- 您现在的位置：买卖IC网 > PDF目录196394 > TDA7572 (STMICROELECTRONICS) SPECIALTY ANALOG CIRCUIT, PQFP64 PDF资料下载
参数资料
| 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： | 31/64页 |
| 文件大小： | 1052K |
| 代理商： | TDA7572 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页当前第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页
TDA7572
Input stage and gain compressor
6
Input stage and gain compressor
6.1
Input stage
The input stage accepts differential analog audio and provides a single ended output that is
referenced to SVR, a slowly changing reference signal that is close to VCC/2. This signal is
present on the pin 6 (SVR). Four input stage gains are selectable, chosen such that input
signal levels of either 2VRMS, 2.6VRMS, 7VRMS, or 9.7VRMS will provide full scale unclipped
output swing of this stage.
The variable gain is realized by a single ended input attenuator (with respect to SVR), such
that both differential and common-mode voltages are attenuated, and by, mean of a
reconfiguration of the Op-Amp feedback.
These are controlled by two bits, one controlling the input attenuator, and the other
controlling the Op-Amp configuration. The bits INLEVEL0 in the InputControl register
(register addr 1, bit 1) and INLEVEL1 in the Modulator register (register addr. 5, bit 2)
determine the gain selection. The default value of INLEVEL0 and INLEVEL1 bits are
determined by the voltage levels at power-up on pins PLL/INLEVEL0 (pin 63) pin and
SCL/INLEVEL1 (pin 62) respectively allowing gain selection without the requirement of an
I2C bus. INLEVEL0 controls the input attenuator, and INLEVEL1 controls the configuration
of the feedback around the op. amp.
INP - pin 12
: positive input
INM - pin 13
: negative input
AOUT - pin 14
: output
SCL/INLEVEL1 - pin62
: gain selection bit 1
PLL/INLEVEL0 - pin63
: gain selection bit 0
This stage is powered from ±2.5Volts, centered around SVR. Output swing is nominally ±2
volts. The input common mode range is a function of the gain setting, the electrical
parameters section must be consulted for details. It is expected that the inputs will be ac
coupled, and because of this consideration must be given to the rate of change of SVR, as
rapid changes to SVR could cause the inputs of this amplifier to run out of common mode
range. i.e. the input decoupling capacitors can not charge fast enough to keep up with SVR
6.2
Gain compressor
A gain compressor is integrated in the front end of this stage, which provides up to 16dB of
differential attenuation in approximately 0.5dB steps, varying somewhat depending on gain
configuration. Compressor aggressiveness is programmable by the I2C data/AttackSel pin
(providing a choice from two attack-time/decay-time pairs) in non-I2C bus mode, or by I2C
bus with 2 bits each for attack and decay and 2 bits for the distortion-to-attenuation table.
These are bits ATTACK[1:0], DECAY[1:0], and TABLE[1:0] in the InputControl register. The
ADDR1/CompEnable pin is used in non-I2C mode to enable or disable gain compression
entirely.
The gain compressor operates by monitoring the estimated in THD due to clipping, over-
modulation or over-current and commanding a change in the input attenuation based on the
THD estimate. The input attenuator has 32 discrete steps. THD is estimated by measuring
the time period between zero crossings where there is no clipping and the time when there
相关PDF资料 |
PDF描述 |
|---|---|
| TDSO1160-KL | 7 SEG NUMERIC DISPLAY, ORANGE RED, 7 mm |
| TE-4Q4TM2MH2% | 1 ELEMENT, 2000 uH, GENERAL PURPOSE INDUCTOR |
| TD-4Q3TA2H+/-1% | 1 ELEMENT, 2000000 uH, GENERAL PURPOSE INDUCTOR |
| TD-5Q4TW10MH+/-1% | 1 ELEMENT, 10000 uH, GENERAL PURPOSE INDUCTOR |
| TD-5Q4TW100MH+/-1% | 1 ELEMENT, 100000 uH, GENERAL PURPOSE INDUCTOR |
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 |
发布紧急采购，3分钟左右您将得到回复。