Micrel

MICRF211

March 2007

4

M9999-030107

(408) 944-0800

Demodulator

Symbol

Parameter

Condition

Min

Typ

Max

Units

CTH Source

Impedance

120

k

Ω

CTH Leakage Current

± 2

± 800

nA

nA

Demodulator Filter

Bandwidth @ 434MHz

Programmable, see application section

1625

13000

Hz

Digital / Control Functions

DO pin output current

As output

source @ 0.8 Vdd

sink @ 0.2 Vdd

260

600

µA

Output rise and fall

times

CI = 15pF, pin DO, 10-90%

2

µsec

RSSI

RSSI DC Output

Voltage Range

0.4 to 2

V

RSSI response slope

-110dBm to -40dBm

25

mV/dB

RSSI Output Current

400

µA

RSSI Output

Impedance

200

Ω

RSSI Response Time

50% data duty cycle, input power to

Antenna = -20dBm

0.3

sec

Note 1.

Exceeding the absolute maximum rating may damage the device.

Note 2.

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

Note 3.

Device is ESD sensitive. Use appropriate ESD precautions. Exceeding the absolute maximum rating may damage the device.

Note 4.

defined as a return-to-zero (RZ) waveform with 50% average duty cycle (Manchester encoded) at a data rate of 1kbps.

Note 5.

When data burst does not contain preamble, duty cycle is defined as total duty cycle, including any “quiet” time between data bursts. When

data bursts contain preamble sufficient to charge the slice level on capacitor C , then duty cycle is the effective duty cycle of the burst

alone. [For example, 100msec burst with 50% duty cycle, and 100msec “quiet” time between bursts. If burst includes preamble, duty

cycle is T

/(T

+t

)= 50%; without preamble, duty cycle is T

/(T

+ T

+ T

) = 50msec/(200msec)=25%. T

is the (Average

number of 1’s/burst) × bit time, and T

= T

– T

.)

TH

ON

ON

OFF

ON

ON

OFF

QUIET

ON

OFF

BURST

ON