September 1991

6

Philips Semiconductors

Product specification

Dual top-performance bitstream DAC

TDA1547

Notes to the quick reference data

2. Device measured in differential mode with external components as shown in Fig.5.

sinewave. Measured over a 20 Hz to 20 kHz bandwidth.

digital sinewave. Measured over a 20 Hz to 20 kHz bandwidth.

5. The specified signal-to-noise ratio includes noise introduced by the application components as shown in Fig.5.

FUNCTIONAL DESCRIPTION

Both channels are completely separated to reach the desired high crosstalk suppression level.

Each channel consists of the following functional parts:

THERMAL RESISTANCE

Supply current

(THD + N)/S

THD + Noise; 0 dB

1 kHz; notes 2 and 3

−−101

−96

dB

−

0.0009 0.0016 %

(THD + N)/S

THD + Noise; 0 dB

f = 20 Hz to 20 kHz;

−−101

-

dB

notes 2 and 4

−

0.0009 -

%

(THD + N)/S

THD + Noise;

−20 dB

f = 1 kHz;

notes 2 and 3

−−88

−84

dB

(THD + N)/S

THD + Noise;

−60 dB

f = 1 kHz;

notes 2 and 3

−−48

−44

dB

S/N

signal-to-noise ratio

pattern 0101..;

notes 2 and 5

109

111

−

dB

S/N

signal-to-noise ratio; “A”-weighting

pattern 0101..;

notes 2 and 5

−

113

−

dB

maximum clock frequency

−−

10

MHz

α

channel separation

f = 1 kHz

101

115

−

dB

operating ambient temperature

−20

−

70

°C

− One-bit input, which latches the incoming data to the system clock.

− Switch driver circuit, which generates the non-overlapping clock- and data-signals that control the DAC switched

capacitor networks.

− Switched capacitor network, this forms the actual DAC function, it supplies charge packets to the low-pass filter,

under control of the incoming one-bit code.

− Two high performance operational amplifiers, that perform the charge packet to voltage conversion and deliver a

differential output signal. The first pole of the low-pass filter is built around them.

SYMBOL

PARAMETER

MAX.

UNIT

from junction to ambient

60

K/W

SYMBOL

PARAMETER

CONDITION

MIN

TYP

MAX

UNIT