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| 型号： | MAX2670GTB+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 7/9页 |
| 文件大小： | 0K |
| 描述： | IC AMP GPS/GNSS FRONTEND 10TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| RF 型： | GPS/GNSS |
| 频率： | 1575MHz |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-TDFN-EP（3x3） |
| 包装： | 标准包装 |
| 其它名称： | MAX2670GTB+TDKR |
MAX2670
GPS/GNSS Front-End Amplifier
Detailed Description
The MAX2670 IC contains two LNA stages tuned for use
at 1575MHz.
AMP 1
AMP 1 has an internal load that limits the bandwidth and
provides a 50 I output impedance through a DC-blocking
capacitor. The internal biasing for AMP 1 suppresses
gain variation with changes in temperature and supply
voltage. At the input, an integrated DC-blocking capaci-
tor and matching network are intentionally omitted to
allow selection of external components to optimize for
noise or gain.
AMP 2 with Gain Step
The output of AMP 2 has the dual role of providing both
the RF output drive and receiving the DC power supply
through a single cable. Both the input and output ports
of AMP 2 are internally matched to 50 I impedance at
1575MHz. A 3.4dB gain switch can be used to adjust
the gain for different applications. The gain-select pin is
connected to an inverter with an internal pullup resistor.
Hence, the gain-select pin is set by default to high-gain
mode. Shorting the gain-select pin to ground sets the
gain stage to a 3.4dB lower gain. As with AMP 1, AMP
Alternate Supply (ALT_VCC)
The IC power can be supplied from the navigation sys-
tem through RFOUT2 (pin 5). An integrated filter is con-
nected to the output of LNA 2 to separate the supply volt-
age from the GPS signal. Alternatively, the supply voltage
can be applied to the external capacitor pin (pin 4).
Layout Considerations
For best performance, carefully lay out the PCB using
high-frequency techniques. Use controlled-impedance
transmission lines to interface with the MAX2670 high-
speed inputs and outputs and isolate the input sig-
nals from the output signals as much as possible. For
improved noise figure, keep the connection to the input
of LNA 1 as short as possible. A power-supply decou-
pling capacitor should be placed very close to pin 4 and
connected directly to a ground plane. If low-gain selec-
tion for LNA 2 is required, connect pin 7 directly to the
ground plane with a very short PCB trace. Good ground-
ing is critical for this device. The backside ground plane
should be as close as possible.
Refer to www.maxim-ic.com for the MAX2670 Evaluation
Kit schematic, gerber data, pads layout file and BOM
information.
2 has an internal load that limits the bandwidth, and the
amplifier’s internal biasing suppresses gain variation with
changes in temperature and supply voltage.
Typical Operating Circuit
LNA1 INPUT
SAW
LNA2 INPUT
ALT_VCC
V CC
REG
10
1
V CC
REG
4
6
LNA 1
LNA 2
5
RFOUT2/VCC
8/9
EXPOSED PAD
MAX2670
2/3
7
GAIN_SELECT
OPEN = 31.4dB GAIN
SHORT TO GROUND = 28dB GAIN
????????????????????????????????????????????????????????????????? Maxim Integrated Products 7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX2671EUT | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX2671EUT+ | 制造商:Maxim Integrated Products 功能描述:UP/DOWN CONV MIXER 3.3V/5V 2.5GHZ 6PIN SOT-23 - Rail/Tube 制造商:Maxim Integrated Products 功能描述:Mixer/Upconv, 0.4-2.5GHz, MAX2671EUT+ |
| MAX2671EUT+T | 功能描述:上下转换器 400MHz to 2.5GHz Upconverter RoHS:否 制造商:Texas Instruments 产品:Down Converters 射频:52 MHz to 78 MHz 中频:300 MHz LO频率: 功率增益: P1dB: 工作电源电压:1.8 V, 3.3 V 工作电源电流:120 mA 最大功率耗散:1 W 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PQFP-128 |
| MAX2671EUT-T | 功能描述:上下转换器 400MHz to 2.5GHz Upconverter RoHS:否 制造商:Texas Instruments 产品:Down Converters 射频:52 MHz to 78 MHz 中频:300 MHz LO频率: 功率增益: P1dB: 工作电源电压:1.8 V, 3.3 V 工作电源电流:120 mA 最大功率耗散:1 W 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PQFP-128 |
| MAX2671EUT-T+ | 制造商:Maxim Integrated Products 功能描述:Upconverter Mixer,MAX2671 400-2500MHz |
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