STV8217 datasheet(66/149 Pages) STMICROELECTRONICS

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STV82x7

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12.6

Demodulator Channel 2

IAGCR

Channel 2 Internal AGC Reference for QPSK

IAGCC

Channel 2 Internal AGC Time Constant for QPSK

Address: 25h

Type: R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

IAGC_REF[7:0]

Bit Name

Reset

Function

IAGC_REF[7:0]

10001000

Sets the mean value of the internal AGC, used for QPSK demodulation. The default setting

corresponds to half full scale amplitude at the baseband PLL input.

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

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