STA400A datasheet(91/117 Pages) STMICROELECTRONICS

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STA400A

2.6 IF Sampling and Control Interface

AGC_CTRL1

- AGC Control Register #1

This register controls Terrestrial and satellite AGC loop gain and the sense of the TAGC and SAGC control pins.

b7:

TAGCCHS

Terrestrial AGC Loop Change Sign

b6-b4:

TAGCBETA(2:0)

Terrestrial AGC Loop Gain.

b3:

SAGCCHS

Satellite AGC Loop Change Sign

b2-b0:

SAGCBETA(2:0)

Satellite AGC Loop Gain.

SAGCREF

- Satellite AGC Reference Level

This register is 13 bits long and is divided into two bytes. The LSB byte is named SAGCREF0, the MSB byte is

named SAGCREF1. It sets the signal level at the Satellite ADC input.

SAGCINTG

- Satellite AGC Integrator

This register is connected to the 8MSB of the internal integrator of the satellite AGC loop. It gives an image of

the power level at the satellite analog input. The register format is two’s complement.

Type:

SingleByte - R/W

Word Length:

Byte Name

Address (Hex)

Bit Map

Reset Value (Hex)

AGC_CTRL1

0400

7-0

TAGCBETA and SAGCBETA Gain Table:

TAGCBETA/

SAGCBETA

Loop Gain

000

2**0 = 1

001

2**1 = 2

010

2**2 = 3

011

2**3 = 4

100

2**4 = 16

101

2**5 = 32

110

2**6 = 64

111

Open Loop

Type:

MultiBytes - R/W

Word Length:

Byte Name

Address (Hex)

Bit Map

Reset Value (Hex)

SAGCREF1

0402

12-8

SAGCREF0

0401

7-0

Type:

SingleByte - R/W

Word Length:

Byte Name

Address (Hex)

Bit Map

Reset Value (Hex)

SAGCINTG

0403

7-0

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