STV8237 datasheet(68/156 Pages) STMICROELECTRONICS

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STV82x7

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AGC_CTRL

IF AGC Control Register

AGC_GAIN

IF AGC Control and Status Register

Address: 0Eh

Type: R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

AGC_CMD

AGC_REF[2:0]

AGC_CST[1:0]

Bit Name

Reset

Function

AGC_CMD

Automatic Gain Control Command Mode

Normally set to 0 enabling automatic mode. For L/L’ standards, the AGC should be switched off

due to the presence of the AM sound carrier. In this case, a fixed gain value should be set using

the AGCS register.

0: Automatic mode. AGC controlled by the Autostandard function. (Default)

1: Manual/Forced mode

Bits[6:5]

Reserved.

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

Address: 0Fh

Type: R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

AGC_ERR[4:0]

SIG_OVER

SIG_UNDER

Bit Name

Reset

Function

Bit 7

Reserved.

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