AD588_15 datasheet(6/20 Pages) AD

Teilenummer	AD588

Bauteilbeschribung	Multiple Output, High Precision, Dual-Tracking Reference

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Hersteller	AD [Analog Devices]

Direct Link	http://www.analog.com

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AD588

Rev. L | Page 6 of

20

THEORY OF OPERATION

The AD588 consists of a buried Zener diode reference,

amplifiers used to provide pin programmable output ranges,

and associated thin-film resistors, as shown in Figure 3. The

temperature compensation circuitry provides the device with

a temperature coefficient of 1.5 ppm/°C or less.

Amplifier A1 performs several functions. A1 primarily acts to

amplify the Zener voltage from 6.5 V to the required 10 V

output. In addition, A1 provides for external adjustment of the

10 V output through Pin 5, GAIN ADJ. Using the bias

compensation resistor between the Zener output and the

noninverting input to A1, a capacitor can be added at the

NOISE REDUCTION pin (Pin 7) to form a low-pass filter and

reduce the noise contribution of the Zener to the circuit. Two

matched 10 kΩ nominal thin-film resistors (R4 and R5) divide

the 10 V output in half. Pin VCT (Pin 11) provides access to the

center of the voltage span and BAL ADJ (Pin 12) can be used

for fine adjustment of this division.

Ground sensing for the circuit is provided by Amplifier A2. The

noninverting input (Pin 9) senses the system ground, which is

transferred to the point on the circuit where the inverting input

(Pin 10) is connected. This can be Pin 6, Pin 8, or Pin 11. The

output of A2 drives Pin 8 to the appropriate voltage. Thus, if

Pin 10 is connected to Pin 8, the VLOW pin is the same voltage as

the system ground. Alternatively, if Pin 10 is connected to the

VCT pin, it is a ground; and Pin 6 and Pin 8 are +5 V and −5 V,

respectively.

Amplifier A3 and Amplifier A4 are internally compensated and

are used to buffer the voltages at Pin 6, Pin 8, and Pin 11, as well

as to provide a full Kelvin output. Thus, the AD588 has a full

Kelvin capability by providing the means to sense a system

ground and provide forced and sensed outputs referenced to

that ground.

Note that both positive and negative supplies are required for

operation of the AD588.

R3

RB

R1

R2

R4

R5

R6

GAIN

ADJ

GND

SENSE

+IN

GND

SENSE

–IN

VLOW BAL

ADJ

VCT A4 IN

–VS

+VS

A4 OUT

FORCE

A4 OUT

SENSE

A3 OUT

FORCE

A3 OUT

SENSE

A3 IN

VHIGH

NOISE

REDUCTION

A1

A4

AD588

A2

A3

13

11

12

8

10

9

5

1

14

15

2

16

3

4

6

7

Figure 3. AD588 Functional Block Diagram

Ähnliche Beschreibung - AD588_15

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