7

LTC1659

TI I G DIAGRA

B11

MSB

B10

B1

B0

LSB

B11

CURRENT WORD

CLK

CS/LD

1659 TD

B0

PREVIOUS WORD

B11

PREVIOUS WORD

B10

B1

B0

DEFI ITIO S

Differential Nonlinearity (DNL): The difference between

the measured change and the ideal 1LSB change for any

two adjacent codes. The DNL error between any two codes

is calculated as follows:

DNL = (

Where

two adjacent codes.

Digital Feedthrough: The glitch that appears at the analog

output caused by AC coupling from the digital inputs when

they change state. The area of the glitch is specified in

(nV)(sec).

Full-Scale Error (FSE): The deviation of the actual full-

scale voltage from ideal. FSE includes the effects of offset

and gain errors (see Applications Information).

Integral Nonlinearity (INL): The deviation from a straight

line passing through the endpoints of the DAC transfer

curve (Endpoint INL). Because the output cannot go below

zero, the linearity is measured between full scale and the

lowest code which guarantees the output will be greater

than zero. The INL error at a given input code is calculated

as follows:

the given input code.

Least Significant Bit (LSB): The ideal voltage difference

between two successive codes.

Resolution (n): Defines the number of DAC output states

imply linearity.

output when the DAC is loaded with all zeros. A single

supply DAC can have a true negative offset, but the output

cannot go below zero (see Applications Information).

For this reason, single supply DAC offset is measured at

the lowest code that guarantees the output will be greater

than zero.