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PDF MAX1470 Data sheet ( Hoja de datos )
| Número de pieza | MAX1470 | |
| Descripción | 315MHz Low-Power / +3V Superheterodyne Receiver | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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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
LNASRC
4
14
DVDD
2,7
AVDD
13
DGND
5,10
AGND
LNAOUT
6
MIXIN1
8
MIXIN2
9
LNA
MAX1470
Q
DIVIDE
BY 64
PHASE
DETECTOR
VCO
LOOP
FILTER
I
0°
90°
MIXOUT IFIN1
12 17
IFIN2
18
IF
LIMITING
AMPS
RSSI
DATA
FILTER
RDF2
100kΩ
RDF1
100kΩ
CRYSTAL
DRIVER
1 28
SHUTDOWN
DATA
SLICER
27 25
20 19
PEAK
DETECTOR
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.
1 page  
315MHz Low-Power, +3V Superheterodyne
Receiver
Typical Operating Characteristics (continued)
(VDD = +3.3V, TA = +25°C, unless otherwise noted. Typical Application Circuit.)
5
0
-5
-10
-15
-20
1
NORMALIZED IF GAIN
vs. IF FREQUENCY
3dB BANDWIDTH = 11.7MHz
10
IF FREQUENCY (MHz)
100
IMAGE REJECTION
vs. RF FREQUENCY
60
50
40
30
20
150 200 250 300 350 400 450 500
RF FREQUENCY (MHz)
S11 MAGNITUDE-LOG PLOT OF RFIN
MAX1470 toc12
S11 SMITH PLOT OF RFIN
0dB
10dB/
div
315MHz,
-29.5dB
50MHz
1GHz
315MHz
50MHz
1GHz
_______________________________________________________________________________________ 5
5 Page 
315MHz Low-Power, +3V Superheterodyne
Receiver
Pin Configuration
TOP VIEW
XTAL1 1
AVDD 2
LNAIN 3
LNASRC 4
AGND 5
LNAOUT 6
AVDD 7
MIXIN1 8
MIXIN2 9
AGND 10
I.C. 11
MIXOUT 12
DGND 13
DVDD 14
MAX1470
TSSOP
28 XTAL2
27 PWRDN
26 PDOUT
25 DATAOUT
24 I.C.
23 I.C.
22 DF
21 OPP
20 DSN
19 DSP
18 IFIN2
17 IFIN1
16 I.C.
15 I.C.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX1470.PDF ] | |
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