TDA7501_07 Datasheet, PDF (9/29 Pages) STMicroelectronics – Line driver for digital car radio Signal processor (DSPLD)

TDA7501
3
Description of the input part
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
rms referred to 4.15V (=V33 ·1.2575). The following CODEC interface attenuates the 2V_RMS
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.
CASSL
CASSR
CDL+
CD-
CDR+
FULL
DIFFERENTIAL
STEREO
PHONE+
PHONE-
NAVI+
NAVI-
AM-LEVEL
FM-LEVEL
FM
TUNER-
AM
AM-IF
CDL
QDIFF-
STEREO
CDR
DIFF-MONO
DIFF-MONO
(QDiff-Stereo)
LEVEL-SHIFT
PHONE/NAVI
MIX
LEVEL-SHIFT
FM
FM/AM-DIFF
DUAL-MPX
AM
ENVELOPE DETECTOR
AM-SPIKES
PHONE/NAVI-MIX
CDL
PHONE/FDL
NAVI/FDR
PHONE/NAVI-MIX
CASSL
MPX-RDS
AM
AM-LEVEL
INSELECT 1L
MUTE
CDL
CDR
INGAIN BYP
0..15dB
1dB STEP
BYPASS (2Vrms)
TO OUTPUT PART
INGAIN 1L
0..15dB
1dB STEP
CODEC-IF
2Vrms
VIN: 4.15Vdc
2Vrms
VOUT: 1.65Vdc
0.8Vrms
0.8Vrms
OUT1L
CDR
PHONE/FDL
NAVI/FDR
PHONE/NAVI-MIX
CASSR
MPX-RDS
FM/DUAL-MPX
AM-SPIKES
INSELECT 1R
MUTE
INGAIN 1R
0..15dB
1dB STEP
CODEC-IF
2Vrms
VIN: 4.15Vdc
2Vrms
VOUT: 1.65Vdc
0.8Vrms
0.8Vrms
OUT1R
CDL
PHONE/FDL
NAVI/FDR
PHONE/NAVI-MIX
CASSL
AM
FM-LEVEL
AM-LEVEL
INSELECT 2L
MUTE
INGAIN 2L
0..15dB
1dB STEP
CODEC-IF
2Vrms
VIN: 4.15Vdc
2Vrms
VOUT: 1.65Vdc
0.8Vrms
0.8Vrms
OUT2L
MPX-RDS
CDR
PHONE/FDL
NAVI/FDR
PHONE/NAVI-MIX
CASSR
MPX-RDS
FM/DUAL-MPX
AM-SPIKES
INSELECT 2R
MUTE
INGAIN 2R
0..15dB
1dB STEP
CODEC-IF
2Vrms
VIN: 4.15Vdc
2Vrms
VOUT: 1.65Vdc
0.8Vrms
0.8Vrms
OUT2R
D00AU1201
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