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MAX1470 查看數據表(PDF) - Maxim Integrated

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MAX1470 Datasheet PDF : 12 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
19-2135; Rev 1; 8/02
315MHz Low-Power, +3V Superheterodyne
Receiver
General Description
The MAX1470 is a fully integrated low-power CMOS
superheterodyne receiver for use with amplitude-shift-
keyed (ASK) data in the 315MHz band. With few
required external components, and a low-current
power-down mode, it is ideal for cost- and power-sensi-
tive applications in the automotive and consumer mar-
kets. The chip consists of a 315MHz low-noise amplifier
(LNA), an image rejection mixer, a fully integrated
315MHz phase-lock-loop (PLL), a 10.7MHz IF limiting
amplifier stage with received-signal-strength indicator
(RSSI) and an ASK demodulator, and analog baseband
data-recovery circuitry.
The MAX1470 is available in a 28-pin TSSOP package.
Applications
Remote Keyless Entry
Garage Door Openers
Remote Controls
Wireless Sensors
Wireless Computer Peripherals
Security Systems
Toys
Video Game Controllers
Medical Systems
Features
o Operates from a Single +3.0V to +3.6V Supply
o Built-In 53dB RF Image Rejection
o -115dBm Receive Sensitivity*
o 250µs Startup Time
o Low 5.5mA Operating Supply Current
o 1.25µA Low-Current Power-Down Mode for
Efficient Power Cycling
o 250MHz to 500MHz Operating Band (Image
Rejection Optimized at 315MHz)
o Integrated PLL with On-Board Voltage-Controlled
Oscillator (VCO) and Loop Filter
o Selectable IF Bandwidth Through External Filter
o Complete Receive System from RF to Digital Data
Out
*See Note 2, AC Electrical Characteristics.
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX1470EUI
-40°C to +85°C 28 TSSOP
Typical Application Circuit appears at end of data sheet.
Pin Configuration appears at end of data sheet.
Functional Diagram
3
LNAIN
4
LNASRC
14
DVDD
2,7
AVDD
13
DGND
5,10
AGND
LNAOUT
6
MIXIN1
8
MIXIN2
9
LNA
MAX1470
DIVIDE
BY 64
PHASE
DETECTOR
VCO
LOOP
FILTER
0°
Q
90°
I
MIXOUT IFIN1
12
17
IFIN2
18
IF
LIMITING
AMPS
RSSI
DATA
FILTER
RDF2
100k
RDF1
100k
CRYSTAL
DRIVER
SHUTDOWN
DATA
SLICER
PEAK
DETECTOR
1
28
27
25
20 19
26
21
22
XTAL1 XTAL2
PWRDN DATAOUT
DSN DSP
PDOUT
OPP
DF
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
 

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