MICRF005 データシートの表示（PDF） - Micrel

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MICRF005

115kbps, 800MHz - 1GHz UHF Receiver

Micrel 

MICRF005

Polarity of the droop is unknown, meaning the AGC voltage

could droop up or down. Worst-case from a recovery stand-

point is downward droop, since the AGC pullup current is

1/10th magnitude of the pulldown current. The downward

droop is replenished according to the Equation (6):

(6)

I = ∆V

CAGC ∆t

where:

I = AGC pullup current for the initial [tbd]ms (67.5µA)

CAGC = AGC capacitor value

∆t = droop recovery time

∆V = droop voltage

Micrel

For example, if user desires ∆t = 10ms and chooses a 4.7µF

CAGC, then the allowable droop is about 144mV. Using the

same equation with 200nA worst case pin leakage and

assuming 1µA of capacitor leakage in the same direction, the

maximum allowable ∆t (shutdown time) is about 0.56s for

droop recovery in 10ms.

October 2001

9

MICRF005

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