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ML2281 Datasheet(PDF) 1 Page - Micro Linear Corporation

Part No. ML2281
Description  Serial I/O 8-Bit A/D Converters with Multiplexer Options
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Maker  MICRO-LINEAR [Micro Linear Corporation]
Homepage  http://www.microlinear.com
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BLOCK DIAGRAM
1
May 1997
ML2281, ML2282*,
ML2284#, ML2288#
Serial I/O 8-Bit A/D Converters with
Multiplexer Options
GENERAL DESCRIPTION
The ML2281 family are 8-bit successive approximation
A/D converters with serial I/O and configurable input
multiplexers with up to 8 input channels.
All errors of the sample-and-hold, incorporated on the
ML2281 family are accounted for in the analog-to-digital
converters accuracy specification.
The voltage reference can be externally set to any value
between GND and VCC, thus allowing a full conversion
over a relatively small voltage span if desired.
The ML2281 family is an enhanced double polysilicon
CMOS pin compatible second source for the ADC0831,
ADC0832, ADC0834, and ADC0838 A/D converters. The
ML2281 series enhancements are faster conversion time,
true sample-and-hold function, superior power supply
rejection, improved AC common mode rejection, faster
digital timing, and lower power dissipation. All parameters
are guaranteed over temperature with a power supply
voltage of 5V ±10%.
FEATURES
s Conversion time: 6µs
s Total unadjusted error: ±1/2LSB or ±1LSB
s Sample-and-hold: 375ns acquisition
s 2, 4 or 8-input multiplexer options
s 0 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 ML2281 capable of digitizing a 5V, 40kHz sine wave
s Low power: 12.5mW MAX
s Superior pin compatible replacement for ADC0831,
ADC0832, ADC0834, and ADC0838
s Analog input protection: 25mA (min) per input
s Now in 8-Pin SOIC Package (ML2281, ML2282)
INPUT
SHIFT-REGISTER
OUTPUT
SHIFT-REGISTER
SHUNT
REGULATOR
CONTROL
AND
TIMING
DI
SARS
CLK
CS
DO
4-BIT
SE
DGND
V+
VCC
VREF
AGND
COMMON
CH7
CH6
CH5
CH4
CH3
CH2
CH1
CH0
A/D
CONVERTER
WITH
SAMPLE & HOLD
FUNCTION
Σ
VREF
CLK
CS
VIN–
SUCCESSIVE
APPROXIMATION
REGISTER
D/A
CONVERTER
+
OUTPUT
SHIFT-REGISTER
CONTROL
AND
TIMING
COMP
A/D WITH SAMPLE & HOLD FUNCTION
8pF
8pF
+
VIN+
VCC
GND
DO
ML2281
ML2288 (8-Channel SE or 4-Channel Diff Multiplexer)
ML2284 (4-Channel SE or 2-Channel Diff Multiplexer)
ML2284 (2-Channel SE or 1-Channel Diff Multiplexer)
(* Indicates Part is Obsolete)
(# Indicates Part is End Of Life as Of July 1, 2000)




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