參數(shù)資料
型號(hào)： AD7718
廠商： Analog Devices, Inc.
英文描述： 8-/10-Channel, Low Voltage, Low Power, ADCs
中文描述： 8-/10-Channel，低電壓，低功耗，ADC的
文件頁數(shù)： 8/44頁
文件大?。?/td> 339K
代理商： AD7718
REV. 0
–8–
1
2.5 V ; REFIN(–) = AGND; AGND = DGND = 0 V; XTAL1/XTAL2 = 32.768 kHz Crystal Input Buffer Enabled. All specifications T
MIN
to T
MAX
unless otherwise noted.)
Parameter
B Grade
(AV
DD
= 2.7 V to 3.6 V or 4.75 V to 5.25 V, DV
DD
= 2.7 V to 3.6 V or 4.75 V to 5.25 V, REFIN(+) =
AD7718–SPECIFICATIONS
Unit
Test Conditions
LOGIC INPUTS (Continued)
SCLK Only (Schmitt-Triggered Input)
2
V
T(+)
V
T(–)
V
T(+)
–V
T(–)
V
T(+)
V
T(–)
V
T(+)
–V
T(–)
XTAL1 Only
2
V
INL
, Input Low Voltage
V
INH
, Input High Voltage
V
INL
, Input Low Voltage
V
INH
, Input High Voltage
Input Currents
1.4/2
0.8/1.4
0.3/0.85
0.95/2
0.4/1.1
0.3/0.85
V min/V max
V min/V max
V min/V max
V min/V max
V min/V max
V min/V max
DV
DD
= 5 V
DV
DD
= 5 V
DV
DD
= 5 V
DV
DD
= 3 V
DV
DD
= 3 V
DV
DD
= 3 V
0.8
3.5
0.4
2.5
±
10
–70
V max
V min
V max
V min
μ
A max
μ
A max
DV
DD
= 5 V
DV
DD
= 5 V
DV
DD
= 3 V
DV
DD
= 3 V
Logic Input = DV
DD
Logic Input = DGND, Typical –40
μ
A @ 5 V
and –20
μ
A at 3 V
All Digital Inputs
Input Capacitance
10
pF typ
LOGIC OUTPUTS (Excluding XTAL2)
5
V
OH
, Output High Voltage
2
V
OL
, Output Low Voltage
2
V
OH
, Output High Voltage
2
V
OL
, Output Low Voltage
2
Floating State Leakage Current
Floating State Output Capacitance
Data Output Coding
DV
DD
– 0.6
0.4
4
0.4
±
10
±
10
Binary
Offset Binary
V min
V max
V min
V max
μ
A max
pF typ
DV
DD
= 3 V, I
SOURCE
= 100
μ
A
DV
DD
= 3 V, I
SINK
= 100
μ
A
DV
DD
= 5 V, I
SOURCE
= 200
μ
A
DV
DD
= 5 V, I
SINK
= 1.6 mA
Unipolar Mode
Bipolar Mode
SYSTEM CALIBRATION
2
Full-Scale Calibration Limit
Zero-Scale Calibration Limit
Input Span
1.05
×
FS
–1.05
×
FS
0.8
×
FS
2.1
×
FS
V max
V min
V min
V max
START-UP TIME
From Power-On
From Power-Down Mode
300
1
300
ms typ
ms typ
ms typ
Oscillator Powered Down
POWER REQUIREMENTS
Power Supply Voltages
AV
DD
–AGND
AV
DD
and DV
DD
can be operated independently of each other.
2.7/3.6
V min/max
4.75/5.25
V min/max
2.7/3.6
V min/max
4.75/5.25
V min
0.55
mA max
0.65
mA
1.1
mA
10
μ
A max
2
μ
A max
30
μ
A max
8
μ
A max
1
μ
A max
AV
DD
= 3 V nom
AV
DD
= 5 V nom
DV
DD
= 3 V nom
DV
DD
= 5 V nom
DV
DD
= 3 V, 0.43 mA typ
DV
DD
= 5 V, 0.5 mA typ
AV
DD
= 3 V or 5 V, 0.85 mA typ
DV
DD
= 3 V, 32.768 kHz Osc. Running
DV
DD
= 3 V, Oscillator Powered Down
DV
DD
= 5 V, 32.768 kHz Osc. Running
DV
DD
= 5 V, Oscillator Powered Down
AV
DD
= 3 V or 5 V
Input Range =
±
2.56 V, AIN = 1 V
95 dB typ
DV
DD
–DGND
DI
DD
(Normal Mode)
AI
DD
(Normal Mode)
DI
DD
(Power-Down Mode)
AI
DD
(Power-Down Mode)
Power Supply Rejection (PSR)
Chop Disabled
Chop Enabled
70
100
dB min
dB typ
NOTES
1
Temperature range is –40
°
C to +85
°
C.
2
Not production tested, guaranteed by design and/or characterization data at release.
3
Following a self-calibration this error will be in the order of the noise for the programmed gain and update selected. A system calibration will completely
remove this error.
4
Recalibration at any temperature will remove these errors.
5
I/O Port Logic Levels are with respect to AV
DD
and
AGND.
Specifications are subject to change without notice.
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