STV8236 datasheet(44/97 Pages) STMICROELECTRONICS

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STV82x6

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Note:

These registers allow direct access to the demodulator signal detectors.

AGCC

AGC Control for IF ADC

FM1_CAR

Channel 1 FM/AM Carrier detector flag

0: Not detected

1: Detected

FM1_SQ

Channel 1 FM Squelch detector flag

0: Not detected

1: Detected

Address (hex): 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 AUTOSTD 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 1.25 dB by the ADC.

Step Duration (ms)

1.33

2.66

5.33

10.66

Bit Name

Reset

Function

STV8236 Datasheet(PDF) 44 Page - STMicroelectronics

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