- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄17022 > AD9279-65EBZ (Analog Devices Inc)BOARD EVALUATION FOR AD9279 PDF資料下載
參數(shù)資料
| 型號： | AD9279-65EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 21/44頁 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD9279 |
| 標準包裝： | 1 |
| ADC 的數(shù)量： | 8 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 80M |
| 數(shù)據(jù)接口： | 串行 |
| 工作溫度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD9279 |
| 已供物品： | 板 |
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頁當前第21頁第22頁第23頁第24頁第25頁第26頁第27頁第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
AD9279
Rev. 0 | Page 28 of 44
0.1F
CMOS DRIVER
OPTIONAL
100
0.1F
CLK
*50
RESISTOR IS OPTIONAL.
AD951x FAMILY
3.3V
OUT
VFAC3
09
42
3-
0
59
CLK–
CLK+
AD9279
50
*
Figure 57. Single-Ended 3.3 V CMOS Sample Clock
Clock Duty Cycle Considerations
Typical high speed ADCs use both clock edges to generate a
variety of internal timing signals. As a result, these ADCs may
be sensitive to the clock duty cycle. Commonly, a 5% tolerance is
required on the clock duty cycle to maintain dynamic performance
characteristics. The AD9279 contains a duty cycle stabilizer (DCS)
that retimes the nonsampling edge, providing an internal clock
signal with a nominal 50% duty cycle. This allows a wide range
of clock input duty cycles without affecting the performance of
the AD9279. When the DCS is on, noise and distortion perfor-
mance are nearly flat for a wide range of duty cycles. However,
some applications may require the DCS function to be off. If so,
keep in mind that the dynamic range performance can be affected
when operated in this mode. See Table 19 for more details on
using this feature.
The duty cycle stabilizer uses a delay-locked loop (DLL) to
create the nonsampling edge. As a result, any changes to the
sampling frequency require approximately eight clock cycles
to allow the DLL to acquire and lock to the new rate.
Clock Jitter Considerations
High speed, high resolution ADCs are sensitive to the quality of the
clock input. The degradation in SNR at a given input frequency (fA)
due only to aperture jitter (tJ) can be calculated as follows:
SNR Degradation = 20 × log 10(1/2 × π × fA × tJ)
In this equation, the rms aperture jitter represents the root mean
square of all jitter sources, including the clock input, analog input
signal, and ADC aperture jitter. IF undersampling applications
are particularly sensitive to jitter (see Figure 58).
The clock input should be treated as an analog signal in cases
where aperture jitter may affect the dynamic range of the AD9279.
Power supplies for clock drivers should be separated from the
ADC output driver supplies to avoid modulating the clock signal
with digital noise. Low jitter, crystal-controlled oscillators make
the best clock sources, such as the Valpey Fisher VFAC3 series.
If the clock is generated from another type of source (by gating,
dividing, or other methods), it should be retimed by the original
clock during the last step.
Refer to the AN-501 Application Note and the AN-756
Application Note for more in-depth information about how
jitter performance relates to ADCs (visit www.analog.com).
1
10
100
1000
16 BITS
14 BITS
12 BITS
30
40
50
60
70
80
90
100
110
120
130
0.125ps
0.5ps
1.0ps
2.0ps
ANALOG INPUT FREQUENCY (MHz)
10 BITS
8 BITS
RMS CLOCK JITTER REQUIREMENT
S
NR
(
d
B
)
09
42
3-
06
0
0.25ps
Figure 58. Ideal SNR vs. Input Frequency and Jitter
Power Dissipation and Power-Down Mode
As shown in Figure 59 and Figure 60, the power dissipated by
the AD9279 is proportional to its sample rate. The digital power
dissipation does not vary significantly because it is determined
primarily by the DRVDD supply and the bias current of the
LVDS output drivers.
350
300
250
200
150
100
50
0
1020
30
40
50
60
7080
SAMPLING FREQUENCY (MSPS)
CU
RRE
N
T
S
(
m
A
)
09
42
3-
06
1
MODE III,
fSAMPLE = 80MSPS
IDRVDD
MODE II,
fSAMPLE = 65MSPS
MODE I,
fSAMPLE = 40MSPS
Figure 59. Supply Current vs. fSAMPLE for fIN = 5 MHz
180
170
160
150
140
130
120
110
0
1020
30
40
50
60
7080
SAMPLING FREQUENCY (MSPS)
P
O
W
E
R/
CHANN
E
L
(
m
W
/C
H)
09
42
3-
06
2
MODE III,
fSAMPLE = 80MSPS
MODE II,
fSAMPLE = 65MSPS
MODE I,
fSAMPLE = 40MSPS
Figure 60. Power per Channel vs. fSAMPLE for fIN = 5 MHz
The AD9279 features scalable LNA bias currents (see Table 19,
Register 0x12). The default LNA bias current settings are high.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD9222-65EBZ | BOARD EVALUATION AD9222 65MSPS |
| CM453232-102KL | INDUCTR CHIP 1000UH 10% 1812 SMD |
| 1210R-681K | COIL .68UH IRON SMD |
| AD9212-65EBZ | BOARD EVALUATION FOR AD9212 |
| MAX11040EVKIT+ | KIT EVALUATION FOR MAX11040 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD9279-80KITZ | 功能描述:KIT EVALUATION FOR AD9279 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:- 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標準）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件 |
| AD9279BBCZ | 功能描述:IC ADC 12BIT 80MSPS 144CSPBGA RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:數(shù)據(jù)采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數(shù)據(jù)接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數(shù)字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設(shè)備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| AD9279-BBCZ | 制造商:AD 制造商全稱:Analog Devices 功能描述:Octal LNA/VGA/AAF/ADC and CW I/Q Demodulator |
| AD9280 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Complete 8-Bit, 32 MSPS, 95 mW CMOS A/D Converter |
| AD9280ARS | 功能描述:IC ADC CMOS 8BIT 32MSPS 28-SSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 位數(shù):12 采樣率（每秒）:3M 數(shù)據(jù)接口:- 轉(zhuǎn)換器數(shù)目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設(shè)備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數(shù)目和類型:- |
發(fā)布緊急采購，3分鐘左右您將得到回復。