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| 型号： | TAS5508PAGR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封装： | GREEN, PLASTIC, TQFP-64 |
| 文件页数： | 55/105页 |
| 文件大小： | 1286K |
| 代理商： | TAS5508PAGR |
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3.5.5
Bank-Switching Example 1
3.5.6
Bank-Switching Example 2
TAS5508
8-Channel Digital Audio PWM Processor
www.ti.com
SLES091D – FEBRUARY 2004 – REVISED JULY 2009
Problem: The audio unit containing a TAS5508 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 TAS5508 require different coefficients and
data depending on the sample rate.
Strategy: Use the TAS5508 bank-switching feature to allow for managing and switching three banks
associated with the three sample rates, 32 kHz (bank 1), 44.1 kHz (bank 2), and 48 kHz (bank 3).
One possible algorithm is to generate, load, and automatically manage bank switching for this problem:
1. Generate bank-related coefficients for sample rates of 32 kHz, 44.1 kHz, and 48 kHz, and include the
same in the microprocessor-based TAS5508 I2C firmware.
2. On TAS5508 power up or reset, the microprocessor runs the following TAS5508 initialization code:
a.
Update bank 1 (write 0x0004 8040 to register 0x40).
b.
Write bank-related I2C registers with appropriate values for bank 1.
c.
Write bank 2 (write 0x0005 8040 to register 0x40).
d.
Load bank-related I2C registers with appropriate values for bank 2.
e.
Write bank 3 (write 0x0006 8040 to register 0x40).
f.
Load bank-related I2C registers with appropriate values for bank 3.
g.
Select automatic bank switching (write 0x0003 8040 to register 0x40).
3. When the audio media changes, the TAS5508 automatically detects the incoming sample rate and
automatically switches to the appropriate bank.
In this example, any sample rates other than 32 kHz and 44.1 kHz use bank 3. If other sample rates are
used, then the banks must be set up differently.
Problem: The audio system uses all of the sample rates supported by the TAS5508. How can the
automatic bank switching be set up to handle this situation?
Strategy: Use the TAS5508 bank-switching feature to allow for managing and switching three banks
associated with sample rates as follows:
Bank 1: Coefficients for 32 kHz, 38 kHz, 44.1 kHz, and 48 kHz
Bank 2: Coefficients for 88.2kHz and 96 kHz
Bank 3: Coefficients for 176.4 kHz and 192 kHz
One possible algorithm is to generate, load, and automatically manage bank switching for this problem:
1. Generate bank-related coefficients for sample rates 48 kHz (bank 1), 96 kHz (bank 2), and 192 kHz
(bank 3) and include the same in the microprocessor-based TAS5508 I2C firmware.
2. On TAS5508 power up or reset, the microprocessor runs the following TAS5508 initialization code:
a.
Update bank 1 (write 0x0004 F00C to register 0x40).
b.
Write bank-related I2C registers with appropriate values for bank 1.
c.
Write bank 2 (write 0x0005 F00C to register 0x40).
d.
Load bank-related I2C registers with appropriate values for bank 2.
e.
Write bank 3 (write 0x0006 F00C to register 0x40).
f.
Load bank-related I2C registers with appropriate values for bank 3.
g.
Select automatic bank switching (write 0x0003 F00C to register 0x40).
3. When the audio media changes, the TAS5508 automatically detects the incoming sample rate and
automatically switches to the appropriate bank.
TAS5508 Controls and Status
53
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| TAS5508PAGRG4 | 功能描述:音频 DSP 8Ch Dig Aud PWM Proc RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
| TAS5514BQ1DKDEVM | 功能描述:音频 IC 开发工具 TAS5514BQ1DKD EVAL MOD RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| TAS5514BTDKDRQ1 | 功能描述:音频放大器 4-CH Auto Digital Amps RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TAS5518 | 制造商:TI 制造商全称:Texas Instruments 功能描述:TAS5518 8 Channel Digital Audio PWM Processor |
| TAS5518_06 | 制造商:TI 制造商全称:Texas Instruments 功能描述:8 Channel Digital Audio PWM Processor |
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