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ADT7317 Datasheet(PDF) 8 Page - Analog Devices |
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ADT7317 Datasheet(HTML) 8 Page - Analog Devices |
8 / 32 page –8– REV. PrN PRELIMINARY TECHNICAL DATA ADT7316/7317/7318 TERMINOLOGY RELATIVE ACCURACY Relative accuracy or integral nonlinearity (INL) is a mea- sure of the maximum deviation, in LSBs, from a straight line passing through the endpoints of the DAC transfer function. Typical INL versus Code plots can be seen in TPCs 1, 2, and 3. DIFFERENTIAL NONLINEARITY Differential Nonlinearity (DNL) is the difference be- tween the measured change and the ideal 1 LSB change between any two adjacent codes. A specified differential nonlinearity of ±1 LSB maximum ensures monotonicity. This DAC and Temperature Sensor ADC is guaranteed monotonic by design. Typical DAC DNL versus Code plots can be seen in TPCs 4, 5, and 6. OFFSET ERROR This is a measure of the offset error of the DAC and the output amplifier. (See Figures 5 and 6.) It can be negative or positive. It is expressed in mV. OFFSET ERROR MATCH This is the difference in Offset Error between any two channels. GAIN ERROR This is a measure of the span error of the DAC. It is the deviation in slope of the actual DAC transfer characteristic from the ideal expressed as a percentage of the full-scale range. GAIN ERROR MATCH This is the difference in Gain Error between any two channels. OFFSET ERROR DRIFT This is a measure of the change in offset error with changes in temperature. It is expressed in (ppm of full- scale range)/°C. GAIN ERROR DRIFT This is a measure of the change in gain error with changes in temperature. It is expressed in (ppm of full- scale range)/°C. DC POWER-SUPPLY REJECTION RATIO (PSRR) This indicates how the output of the DAC is affected by changes in the supply voltage. PSRR is the ratio of the change in VOUT to a change in VDD for full-scale output of the DAC. It is measured in dBs. VREF is held at 2 V and VDD is varied ±10%. DC CROSSTALK This 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. It is expressed in µV. REFERENCE FEEDTHROUGH This is the ratio of the amplitude of the signal at the DAC output to the reference input when the DAC output is not being updated (i.e., LDAC is high). It is expressed in dBs. CHANNEL-TO-CHANNEL ISOLATION This is the ratio of the amplitude of the signal at the out- put of one DAC to a sine wave on the reference input of another DAC. It is measured in dBs. MAJOR-CODE TRANSITION GLITCH ENERGY Major-code transition glitch energy is the energy of the impulse injected into the analog output when the code in the DAC register changes state. It is normally specified as the area of the glitch in nV secs and is measured when the digital code is changed by 1 LSB at the major carry transi- tion (011 . . . 11 to 100 . . . 00 or 100 . . . 00 to 011 . . . 11). DIGITAL FEEDTHROUGH Digital feedthrough is a measure of the impulse injected into the analog output of a DAC from the digital input pins of the device but is measured when the DAC is not being written to the. It is specified in nV secs and is mea- sured with a full-scale change on the digital input pins, i.e., from all 0s to all 1s or vice versa. DIGITAL CROSSTALK This is the glitch impulse transferred to the output of one DAC at midscale in response to a full-scale code change (all 0s to all 1s and vice versa) in the input register of another DAC. It is measured in stand-alone mode and is expressed in nV secs. ANALOG CROSSTALK This is the glitch impulse transferred to the output of one DAC due to a change in the output of another DAC. It is measured by loading one of the input registers with a full- scale code change (all 0s to all 1s and vice versa) while keeping LDAC high. Then pulse LDAC low and monitor the output of the DAC whose digital code was not changed. The area of the glitch is expressed in nV secs. DAC-TO-DAC CROSSTALK This is the glitch impulse transferred to the output of one DAC due to a digital code change and subsequent out- put change of another DAC. This includes both digital and analog crosstalk. It is measured by loading one of the DACs with a full-scale code change (all 0s to all 1s and vice versa) with LDAC low and monitoring the output of another DAC. The energy of the glitch is expressed in nV secs. MULTIPLYING BANDWIDTH The amplifiers within the DAC have a finite bandwidth. The multiplying bandwidth is a measure of this. A sine wave on the reference (with full-scale code loaded to the DAC) appears on the output. The multiplying band- width is the frequency at which the output amplitude falls to 3 dB below the input. |
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