AD5662_15 datasheet(19/24 Pages) AD

Part #	AD5662

Description	2.7 V to 5.5 V, 250 A, Rail-to-Rail Output 16-Bit nanoDACT in a SOT-23

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AD5662

Rev. A | Page 19 of 24

BIPOLAR OPERATION USING THE AD5662

The AD5662 has been designed for single-supply operation,

but a bipolar output range is also possible using the circuit in

Figure 42. The circuit gives an output voltage range of ±5 V.

Rail-to-rail operation at the amplifier output is achievable using

an AD820 or an OP295 as the output amplifier.

The output voltage for any input code can be calculated as

follows:

⎥

⎦

⎤

⎢

⎣

⎡

⎟

⎠

⎞

⎜

⎝

⎛

×

−

⎟

⎠

⎞

⎜

⎝

⎛

+

×

⎟

⎠

⎞

⎜

⎝

⎛

×

=

R1

R2

V

R1

R2

R1

D

V

DD

O

536

,

65

where D represents the input code in decimal (0 to 65,535).

With VDD = 5 V, R1 = R2 = 10 kΩ,

V

5

536

,

65

10

−

⎟

⎠

⎞

⎜

⎝

⎛

×

=

D

VO

This is an output voltage range of ±5 V, with 0x0000 corre-

sponding to a −5 V output, and 0xFFFF corresponding to a

+5 V output.

R2 = 10k

Ω

+5V

–5V

AD820/

OP295

THREE-WIRE

SERIAL

INTERFACE

+5V

AD5662

VREF

VOUT

VFB

R1 = 10k

Ω

±5V

0.1

μF

10

μF

Figure 42. Bipolar Operation with the AD5662

USING THE AD5662 AS AN ISOLATED,

PROGRAMMABLE, 4-20 mA PROCESS

CONTROLLER

In many process control system applications, 2-wire current

transmitters are used to transmit analog signals through noisy

environments. These current transmitters use a zero-scale

signal current of 4 mA that can power the transmitter’s signal

conditioning circuitry. The full-scale output signal in these

transmitters is 20 mA. The converse approach to process

control can also be used; a low-power, programmable current

source can be used to control remotely located sensors or

devices in the loop.

A circuit that performs this function is shown in Figure 43.

Using the AD5662 as the controller, the circuit provides a

programmable output current of 4 mA to 20 mA, proportional

to the DAC’s digital code. Biasing for the controller is provided

by the ADR02 and requires no external trim for two reasons:

(1) the ADR02’s tight initial output voltage tolerance and (2)

the low supply current consumption of both the AD8627 and

the AD5662. The entire circuit, including opto-couplers,

consumes less than 3 mA from the total budget of 4 mA. The

AD8627 regulates the output current to satisfy the current

summation at the noninverting node of the AD8627.

IOUT = 1/R7 (VDAC × R3/R1 + VREF × R3/R2)

For the values shown in Figure 43,

IOUT = 0.2435 μA × D + 4 mA

where D = 0 ≤ D ≤ 65535, giving a full-scale output current of

20 mA when the AD5662’s digital code equals 0xFFFF. Offset

trim at 4 mA is provided by P2, and P1 provides the circuit’s

gain trim at 20 mA. These two trims do not interact because

the noninverting input of the AD8627 is at virtual ground. The

Schottky diode, D1, is required in this circuit to prevent loop

supply power-on transients from pulling the noninverting input

of the AD8627 more than 300 mV below its inverting input.

Without this diode, such transients could cause phase reversal

of the AD8627 and possible latch-up of the controller. The loop

supply voltage compliance of the circuit is limited by the maxi-

mum applied input voltage to the ADR02 and is from 12 V to

40 V.

SERIAL

LOAD

AD5662

VLOOP

12V TO 36V

4mA TO 20mA

AD8627

R1

4.7k

Ω

R2

18.5k

Ω

P1

20mA

ADJUST

P2

4mA

ADJUST

R6

3.3k

Ω

R3

1.5k

Ω

D1

Q1

2N3904

R7

100

Ω

RL

ADR02

Figure 43. Programmable 4–20 mA Process Controller

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