LM98519 datasheet(21/59 Pages) TI2

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VREFTOUT

VREFTIN1

VREFBIN2

VREFBOUT

VREFTIN2

VREFBIN1

0.1 F

1 F

0.1 F

LM98519

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SNAS425C – OCTOBER 2007 – REVISED OCTOBER 2014

Feature Description (continued)

7.3.3 AFE References

A low noise reference structure is incorporated in the LM98519. Outputs (VREFTOUT approx. 2.23 V,

VREFBOUT approx. 0.98V) and inputs (VREFTIN1, VREFTIN2, VREFBIN1, VREFBIN2) are provided to allow

decoupling capacitors to be connected. VREFTOUT should be connected to VREFTIN1 and VREFTIN2.

VREFBOUT should be connected to VREFBIN1 and VREFBIN2. Recommended capacitance is 1.0 µF between

the top and bottom reference source, with 0.1 µF to AGND from both the top and bottom reference source.

Connection and decoupling capacitor traces should all be as short as possible, and digital signals should be kept

away from this area. Internal connections from VREFTOUT to VREFTIN1,2 and VREFBOUT to VREFBIN1,2 are

present to reduce the impedance between outputs and inputs, but external connections should still be used for

the best performance

Figure 15. Reference Decoupling Example

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LM98519 Datasheet(PDF) 21 Page - Texas Instruments