MAX7042 Datasheet, PDF (1/18 Pages) Maxim Integrated Products – 308MHz/315MHz/418MHz/433.92MHz Low-Power, FSK Superheterodyne Receiver

19-3704; Rev 0; 5/05
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
Applications
Remote Keyless Entry
Tire-Pressure Monitoring
Home and Office Lighting Control
Remote Sensing
Smoke Alarms
Home Automation
Local Telemetry Systems
Security Systems
Ordering Information
PART
TEMP
RANGE
MAX7042ATJ
-40°C to
+125°C
*EP = Exposed pad.
PIN-PACKAGE PKG CODE
32 Thin QFN-EP* 13255-3
Pin Configuration
TOP VIEW
24 23 22 21 20 19 18 17
N.C. 25
EN 26
FSEL1 27
FSEL2 28
HV_IN 29
DATA 30
LNASEL 31
N.C. 32
MAX7042
16 IFIN+
15 IFIN-
14 AGND
13 MIXOUT
12 MIXIN-
11 MIXIN+
10 LNAOUT
9 LNASRC
Typical Application Circuit appears at end of data sheet.
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THIN QFN
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