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ML2284BCS 데이터시트 PDF




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부품번호 ML2284BCS 기능
기능 Serial I/O 8-Bit A/D Converters with Multiplexer Options
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ML2284BCS 데이터시트, 핀배열, 회로
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%.
BLOCK DIAGRAM
ML2281
CONTROL
AND
TIMING
CS
CLK
OUTPUT
SHIFT-REGISTER
DO
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)
(* Indicates Part is Obsolete)
(# Indicates Part is End Of Life as Of July 1, 2000)
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)
4-BIT
INPUT
SHIFT-REGISTER
CONTROL
AND
TIMING
DI
SARS
CLK
CS
VIN+
A/D WITH SAMPLE & HOLD FUNCTION
+Σ
8pF
+
COMP
SUCCESSIVE
APPROXIMATION
REGISTER
VIN–
8pF
D/A
CONVERTER
VREF
VCC GND
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
COMMON
OUTPUT
SHIFT-REGISTER
DO
SE
A/D
CONVERTER
WITH
SAMPLE & HOLD
FUNCTION
DGND
SHUNT
REGULATOR
AGND VREF
VCC V+
1




ML2284BCS pdf, 반도체, 판매, 대치품
ML2281, ML2282, ML2284, ML2288
ABSOLUTE MAXIMUM RATINGS
Absolute maximum ratings are those values beyond which
the device could be permanently damaged. Absolute
maximum ratings are stress ratings only and functional
device operation is not implied.
Current into V+ ...................................................... 15mA
Supply Voltage, VCC ................................................. 6.5V
Voltage
Logic Inputs ........................................... –7 to VCC +7V
Analog Inputs ................................ –0.3V to VCC +0.3V
Input Current per Pin (Note 1) .............................. ±25mA
Storage Temperature ................................ –65°C to 150°C
Package Dissipation
at TA = 25°C (Board Mount) ............................. 800mW
Lead Temperature (Soldering 10 sec.)
Dual-In-Line Package (Molded) .......................... 260°C
Dual-In-Line Package (Ceramic) ......................... 300°C
Molded Chip Carrier Package
Vapor Phase (60 sec.) ..................................... 215°C
Infrared (15 sec.) ............................................. 220°C
OPERATING CONDITIONS
Supply Voltage, VCC ............................ 4.5VDC to 6.3VDC
Temperature Range (Note 2) ................. TMIN - TA - TMAX
ML2281/2/4/8 BIX .................................. –40°C to 85°C
ML2281/2/4/8 CIX
ML2281/2/4/8 BCX .................................... 0°C to 70°C
ML2281/2/4/8 CCX
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, TA = TMIN to TMAX, VCC = VREF = 5V ±10%, and fCLK = 1.333MHz.
ML228XB
ML228XC
SYMBOL
PARAMETER
CONDITIONS
TYP
MIN NOTE 3 MAX
TYP
MIN NOTE 3
MAX
CONVERTER AND MULTIPLEXER CHARACTERISTICS
Total Unadjusted VREF = VCC (Notes 4, 6)
Error
±1/2
±1
Reference Input
Resistance
(Notes 4, 7)
10 15 20 10 15 20
Common-Mode
Input Range
(Notes 4, 8)
GND
–0.05
VCC
+0.05
GND
–0.05
VCC
+0.05
DC Common-Mode Common mode voltage
Error
voltage GND to VCC/2
(Note 5)
±1/16 ±1/4
±1/16 ±1/4
AC Common-Mode Common mode voltage
Error
GND to VCC/2,
0 to 50kHz (Note 5)
±1/4
±1/4
DC Power Supply
Sensitivity
VCC = 5V ±10%
VREF - VCC +0.1V
(Note 5)
±1/32 ±1/4
±1/32 ±1/4
AC Power Supply 100mVP-P, 25kHz sine
Sensitivity
on VCC (Note 5)
Change in Zero
Error from VCC=5V
to Internal Zener
Operation
15mA into V+
VCC = N.C. VREF = 5V
(Note 5)
±1/2
±1/4
±1/4
±1/2
VZ Internal Diode
15mA into V+
Regulated Break-
down (at V+)
6.9
6.9
V+ Input Resistance (Note 4)
20 35
20 35
UNITS
LSB
kW
V
LSB
LSB
LSB
LSB
LSB
V
kW
4

4페이지










ML2284BCS 전자부품, 판매, 대치품
t1H
DATA
OUTPUT
CL
RL
ML2281, ML2282, ML2284, ML2288
VCC
CS
GND
VOH
DO AND
SARS OUTPUTS
GND
t1H
tr
90%
50%
10%
t1H
90%
CLK
CS
DATA
IN (DI)
t0H t0H
VCC
DATA
OUTPUT
RL
CL
VCC
CS
GND
DO AND
SARS OUTPUTS
VCC
VOL
tr
90%
50%
10%
t0H
10%
Figure 1. High Impedance Test Circuits and Waveforms
Data Input Timing
Data Output Timing
tSET-UP
tHOLD
tSET-UP
tHOLD
CLK
DATA
OUT (DO)
SE
tPD0, tPD1
tPD0, tPD1
tSET-UP
ML2281 Start Conversion Timing
CLK
tSET-UP
CS
START CONVERSION
DO
BIT 7
(MSB)
BIT 6
Figure 2. Timing Diagrams
7

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