2002 May 22 9
Philips Semiconductors Product specification
Low power audio DAC UDA1334BT
8.6 Feature settings
The features of the UDA1334BT can be set by control
pins SFOR1, SFOR0, MUTE, DEEM and PCS.
8.6.1 DIGITALINTERFACE FORMAT SELECT
The digital audio interface formats (see Fig.5) can be
selected via the pins SFOR1 and SFOR0 as shown in
Table 4.
Table 4 Data format selection
8.6.2 MUTE CONTROL
The output signal can be soft muted by setting pin MUTE
to HIGH level as shown in Table 5.
Table 5 Mute control
8.6.3 DE-EMPHASIS CONTROL
De-emphasis can be switched on for fs= 44.1 kHz by
setting pin DEEM at HIGH level. The function description
of pin DEEM is given in Table 6.
Table 6 De-emphasis control
Remark: the de-emphasis function in only supported in
the normal operating mode, not in the low sampling
frequency mode.
8.6.4 POWERCONTROL AND SAMPLING FREQUENCY
SELECT
Pin PCS is a 3-level pin and is used to set the mode of the
UDA1334BT. The definition is given in Table 7.
Table 7 PCS function definition
The low sampling frequency mode is required to have a
higher oversampling rate in the noise shaper in order to
improve the signal-to-noise ratio. In this mode the
oversamplingratio of the noise shaper will be 128fsinstead
of 64fs.
SFOR1 SFOR0 INPUT FORMAT
LOW LOW I2S-bus input
LOW HIGH LSB-justified 16 bits input
HIGH LOW LSB-justified 20 bits input
HIGH HIGH LSB-justified 24 bits input
MUTE FUNCTION
LOW mute off
HIGH mute on
DEEM FUNCTION
LOW de-emphasis off
HIGH de-emphasis on
PCS FUNCTION
LOW normal operating mode
MID low sampling frequency mode
HIGH Power-down or Sleep mode