Description of the demonstration board

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Description of the demonstration board

The TS4999 demonstration board is designed to evaluate the TS4999, a fully-differential

class D stereo power amplifier. The TS4999 device, in a flip-chip package, is mounted on a

four-layer PCB. Easily-accessible connectors on the board allow changing or driving the

gain select pins (G0 and G1), the standby control pins for the left and right channels (STBL

and STBR) and the 3D sound effect pin (3D).

The differential gain of the TS4999 can be set to 3.5, 6, 9.5, or 12 dB, depending on the

logic level of the G0 pin (connected to pin 2 of S1) and G1 pin (connected to pin 2 of S2).

Note:

An internal 300 k

pins are floating (S1 and S2 included), the gain is 3.5 dB. In full standby (left and right

channels OFF), these resistors are disconnected (HiZ input).

Table 1.

Gain settings with G0 and G1 pins

G1

G0

S1

S2

Gain (dB)

Gain (V/V)

00

3.5

1.5

01

62

10

9.5

3

11

12

4

`

12

3

`

12

3

`

12

3

`

12

3

`

12

3

`

12

3

`

12

3

`

12

3

Table 2.

Truth table for 3D effect pin and STANDBY pins

3D

STBYL

STBYR

3D Effect

Left channel

Right channel

0

0

0

X

STDBY

STDBY

001

OFF

STDBY

ON

010

OFF

ON

STDBY

011

OFF

ON

ON

1

0

0

X

STDBY

STDBY

1

0

1

N/A

N/A

N/A

1

1

0

N/A

N/A

N/A

1

1

1

ON

ON

ON