EVAL-AD5533EB AD [Analog Devices], EVAL-AD5533EB Datasheet - Page 9

• Manufacturer Part Number: EVAL-AD5533EB
• Description: 32-Channel Precision Infinite Sample-and-Hold
• Manufacturer: AD [Analog Devices]

TERMINOLOGY
V
This is a measure of the maximum deviation from a straight line
passing through the endpoints of the V
function. It is expressed as a percentage of the full-scale span.
Total Unadjusted Error (TUE)
This is a comprehensive specification that includes relative accu-
racy, gain, and offset errors. It is measured by sampling a range
of voltages on V
V
Offset Error
This is a measure of the output error when V
with V
Offset error is a measure of the difference between V
and V
negative. See Figure 5.
Gain Error
This is a measure of the span error of the analog channel. It is
the deviation in slope of the transfer function. See Figure 5. It is
calculated as:
where
Ideal Gain = 3.52
Output Temperature Coefficient
This is a measure of the change in analog output with changes in
temperature. It is expressed in ppm/°C.
REV. A
Ideal Full Scale Output
IN
OUT
to V
to the ideal value. It is expressed in mV.
OUT
IN
OUT
= 70 mV:
V
(ideal). It is expressed in mV and can be positive or
OUT
-
Nonlinearity
Gain Error
Ideal Full Scale Output Offset Error
=
IN
(
Gain
and comparing the measured voltages on
-
×
=
70
=
Actual Full Scale Output
) ((
(
Gain
−
Gain
V
OUT
×
2 96
0V
. ) ((
− ×
-
DEAD BAND
IN
1
LOWER
)
−
versus V
OFFSET
ERROR
V
−
IN
OFFS IN
Gain
= 70 mV. Ideally,
70mV
_
Figure 5. ISHA Transfer Function
− ×
OUT
)
1
−
mV
)
OUT
transfer
V
OFFS IN
(actual)
TRANSFER
FUNCTION
_
IDEAL
)
–9–
ACTUAL
TRANSFER
FUNCTION
DC Power Supply Rejection Ratio
DC Power Supply Rejection Ratio (PSRR) is a measure of
the change in analog output for a change in supply voltage
(V
DC Crosstalk
This is the dc change in the output level of one channel in response
to a full-scale change in the output of all other channels. It is
expressed in µV.
Output Settling Time
This is the time taken from when BUSY goes high to when the
output has settled to ± 0.018%.
Acquisition Time
This is the time taken for the V
length of time that BUSY stays low.
OFFS_IN Settling Time
This is the time taken from a 0 V–3 V step change in input
voltage on OFFS_IN until the output has settled to within ± 0.39%.
Digital Feedthrough
This is a measure of the impulse injected into the analog outputs
from the digital control inputs when the part is not being written
to, i.e., CS/SYNC is high. It is specified in nV-secs and is measured
with a worst-case change on the digital input pins, e.g., from all
0s to all 1s and vice versa.
Output Noise Spectral Density
This is a measure of internally generated random noise. Random
noise is characterized as a spectral density (voltage per root Hertz).
It is measured by acquiring 1.5 V on all channels and measuring
noise at the output. It is measured in nV/√Hz typ.
AC Crosstalk
This is the area of the glitch that occurs on the output of one chan-
nel while another channel is acquiring. It is expressed in nV-secs.
DD
and V
SS
). It is expressed in dBs. V
DEAD BAND
2.96
UPPER
GAIN ERROR +
OFFSET ERROR
3V
V
IN
IN
input to be acquired. It is the
DD
and V
AD5533B
SS
are varied ±5%.