AS3977 datasheet(10/47 Pages) AMSCO

10 / 47 page

www.austriamicrosystems.com/AS3977

Revision 3.6

10 - 47

AS3977

Data Sheet - E l e c t r i c a l C h a r a c t e r i s t i c s

fXOSC

Crystal Oscillator Frequency

MHz

tXOSC

Crystal Oscillator Start up time

VSUP=2.0…3.6V,

TAMB=-40…85ºC

crystal series resistance

≤ 100Ω

1.5

RXOSC

Crystal Oscillator Oscillation Margin

Level

fXOSC=13.56MHz, CL=12pF

1500

Δf/f0

Frequency Stability vs. Temperature

AS3977 Only

±1

ppm

Micro Controller Clock Driver

fMCCLK

Clock output frequency

depending on configuration register

settings and crystal

4MHz

VMCL

Low level output voltage

VSUP=3V, at nominal high level output

current

0.1*VSUP

VMCH

High level output voltage

VSUP=3V, at nominal high level output

current

0.9*VSUP

CLMCC

Capacitive load

tRMCC

Rise time

62.5

tFMCC

Fall time

62.5

IMCH

High level output current

1mA

IMCL

Low level output current

1mA

1. These parameters will not be tested.

Table 7. Phase Locked Loop

Symbol

Parameter

Conditions

Min

Typ

Max

Units

fREF

Comparison Frequency

depending on fXOSC

(reference divider division ratio = 4)

3.0

4.0

5.0

MHz

ΔfO

Output Frequency Resolution

fOUT315 / fOUT434

fOUT868 / fOUT915

122

153

tSYNTH

Synthesizer Start up Time

500

µs

tLOCK

Synthesizer Lock Time

Δf=600kHz,

fERROR @ tLOCK=10kHz

200

µs

Table 8. Loop Filter Bandwidth

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Filter Bandwidth at 315 MHz

fBW

Charge pump setting:

ICHP

@ 12.5 µA

Reference Frequency = 4MHz

VSUP = 3.0 V;

TAMB = 25ºC

kHz

@ 25 µA

@ 37.5µA

115

@ 50 µA

170

Filter Bandwidth at 433 MHz

Table 6. (Continued)Reference Frequency Generator and Micro Controller Clock Driver

Symbol

Parameter

Conditions

Min

Typ

Max

Units

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