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| 型号： | AD9272BSVZRL-40 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 17/44页 |
| 文件大小： | 0K |
| 描述： | IC ADC ASD OCTAL 40MSPS 100-TQFP |
| 设计资源： | Powering AD9272 with ADP5020 Switching Regulator PMU for Increased Efficiency (CN0135) |
| 标准包装： | 1,000 |
| 类型： | AAF，ADC，交叉点开关，LNA，VGA |
| 分辨率（位）： | 12 b |
| 采样率（每秒）： | 40M |
| 数据接口： | 串行 |
| 电压电源： | 模拟和数字 |
| 电源电压： | 1.8V，3V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 100-TQFP 裸露焊盘 |
| 供应商设备封装： | 100-TQFP-EP（14x14） |
| 包装： | 带卷 (TR) |
| 配用： | AD9272-65EBZ-ND - BOARD EVAL AD9272 |
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AD9272
Rev. C | Page 24 of 44
LNA Noise
The short-circuit noise voltage (input-referred noise) is an impor-
tant limit on system performance. The short-circuit input-referred
noise voltage for the LNA is 0.85 nV/√Hz at a gain of 21.3 dB,
including the VGA noise at a VGA postamp gain of 27 dB. These
measurements, which were taken without a feedback resistor,
provide the basis for calculating the input noise and noise figure
(NF) performance of the configurations shown in Figure 40.
VOUT
UNTERMINATED
+
–
LI-x
RIN
RS
VOUT
RESISTIVE TERMINATION
+
–
LI-x
RIN
RS
VOUT
ACTIVE IMPEDANCE MATCH
+
–
LI-x
RIN
RFB
1 + A/2
RS
RIN =
07
02
9-
10
4
Figure 40. Input Configurations
results using these configurations and an input-referred noise
voltage of 3.8 nV/√Hz for the VGA. Unterminated (RFB = ∞)
operation exhibits the lowest equivalent input noise and noise
figure. Figure 42 shows the noise figure vs. source resistance
rising at low RS—where the LNA voltage noise is large compared
with the source noise—and at high RS due to the noise contribution
from RFB. The lowest NF is achieved when RS matches RIN.
The main purpose of input impedance matching is to improve the
transient response of the system. With resistive termination, the
input noise increases due to the thermal noise of the matching
resistor and the increased contribution of the input voltage
noise generator of the LNA. With active impedance matching,
however, the contributions of both are smaller (by a factor of
1/(1 + LNA Gain)) than they would be for resistive termination.
Figure 41 shows the relative noise figure performance. In this
graph, the input impedance was swept with RS to preserve the
match at each point. The noise figures for a source impedance of
50 Ω are 7.3 dB, 4.2 dB, and 2.8 dB for the resistive termination,
active termination, and unterminated configurations, respectively.
The noise figures for 200 Ω are 4.5 dB, 1.7 dB, and 1 dB,
respectively.
of RIN, which is helpful for design purposes.
10
100
1k
0
1.5
3.0
4.5
6.0
7.5
9.0
10.5
12.0
RS ()
NO
IS
E
F
IG
U
RE
(
d
B)
UNTERMINATED
RESISTIVE TERMINATION
ACTIVE TERMINATION
07
02
9-
1
82
Figure 41. Noise Figure vs. RS for Resistive Termination,
Active Termination Matched, and Unterminated Inputs, VGAIN = 0.8 V
10
100
1k
0
1
2
3
4
5
6
7
8
RS ()
NO
IS
E
F
IG
U
RE
(
d
B)
RIN = 50
RIN = 75
RIN = 100
RIN = 200
UNTERMINATED
07
02
9-
1
83
Figure 42. Noise Figure vs. RS for Various Fixed Values of RIN,
Active Termination Matched Inputs, VGAIN = 0.8 V
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD9272BSVZRL-401 | 制造商:AD 制造商全称:Analog Devices 功能描述:Octal LNA/VGA/AAF/ADC and Crosspoint Switch |
| AD9272BSVZRL-65 | 功能描述:IC ADC ASD OCTAL 65MSPS 100-TQFP RoHS:是 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 电源电压:1.8 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| AD9272BSVZRL-651 | 制造商:AD 制造商全称:Analog Devices 功能描述:Octal LNA/VGA/AAF/ADC and Crosspoint Switch |
| AD9272BSVZRL-80 | 功能描述:IC ADC ASD OCTAL 80MSPS 100-TQFP RoHS:是 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 电源电压:1.8 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| AD9272BSVZRL-801 | 制造商:AD 制造商全称:Analog Devices 功能描述:Octal LNA/VGA/AAF/ADC and Crosspoint Switch |
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