19-3704; Rev 2; 1/12
ATION
EVALU
AVAIL
KIT
ABLE
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 TQFN and is
specified over the automotive -40°C to +125°C tem-
perature range.
Features
o +2.4V to +3.6V or +4.5V to +5.5V Single-Supply
Operation
o Four User-Selectable Carrier Frequencies
308, 315, 418, and 433.92MHz
o -110dBm RF Input Sensitivity at 315MHz
o -109dBm RF Input Sensitivity at 433.92MHz
o Fast Startup (< 250 μ s)
o Small 32-Pin TQFN Package
o Low Operating Supply Current
6.2mA Continuous
20nA Power-Down
o Integrated PLL, VCO, and Loop Filter
o 45dB Integrated Image Rejection
o Selectable IF BW with External Filter
o Positive and Negative Peak Detectors
o RSSI Output
Ordering Information
Applications
PART
MAX7042ATJ+
TEMP RANGE
-40°C TO +125°C
PIN-PACKAGE
32 TQFN-EP*
Remote Keyless Entry
Tire-Pressure Monitoring
Home and Office Lighting Control
Remote Sensing
Smoke Alarms
Home Automation
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Pin Configuration
TOP VIEW
Local Telemetry Systems
24
23
22
21
20
19
18
17
Security Systems
N.C.
EN
FSEL1
FSEL2
25
26
27
28
16
15
14
13
IFIN+
IFIN-
AGND
MIXOUT
HVIN
DATA
LNASEL
N.C.
29
30
31
32
EP
MAX7042
12
11
10
9
MIXIN-
MIXIN+
LNAOUT
LNASRC
+
1
2
3
4
5
6
7
8
Typical Application Circuit appears at end of data sheet.
TQFN
________________________________________________________________ Maxim Integrated Products
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.
1
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