saa7706h NXP Semiconductors, saa7706h Datasheet - Page 18

• Manufacturer Part Number: saa7706h
• Description: Car Radio Digital Signal Processor Dsp
• Manufacturer: NXP Semiconductors

Philips Semiconductors
8.4
The FM_MPX signal is after selection available at one of
three ADCs (ADC1, 2 and 3). The multiplex FM signal is
converted to the digital domain in ADC1, 2 and 3 through
a bitstream ADC. Improved performance for FM stereo
can be achieved by means of adapting the noise shaper
curve of the ADC to a higher bandwidth.
The first decimation takes place in two down-sample
filters. These decimation filters are switched by means of
the I
position. In the event of FM reception it must be in the
narrow position.
2001 Mar 05
handbook, full pagewidth
Car radio Digital Signal Processor (DSP)
2
C-bus bit wide_narrow in the wide or narrow band
(dB)
Signal path from FM_MPX input to IAC and
stereo decoder
100
120
140
20
40
60
80
0
0
Fig.10 Overall frequency response of ADC1, ADC2 and decimation filters.
100
200
18
After selection of one of the ADCs, the FM_MPX path it is
followed by the IAC and the FM stereo decoder. One of the
two MPX filter outputs contains the multiplex signal with a
frequency range of 0 to 60 kHz. The overall low-pass
frequency response of the decimation filters is shown in
Fig.10.
300
400
f (kHz)
Product specification
SAA7706H
MGT466
500