GC4014 datasheet(31/46 Pages) TI

31 / 46 page

GRAYCHIP, INC.

- 26 -

APRIL 27, 1999

GC4014 QUAD RECEIVER CHIP

DATA SHEET REV 0.6

This document contains information which may be changed at any time without notice

ADDRESS 23:

Channel Control

, suggested default = 0x0, power up reset to 0.

BIT

TYPE

NAME

DESCRIPTION

0,1 LSB

R/W

INPUT

This two bit field selects which chip input should be used by the

channel. INPUT = 0,1,2 and 3 correspond to inputs A, B, C and

R/W

DIAG

Use the diagnostic source as the channel input. See Address 12

(Section 5.11).

R/W

BLANK

Turn on blanking for this channel. See address 8, Section 5.8

4-6

R/W

COARSE

The COARSE gain setting used for this channel. See Sections

5.4 and 5.5 for details.

7 MSB

R/W

POWER_DOWN

Used to force the channel into the power down state.

ADDRESS 24:

Channel Sync Modes

, suggested default = 0x5f

BIT

TYPE

NAME

DESCRIPTION

0,1 LSB

R/W

FREQ_SYNC

The new frequency setting takes affect on this sync.

2,3

R/W

PHASE_SYNC

The new phase offset takes affect on this sync

4,5

R/W

NCO_SYNC

The NCO is initialized to the phase setting by this sync

6,7 MSB

R/W

DITHER_SYNC

The dither circuit is initialized by this sync to zero.

These syncs use the selections shown in Table 4.

The NCO_SYNC is usually set to be always off, unless the user wants to coherently control the phases of

multiple channels.

The FREQ_SYNC and PHASE_SYNC are typically set to be always on so that frequency and phase

settings will take effect immediately as they are written into their control registers.

The DITHER_SYNC is used to turn on or off the dithering of the NCO phase. To turn off dithering set the

DITHER_SYNC to be always on so that it remains initialized to zero. To turn dithering on set the sync to be always

off.

During diagnostics the NCO_SYNC and DITHER_SYNC should be set to “TC”.

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