May 1997
ML2258*
µP Compatible 8-Bit A/D Converter
with 8-Channel Multiplexer
GENERAL DESCRIPTION
FEATURES
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.
■ Conversion time
■ Total unadjusted error
■ No missing codes
■ Sample and hold
6.6µs
±1/2LSB or ±1LSB
390ns acquisition
Easy interface to microprocessors is provided by the
latched and decoded multiplexer address inputs and
latched three-state outputs.
■ Capable of digitizing a 5V, 50kHz sine wave
■ 8-input multiplexer
The device is suitable for a wide range of applications
from process and machine control to consumer,
automotive, and telecommunication applications.
■ 0V to 5V analog input range with single 5V
power supply
■ Operates ratiometrically or with up to 5V
voltage reference
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%.
■ No zero-or full-scale adjust required
■ Analog input protection
■ Low power dissipation
25mA per input min
3mA max
■ TTL and CMOS compatible digital inputs and outputs
■ Standard 28-pin DIP or surface mount PCC
■ Superior pin compatible replacement for ADC0808 and
ADC0809
* Some Packages Are End Of Life As Of August 1, 2000
BLOCK DIAGRAM
START
CLOCK
IN0
A/D WITH
SAMPLE HOLD
END OF CONVERSION
(INTERRUPT)
CONTROL & TIMING
IN1
IN2
IN3
8-CHANNEL
MULTIPLEXER
S.A.R.
IN4
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
IN5
COMPARATOR
THREE
STATE
OUTPUT
LATCH
BUFFER
IN6
IN7
SWITCH TREE
ADDR0
ADDRESS
ADDR1
LATCH
AND
ADDR2
CAPACITOR/
RESISTOR
ARRAY
DECODER
ADDRESS
LATCH ENABLE
V
CC
GND +V
–V
REF
OUTPUT
ENABLE
REF
1
MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
