TDA7410ND datasheet(14/34 Pages) STMICROELECTRONICS

14 / 34 page

Description of the audioprocessor part

TDA7410ND

14/34

5.7

Speaker Attenuator

Due to practical aspects the steps in the speaker attenuators are not linear over the full

range. At attenuations more than 24dB the steps increase from 2dB to 8dB (please see data

byte specification).

5.8

Stereodecoder part

●

No External components necessary

●

PLL with adjustment fully integrated VCO

●

Automatic pilot dependent MONO/STEREO switching

●

Very high suppression of intermodulation and interference

●

Highcut and Stereoblend characteristics programmable in a wide range

●

Internal noiseblanker with threshold controls

●

I2C bus control of all necessary functions

Table 6.

Stereodecoder electrical characteristics

VDD = 8.5V, Deemphasis time const = 50µs, VMPX = 500mV, In Gain = 6dB, 75kHz

deviation, f = 1kHz, Tamb =25°C, unless otherwise spificied

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

VIN

MPX input level

Input gain = 3.5dB

0.5

VRMS

Rin

Input resistance

100

Gain

Minimum input gain

3.5

Gmax

Maximum input gain

GSTEP

Step resolution

2.5

Max. channel separation

Mono/stereo switch

VPTHST1

Pilot threshold voltage

For stereo, PTH=1

VPTHST0

For stereo, PTH=0

VPTHMO1

For mono, PTH=1

VPTHMO0

For mono, PTH=0

PLL

Δf/f

Capture Range

0.5

Deemphass and highcut

τHC50

Deemphasis time constant

Stereodecoder-Byte

D5=0 VLEVEL >> VHCH

μs

τHC75

Stereodecoder-Byte

D5=1 VLEVEL >> VHCH

μs

τHC50

Highcut time constant

Stereodecoder-Byte

D5=0 VLEVEL >> VHCH

150

μs

τHC75

Stereodecoder-Byte

D5=1 VLEVEL >> VHCH

225

μs

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