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FUNCTIONAL BLOCK DIAGRAM

REV. A

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

4–20 mA Transmitter

AD694*

FEATURES

4–20 mA, 0–20 mA Output Ranges

Precalibrated Input Ranges:

0 V to 2 V, 0 V to 10 V

Precision Voltage Reference

Programmable to 2.000 V or 10.000 V

Single or Dual Supply Operation

Wide Power Supply Range: +4.5 V to +36 V

Wide Output Compliance

Input Buffer Amplifier

Open-Loop Alarm

Optional External Pass Transistor to Reduce

Self-Heating Errors

0.002% typ Nonlinearity

PRODUCT DESCRIPTION

The AD694 is a monolithic current transmitter that accepts

high level signal inputs to drive a standard 4–20 mA current

loop for the control of valves, actuators, and other devices com-

monly used in process control. The input signal is buffered by

an input amplifier that can be used to scale the input signal or

buffer the output from a current mode DAC. Precalibrated in-

put spans of 0 V to 2 V and 0 V to 10 V are selected by simple

pin strapping; other spans may be programmed with external

resistor.

The output stage compliance extends to within 2 V of V

and its

special design allows the output voltage to extend below com-

mon in dual supply operation. An alarm warns of an open 4-to-

20 mA loop or noncompliance of the output stage.

Active laser trimming of the AD694’s thin film resistors results

in high levels of accuracy without the need for additional adjust-

ments and calibration. An external pass transistor may be used

with the AD694 to off-load power dissipation, extending the

temperature range of operation.

The AD694 is the ideal building block for systems requiring

noise immune 4–20 mA signal transmission to operate valves,

actuators, and other control devices, as well as for the transmis-

sion of process parameters such as pressure, temperature, or

flow. It is recommended as a replacement for discrete designs in

a variety of applications in industrial process control, factory

automation, and system monitoring.

The AD694 is available in hermetically sealed, 16-pin cerdip

and plastic SOIC, specified over the –40°C to +85°C industrial

temperature range, and in a 16-pin plastic DIP, specified over

the 0°C to +70°C temperature range.

*Protected by U.S. Patents: 30,586; 4,250,445; 4,857,862.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700 Fax: 617/326-8703

PRODUCT HIGHLIGHTS

1. The AD694 is a complete voltage in to 4–20 mA out current

transmitter.

2. Pin programmable input ranges are pre-calibrated at 0 V to

2 V and 0 V to 10 V.

3. The input amplifier may be configured to buffer and scale the

input voltage, or to serve as an output amplifier for current

output DACs.

4. The output voltage compliance extends to within 2 V of the

positive supply and below common. When operated with a

5 V supply, the output voltage compliance extends 30 V be-

low common.

5. The AD694 interfaces directly to 8-, 10-, and 12-bit single

supply CMOS and bipolar DACs.

6. The 4 mA zero current may be switched on and off with a

TTL control pin, allowing 0–20 mA operation.

7. An open collector alarm warns of loop failure due to open

wires or noncompliance of the output stage.

8. A monitored output is provided to drive an external pass

transistor. The feature off-loads power dissipation to extend

the temperature range of operation and minimize self-heating

error.

