AD9772EB Analog Devices, AD9772EB Datasheet - Page 8

• Manufacturer Part Number: AD9772EB
• Description: 14-Bit/ 160 MSPS TxDAC+ with 2x Interpolation Filter
• Manufacturer: Analog Devices

AD9772
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, normal-
ized 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 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
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.
FROM HP8644A
SIGNAL GENERATOR
CLOCK
EXT.
AWG2021
DG2020
OR
DIGITAL
DATA
1k
1k
CLK+
CLK–
SLEEP
CLKCOM
CLKVDD
DCOM
TRIGGERED
3.0V
LATCHES
EDGE-
Figure 3. Basic AC Characterization Test Setup
DVDD
1
3.0V
AD9772
MIN
1 /2
INTERPOLATION
or T
ACOM
FILTER
2
CLOCK DISTRIBUTION
AND MODE SELECT
MAX
FIR
AVDD
3.0V
CONTROL
.
FILTER
CH2
CH1
–8–
CONTROL
MUX
PULSE GENERATOR
STUFF
ZERO
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 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)
S/N 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.
Passband
Frequency band in which any input applied therein passes
unattenuated to the DAC output.
Stopband Rejection
The amount of attenuation of a frequency outside the passband
applied to the DAC, relative to a full-scale signal applied at the
DAC input within the passband.
Group Delay
Number of input clocks between an impulse applied at the
device input and peak DAC output current.
Impulse Response
Response of the device to an impulse applied to the input.
Adjacent Channel Power Ratio (or ACPR)
A ratio in dBc between the measured power within a channel
relative to its adjacent channel.
MUX
EXT. INPUT
REFLO
AND CONTROL AMP
+1.2V REFERENCE
HP8130
2 /4
MULTIPLIER
PLLCLOCK
14-BIT DAC
PLLCOM
PLLVDD
FSADJ
IOUTA
IOUTB
REFIO
LPF
1.91k
0.1 F
50
20pF
100
50
MINI-CIRCUITS
T1–1T
20pF
REV. 0
SPECTRUM
TO FSEA30
ANALYZER