MICRF103BM Datasheet MICRF103BM, MICRF103BM TR | P1-P3

June 2002 1 MICRF103

MICRF103 Micrel

MICRF103

QwikRadio™ UHF ASK Transmitter

Final

General Description

The MICRF103 is a single chip Transmitter IC for remote

wireless applications. The device employs Micrel’s latest

QwikRadio™ technology. This device is a true ”data-in,

antenna-out” monolithic device. All antenna tuning is accom-

plished automatically within the IC which eliminates manual

tuning, and reduces production costs. The result is a highly

reliable yet extremely low cost solution for high volume

wireless applications. Because the MICRF103 is a true

single-chip radio transmitter, it is easy to apply, minimizing

design and production costs, and improving time to market.

The MICRF103 uses a novel architecture where the external

antenna is tuned by the internal UHF synthesizer. This

transmitter is designed to comply worldwide UHF unlicensed

band international radio regulations. The IC is compatible

with virtually all ASK/OOK (Amplitude Shift Keying/On-Off

Keyed) UHF receiver types from wide-band super-regenera-

tive radios to narrow-band, high performance super-hetero-

dyne receivers. The transmitter is designed to work with

transmitter data rates up to 115k bits per second.

The automatic tuning in conjunction with an external resistor,

insures that the transmitter output power stays constant at

maximum regulatory transmit power limits for the life of the

battery.

When coupled with Micrel’s family of QwikRadio™ receivers,

the MICRF103 provides the lowest cost and most reliable

remote actuator and RF link system available.

Typical Application

VDD

VSS

REFOSC

ASK

MICRF103

Note: Example for 868MHz

ASK DATA INPUT

RP2

6.8k

0.1µF

4.7µF

RP1

100k

+5V

8.2pF

100pF

1.0pF

10nH

1.0pF

27nH

ANTP

ANTM

STBY

100k

SAW Filter

50Ω

Monopole

PCB Antenna

Figure 1

Features

• Complete UHF transmitter on a monolithic chip

• Frequency range 800MHz to 1GHz

• Data rates to 115kbps

• Automatic antenna alignment, no manual adjustment

• Low external part count

• Low standby current <1µA

Applications

• Remote keyless entry systems (RKE)

• Remote fan/light control

• Garage door opener transmitters

• Remote sensor data links

Ordering Information

Part Number Temperature Range Package

MICRF103BM –40°C to +85°C 8-Pin SOIC

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

QwikRadio is a trademark of Micrel, Inc. The QwikRadio ICs were developed under a partnership agreement with AIT of Orlando, Florida.

MICRF103 Micrel

MICRF103 2 June 2002

Pin Description

Pin Number Pin Name Pin Function

1 PC Power Control Input. The voltage at this pin should be set between 0.1V to

0.4V for normal operation.

2 VDD Positive power supply input for the IC.

3 VSS This pin is the ground return for the IC. A power supply bypass capacitor

connected from VDD to VSS should have the shortest possible path.

4 REFOSC This is the timing reference frequency which is the transmit frequency

divided by 64. Connect a crystal (mode dependent) between this pin and

VSS, or drive the input with an AC coupled 0.5Vpp input clock. See

Refer-

ence Oscillator

section in this data sheet under

Electrical Characteristics.

5 STBY Input for transmitter stand-by control pin is pulled to VDD for transmit

operation and VSS for stand-by mode.

6 ANTM Negative RF power output to drive one side of the transmit antenna.

7 ANTP Positive RF power output to drive the other side of the transmit antenna.

8 ASK Amplitude Shift Key modulation data input pin. For CW operation, connect

this pin to VDD.

Pin Configuration

1PC

VDD

VSS

REFOSC

8 ASK

ANTP

ANTM

STBY

MICRF103BM

June 2002 3 MICRF103

MICRF103 Micrel

Electrical Characteristics

Specifications apply for 4.75V < V

< 5.5V, V

= 0.35V, T

= 25°C, freq

REFOSC

= 13.5625MHz, STBY = V

. Bold values indicate

–40°C ≤ T

≤ 85°C unless otherwise noted.

Parameter Condition Min Typ Max Units

Power Supply

Standby Supply Current, I

STBY

< 0.5V 0.10 µA

MARK Supply Current, I

@868MHz 19 26.5 mA

@915MHz 20 27.5 mA

SPACE Supply Current, I

OFF

@868MHz 14 18 mA

@915MHz 15 21 mA

MARK/SPACE Ratio 33%@868MHz 16 mA

33%@915MHz 17 mA

RF Output Section and Modulation Limits:

Maximum Power Level, P

OUT

@868MHz (EIRP) -3 dBm

@915MHz (EIRP) -3 dBm

Output Power Variation over supply and temperature ±2 dBm

Extinction ratio for ASK 38 45 dBc

Varactor tuning range Note 5 2.6 3.0 3.3 pF

Reference Oscillator Section

Reference Oscillator Input 300 kΩ

Impedance

Reference Oscillator Source 5.0 µA

Current

Reference Oscillator Input 0.2 1.0 V

Voltage (peak-to-peak)

Digital / Control Section

Calibration Time note 7, ASK=HIGH 20 ms

Power Amplifier Output Hold-off note 4, STDBY transition from LOW to HIGH 5 ms

Time from STBY crystal, ESR < 20Ω

Transmitter Stabilization Time from external reference (500mVpp) 9 ms

From STBY crystal, ESR < 20Ω 12 ms

Maximum Data rate

- ASK modulation duty cycle of the modulating signal = 50% 115 kbits/s

STBY HIGH V

enable voltage 0.8V

STBY LOW V

0.1V

ASK Pin V

, input high voltage 0.8V

, input low voltage 0.1V

ASK Input Current ASK = 0V, 5.0V input current –10 0.1 10 µA

Absolute Maximum Ratings (Note 1)

Supply Voltage(V

) .....................................................+6V

Voltage on I/O Pins ............................. V

–0.3 to V

+0.3

Storage Temperature Range ...................-65°C to + 150°C

Lead Temperature (soldering, 10 seconds) ........... + 300°C

ESD Rating, Note 3

Operating Ratings (Note 2)

Supply Voltage (V

) .................................... 4.75V to 5.5V

Maximum Supply Ripple Voltage ...............................10mV

PC Input Range......................................0.1V < V

< 0.4V

Ambient Operating Temperature (T

) ........ –40°C to +85°C

Programmable Transmitter Frequency Range:

........................................................ 800MHz to 1GHz

P1-P3 P4-P6 P7-P7

MICRF103BM

Mfr. #:

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Description:

RF TX IC ASK 800MHZ-1GHZ 8SOIC

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MICRF103BM

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