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ADS7822EC/250 bảng dữ liệu(PDF) 3 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  ANALOG-TO-DIGITAL CONVERTER
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ADS7822EC/250 bảng dữ liệu(HTML) 3 Page - Texas Instruments

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ELECTRICAL CHARACTERISTICS: +VCC = +2.7V
ADS7822
SBAS062C – JANUARY 1996 – REVISED AUGUST 2007
At –40
°C to +85°C, +V
CC = +2.7V, VREF = +2.5V, fSAMPLE = 75kHz, and fCLK = 16 × fSAMPLE, unless otherwise noted.
ADS7822
ADS7822B
ADS7822C
PARAMETER
TEST CONDITIONS
UNIT
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
ANALOG INPUT
Full-scale input span
+In – (–In)
0
VREF
0
VREF
0
VREF
V
+In – GND
–0.2
VCC + 0.2
–0.2
VCC + 0.2
–0.2
VCC + 0.2
V
Absolute input range
–In – GND
–0.2
+1.0
–0.2
+1.0
–0.2
+1.0
V
Capacitance
25
25
25
pF
Leakage current
±1
±1
±1
μA
SYSTEM PERFORMANCE
Resolution
12
12
12
Bits
No missing codes
11
12
11
Bits
Integral linearity error
–2
±0.5
+2
–1
±0.5
+1
–0.75
±0.25
+0.75
LSB
(1)
Differential linearity error
–2
±0.5
+2
–1
±0.5
+1
–0.75
±0.25
+0.75
LSB
Offset error
–3
+3
–3
+3
–1
+1
LSB
Gain error
–3
+3
–3
+3
–1
+1
LSB
Noise
33
33
33
μVrms
Power-supply rejection
82
82
82
dB
SAMPLING DYNAMICS
Conversion time
12
12
12
Clk Cycles
Acquisition time
1.5
1.5
1.5
Clk Cycles
Throughput rate
75
75
75
kHz
DYNAMIC CHARACTERISTICS
Total harmonic distortion
VIN = 2.5VPP at 1kHz
–82
–82
–82
dB
SINAD
VIN = 2.5VPP at 1kHz
71
71
71
dB
Spurious-free dynamic range
VIN = 2.5VPP at 1kHz
86
86
86
dB
REFERENCE OUTPUT
Voltage range
0.05
VCC
0.05
VCC
0.05
VCC
V
CS = GND, fSAMPLE = 0Hz
5
5
5
G
Resistance
CS = VCC
5
5
5
G
At code 710h
8
40
8
40
8
40
μA
Current drain
fSAMPLE = 7.5kHz
0.8
0.8
0.8
μA
CS = VCC
0.001
3
0.001
3
0.001
3
μA
DIGITAL INPUT/OUTPUT
Logic family
CMOS
CMOS
CMOS
VIH
IIH = +5μA
2.0
5.5
2.0
5.5
2.0
5.5
V
VIL
IIL = +5μA
–0.3
0.8
–0.3
0.8
–0.3
0.8
V
Logic levels
VOH
IOH = –250μA
2.1
2.1
2.1
V
VOL
IOL = 250μA
0.4
0.4
0.4
V
Data format
Straight Binary
Straight Binary
Straight Binary
POWER-SUPPLY REQUIREMENTS
Specified performance
2.7
3.6
2.7
3.6
2.7
3.6
V
VCC
See Notes
(2) and (3)
2.0
2.7
2.0
2.7
2.0
2.7
V
See Note
(3)
2.7
3.6
2.7
3.6
2.7
3.6
V
fSAMPLE = 7.5kHz
(4) (5)
20
20
20
μA
Quienscent current
fSAMPLE = 75kHz
(5)
200
325
200
325
200
325
μA
Power down
CS = VCC
3
3
3
μA
TEMPERATURE RANGE
Specified performance
–40
+85
–40
+85
–40
+85
°C
(1)
LSB means least significant bit. With VREF equal to +2.5V, one LSB is 0.61mV.
(2)
The maximum clock rate of the ADS7822 is less than 1.2MHz in this power-supply range.
(3)
See the Typical Characteristics for more information.
(4)
fCLK = 1.2MHz, CS = VCC for 145 clock cycles out of every 160.
(5)
See the Power Dissipation section for more information regarding lower sample rates.
Copyright © 1996–2007, Texas Instruments Incorporated
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