GC1012A Datasheet, PDF (16/30 Pages) Texas Instruments – DIGITAL TUNER CHIP

GC1012A DIGITAL TUNER
DATA SHEET REV 0.1
3.1 FREQUENCY WORD REGISTERS
Registers 0, 1, 2, and 3 contain the 28 bit frequency tuning word. Bit 0 is the LSB, bit 27 is the MSB.
ADDRESS 0:
FREQUENCY BYTE 0
BIT
TYPE
NAME
DESCRIPTION
0-7
R/W
FREQ[0:7]
Byte 0 (least significant) of frequency word
ADDRESS 1:
FREQUENCY BYTE 1
BIT
TYPE
NAME
DESCRIPTION
0-7
R/W
FREQ[8:15]
Byte 1 of frequency word
ADDRESS 2:
FREQUENCY BYTE 2
BIT
TYPE
NAME
DESCRIPTION
0-7
R/W
FREQ[16:23]
Byte 2 of frequency word
ADDRESS 3:
FREQUENCY BYTE 3
BIT
TYPE
NAME
DESCRIPTION
0-3
R/W
FREQ[24:27]
4 most significant bits of the frequency word
4-7
R/W
-
unused
If the desired tuning frequency is F, then the frequency word should be set to:
FREQ = 2²⁸F/(clock rate)
GRAYCHIP,INC.
- 11 -
FEBRUARY 18, 1998
This document contains information which may be changed at any time without notice