AD693AD 查看數據表（PDF） - Analog Devices

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AD693AD

Loop-Powered 4–20 mA Sensor Transmitter

Analog Devices 

AD693

Model

Conditions

AD693AD

Min Typ Max

Units

AUXILIARY AMPLIFIER

Common-Mode Range

Input Offset Voltage

Input Bias Current

Input Offset Current

Common-Mode Rejection

Power Supply Rejection

Output Current Range

Output Current Error

TEMPERATURE RANGE

Case Operating14

Storage

Pin IX OUT

Pin VX – Pin IX

TMIN to TMAX

0

+VOP – 4 V6

V

± 50 ± 200

µV

+5

+20

nA

+0.5 ± 3.0

nA

90

dB

105

dB

+0.01

+5

mA

± 0.005

%

–40

+85

°C

–65

+150

°C

NOTES

1 Total error can be significantly reduced (typically less than 0.1%) by trimming the zero current. The remaining unadjusted error sources are transconductance and

nonlinearity.

2 The AD693 is tested as a loop powered device with the signal amp, V/I converter, voltage reference, and application voltages operating together. Specifications are

valid for preset spans and spans between 30 mV and 60 mV.

3 Error from ideal output assuming a perfect 100 Ω RTD at 0 and +100°C.

4 Refer to the Error Analysis to calculate zero current error for input spans less than 30 mV.

5 By forcing the differential signal amplifier input sufficiently negative the 7 µA zero current can always be achieved.

6 The operational voltage (VOP) is the voltage directly across the AD693 (Pin 10 to 6 in two-wire mode, Pin 9 to 6 in local power mode). For example, VOP = VS –

(ILOOP × RL) in two-wire mode (refer to Figure 10).

7Bias currents are not symmetrical with input signal level and flow out of the input pins. The input bias current of the inverting input increases with input signal volt-

age, see Figure 2.

8 Nonlinearity is defined as the deviation of the output from a straight line connecting the endpoints as the input is swept over a 30 mV and 60 mV input span.

9 Specifications for the individual functional blocks are components of error that contribute to, and that are included in, the Loop Powered Operation specifications.

10Includes error contributions of V/I converter and Application Voltages.

11Changes in the reference output voltage due to load will affect the Zero Current. A 1% change in the voltage reference output will result in an error of 1% in the

value of the Zero Current.

12If not used for external excitation, the reference should be loaded by approximately 1 mA (6.2 kΩ to common).

13In the loop powered mode up to 5 mA can be drawn from the reference, however, the lower limit of the output span will be increased accordingly. 3.5 mA is the

maximum current the reference can source while still maintaining a 4 mA zero.

14 The AD693 is tested with a pass transistor so TA ≅ TC.

Specifications subject to change without notice.

Specifications shown in boldface are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels. All min

and max specifications are guaranteed, although only those shown in boldface are tested on all production units.

ABSOLUTE MAXIMUM RATINGS

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +36 V

Reverse Loop Current . . . . . . . . . . . . . . . . . . . . . . . . . 200 mA

Signal Amp Input Range . . . . . . . . . . . . . . . . . . –0.3 V to VOP

Reference Short Circuit to Common . . . . . . . . . . . . Indefinite

Auxiliary Amp Input Voltage Range . . . . . . . . . . 0.3 V to VOP

Auxiliary Amp Current Output . . . . . . . . . . . . . . . . . . . 10 mA

Storage Temperature . . . . . . . . . . . . . . . . . . –65°C to +150°C

Lead Temperature, 10 sec Soldering . . . . . . . . . . . . . +300°C

Max Junction Temperature . . . . . . . . . . . . . . . . . . . . . +150°C

AD693 PIN CONFIGURATION

(AD, AQ, AE Packages)

Model

AD693AD

AD693AQ

AD693AE

ORDERING GUIDE

Package

Description

Ceramic Side-Brazed DIP

Cerdip

Leadless Ceramic Chip

Carrier (LCCC)

Package

Option

D-20

Q-20

E-20A

Functional Diagram

REV. A

–3–

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