AD7818AR(2000) Просмотр технического описания (PDF) - Analog Devices
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Компоненты Описание
производитель
AD7818AR
(Rev.:2000)
(Rev.:2000)
Analog Devices
AD7818AR Datasheet PDF : 16 Pages
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AD7816/AD7817/AD7818–SPECIFICATIONS1
Parameter
ANALOG INPUTS7
Input Voltage Range
Input Leakage
Input Capacitance
LOGIC INPUTS4
Input High Voltage, VINH
Input Low Voltage, VINL
Input High Voltage, VINH
Input Low Voltage, VINL
Input Current, IIN
Input Capacitance, CIN
LOGIC OUTPUTS4
Output High Voltage, VOH
Output Low Voltage, VOL
High Impedance Leakage Current
High Impedance Capacitance
A Version
VREF
0
±1
10
2.4
0.8
2
0.4
±3
10
4
2.4
0.4
0.2
±1
15
*B Version *S Version
VREF
0
±1
10
VREF
0
±1
10
2.4
2.4
0.8
0.8
2
2
0.4
0.4
±3
±3
10
10
4
4
2.4
2.4
0.4
0.4
0.2
0.2
±1
±1
15
15
Units
V max
V min
µA min
pF max
V min
V max
V min
V max
µA max
pF max
V min
V min
V max
V max
µA max
pF max
Test Conditions/Comments
(AD7817 and AD7818)
VDD = 5 V ± 10%
VDD = 5 V ± 10%
VDD = 3 V ± 10%
VDD = 3 V ± 10%
Typically 10 nA, VIN = 0 V to VDD
ISOURCE = 200␣ µA
VDD = 5 V ± 10%
VDD = 3 V ± 10%
ISINK = 200 µA
VDD = 5 V ± 10%
VDD = 3 V ± 10%
NOTES
*B and S Versions apply to AD7817 only. For operating temperature ranges, see Ordering Guide.
1AD7816 and AD7817 temperature sensors specified with external +2.5 V reference, AD7818 specified with on-chip reference. All other specifications with external
and on-chip reference (+2.5 V). For VDD = +2.7 V, TA = +85°C max and temperature sensor measurement error = ± 3°C.
2See Terminology.
3The accuracy of the temperature sensor is affected by reference tolerance. The relationship between the two is explained in the section titled Temperature Measure-
ment Error Due to Reference Error.
4Sample tested during initial release and after any redesign or process change that may affect this parameter.
5On-chip reference shuts down when external reference is applied.
6All specifications are typical for AD7818 at temperatures above +85°C and with VDD greater than +3.6 V.
7Refers to the input current when the part is not converting. Primarily due to reverse leakage current in the ESD protection diodes.
Specifications subject to change without notice.
REFIN
AD7816
TEMP
SENSOR
REF
2.5V
VDD
OVER-TEMP
REG
B
CHARGE
REDISTRIBUTION
DAC
A>B
A
DATA
OUT
MUX
SAMPLING
CAPACITOR
CONTROL
LOGIC
CONTROL
REG
VBALANCE
CLOCK
OTI
DIN/OUT
SCLK
RD/WR
AGND
CONVST
Figure 1. AD7816 Functional Block Diagram
VDD
AD7818
TEMP
SENSOR
REF
2.5V
VIN1
MUX
SAMPLING
CAPACITOR
VBALANCE
OVER-TEMP
REG
B
CHARGE
REDISTRIBUTION
DAC
A>B
A
DATA
OUT
CONTROL
LOGIC
CONTROL
REG
CLOCK
GENERATOR
OTI
DIN/OUT
SCLK
RD/WR
AGND
CONVST
Figure 2. AD7818 Functional Block Diagram
–4–
REV. A
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