DAC8562SDSCT Datasheet, PDF (44/58 Pages) Texas Instruments – DUAL 16-/14-/12-BIT, ULTRALOW-GLITCH, LOW-POWER, BUFFERED, VOLTAGE-OUTPUT DAC WITH 2.5-V, 4-PPM/°C INTERNAL REFERENCE IN SMALL 3-MM × 3-MM SON

DAC8562, DAC8563
DAC8162, DAC8163
DAC7562, DAC7563
SLAS719D – AUGUST 2010 – REVISED AUGUST 2012
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PARAMETER DEFINITIONS
With the increased complexity of many different specifications listed in product data sheets, this section
summarizes selected specifications related to digital-to-analog converters.
STATIC PERFORMANCE
Static performance parameters are specifications such as differential nonlinearity (DNL) or integral nonlinearity
(INL). These are dc specifications and provide information on the accuracy of the DAC. They are most important
in applications where the signal changes slowly and accuracy is required.
Differential Nonlinearity (DNL)
Differential nonlinearity (DNL) is defined as the maximum deviation of the real LSB step from the ideal 1 LSB
step. Ideally, any two adjacent digital codes correspond to output analog voltages that are exactly one LSB apart.
If the DNL is less than 1 LSB, the DAC is said to be monotonic.
Full-Scale Error
Full-scale error is defined as the deviation of the real full-scale output voltage from the ideal output voltage while
the DAC register is loaded with the full-scale code (0xFFFF). Ideally, the output should be V_REF – 1 LSB or
2 × V_REF – 1 LSB, depending on the DAC voltage gain. The full-scale error is expressed in percent of full-scale
range (% FSR).
Full-Scale Error Drift
Full-scale error drift is defined as the change in full-scale error with a change in temperature. Full-scale error drift
is expressed in units of ppm of FSR/°C.
Full-Scale Range (FSR)
Full-scale range (FSR) is the difference between the maximum and minimum analog output values that the DAC
is specified to provide; typically, the maximum and minimum values are also specified. For an n-bit DAC, these
values are usually given as the values matching with code 0 and 2ⁿ – 1.
Gain Error
Gain error is defined as the deviation in the slope of the real DAC transfer characteristic from the ideal transfer
function. Gain error is expressed as a percentage of full-scale range (% FSR).
Gain Temperature Coefficient
The gain temperature coefficient is defined as the change in gain error with changes in temperature. The gain
temperature coefficient is expressed in ppm of FSR/°C.
Least-Significant Bit (LSB)
The least significant bit (LSB) is defined as the smallest value in a binary coded system. The value of the LSB
can be calculated by dividing the full-scale output voltage by 2ⁿ, where n is the resolution of the converter.
Monotonicity
Monotonicity is defined as a slope whose sign does not change. If a DAC is monotonic, the output changes in
the same direction or remains constant for each step increase (or decrease) in the input code.
Most-Significant Bit (MSB)
The most significant bit (MSB) is defined as the largest value in a binary coded system. The value of the MSB
can be calculated by dividing the full-scale output voltage by 2. Its value is one-half of full-scale.
Offset Error
The offset error is defined as the difference between actual output voltage and the ideal output voltage in the
linear region of the transfer function. This difference is calculated by using a straight line defined by two codes
(code 512 and code 65,024). Because the offset error is defined by a straight line, it can have a negative or
positive value. Offset error is measured in mV.
Offset Error Drift
Offset error drift is defined as the change in offset error with a change in temperature. Offset error drift is
expressed in µV/°C.
Power-Supply Rejection Ratio (PSRR)
Power-supply rejection ratio (PSRR) is defined as the ratio of change in output voltage to a change in supply
voltage for a full-scale output of the DAC. The PSRR of a device indicates how the output of the DAC is affected
by changes in the supply voltage. PSRR is measured in decibels (dB).
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