ETC MAX2691

19-6158; Rev 0; 12/11
备 有 评 估 板
MAX2691
L2波段GPS低噪声放大器
概述
特性
MAX2691低噪声放大器(LNA)设计用于GPS L2波段产品。
采用Maxim先进的SiGe工艺设计，在提供高增益和低噪声
系数的同时，获得最高的输入参考1dB压缩点和3阶截点。
MAX2691具有17.5dB高增益以及不到1dB的噪声系数。
S高功率增益：17.5dB
器件采用+1.6V至+3.6V单电源供电，可选择关断功能使器
件的电源电流降至4µA (典型值)。器件采用超小尺寸、无
铅并符合RoHS标准的0.86mm x 0.86mm x 0.65mm晶片
级封装(WLP)。
S低电源电流：4.3mA
应用
S超薄外形：0.65mm
S低噪声系数：0.93dB
S集成50Ω输出匹配电路
S宽电源电压范围：1.6V至3.6V
S较少的材料清单：一个电感、两个电容
S小尺寸封装：0.86mm x 0.86mm
S0.4mm间距晶片级封装(WLP)
精密导航系统
远程信息处理(资产跟踪与管理)
航空设备
定购信息在数据资料的最后给出。
相关型号以及配合该器件使用的推荐产品，请参见：china.maxim-ic.
com/MAX2691.related。
典型应用电路
VCC
VCC
MAX2691
A1
A2
RFOUT
RF
OUTPUT
C2
R1
25kI
RF
INPUT
C1
L1
RFIN
B1
B2
GND
SHDN
OPTIONAL SHUTDOWN
MAX2691
L1 = 8.2nH
C1 = 100nF
C2 = 10pF
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本文是英文数据资料的译文，文中可能存在翻译上的不准确或错误。如需进一步确认，请在您的设计中参考英文资料。
有关价格、供货及订购信息，请联络Maxim亚洲销售中心：10800 852 1249 (北中国区)，10800 152 1249 (南中国区)，
或访问Maxim的中文网站：china.maxim-ic.com。
MAX2691
L2波段GPS低噪声放大器
Absolute Maximum Ratings
VCC to GND...........................................................-0.3V to +3.6V
Other Pins to GND
(except RFIN)....................-0.3V to (+ Operating VCC + 0.3V)
Maximum Current into RF Input..........................................10mA
Maximum RF Input Power................................................ +5dBm
Continuous Power Dissipation (TA = +70°C)
4-Bump WLP (derates 9.7mW/°C above +70°C).........776mW
Operating Temperature Range........................... -40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range............................. -65°C to +160°C
Lead Temperature (soldering, 10s)......... Reflow Profile (Note 1)
Soldering Temperature (reflow).......................................+260°C
Note 1: Refer to Application Note 1891: Wafer-Level Packaging (WLP) and Its Applications.
CAUTION! ESD SENSITIVE DEVICE
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
DC Electrical Characteristics
(MAX2691 EV kit, VCC = 1.6V to 3.6V, TA = -40°C to +85°C, no RF signals are applied. Typical values are at VCC = 2.85V and
TA = +25°C, unless otherwise noted.) (Note 2)
PARAMETER
CONDITIONS
Supply Voltage
MIN
TYP
MAX
1.6
2.85
3.6
4.3
SHDN = high
Supply Current
Digital Input Logic-High
Shutdown mode, SHDN = low
(Note 3)
Digital Input Logic-Low
(Note 3)
4.0
UNITS
V
mA
20
1.2
µA
V
0.45
V
AC Electrical Characteristics
(MAX2691 EV kit, VCC = 1.6V to 3.6V, TA = -40°C to +85°C, fRFIN = 1227MHz. Typical values are at VCC = 2.85V and TA = +25°C,
unless otherwise noted.) (Note 2)
PARAMETER
RF Frequency
CONDITIONS
MIN
L2 band
Power Gain (Note 4)
TYP
1227
VCC = 2.85V
13.3
17.5
VCC = 1.6V
13.1
17.4
MAX
UNITS
MHz
dB
Noise Figure
VCC = 1.6V to 3.3V
0.93
dB
In-Band 3rd-Order Input
Intercept Point
(Note 5)
-3.0
dBm
Input 1dB Compression Point
(Note 6)
-8.5
dBm
10.9
dB
Input Return Loss
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MAX2691
L2波段GPS低噪声放大器
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2691 EV kit, VCC = 1.6V to 3.6V, TA = -40°C to +85°C, fRFIN = 1227MHz. Typical values are at VCC = 2.85V and TA = +25°C,
unless otherwise noted.) (Note 2)
PARAMETER
CONDITIONS
MIN
Output Return Loss
Reverse Isolation
TYP
MAX
UNITS
15.6
dB
45
dB
Note 2: M
in and max limits guaranteed by test at TA = +25°C and guaranteed by design and characterization at TA = -40°C and
TA = +85°C, unless otherwise noted.
