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参数资料
| 型号： | SA572DTBR2 |
| 厂商： | ON Semiconductor |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC COMPANDOR 2CHAN GAIN 16-TSSOP |
| 产品变化通告： | Product Obsolescence 08/Apr/2011 |
| 标准包装： | 2,500 |
| 类型： | 压缩扩展器 |
| 应用： | 自动电平控制，立体声扩展器 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 带卷 (TR) |
SA572
http://onsemi.com
5
The residual distortion is third harmonic distortion and
is caused by gain control ripple. In a compandor system,
available control of fast attack and slow recovery improve
ripple distortion significantly. At the unity gain level of
100 mV, the gain cell gives THD (total harmonic
distortion) of 0.17% typ. Output noise with no input signals
is only 6.0
mV in the audio spectrum (10 Hz-20 kHz). The
output current IO must feed the virtual ground input of an
operational amplifier with a resistor from output to
inverting input. The non-inverting input of the operational
amplifier has to be biased at VREF if the output current IO
is DC coupled.
VREF
THD
TRIM
V+
1
2
IG )
1
2
IO
I1
140mA
280mA
I2
IG
IO
Q4
Q3
Q1
Q2
VIN
+
A1
Figure 3. Basic Gain Cell Schematic
R1
6.8kW
Rectifier
The rectifier is a full-wave design as shown in Figure 4.
The input voltage is converted to current through the input
resistor R2 and turns on either Q5 or Q6 depending on the
signal polarity. Deadband of the voltage to current
converter is reduced by the loop gain of the gain block A2.
If AC coupling is used, the rectifier error comes only from
input bias current of gain block A2. The input bias current
is typically about 70 nA. Frequency response of the gain
block A2 also causes second-order error at high frequency.
The collector current of Q6 is mirrored and summed at the
collector of Q5 to form the full wave rectified output
current IR. The rectifier transfer function is:
IR +
VIN * VREF
R2
(eq. 3)
If VIN is AC-coupled, then the equation will be reduced
to:
IRAC +
VIN(AVG)
R2
The internal bias scheme limits the maximum output
current IR to be around 300 mA. Within a "1.0 dB error
band the input range of the rectifier is about 52 dB.
VIN
VREF
V+
A2
+
IR +
VIN * VREF
R2
Figure 4. Simplified Rectifier Schematic
Q5
Q6
R2
D7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SA572DTBR2G | 功能描述:音频放大器 ANA COMPANDOR DUAL CHANEL 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 |
| SA572F | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Programmable analog compandor |
| SA572N | 功能描述:音频放大器 Dual Channel Hi Perf 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 |
| SA572NG | 功能描述:音频放大器 Dual Channel Hi Perf Compandor Ind. Temp 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 |
| SA575 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Low voltage compandor |
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