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AD7934-6 Datasheet

  • AD7934-6

  • 4-Channel, 625 kSPS, 12-Bit Parallel ADC with a Sequencer

  • 30頁

  • AD

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AD7934-6
TERMINOLOGY
Integral Nonlinearity (INL)
This is the maximum deviation from a straight line passing
through the endpoints of the ADC transfer function. The
endpoints of the transfer function are zero scale, a point 1 LSB
below the first code transition, and full scale, a point 1 LSB
above the last code transition.
Differential Nonlinearity (DNL)
This is the difference between the measured and the ideal 1 LSB
change between any two adjacent codes in the ADC.
Offset Error
This is the deviation of the first code transition (00 鈥?000) to
(00 鈥?001) from the ideal (that is, AGND + 1 LSB).
Offset Error Match
This is the difference in offset error between any two channels.
Gain Error
This is the deviation of the last code transition (111 鈥?110) to
(111 鈥?111) from the ideal (that is, V
REF
鈥?1 LSB) after the
offset error has been adjusted out.
Gain Error Match
This is the difference in gain error between any two channels.
Zero-Code Error
This applies when using the twos complement output coding
option, in particular to the 2 脳 V
REF
input range, with 鈭扸
REF
to
+V
REF
biased about the V
REF
point. It is the deviation of the
midscale transition (all 0s to all 1s) from the ideal V
IN
voltage
(that is, V
REF
).
Zero-Code Error Match
This is the difference in zero-code error between any two
channels.
Positive Gain Error
This applies when using the twos complement output coding
option, in particular to the 2 脳 V
REF
input range, with 鈭扸
REF
to
+V
REF
biased about the V
REF
point. It is the deviation of the last
code transition (011 鈥?110) to (011 鈥?111) from the ideal (that
is, +V
REF
鈥?1 LSB) after the zero-code error has been adjusted out.
Positive Gain Error Match
This is the difference in positive gain error between any two
channels.
Negative Gain Error
This applies when using the twos complement output coding
option, in particular to the 2 脳 V
REF
input range, with 鈭扸
REF
to
+V
REF
biased about the V
REF
point. It is the deviation of the first
code transition (100 鈥?000) to (100 鈥?001) from the ideal
(that is, 鈭扸
REF
+ 1 LSB) after the zero-code error has been
adjusted out.
Negative Gain Error Match
This is the difference in negative gain error between any two
channels.
Channel-to-Channel Isolation
This is a measure of the level of crosstalk between channels.
It is measured by applying a full-scale sine wave signal to the
three, nonselected input channels and applying a 50 kHz signal
to the selected channel. The channel-to-channel isolation is
defined as the ratio of the power of the 50 kHz signal on the
selected channel to the power of the noise signal on the unse-
lected channels that appears in the fast Fourier transform (FFT)
of this channel. The noise frequency on the unselected channels
varies from 40 kHz to 740 kHz. The noise amplitude is at
2 脳 V
REF
, while the signal amplitude is at 1 脳 V
REF
. See Figure 4.
Power Supply Rejection Ratio (PSRR)
PSRR is defined as the ratio of the power in the ADC output at
full-scale frequency (f) to the power of a 100 mV p-p sine wave
applied to the ADC V
DD
supply of frequency
f
S
. The frequency
of the noise varies from 1 kHz to 1 MHz.
PSRR
(dB) = 10log(Pf/Pf
S
)
where:
Pf
is the power at frequency
f
in the ADC output.
Pf
S
is the power at frequency
f
S
in the ADC output.
Common-Mode Rejection Ratio (CMRR)
CMRR is defined as the ratio of the power in the ADC output at
full-scale frequency (f) to the power of a 100 mV p-p sine wave
applied to the common-mode voltage of V
IN+
and V
IN鈭?/div>
of
frequency
f
S
.
CMRR
(dB) = 10log(Pf/Pf
S
)
where:
Pf
is the power at frequency
f
in the ADC output.
Pf
S
is the power at frequency
f
S
in the ADC output.
Rev. A | Page 9 of 28

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