Note 3: Min and max limits guaranteed by test at TA = +25°C.
Note 4: Min limit guaranteed by design and characterization.
Note 5: M
easured with the two tones located at 1MHz and 2MHz offset from the center of the GPS band with -30dBm/tone.
Note 6: Measured with a tone located at 5MHz offset from the center of the GPS band.
典型工作特性
(MAX2691 EV kit. Typical values are at VCC = 2.85V, TA = +25°C, and fRFIN = 1227MHz, unless otherwise noted.)
GAIN vs. FREQUENCY
-5
-10
15
-10
-20
-20
-25
-30
-30
|S12| (dB)
10
GAIN (dB)
|S11| (dB)
-15
REVERSE ISOLATION vs. FREQUENCY
0
MAX2691 toc02
MAX2691 toc01
20
5
0
-35
-45
1000
1500
FREQUENCY (MHz)
2000
2500
-50
-70
-80
-10
500
-40
-60
-5
-40
MAX2691 toc03
INPUT RETURN LOSS vs. FREQUENCY
0
-90
500
1000
1500
FREQUENCY (MHz)
2000
2500
500
1000
1500
2000
2500
FREQUENCY (MHz)
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MAX2691
L2波段GPS低噪声放大器
典型工作特性(续)
(MAX2691 EV kit. Typical values are at VCC = 2.85V, TA = +25°C, and fRFIN = 1227MHz, unless otherwise noted.)
2
MAX2691 toc04
0
-5
1
TWO TONES LOCATED AT +1MHz AND +2MHz
FROM 1227MHz. PIN = -30dBm/TONE
TA = -40°C
IIP3 (dBm)
-15
-20
-3
-25
-4
500
1000
TA = +25°C
1500
2000
TA = +85°C
1.6
2500
2.1
2.6
3.1
FREQUENCY (MHz)
SUPPLY VOLTAGE (V)
INPUT P1dB COMPRESSION vs.
SUPPLY VOLTAGE AND TEMPERATURE
1dB GAIN DESENSE vs.
