AN2474

Description of the evaluation board

3/7

2

Description of the evaluation board

The DEMO TS4995 is an evaluation board designed to help you evaluate the TS4995 low

power differential audio amplifier.

This section explains how to evaluate the amplifier in a typical application configuration.

Using the board, you can:

●

set the amplifier in standby/operation mode,

●

select standby mode (active low or active high),

●

modify the input configuration from capacitor coupled to common mode feedback.

The Cn4 connector is used to select between standby or operation mode; and the Cn5

connector is used for standby to select between active low or active high. For example, in

Figure 2, the jumper that connects pin 2 and pin 3 of the Cn4 connector puts the device in

standby mode, while the jumper that connects pin1 and pin 2 of the Cn5 connector

determines that the standby is active high.

When the amplifier is used in common mode feedback input configuration, the input

capacitors are shorted by placing jumpers on connectors Cn2 and Cn3.

Figure 2.

Evaluation board schematic diagram

+

5

3

2

13

9

Vin-

Vin+

STBY

Vo-

Vo+

BIAS

STBY

BYPA SS

STBY MODE

TS4995

U1

1

2

JP2

1

2

330nF

Cin1

1

2

330nF

Cin2

1uF

Cb

1uF

Cs

1

2

3

Cn4

1

2

3

Cn5

Cn1

1

2

3

4

JP1

Cn2

Cn3

VCC

VCC

VCC