ML2280 Datasheet, PDF (1/20 Pages) Micro Linear Corporation – Serial I/O 8-Bit A/D Converters

May 1997
ML2280*, ML2283**
Serial I/O 8-Bit A/D Converters
GENERAL DESCRIPTION
The ML2280 and ML2283 are 8-bit successive
approximation A/D converters with serial I/O and
configurable input multiplexers with up to 4 input
channels.
All errors of the sample-and-hold incorporated on the
ML2280 and ML2283 are accounted for in the analog-to-
digital converters accuracy specification.
The voltage reference can be externally set to any value
between GND and V_CC, thus allowing a full conversion
over a relatively small voltage span if desired.
The ML2283 is an enhanced double polysilicon, CMOS,
pin-compatible second source for the ADC0833 A/D
converter. All parameters are guaranteed over temperature
with a power supply voltage of 5V ±10%.
BLOCK DIAGRAM
ML2281
CS
CONTROL
AND
CLK
TIMING
OUTPUT
DO
SHIFT-REGISTER
FEATURES
s Conversion time: 6µs
s ML2280 capable of digitizing a 5V, 40kHz sine wave
s Total unadjusted error with external
reference: ±1/2LSB or ±1LSB
s Sample-and-hold: 375ns acquisition
s 0 to 5V analog input range with single 5V
power supply
s 2.5V reference provides 0 to 5V analog input range
s No zero- or full-scale adjust required
s Low power: 12.5mW MAX
s Analog input protection: 25mA (min) per input
s Differential analog voltage inputs (ML2280)
s Programmable multiplexer with differential or single
ended analog inputs (ML2283)
s 0.3" width 8- or 14-pin DIP, or 8-Pin SOIC (ML2280)
s Superior pin-compatible replacement for ADC0833
* This Part Is Obsolete
** This Part Is End Of Life As Of August 1, 2000
ML2283
4-BIT
INPUT
SHIFT-REGISTER
CONTROL
AND
TIMING
DI
SARS
CLK
CS
V_IN+
A/D WITH SAMPLE & HOLD FUNCTION
+_Σ
–
8pF
+
COMP
–
SUCCESSIVE
APPROXIMATION
REGISTER
V_IN–
8pF
D/A
CONVERTER
V_REF/2
V_CC
GND
CH0
4-CHANNEL
CH1
S.E.
OR
2-CHANNEL
CH2
DIFF
MULTIPLEXER
CH3
OUTPUT
DO
SHIFT-REGISTER
SE
A/D
CONVERTER
WITH
SAMPLE & HOLD
FUNCTION
AGND ^VREF/2
V_CC
DGND
SHUNT
REGULATOR
V+
1