x 0.1

= Percent_Error

x 10

3

x 10

3

2

n

10

3

x 10

LM4128, LM4128Q

SNVS475E – NOVEMBER 2006 – REVISED APRIL 2013

www.ti.com

Temperature coefficient may be expressed analytically as the following:

where

•

•

•

•

•

ΔT = Operating temperature range

(3)

The LM4128 features a low temperature drift of 75 ppm (max) to 100 ppm (max), depending on the grade, from -

40°C to 125°C.

LONG TERM STABILITY

Long-term stability refers to the fluctuation in output voltage over a long period of time (1000 hours). The LM4128

features a typical long-term stability of 50 ppm over 1000 hours. The measurements are made using 5 units of

each voltage option, at a nominal input voltage (5V), with no load, at room temperature.

EXPRESSION OF ELECTRICAL CHARACTERISTICS

Electrical characteristics are typically expressed in mV, ppm, or a percentage of the nominal value. Depending

on the application, one expression may be more useful than the other. To convert one quantity to the other one

may apply the following:

ppm to mV error in output voltage:

where

•

(4)

Bit error (1 bit) to voltage error (mV):

where

•

•

•

and n is the number of bits

(5)

mV to ppm error in output voltage:

where

•

•

(6)

Voltage error (mV) to percentage error (percent):

where

•

•

(7)

14

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