HSP45314 Ver la hoja de datos (PDF) - Intersil

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HSP45314

CommLink™ Direct Digital Synthesizer

Intersil 

HSP45314

Definition of Specifications

Differential Non-Linearity, DNL, is the measure of the step

size output deviation from code to code. Ideally the step size

should be 1LSB. A DNL specification of 1LSB or less

guarantees monotonicity.

Integral Non-Linearity, INL, is the measure of the worst

case point that deviates from a best fit straight line of data

values along the transfer curve.

Full Scale Gain Drift, is measured by setting the DAC

inputs to be all logic high (all 1s) and measuring the output

voltage through a known resistance as the temperature is

varied from TMIN to TMAX. It is defined as the maximum

deviation from the value measured at room temperature to

the value measured at either TMIN or TMAX. The units are

ppm of FSR (Full Scale Range) per oC.

Full Scale Gain Error, is the error from an ideal ratio of 32

between the DAC output current and the full scale adjust

current (through RSET).

Internal Reference Voltage Drift, is defined as the

maximum deviation from the value measured at room

temperature to the value measured at either TMIN or TMAX.

The units are ppm per oC.

Offset Drift, is measured by setting the DAC inputs to all

logic low (all 0s) and measuring the output voltage through a

known resistance as the temperature is varied from TMIN to

TMAX. It is defined as the maximum deviation from the value

measured at room temperature to the value measured at

either TMIN or TMAX. The units are ppm of FSR (Full Scale

Range) per degree oC.

Offset Error, is measured by setting the DAC inputs to all

logic low (all 0s) and measuring the output voltage through a

known resistance. Offset error is defined as the maximum

deviation of the output current from a value of 0mA.

Output Settling Time, is the time required for the output

voltage to settle to within a specified error band measured

from the beginning of the output transition. The

measurement is done by switching quarter scale.

Termination impedance was 25Ω due to the parallel

resistance of the 50Ω loading on the output and the

oscilloscope’s 50Ω input. This also aids the ability to resolve

the specified error band without overdriving the oscilloscope.

Output Voltage Compliance Range, is the voltage limit

imposed on the output. The output impedance should be

chosen such that the voltage developed at either IOUTA or

IOUTB does not violate the compliance range.

Power Supply Rejection, is measured using a single power

supply. The supply’s nominal +5V is varied ±10% and the

change in the DAC full scale output current is noted.

Reference Input Multiplying Bandwidth, is defined as the

3dB bandwidth of the voltage reference input. It is measured

by using a sinusoidal waveform as the external reference

with the digital inputs to the DAC set to all 1s. The frequency

is increased until the amplitude of the output waveform is

0.707 (-3dB) of its original value.

Spurious Free Dynamic Range, SFDR, is the amplitude

difference from the fundamental signal to the largest

harmonically or non-harmonically related spur within the

specified frequency window.

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