September 1991

Philips Semiconductors

Product specification

Dual top-performance bitstream DAC

TDA1547

FEATURES

Top-grade audio performance

very low harmonic distortion

high signal-to-noise ratio

wide dynamic range of approximately 108 dB

(not A-weighted)

High crosstalk immunity

Bitstream concept

high over-sampling rate up to 192 f

pulse-density modulation

inherently monotonic

no zero-crossing distortion

GENERAL DESCRIPTION

The TDA1547 is a dedicated one-bit digital-to-analog
converter to facilitate a high fidelity sound reproduction of
digital audio. The TDA1547 is extremely suitable for use in
high quality audio systems such as Compact Disc and
DAT players, or in digital amplifiers and digital signal
processing systems. The TDA1547 is used in combination
with the SAA7350 bitstream circuit, which includes the

third-order noise shaper. The excellent performance of the
SAA7350 and TDA1547 bitstream conversion system is
obtained by separating the noise shaping circuit and the
one-bit conversion circuit over two IC's, thereby reducing
the crosstalk between the digital and analog parts. The
TDA1547 one-bit converter is processed in BIMOS. In the
digital logic and drivers bipolar transistors are used to
optimize speed and to reduce digital noise generation. In
the analog part the bipolar transistors are used to obtain
high performance of the operational amplifiers. Special
layout precautions have been taken to achieve a high
crosstalk immunity. The layout of the TDA1547 has fully
separated left and right channels and supply voltage lines
between the digital and analog sections.

ORDERING INFORMATION

Note

1. SOT-232-1; 1996 August 23.

EXTENDED TYPE

NUMBER

PACKAGE

PINS

PIN POSITION

MATERIAL

CODE

TDA1547

(1)

SDIL

plastic

SOT232A

September 1991

Philips Semiconductors

Product specification

Dual top-performance bitstream DAC

TDA1547

Fig.1 Pinning diagram.

handbook, halfpage

MCD294

DGND

VDDD

IN R

n.c.

CLK R

VDDD R

VSSD R

Vref R

VSSA

DAC R

+ DAC R

AGND R

+ OUT R

OUT R

TDA1547

VSSD

IN L

n.c.

CLK L

VDDD L

VSSD L

Vref L

VDDA

DAC L

+ DAC L

AGND L

+ OUT L

OUT L

VSUB

AGND DAC R

AGND DAC L

September 1991

Philips Semiconductors

Product specification

Dual top-performance bitstream DAC

TDA1547

PINNING

SYMBOL

PIN

DESCRIPTION

DGND

0 V digital supply

DDD

5 V digital supply for both channels

IN R

serial one-bit data input for the right channel

n.c.

pin not connected; should preferably be connected to digital ground

CLK R

clock input for the right channel

DDD R

5 V digital supply for the right channel; this voltage determines the internal logic HIGH level
in the right channel

SSD R

3.5 V digital supply for the right channel; this voltage determines the internal logic LOW

level in the right channel

ref R

4 V reference voltage for the right channel switched capacitor DAC

AGND DAC R

0 V reference voltage for the right channel switched capacitor DAC; this pin should be
connected to analog ground

DAC R

output from the right negative switched capacitor DAC; feedback connection for the right
negative operational amplifier

+DAC R

output from the right positive switched capacitor DAC; feedback connection for the right
positive operational amplifier

AGND R

0 V reference voltage for both right channel operational amplifiers

n.c.

pin not connected; should preferably be connected to analog ground

+OUT R

+ output of the switched capacitor operational amplifier

OUT R

output of the switched capacitor operational amplifier

SSA

5 V analog supply

DDA

5 V analog supply

OUT L

output of the switched capacitor operational amplifier

+OUT L

+ output of the switched capacitor operational amplifier

n.c.

pin not connected; should preferably be connected to analog ground

AGND L

0 V reference voltage for both left channel operational amplifiers

+DAC L

output from the left positive switched capacitor DAC; feedback connection for the left
positive operational amplifier

DAC L

output from the left negative switched capacitor DAC; feedback connection for left negative
operational amplifier

AGND DAC L

0 V reference voltage for the left channel switched capacitor DAC; this pin should be
connected to analog ground

ref L

4 V reference voltage for the left channel switched capacitor DAC

SSD L

3.5 V digital supply for the left channel; this voltage determines the internal logic LOW level

in the left channel

DDD L

5 V digital supply for the left channel; this voltage determines the internal logic HIGH level in
the left channel

September 1991

Philips Semiconductors

Product specification

Dual top-performance bitstream DAC

TDA1547

QUICK REFERENCE DATA

CLK L

clock input for the left channel

n.c.

pin not connected; should preferably be connected to digital ground

IN L

serial one-bit data input for the left channel

SSD

5 V digital supply for both channels

SUB

5 V substrate voltage

SYMBOL

PARAMETER

CONDITION

MIN

TYP

MAX

UNIT

Supply voltages

DDD L. R

positive digital supply voltage for one
channel; pins 27 and 6

4.5

5.0

5.5

DDD

digital supply voltage for both channels;
pin 2

4.5

5.0

5.5

SSD L. R

negative digital supply voltage for one
channel; pins 26 and 7

4.0

3.5

3.0

SSD

negative digital supply voltage for both
channels; pin 31

5.5

5.0

4.5

DDA

positive analog supply voltage; pin 17

4.5

5.0

SSA

negative analog supply voltage; pin 16

6.0

5.0

4.5

Supply current

DDD L. R

positive digital supply current for one
channel; pins 27 and 6

0.1

DDD

digital supply current for both channels;
pin 2

29.0

SSD L. R

negative digital supply current for one
channel; pins 26 and 7

0.1

SSD

negative supply current for both channels;
pin 31

28.0

DDA

positive analog supply current; pin 17

51.0

SSA

negative analog supply current; pin 16

51.0

tot

total power dissipation

800

OUT(RMS)

output voltage (RMS value)

CLK

= 8.46 MHz;

notes 1 and 2

0.85

1.0

1.15

SYMBOL

PIN

DESCRIPTION

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