MSP3410D datasheet(10/83 Pages) MICRONAS

10 / 83 page

MSP 34x0D

PRELIMINARY DATA SHEET

Micronas

4. Architecture of the MSP 34x0D

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,

nine D/A-converters, and SCART Switching Facili-

ties.

4.1. Demodulator and NICAM Decoder Section

4.1.1. Analog Sound IF – Input Section

The input pins ANA_IN1+, ANA_IN2+, and ANA_IN

−

offer the possibility to connect two different sound IF

(SIF) sources to the MSP 34x0D. By means of bit [8] of

AD_CV (see Table 6–5 on page 25), either terrestrial

or satellite sound IF signals can be selected. The ana-

log-to-digital conversion of the preselected sound IF

signal is done by an A/D converter whose output is

used to control an analog automatic gain circuit (AGC)

providing an optimal level for a wide range of input lev-

els. It is possible to switch between automatic gain

control and a fixed (setable) input gain. In the optimal

case, the input range of the A/D converter is com-

pletely covered by the sound IF source. Some combi-

nations of SAW filters and sound IF mixer ICs, how-

ever, 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 capac-

itors at pins ANA_IN1+ and ANA_IN2+ and the IF

impedance (as shown in the application diagram) are

sufficient in most cases.

Fig. 4–1: Architecture of the MSP 34x0D

Sound IF

ANA_IN1+

ANA_IN2+

Mono

MONO_IN

SC1_IN_L

SCART1

SC1_IN_R

SC2_IN_L

SCART2

SC2_IN_R

SC3_IN_L

SCART3

SC3_IN_R

SC4_IN_L

SC4_IN_R

SCART4

Demodulator

& NICAM

Decoder

SCART Switching Facilities

A/D

D/A

IDENT

SCARTL

SCARTR

NICAM B

NICAM A

FM2

I2S1/2L/R

FM1/AM

I2S_L/R

LOUD-

SPEAKER L

LOUD-

SPEAKER R

SCART1_L

SCART1_R

SCART2_L

SCART2_R

DSP

HEADPHONE R

HEADPHONE L

SUBWOOFER

I2S Interface

Crystal PLL

ADR-Bus

I2S_DA_IN1

I2S_DA_OUT

I2S_DA_IN2

I2S_WS

I2S_CL

XTAL_OUT

AUD_CL_OUT

XTAL_IN

D_CTR_OUT0/1

DACM_L

Loudspeaker

DACM_R

DACM_SUB

Subwoofer

Headphone

DACA_L

DACA_R

SC1_OUT_L

SC1_OUT_R

SC2_OUT_L

SC2_OUT_R

SCART 2

SCART 1

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