AD9755 View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

AD9755

14-Bit, 300 MSPS High Speed TxDAC+® D/A Converter

Analog Devices 

AD9755

TERMINOLOGY

Linearity Error (Also Called Integral Nonlinearity or INL)

Linearity error is defined as the maximum deviation of the actual

analog output from the ideal output, determined by a straight

line drawn from zero to full scale.

Differential Nonlinearity (DNL)

DNL is the measure of the variation in analog value, normalized

to full scale, associated with a 1 LSB change in digital input code.

Monotonicity

A D/A converter is monotonic if the output either increases or

remains constant as the digital input increases.

Offset Error

The deviation of the output current from the ideal of zero is

called offset error. For IOUTA, 0 mA output is expected when the

inputs are all 0s. For IOUTB, 0 mA output is expected when the

inputs are all 1s.

Gain Error

The difference between the actual and ideal output span. The

actual span is determined by the output when all inputs are set

to 1s, minus the output when all inputs are set to 0s.

Output Compliance Range

The range of allowable voltage at the output of a current-output

DAC. Operation beyond the maximum compliance limits may

cause either output stage saturation or breakdown, resulting in

nonlinear performance.

Temperature Drift

Specified as the maximum change from the ambient (25°C) value

to the value at either TMIN or TMAX. For offset and gain drift, the

drift is reported in ppm of full-scale range (FSR) per degree C.

For reference drift, the drift is reported in ppm per degree C.

Power Supply Rejection

The maximum change in the full-scale output as the supplies

are varied from minimum to maximum specified voltages.

Settling Time

The time required for the output to reach and remain within a

specified error band around its final value, measured from the

start of the output transition.

Glitch Impulse

Asymmetrical switching times in a DAC cause undesired output

transients that are quantified by a glitch impulse. It is specified

as the net area of the glitch in pV-s.

Spurious-Free Dynamic Range

The difference, in dB, between the rms amplitude of the output

signal and the peak spurious signal over the specified bandwidth.

Total Harmonic Distortion (THD)

THD is the ratio of the rms sum of the first six harmonic com-

ponents to the rms value of the measured fundamental. It is

expressed as a percentage or in decibels (dB).

Signal-to-Noise Ratio (SNR)

SNR is the ratio of the rms value of the measured output signal

to the rms sum of all other spectral components below the

Nyquist frequency, excluding the first six harmonics and dc.

The value for SNR is expressed in decibels.

Adjacent Channel Power Ratio (ACPR)

A ratio in dBc between the measured power within a channel

relative to its adjacent channel.

0.1␮F

RSET

2k⍀

3.0V TO 3.6V

1.2V REF

REFIO

DVDD AVDD

PMOS CURRENT

SOURCE ARRAY

FSADJ

SEGMENTED

SWITCHES FOR

DB0 TO DB13

DAC

DAC LATCH

AD9755

DCOM

ACOM

2 –1 MUX

PORT 1 LATCH

PORT 2 LATCH

PLL

CIRCUITRY

IOUTA

IOUTB

PLLVDD

CLKVDD

RESET

LPF

CLKCOM

DIV0

DIV1

50⍀

MINI

CIRCUITS

T1-1T

50⍀

DB0 – DB13

DB0 – DB13 CLK+ CLK–

DIGITAL DATA INPUTS

TEKTRONIX DG2020

OR

AWG2021 w/OPTION 4

MINI

CIRCUITS

T1-1T

PLLLOCK

1k⍀

1k⍀

3.0V TO 3.6V

TO ROHDE &

SCHWARZ

FSEA30

SPECTRUM

ANALYZER

LECROY 9210

PULSE GENERATOR

(FOR DATA RETIMING)

PLL ENABLED

PLL DISABLED

HP8644

SIGNAL

GENERATOR

Figure 2. Basic AC Characterization Test Setup

REV. B

–7–

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