參數(shù)資料
型號: ADC0838
廠商: National Semiconductor Corporation
元件分類: 串行ADC
英文描述: 8-Bit Serial I/O A/D Converters with Multiplexer Options
中文描述: 8位串行I /辦公自動化/ D轉(zhuǎn)換器多路復(fù)用選項
文件頁數(shù): 1/26頁
文件大小: 410K
代理商: ADC0838
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 V
CC
, 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
I
Conversion time: 6μs
I
Total unadjusted error: ±1/2LSB or ±1LSB
I
Sample-and-hold: 375ns acquisition
I
2, 4 or 8-input multiplexer options
I
0 to 5V analog input range with single 5V
power supply
I
Operates ratiometrically or with up to 5V
voltage reference
I
No zero or full-scale adjust required
I
ML2281 capable of digitizing a 5V, 40kHz sine wave
I
Low power: 12.5mW MAX
I
Superior pin compatible replacement for ADC0831,
ADC0832, ADC0834, and ADC0838
I
Analog input protection: 25mA (min) per input
I
Now in 8-Pin SOIC Package (ML2281, ML2282)
(* Indicates Part is Obsolete)
(# Indicates Part is End Of Life as Of July 1, 2000)
INPUT
SHIFT-REGISTER
OUTPUT
SHIFT-REGISTER
SHUNT
REGULATOR
CONTROL
AND
TIMING
DI
SARS
CLK
CS
DO
4-BIT
SE
DGND
V+
V
CC
V
REF
AGND
COMMON
CH7
CH6
CH5
CH4
CH3
CH2
CH1
CH0
A/D
CONVERTER
WITH
SAMPLE & HOLD
FUNCTION
M
(
Σ
V
REF
CLK
CS
V
IN–
SUCCESSIVE
APPROXIMATION
REGISTER
D/A
CONVERTER
+
COMP
OUTPUT
SHIFT-REGISTER
CONTROL
AND
TIMING
A/D WITH SAMPLE & HOLD FUNCTION
+
8pF
8pF
V
IN+
V
CC
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)
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