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MAX1470EUI+

P1-P3P4-P6P7-P9P10-P12
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
♦ Operates from a Single +3.0V to +3.6V Supply
♦ Built-In 53dB RF Image Rejection
♦ -115dBm Receive Sensitivity*
♦ 250µs Startup Time
♦ Low 5.5mA Operating Supply Current
♦ 1.25µA Low-Current Power-Down Mode for
Efficient Power Cycling
♦ 250MHz to 500MHz Operating Band (Image
Rejection Optimized at 315MHz)
♦ Integrated PLL with On-Board Voltage-Controlled
Oscillator (VCO) and Loop Filter
♦ Selectable IF Bandwidth Through External Filter
♦ Complete Receive System from RF to Digital Data
Out
MAX1470
315MHz Low-Power, +3V Superheterodyne
Receiver
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-2135; Rev 1; 8/02
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.
PART TEMP RANGE PIN-PACKAGE
MAX1470EUI -40°C to +85°C 28 TSSOP
Functional Diagram
LNA
LNAOUT
6
MIXIN1 MIXIN2
0°
90°
IFIN1MIXOUT IFIN2
181712
RSSI
R
DF1
100kΩ
R
DF2
100kΩ
DIVIDE
BY 64
VCO
LOOP
FILTER
PHASE
DETECTOR
CRYSTAL
DRIVER
SHUTDOWN
89
4
IF
LIMITING
AMPS
22212619202527281
DFOPPPDOUTDSPDSNDATAOUTPWRDNXTAL1 XTAL2
5,10
13
2,7
14
AGND
DGND
DV
DD
AV
DD
LNASRC
LNAIN
DATA
SLICER
DATA
FILTER
3
Q
I
MAX1470
PEAK
DETECTOR
Typical Application Circuit appears at end of data sheet.
Pin Configuration appears at end of data sheet.
*See Note 2, AC Electrical Characteristics.
MAX1470
315MHz Low-Power, +3V Superheterodyne
Receiver
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(Typical Application Circuit, V
DD
= +3.0V to +3.6V, no RF signal applied, T
A
= -40°C to +85°C. Typical values are at V
DD
= +3.3V, T
A
= +25°C, unless otherwise noted.) (Note 1)
AC ELECTRICAL CHARACTERISTICS
(Typical Application Circuit, all RF inputs and outputs are referenced to 50Ω, V
DD
= +3.3V, T
A
= +25°C, f
RFIN
= 315MHz, unless oth-
erwise noted.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
AV
DD
to AGND ......................................................-0.3V to +4.0V
DV
DD
to DGND......................................................-0.3V to +4.0V
All Other Pins Referenced to AGND...........-0.3V to (V
DD
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
28-Pin TSSOP (derate 13mW/°C above +70°C) .........1039mW
Operating Temperature Range
MAX1470EUI ...................................................-40°C to +85°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage V
DD
3.0 3.6 V
Supply Current I
DD
PWRDN = V
DD
5.5 mA
Shutdown Supply Current I
SHUTDOWN
PWRDN = GND 1.25 µA
PWRDN Voltage Input Low V
IL
0.4 V
PWRDN Voltage Input High V
IH
V
DD
-
0.4
V
DATAOUT Voltage Output Low V
OL
I
DATAOUT
= 100µA 0.4 V
DATAOUT Voltage Output High V
OH
I
DATAOUT
= -100µA
V
DD
-
0.4
V
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
GENERAL CHARACTERISTICS
Maximum Startup Time T
ON
Time from PWRDN deasserting to valid data
out
250 µs
Maximum Receiver Input Level RFIN
MAX
Modulation depth ≥ 60dB 0 dBm
Average carrier power level (Note 2) -115
Minimum Receiver Input Level,
315MHz
RFIN
MIN
Peak power level (Note 2) -109
dBm
Average carrier power level (Note 2) -110
Minimum Receiver Input Level,
433.92MHz
Peak power level (Note 2) -104
dBm
Receivers f
RFIN
250 to 500 MHz
LOW-NOISE AMPLIFIER (LNA)
Input Impedance S11
LNA
Normalized to 50Ω (Note 3) 1 - j4
1dB Compression Point P1dB
LNA
-22 dBm
Input-Referred 3rd-Order
Intercept
IIP3
LNA
-18 dBm
LO Signal Feedthrough to
Antenna
-95 dBm
Output Impedance S22
LNA
Normalized to 50Ω
0.12 -
j4.4
MAX1470
315MHz Low-Power, +3V Superheterodyne
Receiver
_______________________________________________________________________________________ 3
AC ELECTRICAL CHARACTERISTICS (continued)
(Typical Application Circuit, all RF inputs and outputs are referenced to 50Ω, V
DD
= +3.3V, T
A
= +25°C, f
RFIN
= 315MHz, unless oth-
erwise noted.) (Note 1)
Note 1: Parts are production tested at T
A
= +25°C; Min and Max values are guaranteed by design and characterization.
Note 2: BER = 2E-3, Manchester encoded, data rate = 4kbps, IF bandwidth = 350kHz.
Note 3: Input impedance is measured at the LNAIN pin. Note that the impedance includes the 15nH inductive degeneration con-
nected from the LNASRC.
Note 4: Guaranteed by production test.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Noise Figure NF
LNA
2.0 dB
Power Gain 16 dB
MIXER
Input Impedance S11
MIX
Normalized to 50Ω
0.25 -
j2.4
Input-Referred 3rd-Order
Intercept
IIP3
MIX
-18 dBm
Output Impedance Z
OUT
_
MIX
330 Ω
f
RFIN
= 315M H z, f
RF
_
IM AGE
= 293.6M H z ( N ote 4) 40 53
Image Rejection
f
RFIN
= 433.92M H z, f
RF
_
IM AGE
= 412.52M H z39
dB
Noise Figure NF
MIX
16 dB
Conversion Gain 330Ω IF filter load 13 dB
INTERMEDIATE-FREQUENCY DEMODULATOR BLOCK
Input Impedance Z
IN
_
IF
330 Ω
Operating Frequency f
IF
10.7 MHz
RSSI Linearity ±1dB
RSSI Dynamic Range 65 dB
P
RFIN
< -120dBm 1.2
RSSI Level
P
RFIN
> -50dBm 2.0
V
DATA FILTER
Maximum Bandwidth BW
DF
100 kHz
DATA SLICER
Comparator Bandwidth BW
CMP
100 kHz
Maximum Load Capacitance C
LOAD
10 pF
CRYSTAL OSCILLATOR
Reference Frequency f
REF
4.7547 MHz
P1-P3P4-P6P7-P9P10-P12

MAX1470EUI+

Mfr. #:
Buy MAX1470EUI+
Manufacturer:
Maxim Integrated
Description:
RF Receiver 315MHz Low-Power 3V Superheterodyne Rcvr
Lifecycle:
New from this manufacturer.
Delivery:
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