BLOCKER FREQUENCY
-8
TA = -40°C
TA = +25°C
-10
TA = +85°C
-12
-14
3.6
MAX2691 toc07
5
MAX2691 toc06
-6
INPUT P1dB (dBm)
-1
-2
0
BLOCKER POWER (dBm)
|S22| (dB)
0
-10
MAX2691 toc05
INBAND IIP3 vs. SUPPLY VOLTAGE
AND TEMPERATURE
OUTPUT RETURN LOSS vs. FREQUENCY
-5
-10
-15
-20
-16
1.6
2.1
2.6
SUPPLY VOLTAGE (V)
3.1
3.6
-25
500
1000
1500
2000
2500
BLOCKER FREQUENCY (MHz)
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MAX2691
L2波段GPS低噪声放大器
焊球配置
TOP VIEW
+
VCC
A1
A2
RFOUT (SHDN)
B2
GND
MAX2691
RFIN
B1
WLP
焊球说明
焊球
名称
功能
A1
VCC
A2
RFOUT
(SHDN)
B1
RFIN
RF输入，需要隔直流电容和外部匹配元件。
B2
GND
地，连接到PCB的接地平面。
电源电压，通过10pF电容旁路到地，电容应尽可能靠近IC放置。
RF输出/SHDN输入，RFOUT内部匹配至50Ω，通过1MΩ电阻上拉到VCC。SHDN与RFOUT共用一个焊
球，一旦VCC上电，器件将进入默认的有效工作模式；通过25kΩ电阻将RFOUT (SHDN)下拉至低电平，
将关断IC。
详细说明
MAX2691 LNA设计用于L2波段的GPS系统，器件具有关
断控制模式，无需外部电源开关。提供高增益、低噪声系
数以及出色的线性指标。
输入和输出匹配
MAX2691需要外部输入匹配电路，只需一个电感串联隔直
流电容即可构成输入匹配电路，典型应用电路 给出了推荐
的输入匹配网络。元件参数针对最佳增益、噪声系数、回
波损耗特性进行优化。减小输入耦合电容会降低IIP3。器
件集成了50Ω输出匹配电路，从而省去了外部匹配元件。
表1列出了器件的S参数和Kf值，典型噪声指标如表2所示。
关断
MAX2691提供关断控制功能，可关闭整个器件的工作。
由于RFOUT焊球(与SHDN共用一个焊球)通过电阻上拉到
VCC，所以器件在VCC上电时置于默认的有效工作模式。通
过一个适当的外部电阻(例如，25kΩ，以便在有效工作模
式下不会增大RF输出负荷)将RFOUT下拉至低电平，将关
断器件。
应用信息
合理设计PCB是确保RF微波电路正确工作的基础，所有
高频输入和输出应采用阻抗受控引线。通过去耦电容旁路
VCC，电容应尽可能靠近器件放置。VCC连线较长时，可能
需要增加去耦电容，这些新增电容可适当远离器件安装。
合理的GND布线是电路正确工作的保障，如果PCB顶层作
为RF地平面的话，将其直接连接到GND引脚。电路板地层
不在元件层时，则通过靠近封装的多个过孔将地层连接到
GND引脚。
有关MAX2691评估板的原理图、Gerber数据、PADS布局
文件、BOM信息，请访问：china.maxim-ic.com。
����������������������������������������������������������������� Maxim Integrated Products 5
MAX2691
L2波段GPS低噪声放大器
表1. S参数和K系数典型值
FREQ.
(MHz)
S11 MAG
(dB)
S11
PHASE
(DEGREES)
S21 MAG
(dB)
700
-2.1
-78.1
3.5
S21
S12
S12 MAG
PHASE
PHASE
(dB)
(DEGREES)
(DEGREES)
-175.7
-54.0
113.3
S22 MAG
(dB)
S22
PHASE
(DEGREES)
Kf
-1.3
-124.9
16.75126
800
-2.5
-87.1
6.0
175.7
-47.7
112.0
-1.6
-143.3
8.847551
900
-2.8
-96.2
8.8
163.0
-55.5
85.4
-2.4
-162.8
22.33037
1000
-3.1
-104.3
11.7
146.2
-53.8
54.0
-3.9
175.0
19.54059
1100
-3.4
-112.3
14.4
119.2
-46.3
33.8
-8.3
149.5
9.366309
1200
-3.7
-119.4
16.0
83.5
-46.9
15.3
-19.1
-126.9
9.788318
1220
-3.7
-120.7
16.1
75.6
-47.6
-1.0
-14.2
-114.7
10.25069
1240
-3.7
-122.4
16.0
67.9
-49.4
20.3
-10.9
-114.4
12.09861
1260
-3.8
-123.7
15.9
60.1
-49.7
14.9
-8.7
-118.5
12.1323
1280
-3.8
-125.0
15.6
52.8
-47.3
-6.0
-6.9
-124.3
8.793041
1300
-3.8
-126.6
15.2
46.0
-43.5
19.6
