AD9433-105 Analog Devices, AD9433-105 Datasheet - Page 6

• Manufacturer Part Number: AD9433-105
• Description: 12-Bit, 105/125 MSPS Analog-to-digital if Sampling Converter
• Manufacturer: Analog Devices

DEFINITIONS OF SPECIFICATIONS
Differential Analog Input Voltage Range
The peak to peak differential voltage that must be applied to
the converter to generate a fullscale response. Peak
differential voltage is computed by observing the voltage on
a single pin and subtracting the voltage from the other pin,
which is 180 degrees out of phase. Peak to peak differential
is computed by rotating the inputs phase 180 degrees and
taking the peak measurement again. Then the difference is
computed between both peak measurements.
Differential Nonlinearity
The deviation of any code width from an ideal 1 LSB step.
Effective Number of Bits
The effective number of bits (ENOB) is calculated from the
measured SNR based on the equation:
Encode Pulse Width/Duty Cycle
Pulse width high is the minimum amount of time that the
ENCODE pulse should be left in logic “1” state to achieve
rated performance; pulse width low is the minimum time
ENCODE pulse should be left in low state. See timing
implications of changing t
these specs define an acceptable Encode duty cycle.
Fullscale Input Power
Expressed in dBm. Computed using the following equation:
Gain
Gain error is the difference between the measured and ideal
full scale input voltage range of the ADC.
Harmonic Distortion, 2
The ratio of the rms signal amplitude to the rms value of the
second harmonic component, reported in dBc.
Harmonic Distortion, 3
The ratio of the rms signal amplitude to the rms value of the
third harmonic component, reported in dBc.
Integral Nonlinearity
The deviation of the transfer function from a reference line
measured in fractions of 1 LSB using a “best straight line”
determined by a least square curve fit.
PrD 12/19/2000 10:46 AM
ENOB
Power
Fullscale
SNR
MEASURED
10
log
. 1
76
nd
rd
dB
ENCH
V
Fullscale
2
Z
PRELIMINARY TECHNICAL DATA
.
20
001
. 6
in text. At a give clock rate,
Input
log(
02
rms
FullScale
Input
_
_
Amplitude
Amplitude
(cont'd)
)
- 6 -
Minimum Conversion Rate
The encode rate at which the SNR of the lowest analog
signal frequency drops by no more than 3 dB below the
guaranteed limit.
Maximum Conversion Rate
The maximum encode rate at which parametric testing is
performed.
Output Propagation Delay
The delay between a differential crossing of ENCODE and
ENCODE and the time when all output data bits are within
valid logic levels.
Noise (for any range within the ADC)
Where Z is the input impedance, FS is the fullscale of the
device for the frequency in question, SNR is the value for
the particular input level and Signal is the signal level within
the ADC reported in dB below fullscale. This value includes
both thermal and quantization noise.
Power Supply Rejection Ratio
The ratio of a change in input offset voltage to a change in
power supply voltage.
Signal-to-Noise-and-Distortion (SINAD)
The ratio of the rms signal amplitude (set 1dB below full
scale) to the rms value of the sum of all other spectral
components, including harmonics but ex cluding dc.
Signal-to-Noise Ratio (without Harmonics)
The ratio of the rms signal amplitude (set at 1 dB below full
scale) to the rms value of the sum of all other spectral
components, excluding the first five harmonics and dc.
Spurious-Free Dynamic Range (SFDR)
The ratio of the rms signal amplitude to the rms value of the
peak spurious spectral component. The peak spurious
component may or may not be a harmonic. May be reported
in dBc (i.e. degrades as signal level is lowered), or dBFS
(always related back to converter full scale).
Two-Tone Intermodulation Distortion Rejection
The ratio of the rms value of either input tone (f1, f2) to the
rms value of the worst third order intermodulation product;
reported in dBc. Products are located at 2f1-f2 and 2f2-f1.
Two-Tone SFDR
The ratio of the rms value of either input tone (f1, f2) to the
rms value of the peak spurious component. The peak
spurious component may or may not be an IMD product.
May be reported in dBc (i.e. degrades as signal level is
lowered), or in dBFS (always related back to converter full
scale).
Worst Other Spur
The ratio of the rms signal amplitude to the rms value of the
worst spurious component (excluding the 2
harmonic) reported in dBc.
V
noise
Z
. *
001
*
10
FS
dBm
SNR
dBc
10
Signal
nd
dBFS
AD9433
and 3
rd