AD9764 Datasheet, PDF (6/22 Pages) Analog Devices – 14-Bit, 125 MSPS TxDAC D/A Converter

AD9764
DEFINITIONS OF SPECIFICATIONS
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 (or 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.
Offset Error
The deviation of the output current from the ideal of zero is
called offset error. For I_OUTA, 0 mA output is expected when the
inputs are all 0s. For I_OUTB, 0 mA output is expected when all
inputs are set to 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
Temperature drift is specified as the maximum change from the
ambient (+25°C) value to the value at either T_MIN or T_MAX. 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 over a specified range.
Settling Time
The time required for the output to reach and remain within a
specified error band about its final value, measured from the
start of the output transition.
Glitch Impulse
Asymmetrical switching times in a DAC give rise to 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 is the ratio of the sum of the rms value of the first six
harmonic components to the rms value of the measured output
signal. It is expressed as a percentage or in decibels (dB).
Multitone Power Ratio
The spurious-free dynamic range for an output containing mul-
tiple carrier tones of equal amplitude. It is measured as the
difference between the rms amplitude of a carrier tone to the
peak spurious signal in the region of a removed tone.
+5V
0.1␮F
DVDD
DCOM
REFLO
COMP1
AVDD
ACOM
0.1␮F
R_SET
2k⍀ +5V
+1.20V REF
REFIO
FS ADJ
50pF
AD9764
PMOS
CURRENT SOURCE
ARRAY
COMP2 ^0.1␮F
DVDD
DCOM
SEGMENTED SWITCHES
FOR DB13–DB5
LSB
SWITCHES
I_OUTA
I_OUTB
CLOCK
RETIMED
CLOCK
OUTPUT*
50⍀
LECROY 9210
PULSE GENERATOR
SLEEP
CLOCK
OUTPUT
LATCHES
DIGITAL
DATA
TEKTRONIX
AWG-2021
50⍀
50⍀
20pF
Figure 2. Basic AC Characterization Test Setup
100⍀
MINI-CIRCUITS
T1-1T
TO HP3589A
SPECTRUM/
NETWORK
ANALYZER
50⍀ INPUT
20pF
* AWG2021 CLOCK RETIMED
SUCH THAT DIGITAL DATA
TRANSITIONS ON FALLING EDGE
OF 50% DUTY CYCLE CLOCK.
–6–
REV. B