AD7398BRU-REEL7 View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

AD7398BRU-REEL7

Quad, Serial-Input 12-Bit/10-Bit DACs

Analog Devices 

TERMINOLOGY

Relative Accuracy (INL)

For the DAC, relative accuracy or integral nonlinearity (INL) is

a measure of the maximum deviation, in LSBs, from a straight

line passing through the endpoints of the DAC transfer function.

Figure 6 illustrates a typical INL vs. code plot.

Differential Nonlinearity (DNL)

Differential nonlinearity is the difference between the measured

change and the ideal 1 LSB change between any two adjacent

codes. A specified differential nonlinearity of ±1 LSB maximum

ensures monotonicity. Figure 8 illustrates a typical DNL vs.

code plot.

Zero-Scale Error (VZSE)

Zero-scale error is a measure of the output voltage error from

zero voltage when zero code is loaded to the DAC register.

Full-Scale Error (VFSE)

Full-scale error is a measure of the output voltage error from

full-scale voltage when full-scale code is loaded to the DAC

register.

Full-Scale Temperature Coefficient (TCVFS)

This is a measure of the change in full-scale error with a change

in temperature. It is expressed in ppm/°C or mV/°C.

AD7398/AD7399

DAC Glitch Impulse (Q)

Digital-to-analog glitch impulse is the impulse injected into the

analog output when the input code in the DAC register changes

state. It is normally specified as the area of the glitch in nV −s and

is measured when the digital input code is changed by 1 LSB at the

major carry transition (midscale transition). A plot of the glitch

impulse is shown in Figure 15.

Digital Feedthrough (QDF)

Digital feedthrough is a measure of the impulse injected into

the analog output of the DAC from the digital inputs of the

DAC, but is measured when the DAC output is not updated. CS

is held high while the CLK and SDI signals are toggled. It is

specified in nV − s, and is measured with a full-scale code change

on the data bus, such as from all 0s to all 1s and vice versa. A

typical plot of digital feedthrough is shown in Figure 16.

Power Supply Sensitivity (PSS)

This specification indicates how the output of the DAC is

affected by changes in the power supply voltage. Power supply

sensitivity is quoted in terms of % change in output per % change

in VDD for full-scale output of the DAC. VDD is varied by ±10%.

Reference Feedthrough (VOUT/VREF)

This is a measure of the feedthrough from the VREF input to the

DAC output when the DAC is loaded with all 0s. A 100 kHz,

1 V p-p is applied to VREF. Reference feedthrough is expressed in

dB or mV p-p.

Rev. C | Page 9 of 24

Share Link: