SAF7741 データシートの表示（PDF） - NXP Semiconductors.

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SAF7741

Car radio Digital Signal Processor (DSP)

NXP Semiconductors. 

NXP Semiconductors

SAF7741HV

Dual IF car radio and audio DSP (N1F)

AGC commands define the gain compensation required to compensate for the gain

change of the tuner, and can also reset detectors in the stepped and the linear AGC.

The LD interface commands and their bit allocation are listed in Table 5. Refer to the tuner

data sheet for the different signal bands.

Table 5.

Bit

B22

B21

B20

B19

B18

B17

B16

B15

B14

B13

B12

B11

LD interface command bit allocation

Function

Bit

Reserved

B10

Reserved

B09

Reserved

B08

Reserved

B07

Reserved

B06

AGC_A[3]

B05

AGC_A[2]

B04

AGC_A[1]

B03

AGC_A[0]

B02

AGC_B[2]

B01

AGC_B[1]

B00

AGC_B[0]

−

Function

AGC_C[1]

AGC_C[0]

AGC_D[1]

AGC_D[0]

AGC_DM

RST_DET_D

RST_LIN

INJ

INJM

BW

BWM

−

The LD interface requests from the SAF7741HV and their bit allocations are listed in

Table 6.

Table 6.

Bit

B06

B05

B04

B03

B02

B01

B00

LD interface request bit allocation

Function

Reserved

Reserved

Reserved

DET_D[1]

DET_D[0]

INJ

BW

In TEF6730 mode, the DL Interface is replaced by 2 IF-AGC bits.

7.1.3 Digital radio interface

For digital radio an I2S output is provided for the I and Q signals (see Figure 14). A GPIO

pin can be used as a blend input that makes it possible to switch from conventional FM

and AM processing to digital radio processing.

There are two possible ways to get digital radio data:

• Digital radio interface 1 output, from either PDC1 or PDC2

• Digital radio interface 2 output via the T1E I2S interface from PDC2

SAF7741_5

Objective data sheet

Rev. 05 — 09 May 2008

© NXP B.V. 2008. All rights reserved.

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