TDA7501

Description of the input part

9/29

3

Description of the input part

On the input side, the TDA7501 (see Figure 3) connects the external audio and tuner

signals to the four AD converters of the digital car radio signal processor TDA7500. The

audio signals are adjusted by the input gain stage to the internal reference signal with 2V

to 0.8Vrms referred to the CODEC's reference voltage of 1.65V which allows a DC coupling

to the TDA7500.

Figure 3.

Input part.

QDIFF-

STEREO

INGAIN BYP

INGAIN 1L

CODEC-IF

VIN:

4.15Vdc

2Vrms

VOUT: 1.65Vdc

0.8Vrms

PHONE/NAVI-MIX

DIFF-MONO

PHONE/NAVI

MIX

DIFF-MONO

CDL+

CDL

CDL

PHONE/FDL

NAVI/FDR

PHONE/NAVI-MIX

CASSL

MPX-RDS

AM

AM-LEVEL

CD-

CASSL

CDL

2Vrms

0.8Vrms

OUT1L

CDR

CASSR

MPX-RDS

CDR+

PHONE+

BYPASS (2Vrms)

TO OUTPUT PART

FULL

DIFFERENTIAL

STEREO

PHONE-

NAVI+

NAVI-

AM-LEVEL

FM-LEVEL

CDR

FM

AM

AM-SPIKES

(QDiff-Stereo)

LEVEL-SHIFT

LEVEL-SHIFT

ENVELOPE DETECTOR

TUNER-

FM/AM-DIFF

DUAL-MPX

AM-IF

FM

AM

INSELECT 1L

MUTE

0..15dB

1dB STEP

0..15dB

1dB STEP

INGAIN 1R

CODEC-IF

VIN:

4.15Vdc

2Vrms

VOUT: 1.65Vdc

0.8Vrms

CDR

PHONE/FDL

NAVI/FDR

PHONE/NAVI-MIX

CASSR

MPX-RDS

FM/DUAL-MPX

AM-SPIKES

2Vrms

0.8Vrms

OUT1R

INSELECT 1R

MUTE

0..15dB

1dB STEP

INGAIN 2L

CODEC-IF

VIN:

4.15Vdc

2Vrms

VOUT: 1.65Vdc

0.8Vrms

CDL

PHONE/FDL

NAVI/FDR

PHONE/NAVI-MIX

CASSL

AM

FM-LEVEL

AM-LEVEL

2Vrms

0.8Vrms

OUT2L

INSELECT 2L

MUTE

0..15dB

1dB STEP

INGAIN 2R

CODEC-IF

VIN:

4.15Vdc

2Vrms

VOUT: 1.65Vdc

0.8Vrms

CDR

PHONE/FDL

NAVI/FDR

PHONE/NAVI-MIX

CASSR

MPX-RDS

FM/DUAL-MPX

AM-SPIKES

2Vrms

0.8Vrms

OUT2R

INSELECT 2R

MUTE

0..15dB

1dB STEP

D00AU1201