STV0299B datasheet(22/36 Pages) STMICROELECTRONICS

22 / 36 page

STV0299B

5REGISTER LIST (continued)

22/36

INPUT/OUTPUT CONFIGURATION REGISTER (refer to

Section 4.2.1 on page 12)

IOCFG

OP1 control

1: Open drain

0: Normal

OP1 value

OP0 control

1: Open drain

0: Normal

OP0 value

This bit must be programmed to zero.

[2:1]

Nyquist Filter

These bits determine Nyquist filter settings:

00 = raised cosine at 35%

01 = raised cosine at 20%

10 = reserved

11 = reserved

Bit 0 when set, multiplies the data on the Q input by -1 in order to

accommodate QPSK modulation with another convention of rotation

sense. This is equivalent to a permutation of I and Q inputs, or a spec-

tral symmetry. This permutation is performed after derotation.

AGC1 CONTROL REGISTER (refer to

Section 4.2.2 on page 12)

AGC1C

DC offset compensation:

1: On

0: Off

[6:3]

These bits must be programmed to zero.

[2:0]

beta_agc1

TIMING LOOP REGISTER (refer to

Section 4.3.1 on page 13)

RTC

This bit must be programmed to zero.

[6:4]

alpha_tmg

This bit must be programmed to zero.

[2:0]

beta_tmg

AGC1 REFERENCE REGISTER (refer to

Section 4.2.2 on page 12)

AGC1R

Iagc

1: Invert

0: Normal

If Iagc is set, the output signal is complemented (i.e. a high value for

the AGC voltage will cause a high gain in the tuner).

This bit must be programmed to zero.

[5:0]

AGC1 Reference Value (m1). Refer to page 12.

AGC2 AND OFFSET CONTROL REGISTER (refer to

Section 4.2.5 on page 12)

AGC2O

[7:5]

AGC2 Coefficient

[4:0]

AGC2_Ref (m2)

Name

HEX

Address

Reset

Value

Bit

Position

Signal Description

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