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MAX7057ASE PDF预览

MAX7057ASE

更新时间: 2024-09-26 11:14:59
品牌 Logo 应用领域
美信 - MAXIM /
页数 文件大小 规格书
20页 247K
描述
300MHz to 450MHz Frequency-Programmable ASK/FSK Transmitter

MAX7057ASE 数据手册

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19-4093; Rev 1; 4/11  
300MHz to 450MHz Frequency-Programmable  
ASK/FSK Transmitter  
MAX057  
General Description  
Features  
The MAX7057 frequency-programmable UHF transmit-  
ter is designed to transmit ASK/FSK data at a wide  
range of frequencies from 300MHz to 450MHz. The  
MAX7057 has internal tuning capacitors at the output of  
the power amplifier that are programmable for match-  
ing to an antenna or load. This allows the user to  
change to a new frequency and match the antenna at  
the new frequency simultaneously. The MAX7057 trans-  
mits at a data rate up to 100kbps nonreturn-to-zero  
(NRZ) (50kbps Manchester coded). Typical transmitted  
power into a 50load is +9.2dBm with a +2.7V supply.  
The device operates from +2.1V to +3.6V and typically  
draws under 12.5mA of current in FSK mode (8.5mA in  
ASK mode) when the antenna-matching network is  
designed to operate over the 315MHz to 433.92MHz  
frequency range. For narrower operating frequency  
ranges, the matching network can be redesigned to  
improve efficiency. The standby current is less than  
1µA at room temperature.  
o Programmable Frequency Operation with Single  
Crystal  
o Internal Variable Capacitor for Antenna Tuning  
with Single-Matching Network  
o 100kbps Data Rate (NRZ)  
o +2.1V to +3.6V Single-Supply Operation  
o < 12.5mA (FSK), < 8.5mA (ASK) DC Current Drain  
o < 1µA Standby Current  
o ASK/FSK Modulation  
o 47% Carrier Tuning Range Using One Crystal  
Ordering Information  
PART  
TEMP RANGE  
PIN-PACKAGE  
MAX7057ASE+  
-40°C to +125°C  
16 SO  
The MAX7057 reference frequency from the crystal  
oscillator is multiplied by a fully integrated fractional-N  
phase-locked loop (PLL). The multiplying factor of the  
PLL is set by a 16-bit number, with 4 bits for integer  
and 12 bits for fraction; the multiplying factor can be  
anywhere between 19 and 28. The 12-bit fraction in the  
synthesizer sets a tuning resolution equal to the refer-  
ence frequency divided by 4096; frequency deviation  
can be set as low as 2kHz and as high as 100kHz.  
The fractional-N synthesizer eliminates the problems  
associated with oscillator-pulling FSK signal generation.  
The MAX7057 has a serial peripheral interface (SPI™)  
for selecting all the necessary settings.  
+Denotes a lead(Pb)-free package/RoHs-compliant package.  
Pin Configuration  
TOP VIEW  
+
16  
15  
CS  
SDI  
1
2
3
4
5
DVDD  
GPO  
MAX7057  
SCLK  
DGND  
DIN  
14  
13  
12  
11  
10  
9
The MAX7057 is available in a 16-pin SO package and  
is specified to operate in the -40°C to +125°C automo-  
tive temperature range.  
PAGND  
PAOUT  
ROUT  
PAVDD  
AVDD  
ENABLE  
AGND  
XTAL1  
XTAL2  
Applications  
RF Remote Controls  
6
7
8
Garage Door Openers  
Home Automation  
Automotive  
Wireless Sensors  
Wireless Game Consoles  
Wireless Computer Peripherals  
Security Systems  
Typical Application Circuit and Functional Diagram appear  
at end of data sheet.  
SPI is a trademark of Motorola, Inc.  
________________________________________________________________ Maxim Integrated Products  
1
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.  

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