DAC8564IBPW datasheet(41/51 Pages) TI1

41 / 51 page

DAC8564

www.ti.com

SBAS403D

– JUNE 2007 – REVISED MAY 2011

PARAMETER DEFINITIONS

With the increased complexity of many different

Full-Scale Error

specifications listed in product data sheets, this

section summarizes selected specifications related to

Full-scale error is defined as the deviation of the real

digital-to-analog converters.

full-scale output voltage from the ideal output voltage

while the DAC register is loaded with the full-scale

STATIC PERFORMANCE

code (0xFFFF). Ideally, the output should be VDD – 1

LSB. The full-scale error is expressed in percent of

Static performance parameters are specifications

full-scale range (%FSR).

such as differential nonlinearity (DNL) or integral

nonlinearity (INL). These are dc specifications and

Offset Error

provide information on the accuracy of the DAC. They

are most important in applications where the signal

The offset error is defined as the difference between

changes slowly and accuracy is required.

actual output voltage and the ideal output voltage in

the linear region of the transfer function. This

Resolution

difference is calculated by using a straight line

defined by two codes (code 485 and 64714). Since

Generally, the DAC resolution can be expressed in

the offset error is defined by a straight line, it can

different forms. Specifications such as IEC 60748-4

have a negative or positive value. Offset error is

recognize

the

numerical,

analog,

and

relative

measured in mV.

resolution. The numerical resolution is defined as the

number of digits in the chosen numbering system

Zero-Code Error

necessary to express the total number of steps of the

transfer characteristic, where a step represents both

The zero-code error is defined as the DAC output

a digital input code and the corresponding discrete

voltage, when all '0's are loaded into the DAC

analogue output value. The most commonly-used

definition of resolution provided in data sheets is the

difference between actual output voltage and ideal

numerical resolution expressed in bits.

output voltage (0V). It is expressed in mV. It is

primarily caused by offsets in the output amplifier.

Least Significant Bit (LSB)

Gain Error

The least significant bit (LSB) is defined as the

smallest value in a binary coded system. The value of

Gain error is defined as the deviation in the slope of

the LSB can be calculated by dividing the full-scale

the real DAC transfer characteristic from the ideal

output voltage by 2n, where n is the resolution of the

transfer function. Gain error is expressed as a

converter.

percentage of full-scale range (%FSR).

Most Significant Bit (MSB)

Full-Scale Error Drift

The most significant bit (MSB) is defined as the

Full-scale error drift is defined as the change in

largest value in a binary coded system. The value of

full-scale

error

with

change

temperature.

the MSB can be calculated by dividing the full-scale

Full-scale

error

drift

expressed

units

output voltage by 2. Its value is one-half of full-scale.

of %FSR/

°C.

Relative Accuracy or Integral Nonlinearity (INL)

Offset Error Drift

Relative accuracy or integral nonlinearity (INL) is

Offset error drift is defined as the change in offset

defined as the maximum deviation between the real

error with a change in temperature. Offset error drift

transfer function and a straight line passing through

is expressed in

μV/°C.

the endpoints of the ideal DAC transfer function. DNL

is measured in LSBs.

Zero-Code Error Drift

Zero-code error drift is defined as the change in

Differential Nonlinearity (DNL)

zero-code error with a change in temperature.

Differential nonlinearity (DNL) is defined as the

Zero-code error drift is expressed in

μV/°C.

maximum deviation of the real LSB step from the

ideal 1LSB step. Ideally, any two adjacent digital

codes correspond to output analog voltages that are

exactly one LSB apart. If the DNL is less than 1LSB,

the DAC is said to be monotonic.

DAC8564IBPW 数据表(PDF) 41 Page - Texas Instruments

DAC8564IBPW 数据表(HTML) 41 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

数据表下载