參數(shù)資料
型號(hào)： TAS3202PAGR
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝： GREEN, PLASTIC, TQFP-64
文件頁(yè)數(shù)： 10/66頁(yè)
文件大?。?/td> 817K
代理商： TAS3202PAGR
SLES208B – JUNE 2009 – REVISED MARCH 2011
www.ti.com
5
Clock Controls
Clock management for the TAS3202 consists of two control structures:
Master clock management
–
Oversees the selection of the clock frequencies for the 8051 microprocessor, the I2C controller, and
the audio DSP core
–
The master clock (MCLK_IN or XTAL_IN) is the source for these clocks.
–
In most applications, the master clock drives an on-chip digital phase-locked loop (DPLL), and the
DPLL output drives the microprocessor and audio DSP clocks.
–
Also available is the DPLL bypass mode, in which the high-speed master clock directly drives the
microprocessor and audio DSP clocks.
Serial audio port (SAP) clock management
–
Oversees SAP master/slave mode
–
Controls output of SCLKOUT, and LRCLK in the SAP master mode
Input pin MCLK_IN or XTAL_IN provides the master clock for the TAS3202. Within the TAS3202, these
two inputs are combined by an OR gate and, thus, only one of these two sources can be active at any one
time. The source that is not active must be logic 0.
The TAS3202 only supports dynamic sample-rate changes between any of the supported sample
frequencies when a fixed-frequency master clock is provided. During dynamic sample-rate changes, the
TAS3202 remains in normal operation and the register contents are preserved. To avoid producing audio
artifacts during the sample-rate changes, a volume or mute control can be included in the application
firmware that mutes the output signal during the sample-rate change. The fixed-frequency clock can be
provided by a crystal attached to XTAL_IN and XTAL_OUT or an external 3.3-V fixed-frequency TTL
source attached to MCLK_IN.
When the TAS3202 is used in a system in which the master clock frequency (fMCLK ) can change, the
TAS3202 must be reset during the frequency change. In these cases, the procedure shown in Figure 5-1
should be used.
18
Clock Controls
Copyright 2009–2011, Texas Instruments Incorporated
Product Folder Link(s): TAS3202
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TAS3204PAG 功能描述:音頻 DSP Hi Perf Dual Core DSP/MCU Aud Proc 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
TAS3204PAGR 功能描述:音頻 DSP Hi Perf Dual Core DSP/MCU Aud Proc 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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