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TDA1305 데이터시트(Datasheet) 2 Page - NXP Semiconductors

부품명 TDA1305
상세내용  Stereo 1fs data input up-sampling filter with bitstream continuous dual DAC BCC-DAC2
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제조사  PHILIPS [NXP Semiconductors]
홈페이지  http://www.nxp.com
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 2 page
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1995 Dec 08
2
Philips Semiconductors
Preliminary specification
Stereo 1fs data input up-sampling filter with
bitstream continuous dual DAC (BCC-DAC2)
TDA1305T
FEATURES
• Easy application
• 16fs Finite-duration Impulse-Response (FIR)
filter incorporated
• Selectable system clock (fsys) 256fs or 384fs
• I2S-bus serial input format (at fsys = 256fs) or LSB fixed
16, 18 or 20 bits serial input mode (at fsys = 384fs)
• Slave-mode clock system
• Cascaded 4-stage digital filter incorporating 2-stage FIR
filter, linear interpolator and sample-and-hold
• Smoothed transitions before and after muting
(soft mute)
• Digital de-emphasis filter for three sampling rates of
32 kHz, 44.1 kHz and 48 kHz
• 12 dB attenuation via the attenuation input control
• Double speed mode
• 2nd order noise shaper
• 96 (fsys = 384fs) or 128 (fsys = 256fs) times oversampling
in normal speed mode
• 48 (fsys = 384fs) or 64 (fsys = 256fs) times oversampling
in double speed mode
• Bitstream continuous calibration concept
• Small outline SO28 package
• Voltage output 1.5 V (RMS) at line drive level
• Low total harmonic distortion
• No zero crossing distortion
• Inherently monotonic
• No analog post filtering required
• Superior signal-to-noise ratio
• Wide dynamic range (18-bit)
• Single rail supply (3.4 to 5.5 V).
GENERAL DESCRIPTION
The TDA1305T is a new generation of filter-DAC which
features a unique combination of bitstream and continuous
calibration techniques. The converter functions as a
bitstream converter for low signals while large signals are
generated using the dynamic continuous calibration
technique, thus resulting in low power consumption, small
chip size and easy application.
The TDA1305T is a dual CMOS DAC with up-sampling
filter and noise shaper. The combination of high
oversampling up to 16fs, 2nd order noise shaping and
continuous calibration conversion ensures that only simple
1st order analog post filtering is required.
The TDA1305T supports the I2S-bus data input mode with
word lengths of up to 20 bits (at fsys = 256fs) and the LSB
fixed serial data input format with word lengths of 16, 18
and 20 bits (at fsys = 384fs). Four cascaded FIR filters
increase the oversampling rate to 16 times. A
sample-and-hold function increases the oversampling rate
to 96 times (fsys = 384fs) or 128 times (fsys = 256fs). A
2nd order noise shaper converts this oversampled data to
a bitstream for the 5-bit DACs.
The DACs are of the continuous calibration type and
incorporate a special date coding. This ensures an
extremely high signal-to-noise ratio, superior dynamic
range and immunity to process variation and component
ageing.
Two on-board operational amplifiers convert the
digital-to-analog current to an output voltage. Externally
connected capacitors perform the required 1st order
filtering so that no further post filtering is required.
The unique combination of bitstream and continuous
calibration techniques, together with a high degree of
analog and digital integration, results in a single filter-DAC
with 18-bit dynamic range, high linearity and simple low
cost application.
ORDERING INFORMATION
TYPE NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TDA1305T
SO28
plastic small outline package; 28 leads; body width 7.5 mm
SOT136-1




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