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TDA1305

Stereo 1fs data input up-sampling filter with bitstream continuous dual DAC (BCC-DAC2)

Philips Electronics 

Philips Semiconductors

Stereo 1fs data input up-sampling filter with

bitstream continuous dual DAC (BCC-DAC2)

Preliminary specification

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

TDA1305T

NAME

SO28

PACKAGE

DESCRIPTION

plastic small outline package; 28 leads; body width 7.5 mm

VERSION

SOT136-1

1995 Dec 08

2

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