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ADC78H90 bảng dữ liệu(PDF) 4 Page - National Semiconductor (TI)

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tên linh kiện ADC78H90
Giải thích chi tiết về linh kiện  8-Channel, 500 kSPS, 12-Bit A/D Converter
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ADC78H90 Converter Electrical Characteristics (Note 8) (Continued)
The following specifications apply for AV
DD =DVDD = +2.7V to 5.25V, AGND = DGND = 0V, fSCLK = 8 MHz, fSAMPLE = 500
KSPS, unless otherwise noted. Boldface limits apply for T
A =TMIN to TMAX: all other limits TA = 25˚C.
Symbol
Parameter
Conditions
Typical
Limits
(Note 7)
Units
ANALOG INPUT CHARACTERISTICS
V
IN
Input Range
0 to AV
DD
V
I
DCL
DC Leakage Current
±1
µA (max)
C
INA
Input Capacitance
Track Mode
33
pF
Hold Mode
3
pF
DIGITAL INPUT CHARACTERISTICS
V
IH
Input High Voltage
DV
DD = +4.75Vto +5.25V
2.4
V (min)
DV
DD = +2.7V to +3.6V
2.1
V (min)
V
IL
Input Low Voltage
DV
DD = +2.7V to +5.25V
0.8
V (max)
I
IN
Input Current
V
IN =0VorDVDD
±0.01
±1
µA (max)
C
IND
Digital Input Capacitance
2
4
pF (max)
DIGITAL OUTPUT CHARACTERISTICS
V
OH
Output High Voltage
I
SOURCE = 200 µA, DVDD = +2.7V to
+5.25V
DV
DD −0.5
V (min)
V
OL
Output Low Voltage
I
SINK = 200 µA
0.4
V (max)
I
OZH,
I
OZL
TRI-STATE® Leakage Current
±1
µA (max)
C
OUT
TRI-STATE® Output Capacitance
2
4
pF (max)
Output Coding
Straight (Natural) Binary
POWER SUPPLY CHARACTERISTICS (C
L =10pF)
AV
DD,
DV
DD
Analog and Digital Supply Voltages
AV
DD
≥ DV
DD
2.7
V (min)
5.25
V (max)
I
A +ID
Total Supply Current, Normal Mode
(Operational, CS low)
AV
DD =DVDD = +4.75V to +5.25V,
f
SAMPLE = 500 kSPS, fIN =40kHz
1.65
2.3
mA (max)
AV
DD =DVDD = +2.7V to +3.6V,
f
SAMPLE = 500 kSPS, fIN =40kHz
0.5
2.3
mA (max)
Total Supply Current, Shutdown (CS
high)
AV
DD =DVDD = +4.75V to +5.25V,
f
SAMPLE = 0 kSPS
200
nA
AV
DD =DVDD = +2.7V to +3.6V,
f
SAMPLE = 0 kSPS
200
nA
P
D
Power Consumption, Normal Mode
(Operational, CS low)
\AV
DD =DVDD = +4.75V to +5.25V
8.3
12
mW (max)
AV
DD =DVDD = +2.7V to +3.6V
1.5
8.3
mW (max)
Power Consumption, Shutdown (CS
high)
AV
DD =DVDD = +4.75V to +5.25V
0.5
µW
AV
DD =DVDD = +2.7V to +3.6V
0.3
µW
AC ELECTRICAL CHARACTERISTICS
f
SCLK
Maximum Clock Frequency
8
MHz (min)
f
SMIN
Minimum Clock Frequency
50
kHz
f
S
Maximum Sample Rate
500
KSPS (min)
t
CONV
Conversion Time
13
SCLK cycles
DC
SCLK Duty Cycle
50
40
% (min)
60
% (max)
t
ACQ
Track/Hold Acquisition Time
Full-Scale Step Input
3
SCLK cycles
Throughput Time
Acquisition Time + Conversion Time
16
SCLK cycles
f
RATE
Throughput Rate
500
kSPS (min)
t
AD
Aperture Delay
4
ns
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