Z8 Encore! XP® 4K Series
Product Specification
187
Table 113. Recommended Crystal Oscillator Specifications
Parameter
Load Capacitance (C )
Value
Units
pF
Comments
Maximum
Maximum
Maximum
30
7
L
Shunt Capacitance (C )
pF
0
Drive Level
1
mW
Table 114. Transconductance Values for Low, Medium, and High Gain Operating Modes
Transconductance (mA/V)
Use this range for
Mode
Crystal Frequence Range
Function
calculations
Low Gain
(see Note)
32 KHz - 1 MHz
Low Power/Frequency
Applications
0.02
0.84
1.1
0.04
0.09
3.1
Medium Gain 0.5 MHz - 10 MHz
(see Note)
Medium Power/Frequency
Applications
1.7
2.3
High Gain
(see Note)
8 MHz - 20 MHz
High Power/Frequency
Applications
4.2
Note: * Printed circuit board layout should not add more than 4 pF of stray capacitance to either XIN or XOUT pins. if
no Oscillation occurs, reduce the values of the capacitors C1 and C2 to decrease the loading.
Oscillator Operation with an External RC Network
Figure 28 illustrates a recommended configuration for connection with an external resis-
tor-capacitor (RC) network.
PS022815-0206
Crystal Oscillator
ZILOG [ ZILOG, INC. ]
