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Format Control

Gain Control

Output Configuration Control

TAS5704

SLOS563 – MARCH 2008

The digital data input format is selected via three external terminals (FORMAT0, FORMAT1, and FORMAT2).

Table 1 lists the corresponding data format for SDIN1 and SDIN2. LRCLK and SCLK are shared clocks for

SDIN1 and SDIN2. Changes to the FORMATx terminals are latched in immediately on a rising edge of RESET.

Changes to the FORMATx terminals while RESET is high are not allowed.

Table 1. Format Control

SERIAL DIGITAL DATA

FORMAT2

FORMAT1

FORMAT0

FORMAT

0

0

0

16-Bit right-justifed

0

0

1

18-Bit right-justified

0

1

0

20-Bit right-justified

0

1

1

24-Bit right-justified

1

0

0

1

0

1

16-, 24-Bit left-justified

1

1

0

Reserved. Setting is not allowed.

1

1

1

Reserved. Setting is not allowed.

The gain of the DAP is selected via two external gain pins (GAIN_0 and GAIN_1). Table 2 lists the corresponding

channel gain (for ALL channels) for GAIN_0 and GAIN_1 settings. Individual channel gain is not possible.

Changes to the GAIN_x terminals are latched in immediately on a rising edge of RESET. Changes to the

GAIN_x terminals while RESET is high are not allowed.

Table 2. Gain Control

OUTPUT VOLTAGE

CHANNEL

WITH FULL SCALE

GAIN_1

GAIN_0

GAIN (dB)

BTL

0

0

-3

17.56

0

1

3

1

0

9

1

1

12

(1)

Output clipped. See the calculation example in the Application

section.

The PWM outputs can be remapped to allow 2-ch, 2.1-ch, and 4-ch operation. Two terminals are used for this

mapping, CONFIG_1 and CONFIG_2. Table 3 lists the output configurations that are supported. Changes to the

CONFIG_x terminals are latched in immediately on a rising edge of RESET. Changes to the CONFIG_x

terminals while RESET is high are not allowed.

Table 3. Output Configurations

CONFIG_2

CONFIG_1

OUTPUT CONFIGURATION

2-Ch Mode, BTL, AD modulation. SUB+/- is derived from the SDIN2

0

0

input (left channel). SUB+/- is AD modulation with SUB- equal to the

compliment of SUB+.

2-Ch Mode, BTL, BD modulation. SUB+/- is derived from the SDIN2

0

1

input (left channel), and SUB+/- is BD PWM.

2.1-Ch Mode (2xSE outputs, 1xBTL output). AD modulation. No SUB+/-

1

0

PWM output.

1

1

4-Ch Mode (4xSE outputs). AD modulation. No SUB+/- PWM output.

Copyright © 2008, Texas Instruments Incorporated

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