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参数资料
| 型号： | AD9878BST |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 通信及网络 |
| 英文描述： | Mixed-Signal Front End for Broadband Applications |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQFP100 |
| 封装： | MS-026BED, LQFP-100 |
| 文件页数： | 20/36页 |
| 文件大小： | 749K |
| 代理商： | AD9878BST |
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AD9878
THEORY OF OPERATION
For a general understanding of the AD9878, refer to Figure 23, a
block diagram of the device architecture. The device consists of a
transmit path, receive path, and auxiliary functions, such as a PLL,
a ∑- DAC, a serial control port, and a cable amplifier interface.
Rev. A | Page 20 of 36
The transmit path contains an interpolation filter, a complete
quadrature digital upconverter, an inverse sinc filter, and a 12-bit
current output DAC.
The receive path contains a 10-bit ADC and dual 12-bit ADCs.
All internally required clocks and an output system clock are
generated by the PLL from a single crystal or clock input.
The 12-bit and 10-bit IF ADCs can convert direct IF inputs of
up to 70 MHz and run at sample rates of up to 29 MSPS. A video
input with an adjustable signal clamping level, along with the
10-bit ADC, allow the AD9878 to process an NTSC and a QAM
channel simultaneously.
The programmable ∑- DAC can be used to control external
components, such as variable gain amplifiers (VGAs) or voltage-
controlled tuners. The CA port provides an interface to the
AD832x family of programmable gain amplifier (PGA) cable
drivers, enabling host processor control via the MxFE serial
port (SPORT).
0
TxIQ[5:0]
TxSYNC
MCLK
REFCLK
CA PORT
PROFILE
SDIO
IF10[4:0]
RxSYNC
IF12[11:0]
FSADJ
XTAL
OSCIN
Σ
-
OUTPUT
FLAG[2:1]
IF10 INPUT
IF12B INPUT
VIDEO IN
6
3
12
12
12
AD9878
DATA
ASSEMBLER
QUADRATURE
MODULATOR
FIR LPF
CIC LPF
COS
SIN
DAC GAIN CONTROL
PLL
OSCIN
×
M
DDS
MUX
MUX
CA
INTERFACE
PROFILE
SELECT
SERIAL
INTERFACE
12
4
SINC
–1
MUX
DAC
IF10
IF12
ADC
ADC
10
12
12
4
5
5
12
12
I
Q
Rx PORT
Tx OUTPUT
Σ
-
INPUT
4
4
4
8
FLAG0
SINC
–1
BYPASS
(
f
OSCIN
)
(
f
OSCIN
)
(
f
MCLK
)
MUX
12
ADC
MUX
IF12A INPUT
DAC
+
–
CLAMP LEVEL
Σ
-
÷
R
÷
8
÷
2
÷
2
(
f
IQCLK
)
(
f
SYSCLK
)
(
f
OSCIN
)
÷
4
÷
4
Figure 23. AD9878 Block Diagram
相关PDF资料 |
PDF描述 |
|---|---|
| AD9878BSTZ | Mixed-Signal Front End for Broadband Applications |
| ADAV801 | Audio Codec for Recordable DVD |
| ADAV801ASTZ | Audio Codec for Recordable DVD |
| ADAV801ASTZ-REEL | Audio Codec for Recordable DVD |
| ADC0800PCD | ADC0800 8-Bit A/D Converter |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD9878BSTRL | 制造商:Analog Devices 功能描述:Mixed Signal Front End 100-Pin LQFP T/R 制造商:Analog Devices 功能描述:MIXED SGNL FRONT END 100LQFP - Tape and Reel |
| AD9878BSTZ | 功能描述:IC FRONT-END MIXED-SGNL 100-LQFP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模拟前端 (AFE) 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 位数:- 通道数:2 功率（瓦特）:- 电压 - 电源，模拟:3 V ~ 3.6 V 电压 - 电源，数字:3 V ~ 3.6 V 封装/外壳:32-VFQFN 裸露焊盘 供应商设备封装:32-QFN（5x5） 包装:带卷 (TR) |
| AD9878-EB | 制造商:Analog Devices 功能描述:EVAL KIT FOR MIXED-SGNL FRONT END FOR BROADBAND APPLICATIONS - Bulk |
| AD9879 | 制造商:AD 制造商全称:Analog Devices 功能描述:Mixed-Signal Front End Set-Top Box, Cable Modem |
| AD9879_05 | 制造商:AD 制造商全称:Analog Devices 功能描述:Mixed-Signal Front End Set-Top Box, Cable Modem |
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