MSP3415D View Datasheet(PDF) - Micronas
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MSP3415D Datasheet PDF : 68 Pages
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MSP 34x5D
PRELIMINARY DATA SHEET
4. Architecture of the MSP 34x5D
Fig. 4–1 shows a simplified block diagram of the IC. Its
architecture is split into three main functional blocks:
1. demodulator and NICAM decoder section
2. digital signal processing (DSP) section performing
audio baseband processing
3. analog section containing two A/D-converters,
four D/A-converters, and SCART switching facilities.
4.1. Demodulator and NICAM Decoder Section
4.1.1. Analog Sound IF – Input Section
The input pins ANA_IN1+ and ANA_IN– offer the possi-
bility to connect sound IF (SIF) sources to the MSP
34x5D. The analog-to-digital conversion of the prese-
lected sound IF signal is done by an A/D-converter,
whose output can be used to control an analog automat-
ic gain circuit (AGC), providing an optimal level for a
wide range of input levels. It is possible to switch be-
tween automatic gain control and a fixed (setable) input
gain. In the optimal case, the input range of the A/D con-
verter is completely covered by the sound IF source.
Some combinations of SAW filters and sound IF mixer
ICs, however, show large picture components on their
outputs. In this case, filtering is recommended. It was
found, that the high pass filters formed by the coupling
capacitors at pin ANA_IN1+ (as shown in the application
diagram) are sufficient in most cases.
Sound IF
ANA_IN1+
Mono
MONO_IN
SC1_IN_L
SCART1
SC1_IN_R
SC2_IN_L
SCART2
SC2_IN_R
Demodulator
and NICAM
Decoder
I2S_DA_OUT
I2S_CL
I2S_DA_IN1
I2S_DA_IN2
I2S_WS
XTAL_IN XTAL_OUT
I2S Interface
Audio PLL
I2S1/2L/R I2S_L/R
2
FM1/AM
FM2
NICAM A
NICAM B
IDENT
LOUD-
SPEAKER L
LOUD-
SPEAKER R
D/A
D/A
A/D
A/D
DSP
SCART L
SCART R
SCART1_L
SCART1_R
D/A
D/A
D_CTR_OUT0/1
DACM_L
Loudspeaker
DACM_R
SC1_OUT_L
SCART
SC1_OUT_R
SCART Switching Facilities
Fig. 4–1: Architecture of the MSP 34x5D
10
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