-5.7
-130.2
5.277003
1400
-4.0
-133.5
13.4
18.4
-44.9
-22.8
-2.6
-157.6
4.94144
1500
-4.1
-140.3
11.3
-0.5
-48.5
-21.4
-1.6
-179.3
6.656188
1600
-4.1
-147.6
9.4
-15.6
-47.7
-23.6
-1.3
163.8
5.983826
1700
-4.1
-154.6
7.8
-28.5
-44.8
-16.5
-1.0
148.8
4.18904
表2. 典型噪声参数(VCC = 2.85V、TA = +25℃)
FREQUENCY (MHz)
FMIN (dB)
|GOPT|
|GOPT| ANGLE
RN (I)
1200
0.66
0.45
47
8.37
1210
0.66
0.45
48
8.35
1220
0.66
0.45
48
8.33
1230
0.66
0.45
48
8.30
1240
0.66
0.45
49
8.28
1250
0.66
0.45
49
8.26
1260
0.66
0.45
50
8.24
1270
0.67
0.45
50
8.22
1280
0.67
0.44
50
8.20
1290
0.67
0.44
51
8.18
1300
0.67
0.44
51
8.17
定购信息
PART
TEMP RANGE
PIN-PACKAGE
MAX2691EWS+T
-40NC to +85NC
4 WLP
+表示无铅(Pb)/符合RoHS标准。
T = 卷带包装。
芯片信息
PROCESS: SiGe BiCMOS
封装信息
如需最近的封装外形信息和焊盘布局(占位面积)，请查询china.
maxim-ic.com/packages。 请 注 意， 封 装 编 码 中 的“+”、“#”
或“-”仅表示RoHS状态。封装图中可能包含不同的尾缀字符，
但封装图只与封装有关，与RoHS状态无关。
封装类型
封装编码
外形编号
焊盘布局编号
4 WLP
W40A0+1
21-0480
参见
应用笔记1891
����������������������������������������������������������������� Maxim Integrated Products 6
MAX2691
L2波段GPS低噪声放大器
修订历史
修订号
修订日期
0
12/11
说明
修改页
—
最初版本。
Maxim北京办事处
北京8328信箱 邮政编码100083
免费电话：800 810 0310
电话：010-6211 5199
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Maxim不对Maxim产品以外的任何电路使用负责，也不提供其专利许可。Maxim保留在任何时间、没有任何通报的前提下修改产品资料和规格的权利。电气
特性表中列出的参数值(最小值和最大值)均经过设计验证，数据资料其它章节引用的参数值供设计人员参考。
Maxim Integrated Products, Inc. 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000
© 2011 Maxim Integrated Products 7
Maxim是Maxim Integrated Products，Inc.的注册商标。
MAX2691 L2波段GPS低噪声放大器 - 概述
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Maxim > 产品 > 无线与射频(RF) > MAX2691
MAX2691
L2波段GPS低噪声放大器
低噪声系数GPS LNA，采用超小尺寸WLP封装，可提供不同的增益等级
概述 技术文档 定购信息 相关产品 所有内容 用户说明 (0) 状况
数据资料
型号
状况
英文
MAX2691
状况：生产中。详细情况请参考订购信息。
中文
概述
下载 Rev. 0 (PDF, 1.4MB)
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下载 Rev. 0 (PDF, 882kB)
E-Mail
MAX2691低噪声放大器(LNA)设计用于GPS L2波段产品。采用Maxim先进的SiGe工艺设计，在提供高增益和低噪
声系数的同时，获得最高的输入参考1dB压缩点和3阶截点。MAX2691具有17.5dB高增益以及不到1dB的噪声系
数。
器件采用+1.6V至+3.6V单电源供电，可选择关断功能使器件的电源电流降至4µA (典型值)。器件采用超小尺寸、
无铅并符合RoHS标准的0.86mm x 0.86mm x 0.65mm晶片级封装(WLP)。
关键特性
应用/使用
高功率增益：17.5dB
低噪声系数：0.93dB
集成50Ω输出匹配电路
低电源电流：4.3mA
宽电源电压范围：1.6V至3.6V
较少的材料清单：一个电感、两个电容
小尺寸封装：0.86mm x 0.86mm
超薄外形：0.65mm
0.4mm间距晶片级封装(WLP)
航空电子
Precision Navigation
远程信息处理(物品跟踪和库存管理)
关键特性:
Low-Noise Amplifiers
Part
Number
MAX2691 RF
Freq.
