TDA7405 datasheet(23/56 Pages) STMICROELECTRONICS

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TDA7405

STEREODECODER-PART

3.1 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

Table 3. 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 Conditions

Min.

Typ.

Max.

Unit

Vin

MPX Input Level

Input Gain = 3.5dB

0.5

1.25

Vrms

Rin

Input Resistance

100

130

Ω

Gmin

Min. Input Gain

1.5

3.5

4.5

Gmax

Max. Input Gain

8.5

12.5

Gstep

Step Resolution

1.75

2.5

3.25

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-SWITCH

VPTHST1 Pilot Threshold Voltage

for Stereo, PTH = 1

VPTHST0 Pilot Threshold Voltage

for Stereo, PTH = 0

VPTHMO1 Pilot Threshold Voltage

for Mono, PTH = 1

VPTHMO0 Pilot Threshold Voltage

for Mono, PTH = 0

PLL

∆f/f

Capture Range

0.5

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