AD667/883B AD [Analog Devices], AD667/883B Datasheet

AD667/883B

Manufacturer Part Number

AD667/883B

Description

Microprocessor-Compatible 12-Bit D/A Converter

Manufacturer

AD [Analog Devices]

Datasheet

1.AD667883B.pdf (8 pages)

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PRODUCT DESCRIPTION

The AD667 is a complete voltage output 12-bit digital-to-analog

converter including a high stability buried Zener voltage refer-

ence and double-buffered input latch on a single chip. The

converter uses 12 precision high speed bipolar current steering

switches and a laser trimmed thin-film resistor network to pro-

vide fast settling time and high accuracy.

Microprocessor compatibility is achieved by the on-chip double-

buffered latch. The design of the input latch allows direct inter-

face to 4-, 8-, 12-, or 16-bit buses. The 12 bits of data from the

first rank of latches can then be transferred to the second rank,

avoiding generation of spurious analog output values. The latch

responds to strobe pulses as short as 100 ns, allowing use with

the fastest available microprocessors.

The functional completeness and high performance in the

AD667 results from a combination of advanced switch design,

high speed bipolar manufacturing process, and the proven laser

wafer-trimming (LWT) technology. The AD667 is trimmed at

the wafer level and is specified to 1/4 LSB maximum linearity

error (K, B grades) at +25 C and 1/2 LSB over the full operat-

ing temperature range.

The subsurface (buried) Zener diode on the chip provides a low

noise voltage reference which has long-term stability and tem-

perature drift characteristics comparable to the best discrete ref-

erence diodes. The laser trimming process which provides the

excellent linearity, is also used to trim the absolute value of the

reference as well as its temperature coefficient. The AD667 is

thus well suited for wide temperature range performance with

ity over the full temperature range. Typical full-scale gain TC is

5 ppm/ C.

*Protected by Patent Numbers 3,803,590; 3,890,611; 3,932,863; 3,978,473;

REV. A

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

4,020,486; and others pending.

1/2 LSB maximum linearity error and guaranteed monotonic-

FEATURES

Complete 12-Bit D/A Function

Single Chip Construction

Monotonicity Guaranteed Over Temperature

Linearity Guaranteed Over Temperature: 1/2 LSB max

Settling Time: 3 s max to 0.01%

Guaranteed for Operation with

Low Power: 300 mW Including Reference

TTL/5 V CMOS Compatible Logic Inputs

Low Logic Input Currents

MIL-STD-883 Compliant Versions Available

Double-Buffered Latch

On Chip Output Amplifier

High Stability Buried Zener Reference

Supplies

12 V or

15 V

The AD667 is available in five performance grades. The

AD667J and K are specified for use over the 0 C to +70 C tem-

(D) or LCC (E) package. The AD667A and B are specified for

use over the –25 C to +85 C temperature range and are avail-

able in a 28-pin hermetically sealed ceramic DIP (D) package.

PRODUCT HIGHLIGHTS

1. The AD667 is a complete voltage output DAC with voltage

2. The double-buffered latch structure permits direct interface

3. The internal buried Zener reference is laser-trimmed to 10.00

4. The gain setting and bipolar offset resistors are matched to

5. The precision high speed current steering switch and on-board

6. The AD667 is available in versions compliant with MIL-

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700

perature range and are available in a 28-pin molded plastic DIP

(N) or PLCC (P) package. The AD667S grade is specified for

the –55 C to +125 C range and is available in the ceramic DIP

reference and digital latches on a single IC chip.

to 4-, 8-, 12-, or 16-bit data buses. All logic inputs are TTL

or 5 volt CMOS compatible.

volts with a 1% maximum error. The reference voltage is

also available for external application.

the internal ladder network to guarantee a low gain tempera-

ture coefficient and are laser-trimmed for minimum full-scale

and bipolar offset errors.

high speed output amplifier settle within 1/2 LSB for a 10 V

full-scale transition in 2.0 s as when properly compensated.

STD-883. Refer to the Analog Devices Military Products

Databook or current AD667/883B data sheet for detailed

specifications.

Microprocessor-Compatible

FUNCTIONAL BLOCK DIAGRAM

12-Bit D/A Converter

AD667*

Fax: 617/326-8703

Related parts for AD667/883B

AD667/883B Summary of contents

Page 1

... LSB for full-scale transition in 2 when properly compensated. 6. The AD667 is available in versions compliant with MIL- STD-883. Refer to the Analog Devices Military Products Databook or current AD667/883B data sheet for detailed specifications. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 ...

Page 2

AD667–SPECIFICATIONS Model DIGITAL INPUTS Resolution Logic Levels (TTL, Compatible, T –T MIN MAX V (Logic “l’’ (Logic “0” 5 0 TRANSFER CHARACTERISTICS ACCURACY Linearity Error ...

Page 3

Model DIGITAL INPUTS Resolution 1 Logic Levels (TTL, Compatible, T –T ) MIN MAX V (Logic “l’’ (Logic “0” 5 0 TRANSFER CHARACTERISTICS ACCURACY Linearity ...

Page 4

... LSB 30 AD667/883B –55 to +125 * * NOTES *Refer to AD667/883B military data sheet. 1 For details on grade and package offerings screened in accordance with MIL-STD- 883, refer to the Analog Devices Military Products Databook or current AD667/ 883B data sheet Ceramic DIP Leadless Ceramic Chip Carrier Plastic DIP; ...

Page 5

ANALOG CIRCUIT CONNECTIONS Internal scaling resistors provided in the AD667 may be connected to produce bipolar output voltage ranges unipolar output voltage ranges ...

Page 6

AD667 Small resistors may be added to the feedback resistors in order to accomplish small modifications in the scaling. For example 10.24 V full scale is desired, a 140 1% low TC metal-film resistor can be added in ...

Page 7

Figure 5. AD667 Block Diagram It is permissible to enable more than one of the latches simulta- neously first rank latch is enabled coincident with the sec- ond rank latch, the data will reach the second rank correctly ...

Page 8

AD667 Right-justified data can be similarly accommodated. The over- lapping of data lines is reversed, and the address connections are slightly different. The AD667 still occupies two adjacent locations in the processor’s memory map. In the circuit of Fig- ure ...

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