Rainbow Electronics AT89C5132 - Manual (Page 139)

139
AT8xC5132
4173A–8051–08/02
A-to-D Converter Table 125. A-to-D Converter DC Characteristics V
DD
= 2.7 to 3.3V , TA = -40
°
C to
+85
°
C
Oscillator and Crystal
Schematic Figure 116. Crystal Connection
Note: For operation with most standard crystals, no external components are needed on X1
and X2. It may be necessary to add external capacitors on X1 and X2 to ground in spe-
cial cases (max 10 pF). X1 and X2 may not be used to drive other circuits.
Parameters Table 126. Oscillator and Crystal Characteristics V
DD
= 2.7 to 3.3V , TA = -40
°
to +85
°
C
Symbol Parameter Min Typ Max Units Test Conditions
AV
DD
Analog Supply Voltage 2.7 3.3 V
AI
DD
Analog Operating Supply
Current
600 µ A
AV
DD
= 3.3V
AIN1:0 = 0 to AV
DD
AI
PD
Analog Standby Current 2 µ A
A V
DD
= 3.3V
ADEN = 0 or PD = 1
AV
IN
Analog Input Voltage AV
SS
A V
DD
V
AV
REF
Reference Voltage
A
REFN
A
REFP
AV
SS
2.4 A V
DD
V
V
R
REF
AREF Input Resistance 10 30 k Ω T
A
= 25 ° C
C
IA
Analog Input capacitance 10 pF T
A
= 25 ° C
V
SS
X1
X2
Q
C1
C2
Symbol Parameter Min Typ Max Unit
C
X1
Internal Capacitance (X1 - V
SS
) 10 pF
C
X2
Internal Capacitance (X2 - V
SS
) 10 pF
C
L
Equivalent Load Capacitance (X1 - X2) 5 pF
DL Drive Level 50 µ W
F Crystal Frequency 20 MHz
RS Crystal Series Resistance 40 Ω
CS Crystal Shunt Capacitance 6 pF