December 2000

MICRF007

Micrel

MICRF007

QwikRadioTM Low-Power UHF Receiver

Preliminary Information

Typical Application

SEL0

VSS

REFOSC

ANT

CAGC

VDDRF

SHUT

CTH

0.047

Data
Output

MICRF007

4.7

+5V

315MHz 1200b/s On-Off Keyed Receiver

Features

ˇ Complete UHF receiver on a monolithic chip
ˇ 300MHz
ˇ Data Rates up to 2.1kbps
ˇ Automatic tuning, no manual adjustment
ˇ Low Power Consumption

315MHz:
1.7 mA fully operational
0.5

A shutdown

170

A polled

433.92MHz:
3.0mA fully operational
0.5

A shutdown

300

A in 10:1 polled operation

ˇ Very low RF re-radiation at the antenna
ˇ CMOS logic interface to standard decoder and micro-

processor ICs

ˇ Extremely low external part count
ˇ No filters or inductors required

Applications

ˇ Automotive Remote Keyless Entry (RKE)
ˇ Long Range RF Identification
ˇ Remote fan and light control
ˇ Garage door and gate openers

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

QwikRadio is a trademark of Micrel, Inc.

General Description

The MICRF007 is a single chip ASK/OOK (ON-OFF Keyed)
Receiver IC for remote wireless applications, employing
Micrel's latest QwikRadio

technology. This device is a true

"antenna-in to data-out" monolithic device. All RF and IF
tuning is accomplished automatically within the IC which
eliminates manual tuning, and reduces production costs.
The result is a highly reliable yet extremely low cost solution.
The MICRF007 is an enhanced version of the MICRF002 and
MICRF011.

The MICRF007 is a conventional superhetrodyne receiver,
with an (internal) Local oscillator fixed at a single frequency
based on an external reference crystal or clock. As with any
conventional superhetrodyne reciever, the

transmit frequency

must be accurately controlled, generally with a crystal or
SAW (Surface Acoustic Wave) resonator.

The MICRF007 provides two feature enhancements over the
MICRF001/011, (1) a Shutdown Mode, which may be used
for duty-cycle operation. (2) Reduced current consumption.
The MICRF007 requires a mere 1.7mA at 315MHz (3.0mA at
433.92MHz).These features make the MICRF007 ideal for
low and ultra-low power applications, such as RKE and RFID.

All post-detection (demodulator) data filtering is provided on
the MICRF007, so no external baseband filters are required.
The demodulator filter bandwidth is set to 2.1kHz. Data rates
up to 2kbps may be used

December 2000

MICRF007

Micrel

Pin Description

Pin Number

Pin Name

Pin Function

VSS

Ground Return (Input): Ground return to the power supply. See "Application
Information" for bypass capacitor details.

ANT

Antenna (Input): High-impedance, internally ac coupled receiver input.
Connect this pin to the receive antenna. This FET gate input has approxi-
mately 2pF of shunt (parasitic) capacitance. See "Applications Information"
for optional band-pass filter information.

VDD

Power Supply (Input): Positive supply input for the RF IC. Connect a low
ESL, low ESR decoupling capacitor from this pin to VSS, lead lengths
should be as short as possible.

CTH

[Data Slicing] Threshold Capacitor (External Component): Capacitor
extracts the dc average value from the demodulated waveform which
becomes the reference for the internal data slicing comparator. See "Appli-
cations Information" for selection.

Digital Output (Output): CMOS-level compatible data output signal.

SHUT

Shutdown (Input): Shutdown-mode logic-level control input. Pull low to
enable the receiver. This input has an internal pulled-up to VDD.

CAGC

AGC Capacitor (External Component): Integrating capacitor for on-chip
AGC (automatic gain control). The decay/attack time-constant (t) ratio is
nominally 10:1. See "Applications Information" for capacitor selection.

REFOSC

Reference Oscillator (External Component or Input): Timing reference for
on-chip tuning and alignment. Connect a crystal between this pin and VSS,
or drive the input with an ac-coupled 0.5Vpp input clock.

MICRF007

Micrel

MICRF007

December 2000

Electrical Characteristics

DDRF

= V

DDBB

= V

where +4.75V

5.5V, V

= 0V; C

AGC

= 4.7

F, C

= 0.047

F; f

REFOSC

= 4.90MHz; T

= 25

C, bold

values indicate 40

+85

C; current flow into device pins is positive; unless noted.

