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MICRF003 / 033

QwikRadio

900 MHz UHF Receiver

Preliminary Information

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.

In FIXED mode, the device functions like a conventional

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. Thus the MICRF003 can operate with less

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

0.5% ceramic

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.

Features

•

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

100:1

Wakeup

Function to Enable External Decoders and

Microprocessors

Very low RF re-radiation at the antenna

CMOS logic interface to standard decoder and

microprocessor ICs

Extremely low external part count

Applications

•

Automotive Remote Keyless Entry

Security Systems

Low Rate Data Modems

Remote Meter Data Collection

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

QwikRadio

Micrel

Ordering Information

Part Number

MICRF003BM

MICRF033BM

Temperature Range

-40°C to +105°C

Package

16-Pin SOIC

8-Pin SOIC

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.

Contact the factory for details.

Pin Configuration (SOIC)

October 1999

MICRF003

MICRF003

QwikRadio

Micrel

Pin Description

(Pin numbers for the 8-pin version are identified in parentheses)

Pin Number

2/3

Pin Name

SEL0

VSSRF

Pin Function

This pin, in conjunction with SEL1, programs the desired Demodulator Filter Bandwidth. This pin is internally

pulled-up to VDDRF. See Table 1.

This pin is the ground return for the RF section of the IC. The bypass capacitor connected from VDDRF to

VSSRF should have the shortest possible lead length. For best performance, connect VSSRF to VSSBB at the

power supply only (i.e., keep VSSBB currents from flowing through VSSRF return path).

This pin is the ground return for the IC. The bypass capacitor connected from VDDRF to VSSRF should have

the shortest possible lead length.

This is the receive RF input, internally ac-coupled. Connect this pin to the receive antenna. Input impedance is

high (FET gate) with approximately 2pF of shunt (parasitic) capacitance. For applications located in high

ambient noise environments, a fixed value band-pass network may be connected between the ANT pin and

VSSRF to provide additional receive selectivity and input overload protection. (See

“Application Note TBD”.)

This pin is the positive supply input for the RF section of the IC. VDDBB and VDDRF should be connected

directly at the IC pins. Connect a low ESL, low ESR decoupling capacitor from this pin to VSSRF, as short as

possible.

This pin is the positive supply input for the baseband section of the IC. VDDBB and VDDRF should be

connected directly at the IC pins.

This pin is the positive supply input for the IC. Connect a low ESL, low ESR decoupling capacitor from this pin

to VSSRF, as short as possible.

This capacitor extracts the (DC) average value from the demodulated waveform, which becomes the reference

for the internal data slicing comparator. Treat this as a low-pass RC filter with source impedance of nominally

90kohms ( for REFOSC frequency Ft = 6.75MHz, see

“Application Note TBD”).

A standard

20% X7R

ceramic capacitor is generally sufficient.

Unused Pin

This is the ground return for the baseband section of the IC. The bypass and output capacitors connected to

VSSBB should have the shortest possible lead lengths. For best performance, connect VSSRF to VSSBB at

the power supply only (i.e., keep VSSBB currents from flowing through VSSRF return path).

The output data signal. CMOS level compatible.

A logic input for Shutdown Mode control. Pull this pin low to place the IC into operation. This pin in internally

pulled-up to VDDRF.

An output signal, active low when the IC detects an incoming RF signal, determined by monitoring for data

preamble. CMOS level compatible.

Integrating capacitor for on-chip AGC (Automatic Gain Control). The Decay/Attack time-constant (TC) ratio is

nominally set as 10:1. Use of 0.47uF or greater is strongly recommended for best range performance. Use

low-leakage type capacitors for duty-cycle operation (Dip Tantalum, Ceramic, Polyester). (See

“Application Note

TBD.)

This pin, in conjunction with SEL0, programs the desired Demodulator Filter Bandwidth. This pin in internally

pulled-up to VDDRF. See Table 1.

