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ADC0809CCV

µP Compatible 8-Bit A/D Converter with 8-Channel Multiplexer

Micro Linear Corporation 

May 1997

ML2258*

µP Compatible 8-Bit A/D Converter

with 8-Channel Multiplexer

GENERAL DESCRIPTION

The ML2258 combines an 8-bit A/D converter, 8-channel

analog multiplexer, and a microprocessor compatible 8-

bit parallel interface and control logic in a single

monolithic device.

Easy interface to microprocessors is provided by the

latched and decoded multiplexer address inputs and

latched three-state outputs.

The device is suitable for a wide range of applications

from process and machine control to consumer,

automotive, and telecommunication applications.

The ML2258 is an enhanced, pin-compatible, second

source for the industry standard ADC0808/ADC0809. The

ML2258 enhancements are faster conversion time, true

sample and hold function, superior power supply

rejection, wider reference range, and a double buffered

data bus as well as faster digital timing. All parameters

are guaranteed over temperature with a power supply

voltage of 5V ±10%.

BLOCK DIAGRAM

FEATURES

s Conversion time

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 sine wave

s 8-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 Low power dissipation

3mA max

s TTL and CMOS compatible digital inputs and outputs

s Standard 28-pin DIP or surface mount PCC

s Superior pin compatible replacement for ADC0808 and

ADC0809

* Some Packages Are End Of Life As Of August 1, 2000

START CLOCK

IN0

IN1

IN2

IN3

8-CHANNEL

MULTIPLEXER

IN4

IN5

IN6

IN7

ADDR0

ADDR1

ADDR2

ADDRESS

LATCH ENABLE

ADDRESS

LATCH

AND

DECODER

A/D WITH

SAMPLE HOLD

CONTROL & TIMING

COMPARATOR

S.A.R.

SWITCH TREE

CAPACITOR/

RESISTOR

ARRAY

END OF CONVERSION

(INTERRUPT)

THREE

STATE

OUTPUT

LATCH

BUFFER

DB0

DB1

DB2

DB3

DB4

DB5

DB6

DB7

VCC GND +VREF

–VREF OUTPUT

ENABLE

1

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