AD5313ARU-REEL7(RevA) 查看數據表（PDF） - Analog Devices

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AD5313ARU-REEL7
(Rev.:RevA)

2.5 V to 5.5 V, 230 μ
A, Dual Rail-to-Rail Voltage Output 8-/10-/12-Bit DACs

Analog Devices 

AD5303/AD5313/AD5323

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 regis-

ter 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 transition (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 the DAC from the digital input pins of the

device, but is measured when the DAC is not being written to

(SYNC held high). It is specified in nV-secs and is measured

with a full-scale change on the digital input pins, i.e., from all 0s

to all 1s and vice versa.

Analog Crosstalk

This is the glitch impulse transferred to the output of one DAC

due to a change in the output of the other 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 output change of

the other 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) while keeping LDAC low

and monitoring the output of the other DAC. The area of the

glitch is expressed in nV-secs.

DC Crosstalk

This is the dc change in the output level of one DAC in response

to a change in the output of the other DAC. It is measured with

a full-scale output change on one DAC while monitoring the

other DAC. It is expressed in µV.

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 mea-

sured in dB. VREF is held at 2 V and VDD is varied ± 10%.

Reference Feedthrough

This is the ratio of the amplitude of the signal at the DAC out-

put to the reference input when the DAC output is not being

updated (i.e., LDAC is high). It is expressed in dB.

Total Harmonic Distortion

This is the difference between an ideal sine wave and its attenuated

version using the DAC. The sine wave is used as the reference

for the DAC and the THD is a measure of the harmonics present

on the DAC output. It is measured in dB.

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 bandwidth is the frequency at which

the output amplitude falls to 3 dB below the input.

Channel-To-Channel Isolation

This is a ratio of the amplitude of the signal at the output of one

DAC to a sine wave on the reference input of the other DAC. It

is measured in dB.

OUTPUT

VOLTAGE

IDEAL

GAIN ERROR

PLUS

OFFSET ERROR

ACTUAL

NEGATIVE

OFFSET

ERROR

DAC CODE

AMPLIFIER

FOOTROOM

(1mV)

NEGATIVE

OFFSET

ERROR

DEADBAND

Figure 3. Transfer Function with Negative Offset

OUTPUT

VOLTAGE

ACTUAL

GAIN ERROR

PLUS

OFFSET ERROR

IDEAL

POSITIVE

OFFSET

ERROR

DAC CODE

Figure 4. Transfer Function with Positive Offset

REV. A

–7–

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