STV82X8 datasheet(59/157 Pages) STMICROELECTRONICS

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STV82x8

Note:

These registers allow direct access to the demodulator signal detectors.

AGC_CTRL

IF AGC Control Register

Bit Name

Reset

Function

Bits [7:2]

000

Reserved.

FM1_CAR

Channel 1 FM Carrier Detector Flag

0: Not detected

1: Detected

FM1_SQ

Channel 1 FM Squelch Detector Flag

0: Not detected

1: Detected

Address: 0Eh

Type: R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

IF_SELECT

AGC_REF[2:0]

AGC_CST[1:0]

Bit Name

Reset

Function

Bits[7:5]

Reserved.

IF_SELECT

Selection of the IF input.

0: IF input SIF 1

1: IF input SIF 2

AGC_REF[2:0]

100

This bitfield is used to defines the clipping level which adjusts the allowable proportion of samples

at the input of the ADC which will be clipped. The AGC tries to maximize the use of the full scale

range of the ADC. The default setting gives a ratio of 1/256.

Clipping Ratio

000:

1/16 (Single carrier)

100:

1/256 (Default)

001:

1/32

101:

1/512

010:

1/64

110:

1/1024

011:

1/128

111:

1/2048 (Multiple carriers)

AGC_CST[1:0]

AGC Time Constant

This is the time constant between each step of 1.5 dB by the AGC.

Step Duration (ms)

1.33

2.66

5.33

10.66

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