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| 型号： | TDA7572 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQFP64 |
| 封装： | ROHS COMPLIANT, HIQUAD-64 |
| 文件页数： | 40/64页 |
| 文件大小： | 1052K |
| 代理商： | TDA7572 |
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TDA7572
DAC
In case of Fratio = "11" the configuration is still for full band. The input sample rate for this
case is 192kHz (Fs) and the first x4 interpolator has to be implemented off-line in the DSP.
For the first x2 interpolator could be used the precedent, for the second one should be used
the following:
Coefficients: -190, 1199,2047,…
To implement the first interpolator are necessary 28 memory access, 14 sum and14 MAC
(multiply with accumulation) at rate Fs. For the second one are, instead, enough 4 memory
access, 2 sum and 2 MAC at rate 2Fs. In the following schematic is reported the structure
for the two interpolator eventually to implement in the DSP.
Figure 8.
Two interpolator structure diagram
The I2S format is used to transfer audio samples:
Figure 9.
I2S format diagram
Where the WS is a clock at frequency Fs(48,96,192kHz) and discern which channel is
transferred, where the SCL is the interface clock at 64*Fs(3.07, 6.14, 12.29MHz). The SDA
are the bit transferred, 32 for each channel. Only the first 18 bits are taken into account and
only one channel. The Control register bit L/R selects the channel amplified.
The internal clock used to clock the DAC logic is obtained from the PLL that lock to the I2S
clock present on pin SCL. In order to work the PLL needs a RC series network connected to
pin PLL/INLEVEL0 (pin 44). Optimal value are C=100nF, R=33Ohm with in parallel an 1.8pF
capacitance
Oversampling
Increasing word rate from 2Fs to 4Fs.
Filter
Type
Remez filter, half band
Taps, bit
7, 12
Attenuation
50db attenuation out of 0.77*(2Fs)
Coefficients It is an Half-Band filter then we have only 3
coefficients (see following)
RAM
32x18bit
REG
18
bit
18
bit
19
bit
12
bit
30
bit
ROM
16x12bit
34
bit
AC00020
AC00021
WS
SCL
SDA
MSB
LSB
MSB
RIGHT
LEFT
MSB
LSB
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TDA7572TR | 功能描述:音频放大器 200W Mono Bridge PWM Amplifier Built-In 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 |
| TDA7575 | 功能描述:音频放大器 MULTI F DUAL 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 |
| TDA7575B | 功能描述:音频放大器 2 x 75W Multifunct Dual-Bridge 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 |
| TDA7575BPD | 功能描述:音频放大器 2 x 75W Multifunct Dual-Bridge 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 |
| TDA7575BPDTR | 功能描述:音频放大器 2 x 75W Multifunct Dual-Bridge 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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