Contents

AN4451

2/15

DocID025985 Rev 1

Contents

1

How does the UV sensor work ....................................................... 3

1.1

Signal conditioning of the UV sensor ................................................ 3

1.2

Application example .......................................................................... 4

1.3

Input offset voltage (Vio) ................................................................... 4

1.4

Feedback resistance ......................................................................... 4

1.5

Input bias current (Iib) ....................................................................... 5

1.6

UV sensor equivalent circuit.............................................................. 5

1.7

Resistors Rs and Rj .......................................................................... 5

1.8

Capacitors Cj, Cin, and Cf................................................................. 6

2

Stability of the UV sensor ............................................................... 8

3

Noise reduction ............................................................................. 11

4

Output voltage limitation .............................................................. 12

5

Conclusion..................................................................................... 13

6

Revision history ............................................................................ 14