- 您现在的位置：买卖IC网 > PDF目录383349 > MAX2742ECM (MAXIM INTEGRATED PRODUCTS INC) Single-Chip Global Positioning System Receiver Front-End PDF资料下载
参数资料
| 型号： | MAX2742ECM |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 运动控制电子 |
| 英文描述： | Single-Chip Global Positioning System Receiver Front-End |
| 中文描述： | SWITCHED CAPACITOR FILTER, BANDPASS, QCC48 |
| 封装： | 7 X 7 MM, 1 MM HEIGHT, MS-026ABC, TQFN-48 |
| 文件页数： | 6/8页 |
| 文件大小： | 573K |
| 代理商： | MAX2742ECM |
M
Single-Chip Global Positioning System
Receiver Front-End
6
_______________________________________________________________________________________
Detailed Description
LNA/Mixer
The RF input from the GPS antenna is fed through an
LNA with a 24dB gain. The amplified signal is then fed
to a mixer that downconverts the signal (1575.42MHz)
to a quadrature differential IF of 1.023MHz.
IF Stage
The quadrature IF signals pass through the IF filter,
which rejects the out-of-band spurs by more than 60dB
and the image noise by 18dB (typ). After the image
reject filter, the signal is converted from quadrature to
differential. The filtered IF signal is then amplified by the
AGC block, which sets the VGA output signal level to a
predetermined value through the application using 50dB
of dynamic range. The internal offset-cancellation mech-
anism generates a highpass characteristic for the IF
section with a 1dB corner frequency of about 100kHz.
IF Output Selection
The sampled outputs of the GPS signal are available in
a single-ended or differential format. The IFSEL pin
controls the output format.
Synthesizer
An on-chip VCO provides quadrature differential LO
signals to the downconverting mixer and controls the
frequency. An on-board TCXO generates the reference
frequency. The integrated synthesizer includes the
VCO, TCXO buffer, main frequency divider, phase-fre-
quency detector, and charge pump. It uses an off-chip
PLL loop filter and TCXO. Connect the output of the
TCXO to XTALIN1 and XTALIN2 through a coupling
capacitor.
The main division ratio for the synthesizer is 684. With this
division ratio, a low-side injection LO can be synthesized
with an 18.414MHz TXCO.
Applications Information
Layout Issues
A properly designed PC board is an essential part of any
RF/microwave circuit. On all high-frequency inputs and
outputs, use controlled impedance lines and keep them
as short as possible to minimize losses and radiation.
Keeping the traces short also reduces parasitic induc-
tance. To further reduce the parasitic inductance, use
wider traces and a solid ground or power plane below
the signal traces. Also, place decoupling capacitors as
close to the supply pins as possible. For proper power
dissipation and operation, connect the metal exposed
paddle solidly to the ground plane of the PC board.
相关PDF资料 |
PDF描述 |
|---|---|
| MAX2751 | 2.4GHz Monolithic Voltage-Controlled Oscillators |
| MAX2752 | CLAMP |
| MAX2751EUA | 2.4GHz Monolithic Voltage-Controlled Oscillators |
| MAX2750 | 2.4GHz Monolithic Voltage-Controlled Oscillators |
| MAX2750-MAX2752 | POT 50K OHM 6MM CARBON SIDE ADJ |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX2742ECM+ | 功能描述:射频接收器 RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel |
| MAX2742ECM+C0V | 功能描述:射频接收器 RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel |
| MAX2742ECM+D | 功能描述:射频接收器 GPS Front End Downconverter RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel |
| MAX2742ECM+T | 制造商:Maxim Integrated Products 功能描述:RCVR 48TQFP EP - Tape and Reel |
| MAX2742ECM+TD | 功能描述:射频接收器 GPS Front End Downconverter RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。