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| 型號： | AD7621ACP |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 16-Bit, 1 LSB INL, 3 MSPS PulSAR ADC |
| 中文描述： | 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, QCC48 |
| 封裝： | MO-220-VKKD-2, LFCSP-48 |
| 文件頁數(shù)： | 10/26頁 |
| 文件大小： | 265K |
| 代理商： | AD7621ACP |
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REV. Pr D
PRELIMINARY TECHNICAL DATA
AD7621
–10–
DEFINITION OF SPECIFICATIONS
Integral nonlinearity error (INL)
Linearity error refers to the deviation of each individual
code from a line drawn from “negative full scale” through
“positive full scale”. The point used as “negative full
scale” occurs 1/2 LSB before the first code transition.
“Positive full scale” is defined as a level 1 1/2 LSB be-
yond the last code transition. The deviation is measured
from the middle of each code to the true straight line.
Differential nonlinearity error (DNL)
In an ideal ADC, code transitions are 1 LSB apart. Differ-
ential nonlinearity is the maximum deviation from this
ideal value. It is often specified in terms of resolution for
which no missing codes are guaranteed.
Gain error
The first transition (from 000 . . . 00 to 000 . . . 01) should
occur for an analog voltage 1/2 LSB above the nominal –
full scale (-2.047962 V for the ±2.048V range). The last
transition (from 111 . . . 10 to 111 . . . 11) should occur for
an analog voltage 1 1/2 LSB below the nominal full scale
(2.047886 V for the ±2.048V range). The gain error is the
deviation of the difference between the actual level of the
last transition and the actual level of the first transition
from the difference between the ideal levels.
Zero error
The zero error is the difference between the ideal midscale
input voltage (0 V) and the actual voltage producing the
midscale output code.
Spurious free dynamic range (SFDR)
The difference, in decibels (dB), between the rms ampli-
tude of the input signal and the peak spurious signal.
Effective number of bits (ENOB)
ENOB is a measurement of the resolution with a sine
wave input. It is related to S/(N+D) by the following for-
mula:
ENOB = (S/[N+D]
dB
– 1.76)/6.02)
and is expressed in bits.
Total harmonic distortion (THD)
THD is the ratio of the rms sum of the first five harmonic
components to the rms value of a full-scale input signal
and is expressed in decibels.
Dynamic range
Dynamic range is the ratio of the rms value of the full
scale to the rms noise measured with the inputs shorted
together. The value for dynamic range is expressed in
decibels.
Signal-to-noise ratio (SNR)
SNR is the ratio of the rms value of the actual input signal
to the rms sum of all other spectral components below the
Nyquist frequency, excluding harmonics and dc. The value
for SNR is expressed in decibels.
Signal to (noise + distortion) ratio (S/[N+D])
S/(N+D) is the ratio of the rms value of the actual input
signal to the rms sum of all other spectral components
below the Nyquist frequency, including harmonics but
excluding dc. The value for S/(N+D) is expressed in
decibels.
Aperture delay
Aperture delay is a measure of the acquisition perfor-
mance and is measured from the falling edge of the
CNVST
input to when the input signal is held for a con-
version.
Transient response
The time required for the AD7621 to achieve its rated
accuracy after a full-scale step function is applied to its
input.
Reference Voltage Temperature Coefficient
The change of the internal reference output voltage V
over the operating temperature range and normalized by
the output voltage at 25°C, expressed in ppm/°C. The
equation follows:
V T
V
(
°
25
where
V(25°C)
= V at 25°C
V(T
2
)
= V at Temperature 2
V(T
1
)
= V at Temperature 1
TCV ppm
(
C
°
V( )
T
C
T
/
)
(
)
) (
)
=
×
2
2
1
6
10
Reference Voltage Long-Term Stability
Typical shift of output voltage at 25°C on a sample of
parts subjected to operation life test of 1000 hours at
125°C:
V t
V t
V t
( )
where
V(t
0
) = V at 25°C at Time 0
V(t
1
) = V at 25°C after 1,000 hours operation at 125°C
V ppm
(
)
( )
( )
=
×
6
10
Reference Voltage Thermal Hysteresis
Thermal hysteresis is defined as the change of output
voltage after the device is cycled through temperature
from +25°C to –40°C to +125°C and back to +25°C.
This is a typical value from a sample of parts put through
such a cycle
V
V
V
C
(
)
°
25
where
V(25°C) = V at 25°C
V
TC
= V at 25°C after temperature cycle at +25°C to
–40°C to +125°C and back to +25°C
V
ppm
C
°
HYS
TC
(
)
(
)
=
×
25
10
6
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