dac-1508a Analog Devices, Inc., dac-1508a Datasheet

dac-1508a

Manufacturer Part Number

dac-1508a

Description

8-bit Multiplying D/a Converters

Manufacturer

Analog Devices, Inc.

Datasheet

1.DAC-1508A.pdf (6 pages)

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SIMPLIFIED SCHEMATIC

switches. For many applications, only a reference resistor

and reference voltage need be added. Improvements in

design and processing techniques provide faster settling

timescombined with lower power consumption while retain~

ingdirect interchangeability with MC1508/1408 devices.

tBurn-in is available on commercial

The DAC-1508A/1408A are a-bit monolithic multiplying

digital-to-analog converters consisting of a reference cur-

rent amplifier, R-2R ladder, and eight high-speed current

:;;devices

GENERAL DESCRIPTION

part number. Consult factory for 883 data sheet.

cerdip, plastic dip, and TO-can packages.

Data Book. Section 2.

ORDERING

: I"'Proved Power Consumption.

f~1URES

l'rC~ .

ACCURACY

RELATIVE

output Voltage Swing

High-Speed Multiplying Input.

I"'proved Direct Replacement

0 19'1\1 Nonlinearity Maximum Over Temperature Range

I"'proved Settling TIme..

compatible with TTL, CMOS Logic

standard Supply Voltages +5.0V and -5.0V to -15V

:to.39%

:to.78%

:to.19%

INFS

' ~ion

processed

Mol1olithics

INFORMATIONt

DAC150SA-SO'

16-PIN DUAL-IN-LINE PACKAGE

MILITARY

in total compliance

HERMETIC

Inc.

and industrial temperature

VREFC-I

VREF(+! 14

. . . .. . . .. .. . . . . .. 250ns, Typ

COMMERCIAL

DAC140SA-SO

DAC140SA-70

DAC140SA-60

For ordering information, see 1988

for MC1508/MC1408

to MIL-STD-SS3. add /SS3 after

. . . . . . . . . . .. .. 4.0mA/ ps

. . . . . . . . ..

MS8

+0.5V to -5.0V

COMMERCIAL

DAC140SA-SP,,/"

DAC140SA-6P

DAC140SA-7P

157mW, Typ

PLASTIC

range parts in

----

11-115

The R-2R ladder divides the reference current into eight

binarily-related components which are fed to the switches. A

remainder current equal to the least significant bit is always

shunted to ground, therefore the maximum output current is

255/256 of the reference amplifier input current. Forexample,

a full-scale output current of 1.992mA would result from a

reference input current of 2.0mA.

The DAC-1508A/1408Ais useful in a wide variety of applica-

tions, including waveform synthesizers, digitally program-

mable gain and attenuation blocks, CRT character genera-

tion, audio digitizing and decoding, stepping motor drives,

programmable power supplies and in building tracking and

successive approximation analog-to-digital converters.

your attention is directed to the DAC-Daa-bit high-speed

which include precision voltage references on the chip,

For significantly improved speed and applications flexibility

multiplying D/A converter data sheet. For D/A converters,

please refer to the DAC-210or the DAC-100data sheet.

PIN CONNECTIONS

MSBAI 15

IJJl4:-1S08Jl/1408Jl

LSB

'61

COMPENSATION

GNQ

COMPEN

16-PIN DUAL-IN-LiNE

8-BIT MULTIPLYING

D/ A CONVERTERS

HERMETIC (0)

EPOXY (P)

PACKAGE

8/87, Rev. A1

III

;>-

Related parts for dac-1508a

dac-1508a Summary of contents

Page 1

... Forexample, 157mW, Typ a full-scale output current of 1.992mA would result from a reference input current of 2.0mA. The DAC-1508A/1408Ais useful in a wide variety of applica- +0.5V to -5.0V tions, including waveform synthesizers, digitally program- mable gain and attenuation blocks, CRT character genera- ...

Page 2

... Ceramic Package (orEpoxyB Package) DerateaboveTA='+25°C ELECTRICAL CHARACTERISTICS DAC-15D8A-8. D oC:5TA:5+75°C for DAC-14D8A, u nless otherwise noted. All digital inputs at logic high level. PARAMETER SYMBOL Relative Accuracy lerror relative to Full-Scale 101 DAC-1508A-B, DAC-1408A-8 DAC-1408A-7 'E, DAC-1408A-6 SettlingTime to within 1/2 LSB ts lincludes tpLHI Propagation Delay Time ...

Page 3

... TYPICAL ELECTRICAL CHARACTERISTICS = 2mA, unless otherwise noted. Output characteristics refer to lOUTonly. IREF SYMBOL PARAMETER dl/dt Reference Input Slew Rate Propagation Delay tPLH' tpHL ts Settling Time DAC-150aA/140aA a-BIT MULTIPLYING D/A CONVERTERS 1. N.C. 2. GROUND 3. VEE 4. (MSB For additional to 1988 Data Book, Section x 0 ...

Page 4

... R14"R15 NY-- :3 R15 DAC-I508A/ A4 DAC-I408A 9 A5 0-- -: 101 SEE C TEXT 3 FOR VALUES OFC VEE DAC-1508A/1408A 8-BIT MULTIPLYINGD/A CONVERTERS MSB 12-8IT A4 D-TOA- CONVERTER AS ItO.OI% ERROR MAX VREF'" 2V VCC R14 950fJ 14 13 MSB DAC-I508A/ ...

Page 5

... The voltage on Pin 4 is restricted to a range of -0.6V to +0.5V when VEE employed in the DAC-1508A-8. The negative output voltage compliance of the DAC-1508A extended to -5.0V where the negative supply voltage is more negative than -10V. Using a full-scale current of 1.992mAand load resistor of 2.5kn between Pin 4 and ground will yield a voltage output of 256 levels between 0 and -4 ...

Page 6

... The reference current may drift with temperature, causing a change in the absolute accuracy of output current. However, the DAC-1508A-8 has a very low full-scale current drift with temperature. The DAC-1508A-8/DAC-1408A series is guaranteed accurate to within :t 1/2 LSB at a full-scale output current of 1.992mA. ...

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