TDA7407D datasheet(12/34 Pages) STMICROELECTRONICS

12 / 34 page

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TDA7407D

12/34

MULTIPATH DETECTOR

■ Internal 19kHz band pass filter

■ Programmable band pass and rectifier gain

■ two pin solution fully independent usable for external programming

■ selectable internal influence on Stereoblend

Table 10. Quality Detector

6.1

DESCRIPTION OF THE AUDIOPROCESSORPART

6.1.1 Input Multiplexer

■ CD quasi differential

■ Cassette stereo

■ Phone inverting

■ AM mono

■ Stereodecoder input.

6.1.2 Input stages

Most of the input stages have remained the same as in preceeding ST audioprocessors with exception of

the CD inputs (see figure 8).In the meantime there are some CD players in the market having a significant

high source impedance which affects strongly the common-mode rejection of the normal differential input

stage. The additional buffer of the CD input avoids this drawback and offers the full common-mode rejec-

Table 9. ELECTRICAL CHARACTERISTICS (continued)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

fCMP

Center Frequency of Multipath-

Bandpass

stereodecoder locked on

Pilottono

KHz

GBPMP

Bandpass Gain

bits D2, D1 configuration byte = 00

6dB

bits D2, D1 configuration byte = 10

bits D2, D1 configuration byte = 01

bits D2, D1 configuration byte = 11

GRECTMP Rectifier Gain

bits D7, D6 configuration byte = 00

7.6

bits D7, D6 configuration byte = 01

4.6

bits D7, D6 configuration byte = 10

0dB

bits D7, D6 configuration byte = 11

off

ICHMP

Rectifier Charge Current

bit D5 configuration byte = 0

0.5

µA

bit D5 configuration byte = 1

1.0

µA

IDISMP

Rectifier Discharge Current

0.5

1.5

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Multipath Influence Factor

Addr. 12 / Bit 5+6

0.7

0.85

1.00

1.15

Noise Influence Factor

Addr. 16 / Bit 1+2

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