This is the timing reference for on-chip tuning and alignment. Connect either a ceramic resonator or crystal

(mode dependent) between this pin and VSSBB, or drive the input with an AC coupled 0.5Vpp input clock. Use

ceramic resonators without integral capacitors. Note that if operating in FIXED mode, a crystal must be used;

however in SWP mode, one may use either a crystal or ceramic resonator. See

“Application Note TBD”

for

details on frequency selection and accuracy.

This logic pin controls the operating mode of the MICRF003. When SWEN = HIGH, the MICRF003 is in SWP

mode. When SWEN = LOW, the device operates as a conventional single-conversion superheterodyne

receiver. (See

“Application Note TBD”

for details.) This pin is internally pulled-up to VDDRF.

(1)

(2)

VSSRF

ANT

VDDRF

(3)

(4)

VDDBB

VDDRF

CTH

N/C

VSSBB

(5)

(6)

(7)

SHUT

WAKEB

CAGC

(8)

SEL1

REFOSC

SWEN

SEL0

SEL1

SWP Mode

6000

3000

1500

750

Demodulator Bandwidth (Hz)

FIXED Mode

22400

11200

5600

2800

Table 1

Nominal Demodulator (Baseband) Filter Bandwidth

vs. SEL0, SEL1 and Mode

October 1999

MICRF003

MICRF003

QwikRadio

Micrel

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......................-65°C to + 150°C

Lead Temperature (soldering, 10 seconds)..............+ 260°C

Operating Ratings

Supply Voltage (VDDRF, VDDBB)....................4.75V to

5.5V

Ambient Operating Temperature (TA)..........-40°C to

+105°C

Package Thermal Resistance

θja

(8 Pin SOIC).....120°C/W

Package Thermal Resistance

θja

(16 Pin SOIC).....120°C/W

Electrical Characteristics

Unless otherwise stated, these specifications apply for Ta = -40°C to 105°C, 4.75<VDD<5.5V. All voltages are with respect

to Ground; Positive currents flow into device pins. CAGC = 4.7µF, CTH = .047µF, VDDRF = VDDBB = VDD. REFOSC

frequency = 6.75MHz.

Parameter

Power Supply

Operating Current

Standby Current

RF/IF Section

Receiver Sensitivity

IF Center Frequency

IF 3dB Bandwidth

Receive Data Rate

RF Input Range

Receive Modulation Duty-Cycle

Maximum Receiver Input

Spurious Reverse Isolation

AGC Attack / Decay ratio

AGC Leakage Current

Local Oscillator Stabilization Time

Demod Section

CTH Source Impedance

CTH Source Impedance Variation

CTH Leakage Current

Demod Filter Bandwidth

Digital/Control Section

REFOSC Input Impedance

Input Pullup Current

Input High Voltage

Input Low Voltage

Output Current

Output High Voltage

Output Low Voltage

Output Tr, Tf

Test Conditions

MIN

TYP

MAX

UNITS

µA

10:1 Duty Cycle

SHUT = VDD

Note 1, 3

Note 4

Note 3, 4

FIXED Mode, Manchester Encoded Data

SWP Mode, Manchester Encoded Data

800

Rs = 50Ω

ANT pin, Rs = 50Ω Note 2

T(Attack) / T(Decay)

Ta = 85°C

To 1% of Final Value

Note 5

-15

Ta = 85°C

SEL0 = SEL1 = SWEN = VDD, Note 4, 6

SEL0 = SEL1 = VDD, SWEN = VSS,

Note 4, 6

400

-95

2.37

1.18

1000

-20

0.1

±200

2.5

90k

+15

±200

5730

21500

µA

dBm

MHz

kbps

MHz

dBm

µVrms

msec

Ω

200k

SEL0, SEL1, SWEN, SHUT=VSS

SEL0, SEL1, SWEN

DO, WAKEUP pins, Push-Pull

DO, WAKEUP pins, Iout = -1µA

DO. WAKEUP pins, Iout = +1µA

DO, WAKEUP pins, Cload=15pF

0.9VDD

0.1VDD

0.2VDD

0.8VDD

Ω

µA

µsec

October 1999

MICRF003