SAF7741 Просмотр технического описания (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)

a: After Stepped AGC

a: After Linear AGC

Fig 9. Linear AGC signal levels

The linear control reference level should be above the maximum uncontrolled input level

of the linear control stage (See Figure 7). Settings of the reference level below the

maximum uncontrolled input level will result in a distorted output signal.

7.1.2.12 IF signal level detection

Signal level detection for wideband AGC is handled in the tuner. The resulting AGC steps

are then interfaced to SAF7741HV and a step compensation is made. The IF AGC is

controlled by level detectors within the PDC, and by IF detector high- and low-level

settings which can be set via IC. The level detectors in the PDC communicate with the

tuner to increase or decrease the level of the incoming signal.

The IF detector bandwidth is shown in Figure 10.

AGC DETCTION BANDWIDTH

dB

500

1000

1500

2000

2500 KHz

-20

-40

-60

-80

-100

-120

Fig 10. IF detector bandwidth

7.1.2.13 AGC output decimation

The output signal of the AGC is decimated by two to 650 kSa/s before it enters the IQC

stage.

SAF7741_5

Objective data sheet

Rev. 05 — 09 May 2008

© NXP B.V. 2008. All rights reserved.

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