AD694–SPECIFICATIONS

Model AD694JN/AQ/AR AD694BQ/BR

Min Typ Max Min Typ Max Units

INPUT CHARACTERISTICS

Input Voltage Range –0.2 V

–2.0 V V

–2.5 V –0.2 V

–2.0 V V

–2.5 V V

Input Bias Current

Either Input, T

MIN

to T

MAX

1.5 5 1.5 5 nA

Offset Current, T

MIN

to T

MAX

±0.1 61 ±0.1 61 nA

Offset Current Drift ±1.0 ±5.0 ±1.0 ±5.0 pA/°C

Input Impedance 5 5 MΩ

OUTPUT CHARACTERISTICS

Operating Current Range 0 23 0 23 mA

Specified Performance 4 20 4 20 mA

Output Voltage Compliance V

–36 V V

–2 V V

–36 V V

–2 V V

Output Impedance, 4–20 mA 40.0 50.0 40.0 50.0 MΩ

Current Limit (@ 2 × FS Overdrive 24 44 24 44 mA

Slew Rate 1.3 1.3 mA/µs

SPAN AND ZERO ACCURACY

4 mA Offset Error @ 0 V Input

Error from 4.000 mA, 4 mA On ±10 620 ±5 610 µA

Error from 0.000 mA, 4 mA Off 0 +10 +20 0+5+10 µA

MIN

to T

MAX

±10 640 ±5 620 µA

vs. Supply (2 V Span/10 V Span) 0.3/0.05 0.8/0.4 0.3/0.05 0.8/0.4 µA/V

Trim Range, 4 mA Zero 2.0 4.8 2.0 4.8 mA

Span

Nominal Transfer Function

Input FS = 2 V 8.0 8.0 mA/V

Input FS = 10 V 1.6 1.6 mA/V

Transfer Function Error from Nom,

Input FS = 2 V, 10 V ±0.1 60.3 ±0.05 60.15 % of Span

MIN

to T

MAX

±0.002 ±0.005 ±0.001 60.0025 % of Span/°C

vs. Supply ±0.001 60.005 ±0.001 60.005 % of Span/V

Nonlinearity

±0.005 60.015 ±0.001 60.005 % of Span

4 mA On: Max Pin 9 Voltage 0.8 0.8 V

4 mA Off: Min Pin 9 Voltage 3.0 2.5 3.0 2.5 V

VOLTAGE REFERENCE

Output Voltage: 10 V Reference 9.960 10.000 10.040 9.980 10.000 10.020 V

Output Voltage: 2 V Reference 1.992 2.000 2.008 1.996 2.000 2.004 V

MIN

to T

MAX

30 50 20 30 ppm/°C

vs. Load, V

REF

= 2 V, 10 V 0.15 0.50 0.15 0.50 mV/mA

vs. Supply, V

REF

= 2 V, 10 V ±0.001 60.005 ±0.001 60.005 %/V

Output Current

Source 5 5mA

Sink 0.2 0.2 mA

ALARM CHARACTERISTICS

CE(SAT)

@ 2.5 mA 0.35 0.35 V

Leakage Current 61 61 µA

Alarm Pin Current (Pin 10) 20 20 mA

POWER REQUIREMENTS

Specified Performance 24 24 V

Operating Range

2 V FS, V

REF

= 2 V 4.5 36 4.5 36 V

2 V, 10 V FS, V

REF

= 2 V, 10 V 12.5 36 12.5 36 V

Quiescent Current, 4 mA Off 1.5 2.0 1.5 2.0 mA

TEMPERATURE RANGE

Specified Performance

AD694AQ/BQ/AR/BR –40 +85 –40 +85 °C

AD694JN 0 +70 0 +70 °C

Operating AD694AQ/BQ/AR/BR –55 +125 –55 +125 °C

AD694JN –40 +85 –40 +85 °C

(@ +258C, R

= 250 V and V

= +24 V, unless otherwise noted)

REV. A

–2–

Model AD694JN/AQ/AR AD694BQ/BR

Min Typ Max Min Typ Max Units

BUFFER AMPLIFIER

Input Offset Voltage

Initial Offset ±150 6500 ±50 6500 µV

MIN

to T

MAX

±2 ±3 ±2 ±3 µV/°C

vs. Supply 80 90 80 90 dB

vs. Common Mode 80 90 80 90 dB

Trim Range 62.5 ±4.0 62.5 ±4.0 mV

Frequency Response

Unity Gain, Small Signal 300 300 kHz

Input Voluge Noise (0.1 Hz to 10 Hz) 2 2 µV p-p

Open-Loop Gain

= +10 V, R

≥ 10 kΩ 50 50 V/mV

Output Voltage @ Pin 1, FB

Minimum Output Voltage 1.0 10 1.0 10 mV

Maximum Output Voltage V

–2.5 V V

–2 V V

–2.5 V V

–2 V V

NOTES

The single supply op amps of the AD694, lacking pull down current, may not reach 0.000 V at their outputs. For this reason, span, offset, and nonlinearity are

