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| 型号： | TAS5709APHPR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 20.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48 |
| 封装： | 7 X 7 MM, GREEN, PLASTIC, HTQFP-48 |
| 文件页数： | 10/60页 |
| 文件大小： | 1210K |
| 代理商： | TAS5709APHPR |
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Overtemperature Protection
Undervoltage Protection (UVP) and Power-On
SSTIMER FUNCTIONALITY
CLOCK, AUTODETECTION, AND PLL
SERIAL DATA INTERFACE
PWM Section
SLOS599A – NOVEMBER 2008 – REVISED SEPTEMBER 2009 ..................................................................................................................................... www.ti.com
The TAS5709 has an overtemperature-protection system. If the device junction temperature exceeds 150°C
(nominal), the device is put into thermal shutdown, resulting in all half-bridge outputs being set in the
high-impedance (Hi-Z) state and FAULT being asserted low. The TAS5709 recovers automatically once the
temperature drops approximately 30°.
Reset (POR)
The UVP and POR circuits of the TAS5709 fully protect the device in any power-up/down and brownout situation.
While powering up, the POR circuit resets the overload circuit (OLP) and ensures that all circuits are fully
operational when the PVDD and AVDD supply voltages reach 7.6 V and 2.7 V, respectively. Although PVDD and
AVDD are independently monitored, a supply voltage drop below the UVP threshold on AVDD or either PVDD
pin results in all half-bridge outputs immediately being set in the high-impedance (Hi-Z) state and FAULT being
asserted low.
The SSTIMER pin uses a capacitor connected between this pin and ground to control the output duty cycle when
exiting all-channel shutdown. The capacitor on the SSTIMER pin is slowly charged through an internal current
source, and the charge time determines the rate at which the output transitions from a near-zero duty cycle to the
desired duty cycle. This allows for a smooth transition that minimizes audible pops and clicks. When the part is
shut down, the drivers are high-impedance and transition slowly down through a 3-k
resistor, similarly
minimizing pops and clicks. The shutdown transition time is independent of the SSTIMER pin capacitance.
Larger capacitors increase the start-up time, whereas capacitors smaller than 2.2 nF decrease the start-up time.
The SSTIMER pin should be left floating for BD modulation.
The TAS5709 is a slave device. It accepts MCLK, SCLK, and LRCLK. The digital audio processor (DAP)
supports all the sample rates and MCLK rates that are defined in the clock control register.
The TAS5709 checks to verify that SCLK is a specific value of 32 fS, 48 fS, or 64 fS. The DAP only supports a 1 ×
fS LRCLK. The timing relationship of these clocks to SDIN is shown in subsequent sections. The clock section
uses MCLK or the internal oscillator clock (when MCLK is unstable, out of range, or absent) to produce the
internal clock (DCLK) running at 512 times the PWM switching frequency.
The DAP can autodetect and set the internal clock-control logic to the appropriate settings for all supported clock
rates as defined in the clock-control register.
TAS5709 has robust clock error handling that uses the bulit-in trimmed oscillator clock to quickly detect
changes/errors. Once the system detects a clock change/error, it mutes the audio (through a single-step mute)
and then forces the PLL to limp using the internal oscillator as a reference clock. Once the clocks are stable, the
system autodetects the new rate and reverts to normal operation. During this process, the default volume is
restored in a single step (also called hard unmute). The ramp process can be programmed to ramp back slowly
(also called soft unmute) as defined in volume register (0x0E).
Serial data is input on SDIN. The PWM outputs are derived from SDIN. The TAS5709 DAP accepts serial data in
16-, 20-, or 24-bit left-justified, right-justified, and I2S serial data formats.
The TAS5709 DAP device uses noise-shaping and sophisticated nonlinear correction algorithms to achieve high
power efficiency and high-performance digital-audio reproduction. The DAP uses a fourth-order noise shaper to
increase dynamic range and SNR in the audio band. The PWM section accepts 24-bit PCM data from the DAP
and outputs two BTL PWM audio output channels.
The PWM section has individual-channel dc-blocking filters that can be enabled and disabled. The filter cutoff
frequency is less than 1 Hz. Individual channel de-emphasis filters for 44.1 kHz and 48 kHz are included and can
be enabled and disabled.
18
Copyright 2008–2009, Texas Instruments Incorporated
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| TAS5709APHP | 20.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TAS5709EVM | 功能描述:音频 IC 开发工具 TAS5709EVM 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 |
| TAS5709PHP | 功能描述:音频放大器 20W Stereo I2S input Aud Pwr Amp 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 |
| TAS5709PHPG4 | 功能描述:音频放大器 20W Stereo I2S input Aud Pwr Amp 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 |
| TAS5709PHPR | 功能描述:音频放大器 20W Stereo I2S input Aud Pwr Amp 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 |
| TAS5709PHPRG4 | 功能描述:音频放大器 20W Stereo I2S input Aud Pwr Amp 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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