19-3704; Rev 1; 3/07
308MHz/315MHz/418MHz/433.92MHz
Low-Power, FSK Superheterodyne Receiver
General Description
The MAX7042 fully integrated, low-power, CMOS
superheterodyne RF receiver is designed to receive
frequency-shift-keyed (FSK) data at rates up to 66kbps
nonreturn-to-zero (NRZ) (33kbps Manchester). The
MAX7042 requires only a few external components to
realize a complete wireless RF receiver at 308, 315,
418, and 433.92MHz.
The MAX7042 includes all the active components
required in a superheterodyne receiver including a low-
noise amplifier (LNA), an image-rejection (IR) mixer, a
fully integrated phase-locked loop (PLL), local oscillator
(LO), 10.7MHz IF limiting amplifier with received-signal-
strength indicator (RSSI), low-noise FM demodulator,
and a 3V regulator. Differential peak-detecting data
demodulators are included for baseband data recovery.
The MAX7042 is available in a 32-pin thin QFN and
is specified over the automotive -40°C to +125°C
temperature range.
Features
♦
+2.4V to +3.6V or +4.5V to +5.5V Single-Supply
Operation
♦
Four User-Selectable Carrier Frequencies
308, 315, 418, and 433.92MHz
♦
-110dBm RF Input Sensitivity at 315MHz
♦
-109dBm RF Input Sensitivity at 433.92MHz
♦
Fast Startup (< 250µs)
♦
Small 32-Pin Thin QFN Package
♦
Low Operating Supply Current
6.2mA Continuous
20nA Power-Down
♦
Integrated PLL, VCO, and Loop Filter
♦
45dB Integrated Image Rejection
♦
Selectable IF BW with External Filter
♦
Positive and Negative Peak Detectors
♦
RSSI Output
MAX7042
Ordering Information
PART
MAX7042ATJ+
MAX7042AAX+**
TEMP RANGE PIN-PACKAGE
-40°C TO
+125°C
-40°C TO
+125°C
32 Thin QFN-EP*
36 SSOP
PKG
CODE
T3255-3
A36-2
Applications
Remote Keyless Entry
Tire-Pressure Monitoring
Home and Office Lighting Control
Remote Sensing
Smoke Alarms
Home Automation
Local Telemetry Systems
Security Systems
+Denotes
a lead-free package.
*EP
= Exposed paddle.
**Future
product—contact factory for availability.
Pin Configuration
PDMAX
DGND
DV
DD
OP+
DS+
TOP VIEW
24
N.C.
EN
FSEL1
FSEL2
HV
IN
DATA
LNASEL
N.C.
23
22
21
20
19
DS-
DF
18
17
16
15
14
13
IFIN+
IFIN-
AGND
MIXOUT
MIXIN-
MIXIN+
LNAOUT
LNASRC
25
26
27
28
29
30
31
32
+
1
N.C.
MAX7042
PDMIN
12
11
10
9
2
N.C.
3
N.C.
4
RSSI
5
XTAL2
6
XTAL1
7
AV
DD
8
LNAIN
Typical Application Circuit appears at end of data sheet.
THIN QFN
________________________________________________________________
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.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
