ADR4520ARZ-R7 datasheet(29/32 Pages) AD

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Data Sheet

ADR4520/ADR4525/ADR4530/ADR4533/ADR4540/ADR4550

Rev. 0 | Page 29 of 32

TERMINOLOGY

Dropout Voltage (VDO)

Dropout voltage, sometimes referred to as supply voltage

headroom or supply output voltage differential, is defined as the

minimum voltage differential between the input and output such

that the output voltage is maintained to within 0.1% accuracy.

VDO = (VIN − VOUT)min|IL = constant

Because the dropout voltage depends on the current passing

through the device, it is always specified for a given load current.

In series mode devices, the dropout voltage typically increases

proportionally to the load current (see Figure 6, Figure 21,

Figure 37, Figure 52, Figure 67, and Figure 82).

Temperature Coefficient (TCVOUT)

The temperature coefficient relates the change in the output

voltage to the change in the ambient temperature of the device, as

normalized by the output voltage at 25°C. This parameter is

determined by the box method, which is represented by the

following equation:

)

(

)

(

)}

(

{

)}

(

{

−

OUT

min

max

TCV

where:

TCVOUT is expressed in ppm/°C.

VOUT(Tx) is the output voltage at Temperature Tx.

T1 = −40°C.

T2 = +25°C.

T3 = +125°C.

This three-point method ensures that TCVOUT accurately portrays

the maximum difference between any of the three temperatures

at which the output voltage of the part is measured.

The TCVOUT for the ADR4520/ADR4525/ADR4530/ADR4533/

ADR4540/ADR4550 is fully tested over three temperatures:

−40°C, +25°C, and +125°C.

Thermally Induced Output Voltage Hysteresis (ΔVOUT_HYS)

Thermally induced output voltage hysteresis represents the

change in the output voltage after the device is exposed to a

specified temperature cycle. This is expressed as either a shift in

voltage or a difference in ppm from the nominal output.

−

∆

OUT

HYS

OUT

[ppm]

where:

VOUT_25°C is the output voltage at 25°C.

VOUT_TC is the output voltage after temperature cycling.

Long-Term Stability (ΔVOUT_LTD)

Long-term stability refers to the shift in the output voltage at 60°C

after 1000 hours of operation in a 60°C environment. The ambient

temperature is kept at 60°C to ensure that the temperature chamber

does not switch randomly between heating and cooling, which

can cause instability over the 1000 hour measurement. This is

also expressed as either a shift in voltage or a difference in ppm

from the nominal output.

)

(

)

(

)

(

−

∆

OUT

LTD

OUT

[ppm]

where:

VOUT(t0) is the VOUT at 60°C at Time 0.

VOUT(t1) is the VOUT at 60°C after 1000 hours of operation at 60°C.

Line Regulation

Line regulation refers to the change in output voltage in response

to a given change in input voltage and is expressed in percent

per volt, ppm per volt, or μV per volt change in input voltage.

This parameter accounts for the effects of self-heating.

Load Regulation

Load regulation refers to the change in output voltage in response

to a given change in load current and is expressed in μV per mA,

ppm per mA, or ohms of dc output resistance. This parameter

accounts for the effects of self-heating.

Solder Heat Resistance (SHR) Shift

SHR shift refers to the permanent shift in output voltage that is

induced by exposure to reflow soldering and is expressed in units

of ppm. This shift is caused by changes in the stress exhibited

on the die by the package materials when these materials are

exposed to high temperatures. This effect is more pronounced

in lead-free soldering processes due to higher reflow temperatures.

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