Philips UDA1334BT, Datasheet, Page: 9 / 24

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 D
IGITAL INTERFACE 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 M
UTE 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 D
E
-
EMPHASIS CONTROL
De-emphasis can be switched on for f
s
= 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 P
OWER CONTROL 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
oversampling ratio of the noise shaper will be 128f
s
instead
of 64f
s
.
SFOR1 SFOR0 INPUT FORMAT
LOW LOW I
2
S-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