5028A first performs a mute sequence, then performs the bank switch, and finally
restores the volume using an unmute sequence.
A mute command initiated by the bank switch mute sequence overrides an un
mute command or a volume
command. While a mute is active, the commanded channels are muted. When a channel is unmated, the
volume level goes to the last commanded volume setting that has been received for that channel.
If MCLK or SCLK is stopped, the TAS5028A performs a bank switch operation. If the clocks should start up
once the manual bank switch command has been received, the bank switch operation is performed during
the 5-ms silent start sequence.
2.5.2 Automatic Bank Selection
To enable automatic bank selection, a value of 3 is written into in the bank selection bits of the bank control
register. Banks are associated with one or more sample rates by writing values into the Bank 1 or Bank 2 data
rate selection registers. The automatic base selection is performed when a frequency change is detected
according to the following scheme:
1.
The system scans bank 1 data rate associations to see if the bank 1 is assigned for that data rate.
2.
If bank 1 is assigned, then the bank 1 coefficients will be loaded.
3.
If it is not then, the system scans the bank 2 to see if bank 1 is assigned for that data rate.
4.
If bank 2 is assigned, then the bank 2 coefficients will be loaded.
5.
If it is not then, the system loads the bank 3 coefficients.
The default is that all frequencies are enabled for Bank 1. This default is expressed as a value of all 1s in the
Bank 1 auto-selection byte and all 0s in the bank 2 auto
section byte.
2.5.2.1
Coefficients Write Operations While Automatic Bank Switch Is Enabled
In automatic mode if a write occurs to the Tone coefficient, the bank that is written to is the current bank.
2.5.3 Bank Set
Bank set is used to provide a secure way to update the bank coefficients in both the manual and automatic
switching modes without causing a bank switch to occur. Bank set mode does not alter the current bank
register mapping. It simply enables any bank’s coefficients to be updated while inhibiting any bank switches
from taking place. In manual mode, this enables the coefficients to be set without switching banks. In automatic
mode this prevents a clock error or data rate change from corrupting a bank coefficient write.
To update the coefficients of a bank, a value of 4, 5, or 6 is written into in the bank selection bits of the bank
control register. This enables the tone coefficient values of bank 1, 2, or 3 to be respectively updated.
Once the coefficients of the bank have been updated, the bank selection bits are then returned to the desired
manual or automatic bank selection mode.
2.5.4 Bank Switch Timeline
After a bank switch is initiated (manual or automatic), no I
2
C writes to the TAS5028A should occur before a
minimum of 186 ms. This value is determined by the volume ramp rates for a particular sample rate.
2.5.5 Bank Switching Example 1
Problem: The audio unit containing a TAS5028A needs to handle different audio formats with different sample
rates. Format #1 requires Fs = 32 kHz, Format #2 requires Fs = 44.1 kHz, and Format #3 requires Fs = 48 kHz.
The sample-rate dependent parameters in the TAS5028A require different coefficients and data depending
on the sample rate.
相關(guān)PDF資料
PDF描述
TAS5028APAG 8 Channel Digital Audio PWM Processor
TAS5028APAGG4 8 Channel Digital Audio PWM Processor
TAS5028APAGR 8 Channel Digital Audio PWM Processor
TAS5028APAGRG4 8 Channel Digital Audio PWM Processor
TAS5028PAGR 8 Channel Digital Audio PWM Processor
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TAS5028APAG 功能描述:音頻放大器 8Ch Dig Aud PWM Proc RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TAS5028APAGG4 功能描述:音頻放大器 8Ch Dig Aud PWM Proc RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TAS5028APAGR 功能描述:音頻放大器 8Ch Dig Aud PWM Proc RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TAS5028APAGRG4 功能描述:音頻放大器 8Ch Dig Aud PWM Proc RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TAS5028PAG 功能描述:音頻 DSP 8 Ch Digital Audio PWM Processor RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube
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