- 您現在的位置：買賣IC網 > PDF目錄373972 > AD9957_07 (Analog Devices, Inc.) 1 GSPS Quadrature Digital Upconverter with 18-Bit IQ Data Path and 14-Bit DAC PDF資料下載
參數資料
| 型號： | AD9957_07 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 1 GSPS Quadrature Digital Upconverter with 18-Bit IQ Data Path and 14-Bit DAC |
| 中文描述： | 1 GSPS的正交數字上變頻器與18位智商數據路徑和14位DAC |
| 文件頁數： | 28/60頁 |
| 文件大小： | 840K |
| 代理商： | AD9957_07 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁當前第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁
AD9957
Rev. 0 | Page 28 of 60
RAM
32
10
Q
STATE
MACHINE
SCLK
I/O_RESET
SDIO
CS
RT
END ADDRESS
START ADDRESS
10
10
ADDRESS STEP RATE
16
RAM MODE
3
CLK
BASEBAND DATA CLOCK
I
16
IS
Q
QS
DDS CLOCK
UP/DOWN COUNTER
I CHANNEL
Q CHANNEL
RAM
SEGMENT
REGISTERS
S
A
D
U/D
32
2
(MSBs)
(LSBs)
16
0
NOTES
1. NONESSENTIAL FUNCTIONAL COMPONENTS ARE RENDERED IN GRAY.
Figure 42. RAM Playback to Baseband Data Path
OVERVIEW OF RAM PLAYBACK MODES
The RAM is operational in any one of four different
playback modes.
Ramp-up
Bidirectional ramp
Continuous bidirectional ramp
Continuous recirculate
RAM playback is only functional when the AD9957 is pro-
grammed for either the QDUC or interpolating DAC mode.
The RAM playback mode is selected via the 3-bit RAM
playback mode word located in each of the RAM segment
registers. Thus, the RAM playback mode is segment dependent.
The RAM playback mode bits are detailed in Table 6.
Table 6. RAM Playback Modes
RAM Playback Mode
Bits<2:0>
001
010
011
100
000, 101, 110, 111
RAM Playback Mode
Ramp-up
Bidirectional ramp
Continuous bidirectional ramp
Continuous recirculate
Not Valid
The continuous bidirectional ramp and continuous recirculate
modes are not available when the baseband scaling multipliers
serve as the destination of RAM playback.
RAM Ramp-Up Mode
In ramp-up mode, upon assertion of an I/O update or a state
change on the RT pin, the RAM begins playback operation
using the parameters programmed into the selected RAM
segment register. Data is extracted from RAM over the specified
address range contained in the start address and end address of
the active RAM segment register. The data is delivered at the
appropriate rate and to the destination as specified by the RAM
playback destination bit.
The playback rate is governed by the timer internal to the RAM
state machine and its period (Δt) is determined by the state of the
RAM playback destination bit as detailed in the RAM playback
operation section.
The internal state machine begins extracting data from the
RAM at the start address and continues to extract data until it
reaches the end address. Upon reaching this address, the state
machine halts.
A graphic representation of the ramp-up mode appears in
Figure 43. The upper trace shows the progression of the RAM
address from the start address to the end address for the active
RAM segment register. The address value advances by one with
each timeout of the timer internal to the state machine. The circled
numbers indicate specific events, explained as follows:
Event 1—an I/O update or state transition on the RT pin. This
event initializes the state machine to the start address of the active
RAM segment register.
Event 2—the state machine reaches the end address of the active
RAM segment register and halts.
START ADDRESS
RAM
ADDRESS
END ADDRESS
1
1 PDCLK CYCLE
OR
M DDS CLOCK CYCLES
Δ
t
I/O_UPDATE OR
RT TRANSITION
2
1
0
Figure 43. Ramp-Up Timing Diagram
相關PDF資料 |
PDF描述 |
|---|---|
| AD9958BCPZ-REEL7 | 2-Channel 500 MSPS DDS with 10-Bit DACs |
| AD9958 | 2-Channel 500 MSPS DDS with 10-Bit DACs |
| AD9958BCPZ | 2-Channel 500 MSPS DDS with 10-Bit DACs |
| AD9970 | 14-Bit CCD Signal Processor with Precision Timing Generator |
| AD9971 | 12-Bit CCD Signal Processor with Precision Timing |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD9957BCPZ | 制造商:Analog Devices 功能描述:GSPS QUADRATURE DIGITAL UPCONVERTER W/18-BIT IQ DATA PATH - Trays |
| AD9957BSVZ | 功能描述:IC DDS 1GSPS 14BIT IQ 100TQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 直接數字合成 (DDS) 系列:- 產品變化通告:Product Discontinuance 27/Oct/2011 標準包裝:2,500 系列:- 分辨率（位）:10 b 主 fclk:25MHz 調節字寬（位）:32 b 電源電壓:2.97 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:16-TSSOP 包裝:帶卷 (TR) |
| AD9957BSVZ-REEL | 功能描述:IC DDS 1GSPS 14BIT IQ 100TQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 直接數字合成 (DDS) 系列:- 產品變化通告:Product Discontinuance 27/Oct/2011 標準包裝:2,500 系列:- 分辨率（位）:10 b 主 fclk:25MHz 調節字寬（位）:32 b 電源電壓:2.97 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:16-TSSOP 包裝:帶卷 (TR) |
| AD9957BSVZREEL13 | 制造商:AD 制造商全稱:Analog Devices 功能描述:1 GSPS Quadrature Digital Upconverter w/18-Bit IQ Data Path and 14-Bit DAC |
| AD9958 | 制造商:AD 制造商全稱:Analog Devices 功能描述:2-Channel 500 MSPS DDS with 10-Bit DACs |
發布緊急采購，3分鐘左右您將得到回復。