TDA7405_04 STMICROELECTRONICS [STMicroelectronics], TDA7405_04 Datasheet - Page 36

• Manufacturer Part Number: TDA7405_04
• Description: EQUALIZER CARRADIO SIGNAL PROCESSOR
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

TDA7405
Figure 36. Blockdiagram of the Multipath-Detector
11.5 Quality Detector
The TDA7405 offers a quality detector output which gives a voltage representing the FM-reception conditions.
To calculate this voltage the MPX-noise and the multipath-detector output are summed according to the follow-
ing formula :
V
= 1.6 (V
-0.8 V)+ a (REF5V-V
).
Qual
Noise
Mpout
The noise-signal is the PEAK-signal without additional influences (see noiseblanker description). The factor 'a'
can by programmed to 0.7 .... 1.15. The output is a low impedance output able to drive external circuitry as well
as simply fed to an AD-converter for RDS applications.
36/57