SAA7706H/N210S,557 NXP Semiconductors, SAA7706H/N210S,557 Datasheet - Page 27

• Manufacturer Part Number: SAA7706H/N210S,557
• Description: IC DSP CAR RADIO 80QFP
• Manufacturer: NXP Semiconductors
• Type: Car Signal Processorr

Specifications of SAA7706H/N210S,557

• Interface: I²C, I²S, LSB, SPDIF
• Voltage - I/o: 3.30V
• Voltage - Core: 3.30V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 80-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Clock Rate: -
• Non-volatile Memory: -
• On-chip Ram: -

Philips Semiconductors
8.15
The RDS demodulator recovers the additional inaudible
RDS information which is transmitted by FM radio
broadcasting. The (buffered) data is provided as output for
further processing by a suitable decoder. The operational
functions of the decoder are in accordance with the EBU
specification ”EN 50067” .
The RDS demodulator has three different functions:
2001 Mar 05
handbook, full pagewidth
Clock and data recovery from the MPX signal
Buffering of 16 bits, if selected
Interfacing with the microcontroller.
Car radio Digital Signal Processor (DSP)
RDS demodulator (pins RDS_CLOCK
and RDS_DATA)
(dB)
100
20
40
60
80
0
0
19
Fig.16 Overall frequency response curve decimation filters.
38
57
27
76
8.15.1
The RDS-chain has a separate input. This enables RDS
updates during tape play and also the use of a second
receiver for monitoring the RDS information of signals from
an other transmitter (double tuner concept). It can as such
be done without interruption of the audio program. The
MPX signal from the main tuner of the car radio can be
connected to this RDS input via the built-in source
selector. The input selection is controlled by an I
The RDS chain contains a sigma-delta ADC (ADC3),
followed by two decimation filters. The first filter passes the
multiplex band including the signals around 57 kHz and
reduces the sigma-delta noise. The second filter reduces
the RDS bandwidth around 57 kHz. The overall filter curve
is shown in Fig.16 and a more detailed curve of the RDS
57 kHz band in Fig.17.
C
95
LOCK AND DATA RECOVERY
114
133
Product specification
SAA7706H
f (kHz)
MGT471
152
2
C-bus bit.