Board description

AN2995

2/13

Doc ID 15840 Rev 1

1

Board description

This board is designed with versatility in mind. In particular, its components allow it to be

configured as:

●

a low-pass Sallen-Key circuit.

●

a high-pass Sallen-Key circuit.

●

a differential amplifier.

●

an AC-coupled circuit.

●

an in-loop compensation circuit.

●

an out-of-loop compensation circuit.

●

and numerous other possible configurations not described here.

The board is designed for surface-mounted components in SOT23-5 (and SOT23-6) or

SC70-5 (SC70-6) packages. It can be used to perform on-board characterization prior to the

integration of STMicroelectronics’ products in your designs. Resistor and capacitor

footprints are implemented in the 0805 series.

A set of two decoupling capacitors have been implemented on both power supply pins so as

to benefit from the maximum performances of ST products. In order to reject a wide range of

frequencies, 100 nF and 4.7 µF are good values for these capacitors.

Figure 1.

Demonstration board schematics

Z1

Z6

Z2

Z5

Z7

Z12

Z13

Vcc+

Z4

Z9

Z8

Z3

C1

Z14

OP AMP

SHDN

C2

C3

C4

VCC+

VCC-

Vout

Vin2

Vin1

AM04501