(MHz)
RF
Freq.
(MHz)
min
max
1150
1300
Noise
Figure
(dB)
Gain
(dB)
0.93
17.5
Input
IP3
(dBm)
I SUPPLY
(mA)
-3
4.3
Footprint
(mm x
mm)
Package/Pins
0.86 x 0.86
WLP/4
See Notes
查看所有Low-Noise Amplifiers (33)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may
differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized
distributor.
图表
http://china.maxim-ic.com/datasheet/index.mvp/id/6938[2012-08-28 8:50:16]
Budgetary Price
$1.15 @1k
MAX2691 L2波段GPS低噪声放大器 - 概述
Typical Application Circuit
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参考文献： 19- 6158 Rev. 0; 2012- 01- 04
本页最后一次更新: 2012- 01- 04
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http://china.maxim-ic.com/datasheet/index.mvp/id/6938[2012-08-28 8:50:16]
19-6158; Rev 0; 12/11
EVALUATION KIT AVAILABLE
MAX2691
L2 Band GPS Low-Noise Amplifier
General Description
The MAX2691 low-noise amplifier (LNA) is designed for
GPS L2 applications. Designed in Maxim’s advanced
SiGe process, the device achieves high gain and
low noise figure while maximizing the input-referred 1dB
compression point and the 3rd-order intercept point. The
MAX2691 provides a high gain of 17.5dB and sub 1dB
noise figure.
The device operates from a +1.6V to +3.6V single supply. The optional shutdown feature in the device reduces
the typical supply current to 4FA. The device is available
in a very small, lead-free, RoHS-compliant, 0.86mm x
0.86mm x 0.65mm wafer-level package (WLP).
Applications
Precision Navigation
Telematics (Asset Tracking and Management)
Features
SHigh-Power Gain: 17.5dB
SLow-Noise Figure: 0.93dB
SIntegrated 50Ω Output Matching Circuit
SLow Supply Current: 4.3mA
SWide Supply Voltage Range: 1.6V to 3.6V
SLow Bill of Materials: One Inductor, Two
Capacitors
SSmall Footprint: 0.86mm x 0.86mm
SThin Profile: 0.65mm
S0.4mm-Pitch Wafer-Level Package (WLP)
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to www.maxim-ic.com/MAX2691.related.
Avionics
Typical Application Circuit
VCC
VCC
MAX2691
A1
A2
RFOUT
RF
OUTPUT
C2
R1
25kI
RF
INPUT
C1
L1
RFIN
B1
B2
GND
SHDN
OPTIONAL SHUTDOWN
MAX2691
L1 = 8.2nH
C1 = 100nF
C2 = 10pF
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For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX2691
L2 Band GPS Low-Noise Amplifier
ABSOLUTE MAXIMUM RATINGS
VCC to GND...........................................................-0.3V to +3.6V
Other Pins to GND
(except RFIN)....................-0.3V to (+ Operating VCC + 0.3V)
Maximum Current into RF Input..........................................10mA
Maximum RF Input Power................................................ +5dBm
Continuous Power Dissipation (TA = +70°C)
4-Bump WLP (derates 9.7mW/°C above +70°C).........776mW
Operating Temperature Range........................... -40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range............................. -65°C to +160°C
Lead Temperature (soldering, 10s)......... Reflow Profile (Note 1)
Soldering Temperature (reflow).......................................+260°C
Note 1: Refer to Application Note 1891: Wafer-Level Packaging (WLP) and Its Applications.
