HC05 datasheet(166/232 Pages) MOTOROLA

166 / 232 page

MOTOROLA

12-4

MC68HC05X16

Rev. 1

ELECTRICAL SPECIFICATIONS

12.3

A/D converter characteristics

(1) Performance veriﬁed down to 2.5V

∆VR, but accuracy is tested and guaranteed at ∆VR = 5V±10%.

(2) Source impedances greater than 10k

Ω will adversely affect internal charging time during input sampling.

(3) The external system error caused by input leakage current is approximately equal to the product of R source and input

current. Input current to A/D channel will be dependent on external source impedance (see Figure 9-2).

Table 12-3 A/D characteristics

(VDD = 5.0 Vdc ± 10%, VSS = 0 Vdc, TA = –40°C to +125°C)

Characteristic

Parameter

Min

Max

Unit

Resolution

Number of bits resolved by the A/D

—

Bit

Non-linearity

Max deviation from the best straight line through the A/D

transfer characteristics

(VRH = VDD and VRL = 0V)

—

± 0.5

LSB

Quantization error

Uncertainty due to converter resolution

—

± 0.5

LSB

Absolute accuracy

Difference between the actual input voltage and the

full-scale equivalent of the binary code output code for all

errors

—

± 1

LSB

Conversion range

Analog input voltage range

VRL

VRH

Maximum analog reference voltage

VRL

VDD + 0.1

VRL

Minimum analog reference voltage

VSS – 0.1

VRH

∆V

(1)

Minimum difference between VRH and VRL

3—

Conversion time

Total time to perform a single analog to digital conversion

a. External clock (OSC1, OSC2)

b. Internal RC oscillator

—

tCYC

µs

Monotonicity

Conversion result never decreases with an increase in

input voltage and has no missing codes

GUARANTEED

Zero input reading

Conversion result when VIN = VRL

—

Hex

Full scale reading

Conversion result when VIN = VRH

—FF

Hex

Sample acquisition time

Analog input acquisition sampling

a. External clock (OSC1, OSC2)

b. Internal RC oscillator(2)

—

tCYC

µs

Sample/hold capacitance Input capacitance on PD0/AN0–PD7/AN7

—

Input leakage(3)

Input leakage on A/D pins PD0/AN0–PD7/AN7, VRL, VRH

—

µA

164

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