參數(shù)資料
型號(hào)： GC1012A-CQ
廠商： Texas Instruments, Inc.
英文描述： DIGITAL TUNER CHIP
中文描述： 數(shù)字調(diào)諧器芯片
文件頁數(shù)： 18/30頁
文件大?。?/td> 186K
代理商： GC1012A-CQ
GRAYCHIP,INC.
- 13 -
FEBRUARY 18, 1998
GC1012A DIGITAL TUNER
DATA SHEET REV 0.1
This document contains information which may be changed at any time without notice
3.3
FILTER MODE REGISTER
This register controls filtering, output formatting and the diagnostic input mode.
ADDRESS 5:
Filter Mode Register
BIT
TYPE
NAME
DESCRIPTION
0-2
R/W
DEC[0:2]
The decimation mode. The output sample rate is set using
DEC
according to the
following table:
F
O
DECCOMPLEX
(REAL = 0)
0 or 1F
CK
2
F
CK
/2
F
CK
3
F
CK
/4
F
CK
/2
4
F
CK
/8
F
CK
/4
5
F
CK
/16 F
CK
/8
6
F
CK
/32 F
CK
/16
7
F
CK
/64 F
CK
/32
Where F
CK
is the input rate and F
O
is the output rate.
F
O
REAL
(REAL = 1)
3
R/W
-
Unused.
4
R/W
REAL
Output real samples instead of complex samples. The output spectrum is centered from
0 to F
O
/2 where F
O
is the output rate (see
DEC
above for the REAL mode). NOTE: The
FLIP bit described below is active low in the real mode.
5
R/W
OFFSET
Offset the complex output spectrum. Used in the complex output mode (REAL=0) to
force the output spectrum to be centered at F
O
/2, where F
O
is the output sample rate
(see
DEC
above for the COMPLEX mode). This mode is useful for single-sideband AM
signals because it moves the lower band edge up to zero frequency where it belongs.
The upper half of the spectrum will appear as negative frequencies.
6
R/W
FLIP
Flip the output spectrum. This bit inverts the output spectrum. In the complex mode the
spectrum is flipped about zero. In the real mode the spectrum is flipped about F
O
/4,
where F
O
is the real modes output sample rate. In the complex mode FLIP=1 flips the
spectrum. In the real mode FLIP=0 flips the spectrum.
7
R/W
DIAG
Use the diagnostic ramp for the input to the chip instead of the
X
input. The ramp counts
from -2048 to +2047 and then starts over again.
The effect on the output spectrum of the REAL, OFFSET and FLIP bits is illustrated in the following
diagram. (F
O
is the output sample rate)
Figure 4. Output Spectral Formats
0
-F
O
+F
O
NORMAL (FLIP=0 OFFSET=0 REAL=0)
0
-F
O
+F
O
FLIPPED (FLIP=1)
-F
O
+F
O
OFFSET AND FLI0
-F
O
/2
+F
O
/2
REAL AND FLIPP0
-F
O
+F
O
OFFSET (OFFSET0
-F
O
/2
+F
O
/2
REAL MODE (REA0
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