CAUTION! ESD SENSITIVE DEVICE
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(MAX2691 EV kit, VCC = 1.6V to 3.6V, TA = -40°C to +85°C, no RF signals are applied. Typical values are at VCC = 2.85V and
TA = +25°C, unless otherwise noted.) (Note 2)
PARAMETER
CONDITIONS
Supply Voltage
MIN
TYP
MAX
1.6
2.85
3.6
4.3
SHDN = high
Supply Current
Digital Input Logic-High
Shutdown mode, SHDN = low
(Note 3)
Digital Input Logic-Low
(Note 3)
4.0
UNITS
V
mA
20
1.2
µA
V
0.45
V
AC ELECTRICAL CHARACTERISTICS
(MAX2691 EV kit, VCC = 1.6V to 3.6V, TA = -40°C to +85°C, fRFIN = 1227MHz. Typical values are at VCC = 2.85V and TA = +25°C,
unless otherwise noted.) (Note 2)
PARAMETER
RF Frequency
CONDITIONS
MIN
L2 band
Power Gain (Note 4)
TYP
1227
VCC = 2.85V
13.3
17.5
VCC = 1.6V
13.1
17.4
MAX
UNITS
MHz
dB
Noise Figure
VCC = 1.6V to 3.3V
0.93
dB
In-Band 3rd-Order Input
Intercept Point
(Note 5)
-3.0
dBm
Input 1dB Compression Point
(Note 6)
-8.5
dBm
10.9
dB
Input Return Loss
����������������������������������������������������������������� Maxim Integrated Products 2
MAX2691
L2 Band GPS Low-Noise Amplifier
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2691 EV kit, VCC = 1.6V to 3.6V, TA = -40°C to +85°C, fRFIN = 1227MHz. Typical values are at VCC = 2.85V and TA = +25°C,
unless otherwise noted.) (Note 2)
PARAMETER
CONDITIONS
MIN
Output Return Loss
Reverse Isolation
TYP
MAX
UNITS
15.6
dB
45
dB
Note 2: M
in and max limits guaranteed by test at TA = +25°C and guaranteed by design and characterization at TA = -40°C and
TA = +85°C, unless otherwise noted.
Note 3: Min and max limits guaranteed by test at TA = +25°C.
Note 4: Min limit guaranteed by design and characterization.
Note 5: Measured with the two tones located at 1MHz and 2MHz offset from the center of the GPS band with -30dBm/tone.
Note 6: Measured with a tone located at 5MHz offset from the center of the GPS band.
Typical Operating Characteristics
(MAX2691 EV kit. Typical values are at VCC = 2.85V, TA = +25°C, and fRFIN = 1227MHz, unless otherwise noted.)
GAIN vs. FREQUENCY
-5
-10
15
-10
-20
-20
-25
-30
-30
|S12| (dB)
10
GAIN (dB)
|S11| (dB)
-15
REVERSE ISOLATION vs. FREQUENCY
0
MAX2691 toc02
MAX2691 toc01
20
5
0
-35
-45
1000
1500
FREQUENCY (MHz)
2000
2500
-50
-70
-80
-10
500
-40
-60
-5
-40
MAX2691 toc03
INPUT RETURN LOSS vs. FREQUENCY
0
-90
500
1000
1500
FREQUENCY (MHz)
2000
2500
500
1000
1500
2000
2500
FREQUENCY (MHz)
����������������������������������������������������������������� Maxim Integrated Products 3
MAX2691
L2 Band GPS Low-Noise Amplifier
Typical Operating Characteristics (continued)
(MAX2691 EV kit. Typical values are at VCC = 2.85V, TA = +25°C, and fRFIN = 1227MHz, unless otherwise noted.)
