TDA1549T View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

TDA1549T

Stereo 4fs data input up-sampling filter with bitstream continuous calibration DAC (BCC-DAC1)

Philips Electronics 

Philips Semiconductors

Stereo 4fs data input up-sampling filter with

bitstream continuous calibration DAC (BCC-DAC1)

Objective specification

TDA1549T

FEATURES

• Easy application

• Finite-duration impulse-response (FIR) filtering and

noise shaping incorporated

• 2nd-order noise shaper

• Wide dynamic range (true 18-bit resolution)

• Low total harmonic distortion

• No zero-crossing distortion

• Superior signal-to-noise ratio

• Bitstream continuous calibration conversion concept

• Inherently monotonic

• Voltage output (1.5 V RMS) at line drive level

• Single supply rail (3.8 to 5.5 V)

• Optimum output voltage level over the entire supply

range

• Small outline packaging (SO16)

• Wide operating temperature range (−30 to +85 °C)

• Standard Japanese input format

• No analog post-filtering required

• Low power consumption

• Integrated operational amplifiers.

GENERAL DESCRIPTION

The TDA1549T (BCC-DAC1) is the first of a new

generation of digital-to-analog converters featuring a

unique combination of bitstream and continuous

calibration concepts.

A system of digital filtering, high oversampling, 2nd order

noise shaping and continuous calibration digital-to-analog

conversion ensures that only simple 1st order analog

filtering is required. The circuit accepts 18-bit four times

oversampled input data (4fs) in standard Japanese format.

Internal FIR filters remove the main spectral components

and increase the sampling rate to 96 times (96fs). A 2nd

order noise shaper converts this oversampled data to a

5-bit data stream. For low signal levels the converter

operates in the 1-bit bitstream mode with attendant high

differential linearity. Higher level signals are reproduced

using the dynamic continuous calibration technique,

thereby guaranteeing high linearity independent of

process variations, temperature effects and product

ageing.

High-precision, low-noise amplifiers convert the

digital-to-analog current to an output voltage capable of

driving a line output. Externally connected capacitors

perform the required 1st order filtering so that no further

post-filtering is required.

Internal reference circuitry ensures that the output voltage

is proportional to the supply voltage, thereby making

optimum use of the supply voltage over a wide range

(3.8 to 5.5 V). This unique configuration of bitstream and

continuous calibration techniques, together with a high

degree of analog and digital integration, results in a

digital-to-analog conversion system with true 18-bit

dynamic range, high linearity and simple low-cost

application.

ORDERING INFORMATION

TYPE NUMBER

TDA1549T

NAME

SO16

PACKAGE

DESCRIPTION

plastic small outline package; 16 leads; body width 7.5 mm

VERSION

SOT162−1

August 1994

2

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