2

Functional Diagram

Definitions of Specifications

Digital Inputs

The HS-565ARH-T accepts digital input codes in binary

format and may be user connected for any one of three

binary codes. Straight binary, Two’s Complement (see note

below), or Offset Binary, (see Operating Instructions).

Accuracy

Nonlinearity - Nonlinearity of a D/A converter is an

important measure of its accuracy. It describes the deviation

from an ideal straight line transfer curve drawn between zero

(all bits OFF) and full scale (all bits ON).

Differential Nonlinearity - For a D/A converter, it is the

difference between the actual output voltage change and the

ideal (1 LSB) voltage change for a one bit change in code. A

Differential Nonlinearity of

±1 LSB or less guarantees

monotonicity; i.e., the output always increases and never

decreases for an increasing input.

Settling Time

Settling time is the time required for the output to settle to

within the specified error band for any input code transition.

It is usually specified for a full scale or major carry transition,

settling to within 0.50 LSB of final value.

Drift

Gain Drift - The change in full scale analog output over the

specified temperature range expressed in parts per million of

by the respective change in temperature. The specification is

the larger of the two representing worst case drift.

Offset Drift - The change in analog output with all bits OFF

over the specified temperature range expressed in parts per

by the respective change in temperature. The specification

given is the larger of the two, representing worst case drift.

Power Supply Sensitivity

Power Supply Sensitivity is a measure of the change in

gain and offset of the D/A converter resulting from a

change in -15V or +15V supplies. It is specified under DC

conditions and expressed as parts per million of full scale

range per percent of change in power supply (ppm of

FSR/%).

Compliance

Compliance Voltage is the maximum output voltage range

that can be tolerated and still maintain its specified accuracy.

Compliance Limit implies functional operation only and

makes no claims to accuracy.

Glitch

A glitch on the output of a D/A converter is a transient spike

resulting from unequal internal ON-OFF switching times.

Worst case glitches usually occur at half scale or the major

carry code transition from 011 . . . 1 to 100 . . . 0 or vice

versa. For example, if turn ON is greater than turn OFF for

011 . . . 1 to 100 . . . 0, an intermediate state of 000 . . . 0

exists, such that, the output momentarily glitches toward

zero output. Matched switching times and fast switching will

reduce glitches considerably.

43

+

-

19.95K

REF

10V

6

5

REF

+

-

3.5K

3K

0.5mA

PWR

GND

712

24. . . 13

MSB LSB

(4X IREF

X CODE)

GND

IN

20V

SPAN

10V

SPAN

OUT

IO

DAC

9.95K

BIP.

OFF.

8

5K

5K

2.5K

11

10

9

DIGITAL

INPUT

ANALOG OUTPUT

STRAIGHT

BINARY

OFFSET

BINARY

(NOTE)

TWO’S

COMPLEMENT

MSB . LSB

000 . . . 000

Zero

Zero

100 . . . 000

Zero

111 . . . 111

Zero - 1 LSB

011 . . . 111

Zero - 1 LSB

NOTE: Invert MSB with external inverter to obtain Two’s

Complement Coding.

HS-565ARH-T