AD5532-3 AD [Analog Devices], AD5532-3 Datasheet - Page 9

• Manufacturer Part Number: AD5532-3
• Description: 32-Channel, 14-Bit Voltage-Output DAC
• Manufacturer: AD [Analog Devices]

TERMINOLOGY
DAC MODE
Integral Nonlinearity (INL)
This is a measure of the maximum deviation from a straight line
passing through the endpoints of the DAC transfer function. It
is expressed as a percentage of full-scale span.
Differential Nonlinearity (DNL)
Differential Nonlinearity (DNL) is the difference between the
measured change and the ideal 1 LSB change between any two
adjacent codes. A specified DNL of ± 1 LSB maximum ensures
monotonicity.
Offset
Offset is a measure of the output with all zeros loaded to the
DAC and OFFS_IN = 0. Since the DAC is lifted off the ground
by approximately 50 mV, this output will typically be:
Full-Scale Error
This is a measure of the output error with all 1s loaded to the
DAC. It is expressed as a percentage of full-scale range. See Fig-
ure 6. It is calculated as:
where
Output Settling Time
This is the time taken from when the last data bit is clocked into
the DAC until the output has settled to within ± 0.39%.
OFFS_IN Settling Time
This is the time taken from a 0 V–3 V step change in input volt-
age on OFFS_IN until the output has settled to within ±0.39%.
Digital-to-Analog Glitch Impulse
This is the area of the glitch injected into the analog output when
the code in the DAC register changes state. It is specified as the
area of the glitch in nV-secs 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 Crosstalk
This is the glitch impulse transferred to the output of one DAC
at midscale while a full-scale code change (all 1s to all 0s and vice
versa) is being written to another DAC. It is expressed in nV-secs.
Analog Crosstalk
This the area of the glitch transferred to the output (V
one DAC due to a full-scale change in the output (V
another DAC. The area of the glitch is expressed in nV-secs.
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 mea-
sured with a worst-case change on the digital input pins, e.g.,
from all 0s to all 1s and vice versa.
Ideal Gain = 3.52 for AD5532-1/-3/-5
Ideal Gain = 7 for AD5532-2
Full-Scale Error = V
V
OUT
OUT(Full-Scale)
= Gain × 50 mV
– (Ideal Gain × REFIN)
OUT
OUT
) of
) of
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 loading all DACs to midscale and measur-
ing noise at the output. It is measured in nV/(√Hz)
Output Temperature Coefficient
This is a measure of the change in analog output with changes
in temperature. It is expressed in ppm/°C.
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
V
DC Crosstalk
This the DC change in the output level of one DAC at midscale
in response to a full-scale code change (all 0s to all 1s and vice
versa) and output change of all other DACs. It is expressed in µV.
SHA MODE
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.
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 7.
Gain Error
This is a measure of the span error of the analog channel. It is
the deviation in slope of the transfer function expressed in mV.
See Figure 7. It is calculated as:
Gain Error = Actual Full-Scale Output – Ideal Full-Scale Output –
Offset Error
where
AC Crosstalk
This is the area of the glitch that occurs on the output of one
channel while another channel is acquiring. It is expressed in
nV-secs.
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.
Ideal Full-Scale Output = Gain × 2.96 – ((Gain – 1) × V
IN
SS
). It is expressed in dBs. V
to V
OUT
IN
V
OUT
= 70 mV:
OUT
(ideal). It is expressed in mV and can be positive or
Nonlinearity
= (Gain × 70) – ((Gain – 1) × V
DD
IN
and V
input to be acquired. It is the
IN
SS
versus V
are varied ± 5%.
IN
OFFS_IN
= 70 mV. Ideally,
AD5532
OUT
1/2
OUT
) mV
.
transfer
(actual)
OFFS_IN
DD
and
)