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参数资料
| 型号： | TSA1203IF |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | ADC |
| 英文描述： | 2-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, QFP48 |
| 封装： | 7 X 7 MM, TQFP-48 |
| 文件页数： | 11/30页 |
| 文件大小： | 440K |
| 代理商： | TSA1203IF |
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TSA1203
Application information
19/30
8.5
Power consumption optimization
The internal architecture of the TSA1203 makes it possible to optimize power consumption
according to the sampling frequency of the application. For this purpose, an external resistor
is placed between IPOL and the analog ground pins. Therefore, the total dissipation can be
optimized over the full sampling range (0.5 Msps to 40 Msps).
The TSA1203 combines the highest performance with the lowest consumption at 40 Msps
when Rpol is equal to 18 kΩ. This value is nevertheless dependent on the application and the
environment.
In the lower sampling frequency range, this value of resistor may be adjusted in order to
decrease the analog current without any degradation of dynamic performance.
Table 12 gives some values to illustrate this.
8.6
Layout precautions
To use the ADC circuits most efficiently at high frequencies, some precautions have to be
taken for power supplies:
●
The implementation of 4 proper separate supplies and ground planes (analog, digital,
internal and external buffer ones) on the PCB is mandatory for high speed circuit
applications to provide low inductance and low resistance common return.
The separation of the analog signal from the digital output part is essential to prevent
noise from coupling onto the input signal. The best compromise is to connect AGND,
DGND, GNDBI in a common point whereas GNDBE must be isolated. Similarly, the
AVCC, DVCC and VCCBI power supplies must be separate from the VCCBE power
supply.
●
Power supply bypass capacitors must be placed as close as possible to the IC pins in
order to improve high frequency bypassing and reduce harmonic distortion.
●
All inputs and outputs must be properly terminated with output termination resistors;
thus, the amplifier load is resistive only and the stability of the amplifier is improved. All
leads must be wide and as short as possible especially for the analog input in order to
decrease parasitic capacitance and inductance.
●
To keep the capacitive loading as low as possible at digital outputs, short lead lengths
of routing are essential to minimize currents when the output changes. To minimize this
output capacitance, use buffers or latches close to the output pins.
●
Choose component sizes as small as possible (SMD).
Table 12.
Total power consumption optimization depending on Rpol value
FS (Msps)
30
35
40
Rpol (kΩ)
38
28
18
Optimized power (mW)
145
180
215
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| TSA1203IFT-E | 2-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, QFP48 |
| TSA1204IFT-E | 2-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP48 |
| TSA1204IFT | 2-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP48 |
| TSA1204IF | 2-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP48 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TSA1203IFT | 功能描述:模数转换器 - ADC Dual Channel 12-Bit RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| TSA1203IFT-E | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Dual-channel 12-bit 40Msps 215mW A/D converter |
| TSA1204 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:DUAL-CHANNEL, 12-BIT, 20MSPS, 120mW A/D CONVERTER |
| TSA1204_06 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Dual channel 12-bit 20Msps 120mW A/D converter |
| TSA1204IF | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:DUAL-CHANNEL, 12-BIT, 20MSPS, 120mW A/D CONVERTER |
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