SLWS132 Datasheet, PDF (31/46 Pages) Texas Instruments – QUAD RECEIVER CHIP

GC4014 QUAD RECEIVER CHIP
DATA SHEET REV 0.6
ADDRESS 23: Channel Control, suggested default = 0x0, power up reset to 0.
BIT
TYPE
NAME
DESCRIPTION
0,1 LSB
R/W
2
R/W
3
R/W
4-6
R/W
7 MSB
R/W
INPUT
DIAG
BLANK
COARSE
POWER_DOWN
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
D.
Use the diagnostic source as the channel input. See Address 12
(Section 5.11).
Turn on blanking for this channel. See address 8, Section 5.8
The COARSE gain setting used for this channel. See Sections
5.4 and 5.5 for details.
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
2,3
R/W
4,5
R/W
6,7 MSB
R/W
FREQ_SYNC
PHASE_SYNC
NCO_SYNC
DITHER_SYNC
The new frequency setting takes affect on this sync.
The new phase offset takes affect on this sync
The NCO is initialized to the phase setting by this 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”.
GRAYCHIP, INC.
- 26 -
APRIL 27, 1999
This document contains information which may be changed at any time without notice