TDA1388T Philips Semiconductors, TDA1388T Datasheet - Page 6

• Manufacturer Part Number: TDA1388T
• Description: Bitstream continuous calibration filter-DAC for CD-ROM audio applications
• Manufacturer: Philips Semiconductors

Philips Semiconductors
FUNCTIONAL DESCRIPTION
The TDA1388T CMOS DAC incorporates an up-sampling
digital filter, a sample-and-hold register, a noise shaper,
continuously calibrated current sources, line amplifiers
and headphone amplifiers. The 1f
to an oversampled rate of 64f
oversampling, together with the 5-bit DAC, enables the
filtering required for waveform smoothing and out-of-band
noise reduction to be achieved by simple 1st-order analog
post-filtering.
System clock
The TDA1388T accommodates slave mode only, this
means that in all applications the system devices must
provide the system clock. The system frequency is
selectable. The options are 256f
clock must be locked in frequency to the I
signals.
Table 1 System clock selection
Multiple format input interface
The TDA1388T supports the following data input formats;
Table 3 Selectable values of the digital sound processing features
1995 Dec 08
De-emphasis
Volume left channel
Volume right channel
Flat/min/max switch
Bass boost
Treble
Mute left channel
Mute right channel
Channel manipulation modes
16, 18 or 20 bits.
Bitstream continuous calibration filter-DAC
for CD-ROM audio applications
I
LSB justified serial format with data word length of
2
S-bus with data word length of up to 20 bits.
SYSSEL
0
1
FEATURES
s
. This high-rate
s
s
and 384f
input data is increased
DESCRIPTION
0 Hz or 44.1 kHz
0 dB (fixed)
0 dB (fixed)
flat (fixed)
flat set (fixed)
flat set (fixed)
external pin
external pin
L_CHANNEL = L (fixed)
R_CHANNEL = R (fixed)
256f
384f
2
s
S-bus input
. The system
s
s
STATIC-PIN MODE
6
Table 2 Data input formats
The input formats are illustrated in Fig.3. Left and right
data-channel words are time multiplexed.
Input mode
The TDA1388T has two input modes, a static-pin mode
and a microcontroller mode. In the static-pin mode, the
digital sound processing features such as mute left, mute
right and de-emphasis are controlled by external pins. The
other digital sound processing features have a default
value. In the microcontroller mode, all the digital sound
processing features can be controlled by the
microcontroller. The controllable features are;
The selection of one of the two modes is controlled by the
ACP pin. When this pin is at logic 0 then the static pin
mode will be selected. When the pin is at logic 1 then the
microcontroller mode will be selected.
De-emphasis.
Volume left channel.
Volume right channel.
Flat/min/max switch.
Bass boost.
Treble.
Channel manipulation modes.
IF1
0
0
1
1
0 Hz or 44.1 kHz
0 dB to
0 dB to
flat/min/max
flat, min or max set
flat, min or max set
selectable (see Table 4)
selectable (see Table 4)
see Table 10
IF2
0
1
0
1
MICROCONTROLLER MODE
I
LSB-justified, 16 bits
LSB-justified, 18 bits
LSB-justified, 20 bits
dB
dB
2
S-bus
Objective specification
FORMAT
TDA1388T