2
MAX2691 toc04
0
-5
1
TWO TONES LOCATED AT +1MHz AND +2MHz
FROM 1227MHz. PIN = -30dBm/TONE
TA = -40°C
IIP3 (dBm)
-15
-20
-3
-25
-4
500
1000
TA = +25°C
1500
2000
TA = +85°C
1.6
2500
2.1
2.6
3.1
FREQUENCY (MHz)
SUPPLY VOLTAGE (V)
INPUT P1dB COMPRESSION vs.
SUPPLY VOLTAGE AND TEMPERATURE
1dB GAIN DESENSE vs.
BLOCKER FREQUENCY
-8
TA = -40°C
TA = +25°C
-10
TA = +85°C
-12
-14
3.6
MAX2691 toc07
5
MAX2691 toc06
-6
INPUT P1dB (dBm)
-1
-2
0
BLOCKER POWER (dBm)
|S22| (dB)
0
-10
MAX2691 toc05
INBAND IIP3 vs. SUPPLY VOLTAGE
AND TEMPERATURE
OUTPUT RETURN LOSS vs. FREQUENCY
-5
-10
-15
-20
-16
1.6
2.1
2.6
SUPPLY VOLTAGE (V)
3.1
3.6
-25
500
1000
1500
2000
2500
BLOCKER FREQUENCY (MHz)
����������������������������������������������������������������� Maxim Integrated Products 4
MAX2691
L2 Band GPS Low-Noise Amplifier
Bump Configuration
TOP VIEW
+
VCC
A1
A2
RFOUT (SHDN)
B2
GND
MAX2691
RFIN
B1
WLP
Bump Description
BUMP
NAME
A1
VCC
FUNCTION
A2
RFOUT
(SHDN)
B1
RFIN
RF Input. Requires a DC-blocking capacitor and external matching components.
B2
GND
Ground. Connect to the PCB ground plane.
Supply Voltage. Bypass to ground with a 10pF capacitor as close as possible to the IC.
RF Output/SHDN Input. RFOUT is internally matched to 50I and pulled up to VCC through a 1MI
resistor. SHDN is shared with the RFOUT bump. The device is in active mode by default once VCC
is applied. RFOUT(SHDN) can be pulled to a DC low through a 25kI resistor to shut down the IC.
Detailed Description
The MAX2691 LNA is designed for GPS L2 applications.
The device features a power-shutdown control mode
to eliminate the need for an external supply switch.
The device achieves high gain, low noise figure, and
excellent linearity.
Input and Output Matching
mode by default once VCC is applied, due to the on-chip
pullup resistor to VCC at the RFOUT bump (shared with
the SHDN input). To shut down the part, apply a logic-low
to the RFOUT bump through an external resistor with an
adequate value, e.g., 25kI, in order not to load the RF
output signal during active operation.
Applications Information
The MAX2691 requires an off-chip input match. Only an
inductor in series with a DC-blocking capacitor is needed
to form the input matching circuit. The Typical Application
Circuit shows the recommended input-matching network.
These values are optimized for the best simultaneous gain, noise figure, and return loss performance.
Reducing the input coupling capacitor results in a lower
IIP3. The device integrates an on-chip output matching
to 50I at the output, eliminating the need for external
matching components. Table 1 lists typical device S
parameters and Kf values. Typical noise parameters are
shown in Table 2.
A properly designed PCB is essential to any RF microwave circuit. Use controlled-impedance lines on all
high-frequency inputs and outputs. Bypass VCC with
decoupling capacitors located close to the device. For
long VCC lines, it may be necessary to add decoupling
capacitors. Locate these additional capacitors further
away from the device package. Proper grounding of
the GND pin is essential. If the PCB uses a topside RF
ground, connect it directly to the GND pin. For a board
where the ground is not on the component layer, connect
the GND pin to the board with multiple vias close to the
package.
