Rainbow Electronics MAX7042 - Manual

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.
Applications
Remote Keyless Entry
Tire-Pressure Monitoring
Home and Office Lighting Control
Remote Sensing
Smoke Alarms
Home Automation
Local Telemetry Systems
Security Systems
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
308MHz/315MHz/418MHz/433.92MHz
Low-Power, FSK Superheterodyne Receiver
________________________________________________________________ Maxim Integrated Products 1
24 23 22 21 20 19 18
1 2 3 4 5 6 7
10
11
12
13
14
15
16
31
30
29
28
27
26
25
MAX7042
THIN QFN
TOP VIEW
EN
N.C.
FSEL1
FSEL2
HV IN
DATA
LNASEL
32 N.C.
N.C. N.C. N.C. RSSI
XT
AL2
XT
AL1
AV
DD
LNAIN
DV
DD
DGND DF OP+ DS+ DS- PDMAX
17
PDMIN
IFIN+
IFIN-
AGND
MIXOUT
MIXIN-
MIXIN+
LNAOUT
9 LNASRC
8
Pin Configuration
Ordering Information
19-3704; Rev 0; 5/05
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.
*EP = Exposed pad.
PART
TEMP
RANGE
PIN-PACKAGE PKG CODE
MAX7042ATJ
-40°C to
+125°C
32 Thin QFN-EP* 13255-3
Typical Application Circuit appears at end of data sheet.