4 gain jumpers, 5 data format jumpers, 6 config jumpers – Texas Instruments TA5704EVM User Manual
Page 12: Jumpers, Format
3.4
GAIN Jumpers
3.5
Data Format Jumpers
3.6
CONFIG Jumpers
Jumpers and Control Utilities
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GAIN0 and GAIN1 jumpers enable the user to change the gain of the device. It is important to assert
RESET (S2 labeled MASTER RESET) after each gain change in order for the device to recognize the new
gain configuration. The truth table is shown below and also it is marked on the EVM board. However, the
gain settings are WRONG on the EVM silkscreen. Refer to
for the correct gain settings.
Table 3. TAS5704 Gain Configuration
Jumper GAIN1
Jumper GAIN0
GAIN (dB)
Shunt IN = 0
Shunt OUT = 1
0
0
–3
0
1
3
1
0
9
1
1
12
FM0, FM1, and FM2 are used to change the data format by which TAS5704 operates. FMT0 and FMT1
jumpers associated with DIR9001 in SPDIF interface enables the user to change the data format of
DIR9001 so that the data format is in sync with TAS5704 data format. Both TAS5704 and DIR9001 are
set by default to operate at 24-bit I2S format. It is important to assert RESET after each format change in
order for the device to recognize the format change. The truth tables below indicate the jumper
configuration and the data format of TAS5704 and DIR9001 (SPDIF).
Table 4. TAS5704 Data Format
FM2
(1)
FM1
(1)
FM0
(1)
DATA FORMAT
0
0
0
16BIT RJ
0
0
1
18BIT RJ
0
1
0
20BIT RJ
0
1
1
24BIT RJ
1
0
0
16 - 24BIT I2S (Default)
1
0
1
16 – 24bit RJ
1
1
0
RESERVED
1
1
1
TEST MODE
(1)
SHUNT IN = 0, SHUNT OUT = 1 (see schematics for details)
Table 5. DIR9001 SPDIF Output Data Format
FMT1
(1)
FMT0
(1)
DATA FORMAT
0
0
16BIT
0
1
24BIT RJ
1
0
24BIT LJ
1
1
24BIT I2S (Default)
(1)
SHUNT IN = 0, SHUNT OUT = 1 (See schematic for details)
CFG1 and CFG2 jumpers are used to select the output configuration between single-ended outputs and
bridge-tied outputs or a combination of the two options. See
for summary of possible settings.
TA5704EVM 4-Channel Digital Audio Power Amplifier with Hardware Control
12
SLOU224 – April 2008