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参数资料
| 型号： | TAS5028PAGRG4 |
| 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： | 29/86页 |
| 文件大小： | 1201K |
| 代理商： | TAS5028PAGRG4 |
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TAS5028 Controls and Status
27
SLES112 — June 2004
TAS5028
After the initialization time, the TAS5028 starts the transition to the operational state with the Master volume
set at mute.
Since the TAS5028 has an external crystal time base, following the release of RESET, the TAS5028 sets the
MCLK and data rates and perform the initialization sequences. The PWM outputs are held at a mute state until
the master volume is set to a value other than mute via I2C.
2.2.2 Power Down (PDN)
TheTAS5028 can be placed into the power down mode by holding the PDN terminal low. When power down
mode is entered, both the PLL and the oscillator are shut down. Volume is immediately set to full attenuation
(there is no ramp down). This control uses the PWM mute sequence that provides a low click and pop transition
to the hard mute state (M). A detailed description of the PWM mute sequence is contained in the PWM section.
Power down is an asynchronous operation that does not require MCLK to go into the power down state. To
initiate the power-up sequence requires MCLK to be operational and the TAS5028 to receive 5 MCLKs prior
to the release of PDN.
As long as the PDN terminal is held low the device is in the power down state with the PWM outputs in a hard
mute (M) state. During power down, all I2C and serial data bus operations are ignored. Table 2 - 3 shows the
device output signals while PDN is active.
Table 2 - 3. Device Outputs During Power Down
SIGNAL
SIGNAL STATE
Valid
Low
PWM P-outputs
M-state = low
PWM M-outputs
M-state = low
SDA
Signal input
Following the application of PDN, the TAS5028 does not perform a quiet shutdown to prevent clicks and pops
produced during the application (the leading edge) of this command. The application of PDN immediately
performs a PWM stop. A quiet stop sequence can be performed by first applying MUTE before PDN.
When PDN is released, the system goes to the end state specified by MUTE and BKND_ERR pins and the
I2C register settings.
The crystal time base allows the TAS5028 to determine the CLK rates. Once these rates are determined, the
TAS5028 unmutes the audio.
2.2.3 Backend Error (BKND_ERR)
Backend error is used to provide error management for backend error conditions. Backend error is a level
sensitive signal. Backend error can be initiated by bringing the BKND_ERR terminal low for a minimum 5
MCLK cycles. When BKND_ERR is brought low, the PWM sets either six or eight channels into the PWM
backend error state. This state is described in the PWM section. Once the backend error sequence is initiated,
a delay of 5 ms is performed before the system starts the output re - initialization sequence. After the
initialization time, the TAS5028 begins normal operation. Backend error does not affect other PWM modulator
operations
The number of channels that are affected by the BKND_ERR signal is dependent upon the 6-channel
configuration signal. If the I2C setting 6-channel configuration is false, the TAS5028 places all eight PWM
outputs in the PWM backend error state, while not affecting any other internal settings or operations. If the
I2C setting six configuration is true, the TAS5028 brings the PWM outputs 1 - 6 to a backend error state, while
not affecting any other internal settings or operations. Table 2 - 4 shows the device output signal states during
backend error.
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相关代理商/技术参数 |
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| TAS5036 | 制造商:TI 制造商全称:Texas Instruments 功能描述:SIX CHANNEL DIGITAL AUDIO PWM PROCESSOR |
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| TAS5036A_06 | 制造商:TI 制造商全称:Texas Instruments 功能描述:Six Channel Digital Audio PWM Processor |
| TAS5036AIPFC | 功能描述:音频放大器 Digital Audio PWM Processor 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 |
| TAS5036AIPFCG4 | 功能描述:音频放大器 Digital Audio PWM Processor 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 |
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