AD5737 Analog Devices, AD5737 Datasheet - Page 20

• Manufacturer Part Number: AD5737
• Description: Quad Channel, 12-Bit, Serial Input, 4-20mA Output DAC with Dynamic Power Control and HART Connectivity
• Manufacturer: Analog Devices

Specifications of AD5737

• Resolution (bits): 12bit
• Dac Settling Time: 15µs
• Max Pos Supply (v): +33V
• Single-supply: No
• Dac Type: Current Out
• Dac Input Format: Ser,SPI

AD5737
TERMINOLOGY
Relative Accuracy or Integral Nonlinearity (INL)
Relative accuracy, or integral nonlinearity (INL), is a measure
of the maximum deviation from the best fit line through the
DAC transfer function. INL is expressed in percent of full-scale
range (% FSR). A typical INL vs. code plot is shown in Figure 8.
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. The
A typical DNL vs. code plot is shown in Figure 9.
Monotonicity
A DAC is monotonic if the output either increases or remains
constant for increasing digital input code. The
monotonic over its full operating temperature range.
Offset Error
Offset error is the deviation of the analog output from the ideal
zero-scale output when all DAC registers are loaded with 0x0000.
It is expressed in % FSR.
Offset Error Drift or Offset TC
Offset error drift, or offset TC, is a measure of the change in
offset error with changes in temperature and is expressed in
ppm FSR/°C.
Gain Error
Gain error is a measure of the span error of the DAC. It is the
deviation in slope of the DAC transfer function from the ideal,
expressed in % FSR.
Gain Temperature Coefficient (TC)
Gain TC is a measure of the change in gain error with changes
in temperature and is expressed in ppm FSR/°C.
Full-Scale Error
Full-scale error is a measure of the output error when full-scale
code is loaded to the DAC register. Ideally, the output should be
full-scale − 1 LSB. Full-scale error is expressed in % FSR.
Full-Scale Temperature Coefficient (TC)
Full-scale TC is a measure of the change in full-scale error with
changes in temperature and is expressed in ppm FSR/°C.
Total Unadjusted Error (TUE)
Total unadjusted error (TUE) is a measure of the output error
that includes all the error measurements: INL error, offset error,
gain error, temperature, and time. TUE is expressed in % FSR.
DC Crosstalk
DC crosstalk 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, which is at midscale.
AD5737
is guaranteed monotonic by design.
AD5737
is
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Current Loop Compliance Voltage
The current loop compliance voltage is the maximum voltage
at the I
programmed value.
Voltage Reference Thermal Hysteresis
Voltage reference thermal hysteresis is the difference in output
voltage measured at +25°C compared to the output voltage
measured at +25°C after cycling the temperature from +25°C to
−40°C to +105°C and back to +25°C. The hysteresis is specified
for the first and second temperature cycles and is expressed in ppm.
Power-On Glitch Energy
Power-on glitch energy is the impulse injected into the analog
output when the
area of the glitch in nV-sec (see Figure 23).
Power Supply Rejection Ratio (PSRR)
PSRR indicates how the output of the DAC is affected by changes
in the power supply voltage.
Reference Temperature Coefficient (TC)
Reference TC is a measure of the change in the reference output
voltage with changes in temperature. It is expressed in ppm/°C.
Line Regulation
Line regulation is the change in the reference output voltage due
to a specified change in supply voltage. It is expressed in ppm/V.
Load Regulation
Load regulation is the change in the reference output voltage due
to a specified change in load current. It is expressed in ppm/mA.
DC-to-DC Converter Headroom
DC-to-DC converter headroom is the difference between the
voltage required at the current output and the voltage supplied
by the dc-to-dc converter (see Figure 30).
Output Efficiency
Output efficiency is defined as the ratio of the power delivered
to a channel’s load and the power delivered to the channel’s
dc-to-dc input. The V
part of the dc-to-dc converter’s losses.
Efficiency at V
The efficiency at V
delivered to a channel’s V
to the channel’s dc-to-dc input. The V
considered part of the dc-to-dc converter’s losses.
I
I
AV
OUT
OUT
OUT_x
AV
CC
2
CC
×
×
pin for which the output current is equal to the
×
V
×
R
BOOST
AI
AI
LOAD
BOOST_x
CC
AD5737
CC
BOOST_x
_
x
BOOST_x
BOOST_x
is defined as the ratio of the power
is powered on. It is specified as the
quiescent current is considered
supply and the power delivered
BOOST_x
quiescent current is
Data Sheet