LM4128AMF-4 Datasheet, PDF (14/33 Pages) Texas Instruments – LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference

LM4128, LM4128Q
SNVS475E – NOVEMBER 2006 – REVISED APRIL 2013
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Temperature coefficient may be expressed analytically as the following:
T_D =
(V_{REF_MAX} - V_{REF_MIN})
V_REF x 'T
x
10⁶
ppm
where
• T_D = Temperature drift
• V_REF = Nominal preset output voltage
• V_{REF_MIN} = Minimum output voltage over operating temperature range
• V_{REF_MAX} = Maximum output voltage over operating temperature range
• 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:
V_REF x ppm_ERROR
10³
= V_ERROR
where
• V_REF is in volts (V) and V_ERROR is in milli-volts (mV)
(4)
Bit error (1 bit) to voltage error (mV):
V_REF
2ⁿ
x 10³
= V_ERROR
where
• V_REF is in volts (V)
• V_ERROR is in milli-volts (mV)
• and n is the number of bits
(5)
mV to ppm error in output voltage:
V_ERROR
V_REF
x 10³ _{= ppmERROR}
where
• V_REF is in volts (V)
• V_ERROR is in milli-volts (mV)
(6)
Voltage error (mV) to percentage error (percent):
V_{ERROR x 0.1 = Percent_Error}
V_REF
where
• V_REF is in volts (V)
• V_ERROR is in milli-volts (mV)
(7)
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