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| 型號： | 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)： | 10/30頁 |
| 文件大?。?/td> | 186K |
| 代理商： | GC1012A-CQ |
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GRAYCHIP,INC.
- 5 -
FEBRUARY 18, 1998
GC1012A DIGITAL TUNER
DATA SHEET REV 0.1
This document contains information which may be changed at any time without notice
Figure 2. Filter Response
1.7
GAIN
The programmable bandwidth filter is followed by a gain circuit which adjusts the output level in 0.03
dB steps. The gain is controlled by the power of two gain value
S
and the fractional gain value
F
. The input
to output gain of the chip is equal to
G
= 2
(
S-
B)
(1+
F
/256), where
S
ranges from 0 to 15,
F
ranges from 0 to
255, and
B
is the base gain setting for each value of
D
. The base gain setting
B
gives a unity input to output
gain for the chip, i.e., a 12 bit constant going into the chip will come out in the 12 MSBs of the 16 bit output
word. The values of
B
are:
D
1
2
4
8
16
32
64
B
6
5
4
3
2
1
0
The
S
and
F
gain settings are double buffered so that they can be applied synchronously. A new
gain setting takes effect either when
S
is loaded, or, if the GS_MODE control bit is used, when the
GS
strobe
is received.
The gain settings and GS_MODE bit are stored in control registers 6 and 7.
Overflow detection circuitry detects overflow conditions in the gain output words and saturates the
samples to plus or minus full scale. Overflows are reported in the STATUS register and on the
OFLOW
output pin. The overflow status can be used to detect if the gain settings are too high.
(a) Overall
(b) Passband
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| GC1012A-PQ | 制造商:TI 制造商全稱:Texas Instruments 功能描述:DIGITAL TUNER CHIP |
| GC1012B | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3.3V DIGITAL TUNER CHIP |
| GC1012B_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3.3V DIGITAL TUNER CHIP |
| GC1012B-PQ | 功能描述:調(diào)諧器 Sgl channel WB DDC RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度: |
| GC1012B-PQA | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3.3V DIGITAL TUNER CHIP |
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