ML2259BCQ datasheet(1/13 Pages) MICRO-LINEAR

Nome de Peças	ML2259BCQ

Descrição Electrónicos	關P Compatible 8-Bit A/D Converters with 2- or 8-Channel Multiplexer

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Fabricante Electrônico	MICRO-LINEAR [Micro Linear Corporation]

Página de início	http://www.microlinear.com

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May 1997

ML2252*, ML2259**

µP Compatible 8-Bit A/D Converters

with 2- or 8-Channel Multiplexer

GENERAL DESCRIPTION

The ML2252 and ML2259 combine an 8-bit A/D

converter, 2- or 8-channel analog multiplexer, and a

microprocessor compatible 8-bit parallel interface and

control logic in a single monolithic CMOS device.

Easy interface to microprocessors is provided by the

latched and decoded multiplexer address inputs and a

double buffered three-state data bus. These analog-to-

digital converters allow the microprocessor to operate

completely asynchronous to the converter clock.

The built in sample and hold function provides the ability

to digitize a 5V, 50kHz sinewave to 8-bit accuracy. The

differential comparator design provides low power supply

sensitivity to DC and AC variations. The voltage reference

can be externally set to any value between ground and

VCC, thus allowing a full conversion over a relatively

small span. All parameters are guaranteed over

temperature with a power supply voltage of 5V ±10%.

The device is suitable for a wide range of applications

from process and machine control to consumer,

automotive, and telecommunication applications.

FEATURES

s

Conversion time (fCLK = 1.46MHz); 6.6µs

s

Total unadjusted error; ±1/2LSB or ±1LSB

s

No missing codes

s

Sample and hold; 390ns acquisition

s

Capable of digitizing a 5V, 50kHz sinewave

s

2- or 8-channel input multiplexer

s

0V to 5V analog input range with single 5V

power supply

s

Operates ratiometrically or with up to 5V

voltage reference

s

No zero or full scale adjust required

s

Analog input protection; 25mA per input min

s

Continuous conversion mode

s

Low power dissipation; 15mW max

s

TTL and CMOS compatible digital inputs and outputs

ML2252 BLOCK DIAGRAM

CONTROL

& TIMING

2-CHANNEL

MULTIPLEXER

ADDRESS

LATCH

AND

DECODER

THREE

STATE

OUTPUT

BUFFER

SUCCESSIVE

APPROXIMATION

REGISTER

D/A

CONVERTER

VCC

A/D WITH

SAMPLE-AND-HOLD FUNCTION

8pF

Σ

CLOCK

+

–

DB7

COMP

CH0

CH1

ALE

A0

GND

+VREF

–VREF

DB6

DB5

DB4

DB3

DB2

DB1

DB0

EOC

START

OE

1

* This Part Is Obsolete

** This Part Is End of Life As Of August 1, 2000

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