AS3911B datasheet(21/155 Pages) AMSCO

21 / 155 page

ams Datasheet: 2014-Jun-12 [v1-08]

AS3911B – 21

Appl icatio n I n f o rm a t i o n

Gain in the second and third stage is 23 dB and can be reduced

in six 3 dB steps. Gain of these two stages is included in AGC

and Squelch loops or can be manually set in Receiver

Configuration Register 4. Sending of direct command Reset Rx

Gain is necessary to initialize the AGC, Squelch and RSSI block.

Sending this command clears the current Squelch setting and

loads the manual gain reduction from Receiver Configuration

characteristic, the pass band is adjusted according to

sub-carrier frequency using the bits lp2 to lp0 of the Receiver

Configuration Register 1. SeeFigure 13 for -1dB cut-off

frequency for different settings.

Figure 13:

Low Pass Control

Figure 14:

First and Third Stage Zero Setting

rec1<5> lp2

rec1<4> lp1

rec1<3> lp0

-1 dB point

1200 kHz

001

600 kHz

010

300 kHz

100

2 MHz

101

7 MHz

Other

Not used

rec1<2> h200

rec1<1> h80

rec1<0> z12k

First Stage

Zero

Third Stage

Zero

60 kHz

400 kHz

60 kHz

200 kHz

010

40 kHz

80 kHz

12 kHz

200 kHz

011

12 kHz

80 kHz

12 kHz

200 kHz

Other

Not used

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