STV82X6 datasheet(43/95 Pages) STMICROELECTRONICS

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STV82x6

AGCS

AGC Control and Status for IF ADC

Note:

When AGC_CMD = 0, AGC_ERR[4:0] can be read -- indicating the input level. It can also be written

to -- presetting the AGC level which will then adjust itself to the final value.

When AGC_CMD = 1, the AGC is off and writing to AGC_ERR[4:0] directly controls the AGC

amplifier gain. Reading AGC_ERR just confirms the fixed value.

DCS

DC Offset Status for IF ADC

Address (hex): 0Fh

Type: R

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.

AGC_ERR[4:0]

00000

Amplifier Gain Control

This is the Gain Control value of ADC. There are 31 steps of +1.25 dB (see Note below).

00000: 0 dB Gain

11110: +37.5 dB Gain

SIG_OVER

AGC Input SIgnal Upper Threshold

0: Normal signal

1: Signal too large and AGC is overloaded

SIG_UNDER

AGC Input SIgnal Lower Threshold

0: Normal signal

1: Signal too small and AGC is underloaded

When the AGC is in Automatic mode (AGC_CMD = 0), bits SIG_OVER and SIG_UNDER indicate

if the input signal is too small/large and the AGC is under/overloaded. This is useful when setting

the STV82x6 SIF input level.

Address (hex): 10h

Type: R

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

DC_ERR[7:0]

Bit Name

Reset

Function

DC_ERR[7:0]

00000000

DC offset error of IF ADC output

STV82X6 数据表(PDF) 43 Page - STMicroelectronics

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