AD7816ARM datasheet(4/20 Pages) AD

4 / 20 page

REV. C

–4–

AD7816/AD7817/AD7818–SPECIFICATIONS

Parameter

A Version

*B Version

*S Version

Unit

Test Conditions/Comments

ANALOG INPUTS

(AD7817 and AD7818)

Input Voltage Range

VREF

V max

00V min

Input Leakage

µA min

Input Capacitance

pF max

LOGIC INPUTS

Input High Voltage, VINH

2.4

V min

VDD = 5 V

10%

Input Low Voltage, VINL

0.8

V max

VDD = 5 V

10%

Input High Voltage, VINH

22V min

VDD = 3 V

10%

Input Low Voltage, VINL

0.4

V max

VDD = 3 V

10%

Input Current, IIN

µA max

Typically 10 nA, VIN = 0 V to VDD

Input Capacitance, CIN

pF max

LOGIC OUTPUTS

Output High Voltage, VOH

ISOURCE = 200

µA

44V min

VDD = 5 V

10%

2.4

V min

VDD = 3 V

10%

Output Low Voltage, VOL

ISINK = 200

µA

0.4

V max

VDD = 5 V

10%

0.2

V max

VDD = 3 V

10%

High Impedance Leakage Current

µA max

High Impedance Capacitance

pF max

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 V

DD 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.

CHARGE

REDISTRIBUTION

DAC

CLOCK

DATA

OUT

DIN/OUT

SCLK

RD/

CONVST

AGND

CONTROL

REG

OVERTEMP

REG

A > B

OTI

CONTROL

LOGIC

VBALANCE

SAMPLING

CAPACITOR

MUX

REF

2.5V

TEMP

SENSOR

REFIN

VDD

AD7816

Figure 1. AD7816 Functional Block Diagram

CHARGE

REDISTRIBUTION

DAC

CLOCK

GENERATOR

DATA

OUT

DIN/OUT

SCLK

RD/

CONVST

AGND

CONTROL

REG

OVERTEMP

REG

A > B

OTI

CONTROL

LOGIC

VBALANCE

SAMPLING

CAPACITOR

MUX

REF

2.5V

TEMP

SENSOR

VDD

VIN1

AD7818

Figure 2. AD7818 Functional Block Diagram

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