PS081 datasheet(85/155 Pages) AMSCO

85 / 155 page

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4-28

PSØ81

Recommendations:

Table 4.4 LDO Recommendations

LDO

Features

Low-pass filter

Applications

Torex XC2206

medium noise, low cur-

rent

use good low-pass filter

Solar

Micrel MC5205

medium noise, cheap

solution

use medium low-pass

filter

Low-cost solutions

Linear LT1761-BYP

very low noise, costly

solution

use standard low-pass

filter

High-end applications

TI TPS71501

very high noise

NOT RECOMMENDED!!!

Of course this list is far away from being complete. It shall just give some recommendations accor-

ding to our experience in practical tests. Basically every low-noise, low-current LDO is suitable to use.

Caution: Please do NOT use the TI TPS71501 LDO as we saw major problems due to the noise of

this regulator!

The additional low-pass filtering can help to reduce the noise getting through to the chip. Different

types of low-pass filters can be used before decoupling the voltages:

Figure 4.21 Example for a good low pass filtering

The good low-pass filter can reduce the noise coming from the LDO so that in combination with the

decoupling of the voltages supplying the PS081 are widely noise-free or at least minimized. If the noi-

se from the LDO is lower (like with the Linear or Micrel type i.e.) a simpler lowpass filter can be used,

like the following:

Figure 4.22 Example for medium and standard low pass filtering

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