AN2240

Demonstration board connectors

Doc ID 11677 Rev 4

3/9

2

Demonstration board connectors

Caution:

When you apply the power supply through P3, DO NOT invert the polarity. Doing so will

destroy the amplifier at U1.

Table 1.

Demonstration board connector description

Connector

Description

P1

Input signal connector (GND, positive and negative input signal).

P2

Output signal connector (GND, positive and negative output signal).

P3

P4

Standby puts the TS472 in operating mode. A short-circuit between GND and Standby

puts the TS472 in standby mode.

P5

Selection connector for gain select pin. There are several

possibilities for the value of the TS472 gain. The value of the gain is

written directly on the PCB. For instance, to set the TS472 with a

gain of 20 dB, the jumper must be placed as shown in the diagram.

P6

Internal microphone 2.0 V bias voltage connector. P7 must be floating.

P7

External microphone bias voltage connector (Vx and GND). P6 must be open.

0dB

10dB

20dB

-1.5dB/min

40dB

30dB

41dB/max