MICRF009 データシートの表示（PDF） - Micrel

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MICRF009

QwikRadio® Low-Power UHF Receiver

Micrel 

Micrel

MICRF009

CAGC = AGC capacitor value

∆t = droop recovery time

∆V = droop voltage

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, the 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.

The ratio of decay-to-attack time-constant is fixed at 1:10

(that is, the attack time constant is 10 times of the decay

time constant). Generally the design value of 1:10 is

adequate for the vast majority of applications. If adjustment

is required, adding a resistor in parallel of the CAGC

capacitor may vary the ratio. The value of the resistor must

be determined on a case-by-case basis.

January 18, 2005

9

M9999-011805

(408) 955-1690

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