MSM66577 datasheet(32/34 Pages) OKI

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PEDL66577-01

1Semiconductor

MSM66577 Family

32/34

D/A Converter Characteristics

MSM66577/Q577 (V

DD = 4.5 to 5.5 V, Ta = –30 to +70°C)

MSM66577L (V

DD = 2.4 to 3.6 V, Ta = –30 to +70°C)

MSM66Q577LY (V

DD = 3.0 to 3.6 V, Ta = –30 to +70°C)

Parameter

Symbol

Condition

Min.

Typ.

Max.

Unit

Resolution

—

Bit

Linearity error

——

±1

Absolute precision

—

——

±2

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 2

8 = 256, resolution of (V

DD – 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 V

DD 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 = (V

DD – 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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