DOC4106 datasheet(27/47 Pages) ATMEL

27 / 47 page

AT8xC51SND1C

4106F–8051–10/02

A-to-D Converter

Oscillator and Crystal

Schematic

Figure 12. 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 36. Oscillator and Crystal Characteristics VDD = 2.7 to 3.3V , TA =-40° to +85°C

Table 35. A-to-D Converter DC Characteristics V

DD = 2.7 to 3.3V , TA =-40° to +85°C

Symbol

Parameter

Min

Typ

Max

Units

Test Conditions

Analog Supply Voltage

2.7

3.3

Analog Operating Supply Current

600

µA

DD =3.3V

AIN1:0 = 0 to A

VDD

AIPD

Analog Standby Current

µA

VDD =3.3V

ADEN = 0 or PD = 1

AVIN

Analog Input Voltage

AVSS

VDD

REF

Reference Voltage

REFN

AREFP

2.4

VDD

RREF

AREF Input Resistance

Ω

TA =25°C

CIA

Analog Input capacitance

TA =25°C

VSS

Symbol

Parameter

Min

Typ

Max

Unit

CX1

Internal Capacitance (X1 - VSS)

CX2

Internal Capacitance (X2 - VSS)

Equivalent Load Capacitance (X1 - X2)

Drive Level

µW

Crystal Frequency

MHz

Crystal Series Resistance

Ω

Crystal Shunt Capacitance

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