MSM66579 datasheet(34/37 Pages) OKI

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PEDL66579-03

1Semiconductor

MSM66579 Family

34/37

D/A Converter Characteristics

(VDD = 2.4 to 3.6 V/4.5 to 5.5 V, Ta = –30 to +70°C)

Parameter

Symbol

Condition

Min.

Typ.

Max.

Unit

Resolution

—

Bit

Linearity error

——

Absolute precision

—

——

LSB

Conversion time

CONV

L = 50 pF

—

µs

Analog output impedance

—

Ω

Definition of Terminology

1. Resolution

Resolution is the value of minimum discernible analog output.

With 8 bits, since 28 = 256, resolution of (VDD – GND) ÷ 256 is possible.

2. Linearity error

Linearity error is the difference between ideal conversion characteristics and actual conversion characteristics of

an 8-bit D/A converter.

Ideal conversion characteristics can be obtained by dividing the voltage between VDD and GND into 256 equal

steps.

3. Differential linearity error

Differential linearity error indicates the smoothness of conversion characteristics. Ideally, the range of analog

input voltage that corresponds to 1 converted bit of digital input is 1LSB = (VDD – GND) ÷ 256. Differential error

is the difference between this ideal bit size and bit size of an arbitrary point in the conversion range.

4. Absolute precision

Absolute precision is a gross error including a linearity error and the effect of noise.

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