AD1582WBRTZ-R7 datasheet(13/17 Pages) AD

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Data Sheet

AD1582/AD1583/AD1584/AD1585

Rev. M | Page 13 of 17

OUTPUT VOLTAGE HYSTERESIS

High performance industrial equipment manufacturers can

require the AD1582/AD1583/AD1584/AD1585 to maintain a

consistent output voltage error at 25°C after the references are

operated over the full temperature range. All references exhibit

a characteristic known as output voltage hysteresis; however, the

AD1582/AD1583/AD1584/AD1585 are designed to minimize

this characteristic. This phenomenon can be quantified by

measuring the change in the +25°C output voltage after

temperature excursions from +125°C to +25°C and from −40°C

to +25°C. Figure 13 displays the distribution of the

AD1582/AD1583/AD1584/AD1585 output voltage hysteresis.

–700

–450

–200

300

550

ppm

Figure 13. Output Voltage Hysteresis Distribution

SOLDER HEAT EFFECT

The mechanical stress and heat effect of soldering a device to a

printed circuit board (PCB) can cause the output voltage of a

reference to shift in value. The materials that make up a

semiconductor device and its package have different rates of

expansion and contraction. If the stress on the die has changed

position, it can cause a shift on the output voltage after being

exposed to extreme soldering temperatures. This shift is similar

to, but more severe than, thermal hysteresis. Typical result

of soldering temperature effects on the AD1582/AD1583/

AD1584/AD1585 output values shift is shown in Figure 14.

Figure 14 shows the output shift due to soldering and does not

include mechanical stress.

OUTPUT SHFT DUE TO SOLDER HEAT EFFECT (%)

–0.20

–0.15

–0.10

–0.05

0.05

0.10

0.15

0.20

Figure 14. Output Shift due to Solder Heat Effect

SUPPLY CURRENT VS. TEMPERATURE

The quiescent current for the AD1582/AD1583/AD1584/

AD1585 varies slightly over temperature and input supply

range. Figure 15 illustrates the typical performance for the

AD1582/AD1583/AD1584/AD1585 reference when varying

both temperature and supply voltage. As is evident from

Figure 15, the AD1582/AD1583/AD1584/AD1585 supply

current increases only 1.0 µA/V, making this device extremely

attractive for use in applications where there can be wide

variations in supply voltage and a need to minimize power

dissipation.

100

VIN (V)

TA = +25°C

TA = +85°C

TA = –40°C

Figure 15. Typical Supply Current over Temperature

SUPPLY VOLTAGE

One of the ideal features of the AD1582/AD1583/AD1584/AD1585

is low supply voltage headroom. The parts can operate at supply

voltages as low as 200 mV above VOUT and up to 12 V. However,

if negative voltage is inadvertently applied to VIN with respect to

ground, or any negative transient >5 V is coupled to VIN, the

device can be damaged.

AC PERFORMANCE

To apply the AD1582/AD1583/AD1584/AD1585, it is impor-

tant to understand the effects of dynamic output impedance

and power supply rejection. In Figure 16, a voltage divider

is formed by the AD1582/AD1583/AD1584/ AD1585 output

impedance and by the external source impedance. Figure 17

shows the effect of varying the load capacitor on the reference

output. Power supply rejection ratio (PSRR) should be determined

when characterizing the ac performance of a series voltage

reference. Figure 18 shows a test circuit used to measure PSRR,

and Figure 19 demonstrates the ability of the AD1582/AD1583/

AD1584/AD1585 to attenuate line voltage ripple.

5µF

1µF

2 × VOUT

10k

Ω

10k

Ω

10k

Ω

±2V

±100µA

×1

VLOAD DC

DUT

Figure 16. Output Impedance Test Circuit

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