Symbol

Parameter

Condition

Min

Typ

Max

Units

Operating Current

continuous operation

5.5

10:1 duty cycle

300

STBY

Standby Current

SHUT

= V

0.5

RF Section, IF Section

Receiver Sensitivity

Notes 4, 6

dBm

IF Center Frequency

Note 7

0.86

MHz

IF 3dB Bandwidth

Notes 6, 7

400

0.43

kHz

ANT

RF Input Range

300

440

MHz

Receive Modulation Duty-Cycle

Maximum Receiver Input

= 50

20

dBm

Spurious Reverse Isolation

ANT pin, R

= 50

, Note 5

Vrms

AGC Attack to Decay Ratio

ATTACK

DECAY

0.1

AGC Leakage Current

= +85

100

Reference Oscillator

Reference Oscillator

to 1% of final value

2.5

3.1

Stabilization Time

REFOSC

Reference Oscillator

290

Input Impedance

Reference Oscillator Input Range

0.1

1.5

P-P

Reference Oscillator Source Current

4.5

5.2

2.8

Demodulator

CTH

CTH Source Impedance

Note 8

110

CTH

CTH Source Impedance Variation

15

+15

ZCTH(leak)

CTH Leakage Current

= +85

100

Demodulator Filter Bandwidth

SEL0

= V

SEL1

= V

SWEN

= V

, Notes 7, 9

4160

Demodulator Filter Bandwidth

SEL0

= V

SEL1

= V

, V

SWEN

= V

8320

Notes 5, 7, 9

Absolute Maximum Ratings

(Note 1)

Supply Voltage (V

DDRF

, V

DDBB

) .................................... +7V

Input/Output Voltage (V

I/O

) ................. V

0.3 to V

+0.3

Junction Temperature (T

) ...................................... +150

Storage Temperature Range (T

) ............ 65

C to +150

Lead Temperature (soldering, 10 sec.) ................... +260

ESD Rating, Note 3

Operating Ratings

(Note 2)

Supply Voltage (V

, V

DDBB

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

Ambient Temperature (T

) ......................... 40

C to +85

Package Thermal Resistance (

)

16-pin DIP (

) ................................................... 90

C/W

16-pin SOIC (

) .............................................. 120

C/W

December 2000

MICRF007

Micrel

Symbol

Parameter

Condition

Min

Typ

Max

Units

Digital/Control Section

IN(pu)

Input Pull-Up Current

SEL0, SEL1, SWEN, V

SHUT

= V

IN(high)

Input-High Voltage

SEL0, SEL1, SWEN

0.8V

IN(low)

Input-Low Voltage

SEL0, SEL1, SWEN

0.2V

OUT

Output Current

DO, WAKEB pins, push-pull

OUT(high)

Output High Voltage

DO, WAKEB pins, I

OUT

= 1

0.9V

OUT(low)

Output Low Voltage

DO, WAKEB pins, I

OUT

= +1

0.1V

, t

Output Rise and Fall Times

DO, WAKEB pins, C

LOAD

= 15pF

Note 1.

Exceeding the absolute maximum rating may damage the device.

Note 2.

The device is not guaranteed to function outside its operating rating.

Note 3.

Devices are ESD sensitive. Use appropriate ESD precautions. Meets class 1 ESD test requirements, (human body model HBM), in accor-
dance with MIL-STD-883C, method 3015. Do not operate or store near strong electrostatic fields.

Note 4:

Sensitivity is defined as the average signal level measured at the input necessary to achieve 10

-2

BER (bit error rate). The input signal is

defined as a return-to-zero (RZ) waveform with 50% average duty cycle (Manchester encoded data) at a data rate of 300b/s. The RF input is
assumed to be matched into 50

Note 5:

Spurious reverse isolation represents the spurious components which appear on the RF input pin (ANT) measured into 50

with an input RF

matching network.

Note 6:

Sensitivity, a commonly specified receiver parameter, provides an indication of the receiver's input referred noise, generally input thermal
noise. However, it is possible for a more sensitive receiver to exhibit range performance no better than that of a less sensitive receiver if the
background noise is appreciably higher than the thermal noise. Background noise refers to other interfering signals, such as FM radio
stations, pagers, etc.

A better indicator of achievable receiver range performance is usually given by its selectivity, often stated as intermediate frequency (IF) or
radio frequency (RF) bandwidth, depending on receiver topology. Selectivity is a measure of the rejection by the receiver of "ether" noise.
More selective receivers will almost invariably provide better range. Only when the receiver selectivity is so high that most of the noise on the
receiver input is actually thermal will the receiver demonstrate sensitivity-limited performance.

Note 7:

Parameter scales linearly with reference oscillator frequency f

. For any reference oscillator frequency other than 4.90MHz, compute new

parameter value as the ratio:

MHz

4.90

(parameter value at 4.90MHz)

REFOSC

Example: For reference oscillator freqency f

= 6.00MHz:

(parameter value at 6.00MHz)

6.00

4.90

(paramter value at 4.90MHz)

Note 8:

Parameter scales inversely with reference oscillator frequency f

. For any reference oscillator frequency other than 4.90MHz, compute new

parameter value as the ratio:

4.90

MHz

(parmeter value at 4.90MHz)

REFOSC

Example: For reference oscillator frequency f

= 6.00MHz:

(parmeter value at 6.00MHz)

4.90

6.00

(parmeter value at 4.90MHz)

Note 9:

Demodulator filter bandwidths are related in a binary manner, so any of the (lower) nominal filter values may be derived simply by dividing this
parameter value by 2, 4, or 8 as desired.

Part Number MICRF007