®

6

DAC813

20

10

0

–10

–20

–40

–2

Time (µs)

SETTLING TIME, –10V TO +10V

+5

0

02468

10

12

14

V

OUT

WR

V

OUT

1LSB = 4.88mV

20

10

0

–10

–20

–2

Time (µs)

SETTLING TIME, +10V TO –10V

+5

0

0

2

4

6

8

10

12

1LSB = 4.88mV

V

OUT

WR

DISCUSSION OF

SPECIFICATIONS

INPUT CODES

The DAC813 accepts positive-true binary input codes.

DAC813 may be connected by the user for any one of the

following codes: USB (Unipolar Straight Binary), BOB

(Bipolar Offset Binary) or, using an external inverter on the

MSB line, BTC (Binary Two’s Complement). See Table I.

MONOTONICITY

A D/A converter is monotonic if the output either increases

or remains the same for increasing digital inputs. All grades

of DAC813 are monotonic over their specification tempera-

ture range.

DRIFT

Gain Drift is a measure of the change in the Full Scale Range

(FSR) output over the specification temperature range. Gain

Drift is expressed in parts per million per degree Celsius

(ppm/

°C).

Unipolar Offset Drift is measured with a data input of

Offset Drift is expressed in parts per million of Full Scale

Range per degree Celsius (ppm of FSR/

°C).

The D/A is configured for bipolar output. Bipolar Zero Drift

is expressed in parts per million of Full Scale Range per

degree Celsius (ppm of FSR/

°C).

SETTLING TIME

Settling Time is the total time (including slew time) for the

output to settle within an error band around its final value

after a change in input. Three settling times are specified to

±0.012% of Full Scale Range (FSR): two for maximum full

scale range changes of 20V and 10V, and one for a 1LSB

change. The 1LSB change is measured at the major carry

sition at which worst-case settling time occurs.

REFERENCE SUPPLY

DAC813 contains an on-chip +10V reference. This voltage

(pin 6) has a tolerance of

±50mV. V

nominal value of 500

Ω. The connection can be made through

an optional 1k

Ω trim resistor to provide adjustment to zero

DIGITAL

ANALOG OUTPUT

INPUT

USB

BOB

BTC*

Unipolar

Bipolar

Binary

Straight

Offset

Two’s

MSB to LSB

Binary

Binary

Complement

+ Full Scale

+ Full Scale

Zero – 1LSB

+ 1/2 Full Scale

Zero

– Full Scale

+ 1/2 Full Scale – 1LSB

Zero – 1LSB

+ Full Scale

Zero

– Full Scale

Zero

* Invert MSB of BOB code with external inverter to obtain BTC code.

TABLE I. Digital Input Codes.

LINEARITY ERROR

Linearity error as used in D/A converter specifications by

Burr-Brown is the deviation of the analog output from a

straight line drawn between the end points (inputs all “1s”

and all “0s”). The DAC813 linearity error is specified at

±1/4LSB (max) at +25°C K grades, and ±1/2LSB (max) for

J grades.

DIFFERENTIAL LINEARITY ERROR

Differential linearity error (DLE) is the deviation from a

1LSB output change from one adjacent state to the next. A

DLE specification of 1/2LSB means that the output step size

can range from 1/2LSB to 3/2LSB when the input changes

from one state to the next. Monotonicity requires that DLE

be less than 1LSB over the temperature range of interest.