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AD1584ARTZ-REEL7 Scheda tecnica(PDF) 10 Page - Analog Devices

Il numero della parte AD1584ARTZ-REEL7
Spiegazioni elettronici  2.5 V to 5.0 V Micropower, Precision Series Mode Voltage References
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD1584ARTZ-REEL7 Scheda tecnica(HTML) 10 Page - Analog Devices

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AD1582/AD1583/AD1584/AD1585
Data Sheet
Rev. J | Page 10 of 16
THEORY OF OPERATION
The AD1582/AD1583/AD1584/AD1585 use the band gap
concept to produce stable, low temperature coefficient voltage
references suitable for high accuracy data acquisition compo-
nents and systems. These parts of precision references use the
underlying temperature characteristics of a silicon transistor’s
base emitter voltage in the forward-biased operating region.
Under this condition, all such transistors have a −2 mV/°C
temperature coefficient (TC) and a VBE that, when extrapolated
to absolute zero, 0 K (with collector current proportional to
absolute temperature), approximates the silicon band gap voltage.
By summing a voltage that has an equal and opposite tempera-
ture coefficient of 2 mV/°C with the VBE of a forward-biased
transistor, an almost 0 TC reference can be developed. In the
AD1582/AD1583/AD1584/AD1585 simplified circuit diagram
shown in Figure 9, such a compensating voltage, V1, is derived
by driving two transistors at different current densities and
amplifying the resultant VBE difference (∆VBE, which has a positive
TC). The sum of VBE and V1 (VBG) is then buffered and amplified
to produce stable reference voltage outputs of 2.5 V, 3 V, 4.096 V,
and 5 V.
R4
R6
R5
GND
V1
+
R3
+
R2
R1
VIN
VOUT
VBG
VBE
Figure 9. Simplified Schematic


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