MICRF033BM Micrel Inc, MICRF033BM Datasheet

MICRF033BM

Manufacturer Part Number

MICRF033BM

Description

Manufacturer

Micrel Inc

Datasheet

1.MICRF033BM.pdf (16 pages)

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Typical Operating Circuit

General Description

The MICRF003 is a single chip OOK (ON-OFF Keyed) Receiver IC for

remote wireless applications, employing Micrel’s latest QwikRadio

technology. This device is a true “antenna-in, data-out” monolithic device. All

RF and IF tuning is accomplished automatically within the IC, which

eliminates manual tuning, and reduces production costs. Receiver functions

are completely integrated. The result is a highly reliable yet extremely low

cost solution for high volume wireless applications. Because the MICRF003

is a true single-chip radio receiver, it is extremely easy to apply, minimizing

design and production costs, and improving time to market.

The MICRF003 provides two fundamental modes of operation, FIXED and

SWP.

Superheterodyne receiver, with an (internal) local oscillator fixed at a single

frequency based on an external reference crystal or clock. As with any

conventional superheterodyne receiver, the transmit frequency must be

accurately controlled, generally with a crystal or SAW (Surface Acoustic

Wave) resonator.

In SWP mode, the MICRF003 sweeps the (internal) local oscillator at rates

greater than the baseband data rate. This effectively “broadens” the RF

bandwidth of the receiver to a value equivalent to conventional super-

regenerative receivers.

expensive LC transmitters without additional components or tuning, even

though the receiver topology is still superheterodyne. In this mode the

reference crystal can be replaced with a less expensive

resonator.

The MICRF003 provides two additional key features: (1) a Shutdown Mode,

which may be used for duty-cycle operation, and (2) a “Wakeup” function,

which provides a logical indication of an incoming RF signal. These features

make the MICRF003 ideal for low and ultra-low power applications, such as

RKE and RFID.

All post-detection (demodulator) data filtering is provided on the MICRF003,

so no external filters need to be designed. Any one of four filter bandwidths

may be selected externally by the user. Nominal filter bandwidths range in

binary steps, from 0.75kHz to 6kHz (SWP mode) or 2.8kHz to 22.4kHz

(FIXED mode). The user only needs to program the appropriate filter

selection based on data rate and code modulation format.

915 MHz, 2400 bps OOK

ISM Band RECEIVER

Micrel Inc. • 1849 Fortune Drive San Jose, Ca 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

In FIXED mode, the device functions like a conventional

Thus the MICRF003 can operate with less

0.5% ceramic

Features

100:1

Microprocessors

microprocessor ICs

Applications

Complete 900 MHz Band receiver on a monolithic IC

UHF Frequency range 800 to 1000 MHz

Typical range over 170 meters with monopole antenna

Data rates to 5kbps (SWP), 20kbps (FIXED)

Automatic tuning, no manual adjustment

No Filters or Inductors required

Low Operating Supply Current--4mA @ 868MHz

Shutdown Mode for Duty-Cycle Operation in excess of

Wakeup Function to Enable External Decoders and

Very low RF re-radiation at the antenna

CMOS logic interface to standard decoder and

Extremely low external part count

Automotive Remote Keyless Entry

Security Systems

Low Rate Data Modems

Remote Meter Data Collection

QwikRadio

Preliminary Information

MICRF003 / 033

900 MHz UHF Receiver

Related parts for MICRF033BM

MICRF033BM Summary of contents

Page 1

... Typical Operating Circuit 915 MHz, 2400 bps OOK ISM Band RECEIVER Micrel Inc. • 1849 Fortune Drive San Jose, Ca 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com MICRF003 / 033 QwikRadio Preliminary Information ...

Page 2

... Ordering Information Part Number MICRF003BM MICRF033BM The standard 16-pin package provides the user with complete control of MICRF002 mode and filter selection. An 8-pin standard part is also available for very low cost applications. The 8-pin version comes pre-programmed in SWP mode, with Demodulator Filter bandwidth set to 5000Hz, and SHUT pin externally available. Other 8-pin configurations are available. ...

Page 3

MICRF003 Pin Description (Pin numbers for the 8-pin version are identified in parentheses) Pin Number Pin Name Pin Function 1 SEL0 This pin, in conjunction with SEL1, programs the desired Demodulator Filter Bandwidth. This pin is internally pulled-up to VDDRF. ...

Page 4

MICRF003 ABSOLUTE MAXIMUM RATINGS Supply Voltage (VDDRF, VDDBB)..................................+7V Voltage on any I/O Pin.........................VSS-0.3 to VDD+0.3 Junction Temperature...............................................+150 C Storage Temperature Range......................- 150 C Lead Temperature (soldering, 10 seconds)..............+ 260 C Electrical Characteristics Unless otherwise stated, these specifications ...

Page 5

MICRF003 Note 1: Sensitivity is defined as the average signal level measured at the input necessary to achieve 10e-2 Bit Error Rate (BER). The input signal is defined as a return-to-zero (RZ) waveform with 50% average duty cycle (e.g., Manchester ...

Page 6

MICRF003 6.00 5.50 5.00 4.50 I (mA) DD 4.00 3.50 3.00 800 7.00 6.50 6.00 5.50 5.00 I (mA) DD 4.50 4.00 3.50 3.00 2.50 -40 October 1999 tm QwikRadio Typical Performance Characteristics MICRF003 I vs Frequency DD (Temperature=25 C, ...

Page 7

MICRF003 MICRF003 Block Diagram October 1999 tm QwikRadio 7 Micrel MICRF003 ...

Page 8

MICRF003 Functional Description Please refer to “MICRF003 Block Diagram”. Identified in the block diagram are the four principal functional blocks of the IC, namely (1) UHF Downconverter, (2) OOK Demodulator, (3) Reference and Control, and (4) Wakeup. Also shown in ...

Page 9

MICRF003 The signal path has automatic gain control (AGC) to increase input dynamic range. CAGC, must be connected to the CAGC pin of the device. The ratio of decay-to-attack time-constant is fixed at 10:1 (i.e., the attack time constant is ...

Page 10

MICRF003 1. Selecting REFOSC Frequency Ft (FIXED Mode) As with any superheterodyne receiver, the difference between the (internal) Local Oscillator (LO) frequency Flo and the incoming Transmit frequency Ftx must ideally equal the IF Center frequency. Equation (1) may be ...

Page 11

MICRF003 I/O Pin Interface Circuitry Interface circuitry for the various I/O pins of the MICRF003 is shown in Figures 1 through 6. regarding each of these circuits is discussed in the following sub-paragraphs. Not shown are ESD protection diodes which ...

Page 12

MICRF003 Figure 2 CTH Pin Figure 4 DO and WAKEB Pins Figure 6a SEL0, SEL1, SWEN October 1999 tm QwikRadio Figure 3 CAGC Pin Figure 5 REFOSC Pin Figure 6b SHUT 12 Micrel MICRF003 ...

Page 13

MICRF003 Typical Application Figure 7 below illustrates a typical application for the MICRF003 UHF Receiver IC. Operation in this example is at 915MHz, and may be customized by selection of the appropriate reference frequency (CR1), and adjustment of the antenna ...

Page 14

MICRF003 October1999 tm QwikRadio 14 Micrel MICRF003 ...

Page 15

MICRF003 October1999 tm QwikRadio 15 Micrel MICRF003 ...

Page 16

... This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. This is preliminary information and a final specification has not been completed. Before making any final design determination, consult with Micrel for final specifications. ...

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