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ML2252 Datasheet(PDF) 1 Page - Micro Linear Corporation

Part No. ML2252
Description  μP Compatible 8-Bit A/D Converters with 2- or 8-Channel Multiplexer
Download  13 Pages
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Maker  MICRO-LINEAR [Micro Linear Corporation]
Homepage  http://www.microlinear.com
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ML2252 Datasheet(HTML) 1 Page - Micro Linear Corporation

 
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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
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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