AN3001

Description of the demonstration board

Doc ID 15911 Rev 1

3/12

2

Description of the demonstration board

The TS4657 demonstration board has been designed for evaluation purposes. The TS4657

device is soldered on a two-layer PCB.

Some key features of the TS4657 can be directly controlled through connectors or jumpers

on the demonstration board (Table 1).

Caution:

When you apply the power supply through J5, do not invert the polarity as doing so will

damage the chip.

Table 1.

Demonstration board connectors

Connector

Description

J1

MCLK: master clock input

J2

BCLK: bit clock input

J3

SDAT: serial data input

J4

LRCLK: left right clock input (channel selector input)

J5

3.0 to 5.5 V.

J6

Left audio output

J7

Right audio output

JP1

Allows selection of level on Format1 pin. Format1 and Format2 pins select the digital

input format (see section 4.1.2 Digital audio input format in the TS4657 datasheet).

If the jumper is removed, it is possible to control the Format1 by an external logic

signal (see section 3.3 DAC and output stage performances in the TS4657

datasheet).

JP2

Allows selection of level on Format2 pin. Format1 and Format2 pins select the digital

input format (see section 4.1.2 Digital audio input format in the TS4657 datasheet).

If the jumper is removed, it is possible to control the Format2 by an external logic

signal (see section 3.3 DAC and output stage performances in the TS4657

datasheet).

JP3

Controls the chip standby (JP1:1-2 = circuit activated, 2-3 = circuit in standby mode).

If the jumper is removed, it is possible to control the standby by an external logic

signal (see section 3.3 DAC and output stage performances in the TS4657

datasheet).

JP4

Allows connection of the C6 capacitor (used for the left output filter;

see Section 3.3: Output filters on page 6).

JP5

Allows short-circuiting of the R5 resistor (used for the left output filter; see

Section 3.3: Output filters on page 6).

JP6

Allows connection of the C7 capacitor (used for the right output filter; see

Section 3.3: Output filters on page 6).

JP7

Allows short-circuiting of the R7 resistor (used for the right output filter; see

Section 3.3: Output filters on page 6).