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AS3977 bảng dữ liệu(PDF) 10 Page - ams AG

tên linh kiện AS3977
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PDF  47 Pages
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nhà sản xuất  AMSCO [ams AG]
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AS3977 bảng dữ liệu(HTML) 10 Page - ams AG

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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
12
16
20
MHz
tXOSC
Crystal Oscillator Start up time
VSUP=2.0…3.6V,
TAMB=-40…85ºC
crystal series resistance
≤ 100Ω
1.5
ms
RXOSC
Crystal Oscillator Oscillation Margin
Level
fXOSC=13.56MHz, CL=12pF
1500
Ω
Δf/f0
Frequency Stability vs. Temperature
1
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
V
VMCH
High level output voltage
VSUP=3V, at nominal high level output
current
0.9*VSUP
V
CLMCC
Capacitive load
20
pF
tRMCC
Rise time
62.5
ns
tFMCC
Fall time
62.5
ns
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
46
61
77
Hz
92
122
153
tSYNTH
Synthesizer Start up Time
500
µs
tLOCK
Synthesizer Lock Time
Δf=600kHz,
fERROR @ tLOCK=10kHz
50
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
55
kHz
@ 25 µA
85
@ 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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