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参数资料
| 型号： | AD5328 |
| 厂商： | Analog Devices, Inc. |
| 英文描述： | Dual-Channel 14bit, 65MSPS Analog-to-Digital Converter 80-HTQFP -40 to 85 |
| 中文描述： | 2.5 V至5.5 V电压输出8-/10-/12-Bit八路数模转换器的16引脚TSSOP |
| 文件页数： | 6/19页 |
| 文件大小： | 308K |
| 代理商： | AD5328 |
REV. B
–6–
AD5308/AD5318/AD5328
TERMINOLOGY
Relative Accuracy
For the DAC, relative accuracy or integral nonlinearity (INL) is
a measure of the maximum deviation, in LSB, from a straight
line passing through the endpoints of the DAC transfer function.
Typical INL versus code plots can be seen in TPCs 1, 2, and 3.
Differential Nonlinearity
Differential nonlinearity (DNL) is the difference between the
measured change and the ideal 1 LSB change between any two
adjacent codes. A specified differential nonlinearity of
±
1 LSB
maximum ensures monotonicity. This DAC is guaranteed
monotonic by design. Typical DNL versus code plots can be
seen in TPCs 4, 5, and 6.
Offset Error
This is a measure of the offset error of the DAC and the output
amplifier (see Figures 2 and 3). It can be negative or positive,
and is expressed in mV.
Gain Error
This is a measure of the span error of the DAC. It is the devia-
tion in slope of the actual DAC transfer characteristic from the
ideal expressed as a percentage of the full-scale range.
Offset Error Drift
This is a measure of the change in offset error with changes in
temperature. It is expressed in (ppm of full-scale range)/
°
C.
Gain Error Drift
This is a measure of the change in gain error with changes in
temperature. It is expressed in (ppm of full-scale range)/
°
C.
DC Power Supply Rejection Ratio (PSRR)
This indicates how the output of the DAC is affected by changes
in the supply voltage. PSRR is the ratio of the change in V
OUT
to a change in V
DD
for full-scale output of the DAC. It is mea-
sured in dB. V
REF
is held at 2 V and V
DD
is varied
±
10%.
DC Crosstalk
This is the dc change in the output level of one DAC in response
to a change in the output of another DAC. It is measured with a
full-scale output change on one DAC while monitoring another
DAC. It is expressed in
μ
V.
Reference Feedthrough
This is the ratio of the amplitude of the signal at the DAC out-
put to the reference input when the DAC output is not being
updated (i.e.,
LDAC
is high). It is expressed in dB.
Channel-to-Channel Isolation
This is the ratio of the amplitude of the signal at the output of
one DAC to a sine wave on the reference input of another DAC.
It is measured in dB.
Major-Code Transition Glitch Energy
Major-code transition glitch energy is the energy of the impulse
injected into the analog output when the code in the DAC
register changes state. It is normally specified as the area of the
glitch in nV-s and is measured when the digital code is changed by
1 LSB at the major carry transition (011 . . . 11 to 100 . . . 00 or
100 . . . 00 to 011 . . . 11).
Digital Feedthrough
Digital feedthrough is a measure of the impulse injected into the
analog output of a DAC from the digital input pins of the device,
but is measured when the DAC is not being written to (
SYNC
held high). It is specified in nV-s and is measured with a full-
scale change on the digital input pins, i.e., from all 0s to all 1s
and vice versa.
Digital Crosstalk
This is the glitch impulse transferred to the output of one DAC
at midscale in response to a full-scale code change (all 0s to all
1s and vice versa) in the input register of another DAC. It is
measured in standalone mode and is expressed in nV-s.
Analog Crosstalk
This is the glitch impulse transferred to the output of one DAC
due to a change in the output of another DAC. It is measured
by loading one of the input registers with a full-scale code change
(all 0s to all 1s and vice versa) while keeping
LDAC
high. Then
pulse
LDAC
low and monitor the output of the DAC whose
digital code was not changed. The area of the glitch is expressed
in nV-s.
DAC-to-DAC Crosstalk
This is the glitch impulse transferred to the output of one DAC
due to a digital code change and subsequent output change of
another DAC. This includes both digital and analog crosstalk. It
is measured by loading one of the DACs with a full-scale code
change (all 0s to all 1s and vice versa) with
LDAC
low and
monitoring the output of another DAC. The energy of the glitch
is expressed in nV-s.
Multiplying Bandwidth
The amplifiers within the DAC have a finite bandwidth. The
multiplying bandwidth is a measure of this. A sine wave on the
reference (with full-scale code loaded to the DAC) appears on
the output. The multiplying bandwidth is the frequency at
which the output amplitude falls to 3 dB below the input.
Total Harmonic Distortion
This is the difference between an ideal sine wave and its attenuated
version using the DAC. The sine wave is used as the reference
for the DAC, and the THD is a measure of the harmonics present
on the DAC output. It is measured in dB.
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