TDA7402 datasheet(25/59 Pages) STMICROELECTRONICS

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TDA7402

1.16 Audioprocessor Testing

During the Testmode, which can be activated by setting bit D0 of the stereodecoder testing-byte and the audio-

processor testing byte, several internal signals are available at the FD2R- pin. During this mode the input re-

sistance of 100kOhm is disconnected from the pin. The internal signals available are shown in the Data-byte

specification.

2.0 STEREODECODER PART

2.1 FEATURES:

no external components necessary

PLL with adjustment free, fully integrated VCO

automatic pilot dependent MONO/STEREO switching

very high suppression of intermodulation and interference

programmable Roll-Off compensation

dedicated RDS-Softmute

Highcut- and Stereoblend-characterisctics programmable in a wide range

FM/AMNoiseblanker with several threshold controls

Multipath-detector with programmable internal/external influence

2C-bus control of all necessary functions

2.2 ELECTRICAL CHARACTERISTICS

VS = 9V, deemphasis time constant = 50µs, MPX input voltage VMPX = 500mV (75kHz deviation), modulation

frequency = 1kHz, input gain = 6dB, Tamb =27°C, unless otherwise specified.

Symbol

Parameter

Test Conditio n

Min.

Typ.

Max.

Unit

Vin

MPX Input Level

Input Gain = 3.5dB

0.5

1.25

Vrms

Rin

Input Resistance

100

Ω

Gmin

Min. Input Gain

3.5

Gmax

Max. Input Gain

Gstep

Step Resolution

2.5

SVRR

Supply Voltage Ripple Rejection

Vripple = 100mV, f = 1kHz

Max. Channel Separation

THD

Total Harmonic Distortion

fin=1kHz, mono

0.02

0.3

Signal plus Noise to Noise Ratio

A-weighted, S = 2Vrms

MONO/STEREO-S WITCH

VPTHST1 Pilot Threshold Voltage

for Stereo, PTH = 1

VPTHST0 Pilot Threshold Voltage

for Stereo, PTH = 0

VPTHMO1 Pilot Threshold Voltage

for Mono, PTH = 1

S+ N

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