Specifications

AMBE-3000F™ Vocoder Chip Users Manual
Version 3.4, April, 2014
H
ardware Information
Figure 8 X1/XCLKIN and X2 with Crystal Oscillator
NOTE A: It is recommended that the resonator/crystal vendor characterize the operation
of their device with the chip. The resonator/crystal vendor has the equipment and
expertise to tune the tank circuit. The vendor can also advise regarding the proper tank
component values that will ensure start up and stability over the entire operating range.
The typical specifications for the external quartz crystal for a frequency of 30 MHz are listed below:
 Fundamental mode, parallel resonant
 CL (load capacitance) = 12 pF
 C
L1
= C
L2
= 24 pF
 Cshunt = 6 pF
 ESR range = 25 to 40 Ohms
2.7.3 Input Clock Requirements
The clock provided at XCLKIN pin generates the internal CPU clock cycle.
ID Parameter Min. Max. Unit
A
t
c(Cl)
Cycle time, XCLKIN 6.67 250 ns
B
t
r(Cl)
Rise time, XCLKIN 6 ns
C
t
f(Cl)
Fall time, XCLKIN 6 ns
t
w(ClL)
Pulse duration XCLKIN Low as a percentage of t
c(Cl)
40 60 %
t
w(ClH)
Pulse duration XCLKIN High as a percentage of t
c(Cl)
40 60 %
Parameter Min Nom Max Unit
V
IH
High-level input voltage X1/XCLKIN (@50uA max) .7 (1v8) - 1v8 V
V
IL
Low-level input voltage X1/XCLKIN (@50uA max) 0.3 (1v8) V
Figure 9 Input Clock Requirements
(Subject to Change) Page 20
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