AD7817 AD [Analog Devices], AD7817 Datasheet - Page 4

• Manufacturer Part Number: AD7817
• Description: Single- and 4-Channel, 9 us, 10-Bit ADCs with On-Chip Temperature Sensor
• Manufacturer: AD [Analog Devices]

AD7816/AD7817/AD7818–SPECIFICATIONS
Parameter
ANALOG INPUTS
LOGIC INPUTS
LOGIC OUTPUTS
NOTES
*B and S Versions apply to AD7817 only. For operating temperature ranges, see Ordering Guide.
1
2
3
4
5
6
7
Specifications subject to change without notice.
AD7816 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 V
See Terminology.
The 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.
Sample tested during initial release and after any redesign or process change that may affect this parameter.
On-chip reference shuts down when external reference is applied.
All specifications are typical for AD7818 at temperatures above 85°C and with V
Refers to the input current when the part is not converting. Primarily due to reverse leakage current in the ESD protection diodes.
Input Voltage Range
Input Leakage
Input Capacitance
Input High Voltage, V
Input Low Voltage, V
Input High Voltage, V
Input Low Voltage, V
Input Current, I
Input Capacitance, C
Output High Voltage, V
Output Low Voltage, V
High Impedance Leakage Current
High Impedance Capacitance
SENSOR
TEMP
MUX
Figure 1. AD7816 Functional Block Diagram
AD7816
CAPACITOR
SAMPLING
AGND
V
REF
2.5V
BALANCE
4
IN
REF
7
4
IN
IN
INL
INL
INH
INH
OL
OH
REDISTRIBUTION
DD
OVERTEMP
CHARGE
CONTROL
DAC
LOGIC
= 2.7 V, T
REG
V
DD
CONVST
A Version
V
0
10
2.4
0.8
2
0.4
10
4
2.4
0.4
0.2
15
REF
A
1
3
1
B
= 85°C max and temperature sensor measurement error =
CONTROL
CLOCK
A > B
DATA
OUT
REG
A
*B Version *S Version
V
0
10
2.4
0.8
2
0.4
10
4
2.4
0.4
0.2
15
REF
1
3
1
D
SCLK
OTI
RD/WR
IN/OUT
–4–
DD
greater than 3.6 V.
V
0
10
2.4
0.8
2
0.4
10
4
2.4
0.4
0.2
15
V
REF
1
3
1
IN1
SENSOR
TEMP
Figure 2. AD7818 Functional Block Diagram
MUX
AD7818
Unit
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
V
DD
CAPACITOR
SAMPLING
V
REF
2.5V
BALANCE
AGND
3°C.
Test Conditions/Comments
(AD7817 and AD7818)
V
V
V
V
Typically 10 nA, V
I
V
V
I
V
V
SOURCE
SINK
DD
DD
DD
DD
DD
DD
DD
DD
REDISTRIBUTION
= 5 V
= 5 V
= 3 V
= 3 V
= 5 V
= 3 V
= 5 V
= 3 V
= 200 µA
OVERTEMP
CHARGE
CONTROL
DAC
LOGIC
REG
= 200 µA
CONVST
10%
10%
10%
10%
10%
10%
10%
10%
B
GENERATOR
IN
CONTROL
CLOCK
A > B
DATA
OUT
REG
= 0 V to V
A
REV. C
SCLK
OTI
D
RD/WR
DD
IN/OUT