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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： | 39/64页 |
| 文件大小： | 1052K |
| 代理商： | TDA7572 |
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DAC
TDA7572
8
DAC
A one channel DAC is provided. A balance between die area and functionality has been
made - the interpolator function required for full bandwidth operation has been off-loaded to
an external DSP. This allows Bass-only operation of the DAC without any processing
assistance, while full bandwidth audio requires external interpolation assistance.
The DAC has a differential output:
●
positive output DAC1(32)
●
negative output DAC2(31)
On these pins are present a four level squared wave, composed by the differences of two
PWM wave have one an amplitude 16 times lower than the other. The output voltage on
DAC1 and DAC2 is compatible to the digital supply VDIG.
Figure 7.
DAC circuit diagram
where is filtered by means of capacitors and put in the AOUT Differential to single-ended
input, as reported in the picture above. The maximum signal present output of converter is
1.4 Vrms. The setting to use for the Diff-to-SE converter is Gain= -3dB
(INLEVEL1=0,INLEVEL0=0).
Communication is through a standard I2S port. I2C is available too.
Acting on the I2C Control registers it is possible turn-on the DAC (DACEnb) and choose the
configuration (Fratio(1:0)). With Fratio = "00"/"01" the configuration is for bass only. The
Input sample frequency is 48kHz (Fs). In case of Fratio = "10" the configuration is for full
band. The input sample rate for this case is 96kHz (Fs) and the first x2 interpolator has to be
implemented off-line in the DSP. A well checked structure to realize could be the following:
Coefficients: -11,11,-16,22,-30,40,-53,69,-91,122,-168,247,-426,1300,2047,1300,….
Oversampling
Increasing word rate from Fs to 2Fs.
Filter
Type
Remez filter, half band
Taps, bit
57, 12
Attenuation
50db attenuation out of 0.55Fs
Coefficients It is an Half-Band filter then we have only 15
coefficients (see following)
CF
R=20k
SVR/DGND
CF
RF=4.7k
RF
AC00019
R=2.5k
INP
INM
DAC2
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相关代理商/技术参数 |
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|---|---|
| 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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