參數(shù)資料
型號(hào)： TSA1203IFT-E
廠商： STMICROELECTRONICS
元件分類： ADC
英文描述： 2-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, QFP48
封裝： 7 X 7 MM, TQFP-48
文件頁數(shù)： 11/30頁
文件大?。?/td> 440K
代理商： TSA1203IFT-E
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
相關(guān)PDF資料
PDF描述
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
TSA1401IF 1-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP48
TSA1401IFT 1-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP48
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TSA1204 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:DUAL-CHANNEL, 12-BIT, 20MSPS, 120mW A/D CONVERTER
TSA1204_06 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Dual channel 12-bit 20Msps 120mW A/D converter
TSA1204IF 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:DUAL-CHANNEL, 12-BIT, 20MSPS, 120mW A/D CONVERTER
TSA1204IFT 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Dual Channel 12-Bit RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
TSA1204IFT-E 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Dual channel 12-bit 20Msps 120mW A/D converter
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