Rainbow Electronics MAX7030 - Manual

General Description
The MAX7030 crystal-based, fractional-N transceiver is
designed to transmit and receive ASK/OOK data at fac-
tory-preset carrier frequencies of 315MHz, 345MHz
†
, or
433.92MHz with data rates up to 33kbps (Manchester
encoded) or 66kbps (NRZ encoded). This device gen-
erates a typical output power of +10dBm into a 50
Ω
load, and exhibits typical sensitivity of -114dBm. The
MAX7030 features separate transmit and receive pins
(PAOUT and LNAIN) and provides an internal RF switch
that can be used to connect the transmit and receive
pins to a common antenna.
The MAX7030 transmit frequency is generated by a 16-
bit, fractional-N, phase-locked loop (PLL), while the
receiver’s local oscillator (LO) is generated by an inte-
ger-N PLL. This hybrid architecture eliminates the need
for separate transmit and receive crystal reference
oscillators because the fractional-N PLL is preset to be
10.7MHz above the receive LO. Retaining the fixed-N
PLL for the receiver avoids the higher current-drain
requirements of a fractional-N PLL and keeps the
receiver current drain as low as possible. All frequency-
generation components are integrated on-chip, and
only a crystal, a 10.7MHz IF filter, and a few discrete
components are required to implement a complete
antenna/digital data solution.
The MAX7030 is available in a small, 5mm x 5mm, 32-
pin thin QFN package, and is specified to operate over
the automotive -40°C to +125°C temperature range.
†Consult factory for availability.
Applications
2-Way Remote Keyless Entry
Security Systems
Home Automation
Remote Controls
Remote Sensing
Smoke Alarms
Garage Door Openers
Local Telemetry Systems
Features
♦ +2.1V to +3.6V or +4.5V to +5.5V Single-Supply
Operation
♦ Single-Crystal Transceiver
♦ Factory-Preset Frequency (No Serial Interface
Required)
♦ ASK/OOK Modulation
♦ +10dBm Output Power into 50Ω Load
♦ Integrated TX/RX Switch
♦ Integrated Transmit and Receive PLL, VCO, and
Loop Filter
♦ > 45dB Image Rejection
♦ Typical RF Sensitivity*: -114dBm
♦ Selectable IF Bandwidth with External Filter
♦ < 12.5mA Transmit-Mode Current
♦ < 6.7mA Receive-Mode Current
♦ < 800nA Shutdown Current
♦ Fast-On Startup Feature, <250µs
♦ Small, 32-Pin, Thin QFN Package
MAX7030
Low-Cost, 315MHz, 345MHz, and 433.92MHz
ASK Transceiver with Fractional-N PLL
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-3706; 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.
PART TEMP RANGE PIN-PACKAGE
PKG
CODE
MAX7030_ATJ -40 °C to +125°C 32 Thin QFN-EP** T3255-3
Product Selector Guide
PART CARRIER FREQUENCY (MHz)
MAX7030LATJ 315
MAX7030MATJ 345
MAX7030HATJ 433.92
*0.2% BER, 4kbps Manchester-encoded data, 280kHz IF BW
**EP = Exposed paddle.
Note: The MAX7030 is available with factory-preset operating
frequencies. See the Product Selector Guide for complete part
numbers.
Pin Configuration, Typical Application Circuit, and
Functional Diagram appear at end of data sheet.