Shutdown
Refer to www.maxim-ic.com for the MAX2691 EV kit
schematic, Gerber data, PADS layout file, and BOM
information.
The MAX2691 includes an optional shutdown feature to
turn off the entire chip. The device is placed in active
����������������������������������������������������������������� Maxim Integrated Products 5
MAX2691
L2 Band GPS Low-Noise Amplifier
Table 1. Typical S Parameter Values and K-Factor
FREQ.
(MHz)
S11 MAG
(dB)
S11
PHASE
(DEGREES)
S21 MAG
(dB)
S21
S12
S12 MAG
PHASE
PHASE
(dB)
(DEGREES)
(DEGREES)
S22 MAG
(dB)
S22
PHASE
(DEGREES)
Kf
700
-2.1
-78.1
3.5
-175.7
-54.0
113.3
-1.3
-124.9
16.75126
800
-2.5
-87.1
6.0
175.7
900
-2.8
-96.2
8.8
163.0
-47.7
112.0
-1.6
-143.3
8.847551
-55.5
85.4
-2.4
-162.8
1000
-3.1
-104.3
11.7
22.33037
146.2
-53.8
54.0
-3.9
175.0
1100
-3.4
-112.3
19.54059
14.4
119.2
-46.3
33.8
-8.3
149.5
1200
-3.7
9.366309
-119.4
16.0
83.5
-46.9
15.3
-19.1
-126.9
9.788318
1220
1240
-3.7
-120.7
16.1
75.6
-47.6
-1.0
-14.2
-114.7
10.25069
-3.7
-122.4
16.0
67.9
-49.4
20.3
-10.9
-114.4
12.09861
1260
-3.8
-123.7
15.9
60.1
-49.7
14.9
-8.7
-118.5
12.1323
1280
-3.8
-125.0
15.6
52.8
-47.3
-6.0
-6.9
-124.3
8.793041
1300
-3.8
-126.6
15.2
46.0
-43.5
19.6
-5.7
-130.2
5.277003
1400
-4.0
-133.5
13.4
18.4
-44.9
-22.8
-2.6
-157.6
4.94144
1500
-4.1
-140.3
11.3
-0.5
-48.5
-21.4
-1.6
-179.3
6.656188
1600
-4.1
-147.6
9.4
-15.6
-47.7
-23.6
-1.3
163.8
5.983826
1700
-4.1
-154.6
7.8
-28.5
-44.8
-16.5
-1.0
148.8
4.18904
Table 2. Typical Noise Parameters (VCC = 2.85V, TA = +25NC)
FREQUENCY (MHz)
FMIN (dB)
0.66
|GOPT|
0.45
|GOPT| ANGLE
47
RN (I)
8.37
1200
1210
1220
0.66
0.45
48
8.35
0.66
0.45
48
8.33
1230
0.66
0.45
48
8.30
1240
0.66
0.45
49
8.28
1250
0.66
0.45
49
8.26
1260
0.66
0.45
50
8.24
1270
0.67
0.45
50
8.22
1280
0.67
0.44
50
8.20
1290
0.67
0.44
51
8.18
1300
0.67
0.44
51
8.17
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX2691EWS+T
-40NC to +85NC
4 WLP
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Chip Information
PROCESS: SiGe BiCMOS
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maxim-ic.com/packages. Note that a
“+”, “#”, or “-” in the package code indicates RoHS status only.
Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
4 WLP
W40A0+1
21-0480
Refer to Application
Note 1891
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MAX2691
L2 Band GPS Low-Noise Amplifier
Revision History
REVISION
NUMBER
REVISION
DATE
0
12/11
DESCRIPTION
Initial release
PAGES
CHANGED
—
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.
Maxim reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical
Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2011
Maxim Integrated Products 7
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