AD7933 Analog Devices, AD7933 Datasheet - Page 13

• Manufacturer Part Number: AD7933
• Description: 4-Channel, 1.5 MSPS, 10-Bit Parallel ADC with a Sequencer
• Manufacturer: Analog Devices

Specifications of AD7933

• Resolution (bits): 10bit
• # Chan: 4
• Sample Rate: 1.5MSPS
• Interface: Byte,Par
• Analog Input Type: Diff-Uni,SE-Uni
• Ain Range: (2Vref) p-p,5V p-p,Uni (Vref),Uni (Vref) x 2,Uni 2.5V,Uni 5.0V
• Adc Architecture: SAR
• Pkg Type: SOP

TERMINOLOGY
Integral Nonlinearity (INL)
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, 1 LSB below the first code
transition, and full scale, 1 LSB above the last code transition.
Differential Nonlinearity (DNL)
The difference between the measured and the ideal 1 LSB
change between any two adjacent codes in the ADC.
Offset Error
The deviation of the first code transition (00…000) to (00…001)
from the ideal (that is, AGND + 1 LSB).
Offset Error Match
The difference in offset error between any two channels.
Gain Error
The deviation of the last code transition (111…110) to
(111…111) from the ideal (that is, V
error has been adjusted out.
Gain Error Match
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 × V
+V
midscale transition (all 0s to all 1s) from the ideal V
(that is, V
Zero-Code Error Match
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 × V
biased about the V
code transition (011…110) to (011…111) from the ideal (that is,
+V
Positive Gain Error Match
The difference in positive gain error between any two channels.
REF
REF
– 1 LSB) after the zero-code error has been adjusted out.
biased about the V
REF
).
REFIN
point. It is the deviation of the last
REFIN
point. It is the deviation of the
REF
REF
input range with −V
input range with −V
REF
– 1 LSB) after the offset
IN
REF
voltage
to +V
REF
to
Rev. B | Page 13 of 32
REF
Negative Gain Error
This applies when using the twos complement output coding
option, in particular to the 2 × V
+V
code transition (100…000) to (100…001) from the ideal (that is,
−V
Negative Gain Error Match
The difference in negative gain error between any two channels.
Channel-to-Channel Isolation
Channel-to-channel isolation 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 unselected channels that appears in the FFT
of this channel. The noise frequency on the unselected channels
varies from 40 kHz to 740 kHz. The noise amplitude is at
2 × V
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
of the input varies from 1 kHz to 1 MHz.
where:
Pf is the power at frequency f in the ADC output.
Pf
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
frequency, f
where:
Pf is the power at frequency f in the ADC output.
Pf
S
S
REFIN
REF
is the power at frequency f
is the power at frequency f
PSRR (dB) = 10 log(Pf/Pf
CMRR (dB) = 10 log(Pf/Pf
REF
biased about the V
+ 1 LSB) after the zero-code error has been adjusted out.
, while the signal amplitude is at 1 × V
S
.
DD
supply of frequency, f
REF
point. It is the deviation of the first
S
S
S
)
in the ADC output.
in the ADC output.
S
)
REF
input range with −V
AD7933/AD7934
IN+
and V
S
REF
. The frequency
. See Figure 4.
IN−
of
REF
to