specified with the input amplifiers operating in their linear range. The input voltage used for the tests is 5 mV to 2 V and 5 mV to 10 V for the two precalibrated

input ranges. Span and zero accuracy are tested with the buffer amplifier configured as a follower.

Offset at 4 mA out and 0 mA out are extrapolated to 0.000 V input from measurements made at 5 mV and at full scale. See Note 1.

Nonlinearity is specified as the maximum deviation of the output, as a % of span, from a straight line drawn through the endpoints of the transfer function.

Voltage reference drift guaranteed by the Box Method. The voltage reference output over temperature will fall inside of a box whose length is determined by the

temperature range and whose height is determined by the maximum temperature coefficient multiplied by the temperature span in degrees C.

Devices tested at these temperatures with a pass transistor. Allowable temperature range of operation is dependent upon internal power dissipation. Absolute

maximum junction and case temperature should not be exceeded. See section: “Power Dissipation Considerations.”

Buffer amplifier specs for reference. Buffer amplifier offset and drift already included in Span and Zero accuracy specs above.

Specifications subject to change without notice.

PIN CONFIGURATION (N, R, Q PACKAGE)

AD694

REV. A

–3–

ABSOLUTE MAXIMUM RATINGS

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

to I

OUT

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +36 V

Input Voltage, (Either Input Pin 2 or 3) . . . . .–0.3 V to +36 V

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

Alarm Voltage, Pin 10 . . . . . . . . . . . . . . . . . . . . . . . . . . +36 V

4 mA Adj, Pin 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +1 V

4 mA On/Off, Pin 9 . . . . . . . . . . . . . . . . . . . . . . . . 0 V to 36 V

Storage Temperature Range

AD694Q . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to +150°C

AD694N, R . . . . . . . . . . . . . . . . . . . . . . . –65°C to +125°C

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

Maximum Junction Temperature . . . . . . . . . . . . . . . . . +150°C

Maximum Case Temperature

Plastic Package (N, R) . . . . . . . . . . . . . . . . . . . . . . . +125°C

Cerdip Package (Q) . . . . . . . . . . . . . . . . . . . . . . . . . +125°C

No pin, other than I

OUT

(11) and ±Sig (2), (3) as noted, may be permitted to become more negative than Com (5). No pin may be

permitted to become more positive than V

(13).

ORDERING GUIDE

Temperature Package

Model Range Option*

AD694JN 0°C to +70°C N-16

AD694AQ –40°C to +85°C Q-16

AD694AR –40°C to +85°C R-16

AD694BQ –40°C to +85°C Q-16

AD694BR –40°C to +85°C R-16

*N = Plastic DIP; Q = Cerdip, R = SOIC.

Transistor Count: . . . . . . . . . . . . . . . . . . . . .75 Active Devices

Substrate Connection: . . . . . . . . . . . . . . . . . . . . to Com, Pin 5

Thermal Characteristics:

Plastic (N) Package: θ

= 50°C/Watt

(Still Air) = 85°C/Watt

Cerdip (Q) Package: θ

= 30°C/Watt

(Still Air) = 70°C/Watt

Plastic (R) Package: θ

= 27°C/Watt

(Still Air) = 73°C/Watt

ESD Susceptibility

All pins are rated for a minimum of 4000 V protection, except

for Pins 2, 3 and 9 which are rated to survive a minimum of

1500 V. ESD testing conforms to Human Body Model. Always

practice ESD prevention.

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