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ML2252 View Datasheet(PDF) - Micro Linear Corporation

Part NameDescriptionManufacturer
ML2252 P Compatible 8-Bit A/D Converters with 2- or 8-Channel Multiplexer Micro-Linear
Micro Linear Corporation Micro-Linear
ML2252 Datasheet PDF : 13 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
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.
ML2252 BLOCK DIAGRAM
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
* This Part Is Obsolete
** This Part Is End of Life As Of August 1, 2000
VCC
CH0
2-CHANNEL
CH1 MULTIPLEXER
ADDRESS
LATCH
AND
DECODER
ALE A0
CLOCK
CONTROL
& TIMING
+
Σ
8pF
+
COMP
SUCCESSIVE
APPROXIMATION
REGISTER
8pF
A/D WITH
SAMPLE-AND-HOLD FUNCTION
GND
D/A
CONVERTER
+VREF
–VREF
START
EOC
DB0
DB1
DB2
THREE
STATE
OUTPUT
BUFFER
DB3
DB4
DB5
DB6
DB7
OE
1
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