Advance Information

HIGH TEMPERATURE

12-BIT A/D CONVERTER

HT574

• Down-Hole Oil Well

• Avionics

• Turbine Engine Control

• Industrial Process Control

• Nuclear Reactor

• Electric Power Conversion

• Heavy Duty Internal Combustion Engines

• Specified Over -55 to +225

°C

• Includes On-Chip Clock, Reference,

µP Interface and Sample/Hold

• 11-Bit Linearity

• 10

µs Maximum Conversion, Including Acquisition

• Hermetic 28-Lead Ceramic DIP

FEATURES

APPLICATIONS

GENERAL DESCRIPTION

e

(pitch)

b

(width)

A

S1

b2

Q

L

S2

D

E

1

Right

Reading

on Lid

Ceramic

Body

A

b

b2

C

D

E

e

eA

L

Q

S1

S2

0.175 (max)

0.018 ± 0.002

0.050 (typ)

0.010 to 0.002

1.400 ± 0.014

0.594 ± 0.010

0.100 ±0.005

0.600 ±0.010

0.125 to 0.175

0.050 ±0.010

0.005 (min)

0.005 (min)

All dimensions in inches

eA

C

28-LEAD PACKAGE

The HT574 is a general purpose, 12-bit successive approxi-

mation A/D converter intended for applications with an

extremely wide operating temperature range. Fabricated

with Honeywell’s dielectrically isolated high temperature

(HTMOS™) process, it is designed specifically for severe

high-temperature applications.

The HT574 includes a switched capacitor, digital-to-analog

converter, internal reference, comparator, successive ap-

proximation register, sample and hold, oscillator and archi-

tecture which allows it to be used with minimal external

components. Tristate output buffers and digital control pins

are also provided for microprocessor interfacing. Analog

input signal ranges of 0 to +10V, 0 to +20V, or

±5V may be

selected from the internal resistor scaling network.

The HT574 provides 12-bit conversions in 10

µs over the

entire -55 to +225

°C temperature range. Typically, parts will

operate up to +300

°C for a year, with derated performance.

All parts are burned in at 250

°C to eliminate infant mortality.

Solid State Electronics Center • 12001 State Highway 55, Plymouth, MN 55441 • (800) 323-8295 • http://www.ssec.honeywell.com