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STLC60134 Datasheet(PDF) 13 Page - STMicroelectronics

No. de pieza STLC60134
Descripción Electrónicos  TOSCA INTEGRATED ADSL CMOS ANALOG FRONT-END CIRCUIT
PDF  22 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STLC60134 Datasheet(HTML) 13 Page - STMicroelectronics

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Table 21. VCXO circuit Characteristics
Symbol
Parameter
Min.
Nominal
Max.
Note
fabs
Absolute frequency accuracy
-15ppm
35.328MHz
+15ppm
frange
Frequency Tuning Range
±50ppm
IO
VCXO Output Current
100
µA
Rref = 16.5k
Ω
AVDD = 3.3V
Ii
Reference Input Current
100
µA
1mA
AVDD = 3.3V
N.B: frequency tuning range is proportional to the crystal dynamic capacitance Cm.
DAC
Ct
Rt
AGND
XTALO
XTALI
CP
VCXOUT
IVCO
RREF
Ii
IO=Ii
AVDD
AVDD/22
÷AVDD/2
Filtered VCXO
(se e CTRLIN table)
VCOCX
AVDD
1M
Ω
Clk35
±30%
CS
-1 5V
CTRLIN
8 bits
D98TL364mod
Figure 11. Principle of VCXO control
The tuning must be monotonic with 8-bit resolution with the worst-case tuning step of <2ppm/LSB (8-bit).
The time constant of the tuning must be variable from 5s to 10s through an external capacitor Cs (R =
1M
Ω ±30%). This determines the speed of the VCXO in normal operation (slow speed in ”show time”)
with filtered VCXO. For faster tracking, the previous filter is not used and the speed depends on CtRt.
STLC60134S
13/22



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