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TDA9855

I2C-bus controlled BTSC stereo/SAP decoder and audio processor

Philips Electronics 

Philips Semiconductors

I2C-bus controlled BTSC stereo/SAP

decoder and audio processor

Product specification

TDA9855

Requirements for the composite input signal to ensure correct system performance

SYMBOL

PARAMETER

COMPL+R(rms)

∆COMP

composite input level for 100%

modulation L + R;

25 kHz deviation;

fi = 300 Hz; RMS value

composite input level

spreading under operating

conditions

Zo

flf

fhf

THDL,R

output impedance

low frequency roll-off

high frequency roll-off

total harmonic distortion L + R

S/N

signal-to-noise ratio

L + R/noise

αSB

side band suppression mono

into unmodulated SAP carrier;

SAP carrier/side band

αSP

spectral spurious attenuation

L + R/spurious

CONDITIONS

measured at pin COMP

MIN.

162

Tamb = −20 to +70 °C; aging; −0.5

power supply influence

note 1

−

25 kHz deviation L + R; −2 dB −

25 kHz deviation L + R; −2 dB 100

fi = 1 kHz; 25 kHz deviation −

fi = 1 kHz; 125 kHz deviation; −

note 2

CCIR 468-2 weighted quasi

peak; L + R; 25 kHz deviation;

fi = 1 kHz; 75 µs de-emphasis

critical picture modulation 44

with sync only

54

mono signal: 25 kHz deviation, 46

fi = 1 kHz; side band: SAP

carrier frequency ±1 kHz

50 Hz to 100 kHz;

40

mainly n × fH; no de-emphasis;

L + R; 25 kHz deviation,

f = 1 kHz as reference

TYP.

250

MAX.

363

−

+0.5

low-ohmic 5

−

5

−

−

−

0.5

−

1.5

−

−

−

−

−

−

−

−

UNIT

mV

dB

kΩ

Hz

kHz

%

%

dB

dB

dB

dB

Notes

1. Low-ohmic preferred, otherwise the signal loss and spreading at COMP, caused by Zo and the composite input

impedance (see Chapter “Characteristics”, Section INPUT LEVEL ADJUSTMENT CONTROL) must be taken into

account.

2. In order to prevent clipping at over-modulation (maximum deviation in the BTSC system for 100% modulation is

73 kHz).

1997 Nov 04

12

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