AD9760
DEFINITIONS OF SPECIFICATIONS
Temperature Drift
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.
Temperature drift is 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.
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.
Power Supply Rejection
The maximum change in the full-scale output as the supplies
are varied from nominal to minimum and maximum specified
voltages.
Monotonicity
A D/A converter is monotonic if the output either increases or
remains constant as the digital input increases.
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.
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 all
inputs are set to 1s.
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.
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.
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.
Output Compliance Range
Total Harmonic Distortion
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.
THD is the ratio of the rms sum 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).
+5V
0.1F
REFLO
+1.20V REF
REFIO
COMP1
AVDD
ACOM
AD9760
50pF
0.1F
PMOS
0.1F
COMP2
CURRENT SOURCE
ARRAY
FS ADJ
MINI-CIRCUITS
T1-1T
R
2k⍀
SET
TO HP3589A
SPECTRUM/
NETWORK
ANALYZER
50⍀ INPUT
+5V
DVDD
I
OUTA
LSB
SWITCHES
SEGMENTED SWITCHES
100⍀
DCOM
I
OUTB
FOR DB11–DB3
CLOCK
SLEEP
LATCHES
DVDD
DCOM
50⍀
50⍀
20pF
50⍀
RETIMED
20pF
CLOCK
DIGITAL
DATA
OUTPUT*
CLOCK
OUTPUT
* AWG2021 CLOCK RETIMED
SUCH THAT DIGITAL DATA
TRANSITIONS ON FALLING EDGE
OF 50% DUTY CYCLE CLOCK.
LECROY 9210
PULSE GENERATOR
TEKTRONIX
AWG-2021
Figure 2. Basic AC Characterization Test Setup
REV. B
–6–