HDM8513 datasheet(45/67 Pages) HYNIX

45 / 67 page

Control Parameters

Bit 0. Binary/Two’s Complement

When this bit is a zero, the system expects the six bit modulation input

samples in two’s complement format, otherwise the input should be in

offset binary format.

Bit 1. Spectrum Invert

When this bit is set to zero, the spectrum of the received signal is

inverted. This has the effect of complementing the in-phase channel

only.

Bit 2. Bias Cancel Enable

When this bit is a one, the internal circuit which cancels DC bias on the I

and Q inputs is enabled. When this function is enabled, it is assumed

that the input signal is scrambled with no significant DC component on

either the I or Q.

Bit 3. Symbol Track Enable

When this bit is set to one, the symbol tracking function is enabled.

When this bit is zero the symbol tracking frequency is forced to the

nominal 20 bit programmed value.

Bit 4. Carrier Track Enable

When this bit is set to one, the carrier phase tracking function is

enabled. When this bit is zero, the carrier frequency is forced to the 20

bit programmed value.

Bit 5. Sweep Hold

When this bit is set to one, the sweeping process is inhibited, and the

nominal carrier frequency remains at the last value.

Bit 6. Narrowband AGC Mode 1 Enable

When this bit is set to one and the narrowband AGC is in Mode 1, the

narrowband AGC self-adjusts to the optimum gain setting. When the bit

is set to zero, the most recent value is held without updating.

Bit 7. Automatic Detection of Spectrum Inversion

When this bit is set to one, the spectrum inversion is detected

automatically.

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