TDA7500A STMicroelectronics, TDA7500A Datasheet - Page 36

• Manufacturer Part Number: TDA7500A
• Description: IC PROCESSOR AM/FM DGTL 100-TQFP
• Manufacturer: STMicroelectronics
• Type: Audio Processorr

Specifications of TDA7500A

• Applications: Audio Systems
• Mounting Type: Surface Mount
• Package / Case: 100-TQFP Exposed Pad, 100-eTQFP, 100-HTQFP, 100-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TDA7500A
Figure 20. lock Diagram of Car Amplifier Audio Sub-System.
Clock Scheme
When TDA7500A is used in AD/FM mode the following scheme is choosen in order to avoid harmonics inside
the FM band. Parts of the system are directly clocked by the crystal oscillator, whereas other parts are driven
by the pll oscillator. Thanks to this it is possible to process any audio source as well analog as digital in parallel
to record FM mono for traffic informations, telephone resp. navigation and RDS. Figure 21 shows the clock
scheme. Regarding on the country and its FM bandwidth different crystals should be selected.
Figure 21. Clock Scheme
36/40
8.55 MHz
8.89 MHz
Fext: 44.1 kHz, 48kHz
OSC
Xtal
A/D mono
level / tel. / navi.
A/D FM-rds /
noise det.
A/D FM-mpx/
stereo audio
Int./Ext.
Fcomp:
Stereo DSP
PLL
1.425 MHz (8.55/6)
1.411 MHz (44.1*2*16)
1.536 MHz (48*2*16)
Faudio:
D/A Coverters
RDS-Demod.
FRONT END
TDA7421
Audio DSP
MICRO
MAIN
48.51 kHz
44.1 kHz
48
EEPROM/
FLASH
kHz
I
2
C/SPI
DIGITAL IN
Fvco:
173.85 MHz (Fcomp*122)
158.05 MHz (Fcomp*112)
172.03 MHz (Fcomp*112)
A/D
Fdsp:
43.46 MHz (Fvco/4)
39.51 MHz (Fvco/4)
43.01 MHz (Fvco/4)
Frds:
8.55 MHz (Fxtal)
Fconverter:
12.42 MHz (Fvco/14)
11.29 MHz (Fvco/14)
12.29 MHz (Fvco/14)
ANALOG INPUT
TDA7500A
TDA7501
SPDIF
DRAM/
SRAM
D/A
DISPLAY
MICRO
2nd
Hamonics
3rd
Hamonics
AUDIO POWER
Fig20TDA7500A
[MHz]
FM Japan
DIGITAL OUT
76..90
90.38
135.57
87.5..108 65..74
West Europe East
130.38
86.92
130.38
135.57
90.38
86.92