STV82X7 datasheet(74/156 Pages) STMICROELECTRONICS

部品番号	STV82X7

部品情報	Digital Audio Decoder/Processor for A2 and NICAM Television/Video Recorders

PDF	156 Pages

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メーカー	STMICROELECTRONICS [STMicroelectronics]

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STV82x7

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IAGCC

Channel 2 Internal AGC Time Constant for QPSK

IAGCS

Channel 2 Internal AGC Status for QPSK

Address: 26h

Type: R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

IAGC_OFF

FAR_FLT_EN

MONO_FLT_EN

BG_SEL

MONO_PROG

IAGC_CST[2:0]

Bit Name

Reset

Function

IAGC_OFF

AGC Disable

0: Internal AGC is active

1: Internal AGC is disabled

FAR_FLT_EN

1: Enable Farrow filter for NICAM

MONO_FLT_EN

1: Enable Mono filter for NICAM

BG_SEL

1: BG NICAM Mono filter selected

MONO_PROG

1: Enable programmation of Mono filter

IAGC_CST[2:0]

011

Internal AGC Programmable Step Constant.

These bits control the time per step (values given for QPSK mode). The default value defines the

optimum trade-off between fast settling time (for the fastest NICAM identification) and the noise

immunity (minimum BER degradation)

Step time (us) Time Response (ms)

000

703

128

001

352

010

176

011

100

101

110

111

5.5

0.82

Address: 27h

Type: R

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

IAGC_CTRL[7:0]

Bit Name

Reset

Function

IAGC_CTRL[7:0]

00000000

Indicates the value of the internal AGC gain control

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