LTC1659IMS8-PBF Просмотр технического описания (PDF) - Linear Technology

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LTC1659IMS8-PBF

12-Bit Rail-to-Rail Micropower DAC in MSOP Package

Linear Technology 

TIMING DIAGRAM

CLK

t9

DIN

B0

PREVIOUS WORD

t1

t2

B11

MSB

CS/LD

t4

B10

t8

DOUT

B11

PREVIOUS WORD

B10

LTC1659

t6

t7

t3

B1

B0

LSB

t5

B11

B1

B0

CURRENT WORD

1659 TD

DEFINITIONS

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 = (ΔVOUT – LSB)/LSB

where ΔVOUT is the measured voltage difference between

two adjacent codes.

Digital Feedthrough: The glitch that appears at the ana-

log 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:

INL = [VOUT – VOS – (VFS – VOS)(code/4095)]/LSB

where VOUT is the output voltage of the DAC measured at

the given input code.

Least Significant Bit (LSB): The ideal voltage difference

between two successive codes.

LSB = VREF/4096

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

(2n) that divide the full-scale range. Resolution does not

imply linearity.

Voltage Offset Error (VOS): Nominally, the voltage at the

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.

1659fa

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