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AD589UH

Two-Terminal IC 1.2 V Reference

Analog Devices 

Understanding the Specifications–AD589

VOLTAGE VARIATION VS. TEMPERATURE

Some confusion exists in the area of defining and specifying

reference voltage error over temperature. Historically, references

have been characterized using a maximum deviation per degree

Centigrade; i.e., 10 ppm/°C. However, because of nonlinearities

in temperature characteristics, which originated in standard

Zener references (such as “S” type characteristics) most

manufacturers have begun to use a maximum limit error band

approach to specify devices. This technique involves measure-

ment of the output at 3, 5 or more different temperatures to

guarantee that the output voltage will fall within the given error

band. The temperature characteristics of the AD589 consis-

tently follows the curve shown in Figure 1. Three-point

measurement guarantees the error band over the specified

temperature range. The temperature coefficients specified on

the previous page represent the slopes of the diagonals of the

error band from +25°C to TMIN and +25°C to TMAX.

DYNAMIC PERFORMANCE

Many low power instrument manufacturers are becoming

increasingly concerned with the turn-on characteristics of the

components being used in their systems. Fast turn-on compo-

nents often enable the end user to keep power off when not

needed, and yet respond quickly when the power is turned on

for operation. Figure 3 displays the turn-on characteristics of the

AD589. This characteristic is generated from cold-start opera-

tion and represents the true turn-on waveform after an extended

period with the supplies off. The figure shows both the coarse

and fine transient characteristics of the device; the total settling

time to within ± 1 millivolt is about 25 µs, and there is no long

thermal tail appearing after that point.

200mV

100

90

10mV

10µs

1.2370

1.2365

1.2360

1.2355

1.2350

1.2345

–50

–25

0

+25

+50

+75

TEMPERATURE – °C

+100 +125

Figure 1. Typical AD589 Temperature Characteristics

1000

100

10

0%

Figure 3. Output Settling Characteristics

+V

R1

R5

Q5

R2

Q3

Q4

R3

Q1

R4

–V

R6

R7

C1

Q8

Q9

Q7

Q2

Figure 4. Schematic Diagram

10

0

10

100

1k

10k

100k

1M

FREQUENCY – Hz

Figure 2. Noise Spectral Density

REV.B

–3–

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