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參數資料
| 型號： | AD9873 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Analog Front End Converter for Set-Top Box, Cable Modem |
| 中文描述： | 模擬前端轉換器，用于機頂盒，電纜調制解調器 |
| 文件頁數： | 13/39頁 |
| 文件大小： | 935K |
| 代理商： | AD9873 |
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REV. 0
AD9873
–13–
0Fh, Bit 4, Bit 5: Profile Select
The AD9873 quadrature digital upconverter is capable of storing
four preconfigured modulation modes called profiles that define
a transmit frequency tuning word and cable driver amplifier con-
trol. Profile Select bits <1:0> or PROFILE [1:0] pins program
the current register profile to be used. Profile Select bits should
always be 0 if PROFILE pins are used to switch between pro-
files. Using the Profile Select bits as a means of switching between
different profiles requires the PROFILE pins to be tied low.
10h–1Fh: Burst Parameter
Tx Frequency Tuning Words
The frequency tuning word (FTW) determines the DDS-
generated carrier frequency (f
C
) and is formed via a concatenation
of register addresses. Bit 7 of register address 1Ah is the most
significant bit of the profile 2-frequency tuning word. Bit 0 of
register address 18h is the least significant bit of the profile
2-frequency tuning word.
The output frequency equation is given as:
f
C
= (
FTW
×
f
SYSCLK
)/2
24
.
Where
f
SYSCLK
= Mx f
OSCIN
and
FTW
< 80 00 00 h
Changes to FTW bytes immediately take effect on active profiles.
Cable Driver Gain Control
The AD9873 dedicates three output pins that directly interface to
the AD832x-family of gain programmable cable driver amplifier.
This allows direct control of the cable driver’s gain via the
AD9873. New data is automatically sent to the cable driver
amplifier whenever a new burst profile with different gain setting
becomes active or when the gain contents of an active AD8321/
AD8323 gain control register changes. Default value is 00h
(lowest gain).
相關PDF資料 |
PDF描述 |
|---|---|
| AD9873-EB | Analog Front End Converter for Set-Top Box, Cable Modem |
| AD9873JS | Analog Front End Converter for Set-Top Box, Cable Modem |
| AD9874 | IF Digitizing Subsystem |
| AD9874BST | IF Digitizing Subsystem |
| AD9874EB | IF Digitizing Subsystem |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD9873-EB | 制造商:Analog Devices 功能描述: |
| AD9873JS | 制造商:Analog Devices 功能描述: |
| AD9874 | 制造商:AD 制造商全稱:Analog Devices 功能描述:IF Digitizing Subsystem |
| AD9874ABST | 功能描述:IC IF DIGIT SUBSYSTEM 48-LQFP RoHS:否 類別:RF/IF 和 RFID >> RF 其它 IC 和模塊 系列:- 標準包裝:100 系列:* |
| AD9874ABST | 制造商:Analog Devices 功能描述:IF DIGITIZING SYBSYSTEM ((NW)) 制造商:Analog Devices 功能描述:IC, IF DIGITIZING SUBSYSTEM, LQFP-48 |
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