MAX7042ATJ+T Maxim Integrated Products, MAX7042ATJ+T Datasheet

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MAX7042ATJ+T

Manufacturer Part Number
MAX7042ATJ+T
Description
RF Receiver IC RECEIVER FSK -433.92MHz Low-Power
Manufacturer
Maxim Integrated Products
Type
Receiverr
Datasheet

Specifications of MAX7042ATJ+T

Package / Case
TQFN-32 EP
Operating Frequency
433.92 MHz
Operating Supply Voltage
2.5 V, 3.3 V, 5 V
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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.
19-3704; Rev 1; 3/07
Typical Application Circuit appears at end of data sheet.
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.
Remote Keyless Entry
Tire-Pressure Monitoring
Home and Office Lighting Control
Remote Sensing
Smoke Alarms
Home Automation
Local Telemetry Systems
Security Systems
Low-Power, FSK Superheterodyne Receiver
________________________________________________________________ Maxim Integrated Products
General Description
308MHz/315MHz/418MHz/433.92MHz
Applications
♦ +2.4V to +3.6V or +4.5V to +5.5V Single-Supply
♦ Four User-Selectable Carrier Frequencies
♦ -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
♦ Integrated PLL, VCO, and Loop Filter
♦ 45dB Integrated Image Rejection
♦ Selectable IF BW with External Filter
♦ Positive and Negative Peak Detectors
♦ RSSI Output
+Denotes a lead-free package.
*EP = Exposed paddle.
**Future product—contact factory for availability.
MAX7042ATJ+
MAX7042AAX+**
Operation
308, 315, 418, and 433.92MHz
TOP VIEW
6.2mA Continuous
20nA Power-Down
LNASEL
PART
FSEL1
FSEL2
DATA
HV
N.C.
N.C.
EN
IN
25
26
27
28
29
30
31
32
+
24
1
TEMP RANGE PIN-PACKAGE
23
2
-40°C TO
-40°C TO
+125°C
+125°C
Ordering Information
22
3
THIN QFN
MAX7042
21
4
Pin Configuration
20
5
32 Thin QFN-EP*
19
6
36 SSOP
18
7
8
17
Features
16
15
14
13
12
11
10
9
IFIN+
IFIN-
AGND
MIXOUT
MIXIN-
MIXIN+
LNAOUT
LNASRC
T3255-3
CODE
A36-2
PKG
1

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MAX7042ATJ+T Summary of contents

Page 1

... Home Automation Local Telemetry Systems Security Systems Typical Application Circuit appears at end of data sheet. ________________________________________________________________ Maxim Integrated Products 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. ♦ +2.4V to +3.6V or +4.5V to +5.5V Single-Supply Operation ♦ ...

Page 2

Low-Power, FSK Superheterodyne Receiver ABSOLUTE MAXIMUM RATINGS AGND or DGND .......................................-0.3V to +6. AGND or DGND..........................-0.3V to +4.0V FSEL1, FSEL2, LNASEL, EN, DATA...............................(DGND - 0.3V 0.3V) ...

Page 3

Low-Power, FSK Superheterodyne Receiver DC ELECTRICAL CHARACTERISTICS (continued) (Typical Application Circuit, 50Ω system impedance -40°C to +125°C, unless otherwise noted. Typical values are ≤ -80dBm +25°C, unless otherwise noted.) RFIN ...

Page 4

Low-Power, FSK Superheterodyne Receiver AC ELECTRICAL CHARACTERISTICS (continued) (Typical Application Circuit, 50Ω system impedance -40°C to +125°C, unless otherwise noted. Typical values are ≤ -80dBm +25°C, unless otherwise noted.) RFIN ...

Page 5

Low-Power, FSK Superheterodyne Receiver (Typical Application Circuit 3.0V deviation = ±50kHz, BER = 0.2 +25°C, unless otherwise noted.) A SUPPLY CURRENT vs. RF FREQUENCY ( LNA 7.5 +125°C 7.3 7.1 +85°C ...

Page 6

Low-Power, FSK Superheterodyne Receiver (Typical Application Circuit 3.0V deviation = ±50kHz, BER = 0.2 +25°C, unless otherwise noted.) A SYSTEM GAIN vs. IF FREQUENCY ( LNA 50 40 UPPER SIDEBAND FROM ...

Page 7

Low-Power, FSK Superheterodyne Receiver (Typical Application Circuit 3.0V deviation = ±50kHz, BER = 0.2 +25°C, unless otherwise noted.) A S11 SMITH PLOT OF R 433.92MHz INPUT IMPEDANCE vs. INDUCTIVE DEGENERATION ...

Page 8

Low-Power, FSK Superheterodyne Receiver PIN NAME 1, 2 N.C. No Connection. Internally pulled down. 3, 25, 32 N.C. No Connection. Not internally connected. 4 RSSI Buffered Received-Signal-Strength-Indicator Output 5 XTAL2 Crystal Input 2. XTAL2 can be driven from an ...

Page 9

Low-Power, FSK Superheterodyne Receiver LNAOUT 10 LNA LNAIN 8 9 LNASRC AGND 14 XTAL1 6 DIVIDE- BY-32 XTAL2 5 PHASE DETECTOR 26 EN EXPOSED MAX7042 PADDLE DGND 3. REG 3. ...

Page 10

Low-Power, FSK Superheterodyne Receiver Detailed Description The MAX7042 CMOS superheterodyne receiver and a few external components provide a complete FSK receive chain from the antenna to the digital output data. FSK uses the difference in frequency of the carri- ...

Page 11

Low-Power, FSK Superheterodyne Receiver IF LIMITING AMPS Figure 1. FSK Demodulator PLL Block Diagram A unique feature of the MAX7042 is the integrated image rejection of the mixer. This device is designed to elimi- nate the need for a ...

Page 12

Low-Power, FSK Superheterodyne Receiver Crystal Oscillator The XTAL oscillator in the MAX7042 is used to generate the LO for mixing with the received signal. The XTAL oscil- lator frequency sets the received signal frequency as ...

Page 13

Low-Power, FSK Superheterodyne Receiver The data filter is implemented as a 2nd-order lowpass Sallen-Key filter. The pole locations are set by the com- bination of two on-chip resistors and two external capacitors. Adjusting the value of the external capaci- ...

Page 14

Low-Power, FSK Superheterodyne Receiver Numerous configurations can be used to generate the data-slicer threshold. For example, the circuit in Figure 3 shows a simple method using only one resistor and one capacitor. This configuration averages the analog out- put ...

Page 15

Low-Power, FSK Superheterodyne Receiver Layout Considerations A properly designed PCB is an essential part of any RF/microwave circuit. On high-frequency inputs and outputs, use controlled-impedance lines and keep them as short as possible to minimize losses and radia- tion. ...

Page 16

Low-Power, FSK Superheterodyne Receiver Table 3. Component Values for Typical Application Circuit COMPONENT C10 C11 C12 C13 C14 C15 C16 10.7MHz ceramic filter 16 ...

Page 17

Low-Power, FSK Superheterodyne Receiver (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) ______________________________________________________________________________________ Package Information 17 ...

Page 18

Low-Power, FSK Superheterodyne Receiver (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) 18 ______________________________________________________________________________________ Package Information (continued) ...

Page 19

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 19 © 2007 Maxim Integrated Products ...

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