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3

June 1998

MICRF001

MICRF001

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)..............+ 300

°C

Operating Ratings

Supply Voltage (VDDRF, VDDBB)....................4.75V to 5.5V

Ambient Operating Temperature (TA)............-40

°C to +85°C

Package Thermal Resistance

θja (14 Pin DIP)..........90°C/W

Electrical Characteristics

Unless otherwise stated, these specifications apply for Ta=-40

°C to 85°C, 4.75<VDD<5.5V. All voltages are with respect to

Ground. CAGC = CTH = .047µF, VDDRF= VDDBB = VDD. REFOSC frequency = 2.442MHz.

Parameter

Test Conditions

MIN

TYP

MAX

UNITS

Power Supply

Operating Current

Ta= 25

°C

6.3

mA

Operating Current

Reference Oscillator powered down

2

mA

RF/IF Section

Receiver Sensitivity

Note 1, 3

-95

dBm

IF Center Frequency

2.25

MHz

IF Bandwidth

Note 3

1.0

MHz

Receive Data Rate

0.1

4.8

kbps

RF Input Range

300

440

MHz

Receive Modulation Duty-Cycle

20

80

%

Maximum Receiver Input

Rs = 50

Ω

-20

dBm

Spurious Reverse Isolation

ANT pin, Rs = 50

Ω Note 2

30

µVrms

AGC Attack / Decay ratio

T(Attack) / T(Decay)

0.1

Oscillator Turn-on Time

0.1

s

Demod Section

CTH Source Impedance

SEL0=SEL1=VDD, See Table 1

200k

Ω

CTH Source Impedance Variation

-15

+15

%

Digital Section

REFOSC Input Impedance

200k

Ω

Input Pullup Impedance

SEL0, SEL1, SWEN

1000k

Ω

Output Current

DO pin, Push-Pull

10

µA

Output High Voltage

DO pin, Iout = 1µA

0.9VDD

V

Output Low Voltage

DO pin, Iout = 1µA

0.1VDD

V

Output Tr, Tf

DO pin, Cload=15pF

10

µsec

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 at a data rate of 2400bps. The RF input

is assumed to be matched into 50

Ω.

Note 2:

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

Ω

with an input RF matching network.

Note 3:

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 “ether” noise is appreciably higher than the thermal noise. “Ether” noise refers to other interfering

“noise” sources, such as FM radio stations, pagers, etc.

A better indicator of 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.

This device is ESD sensitive: Meets Class 1 ESD test

requirements (Human Body Model, HBM), in accordance with

MIL-STD-883C, Method 3015. Do not operate or store near

strong electrostatic fields. Use appropriate ESD precautions.