ad1582crt-reel7 Analog Devices, Inc., ad1582crt-reel7 Datasheet - Page 10

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ad1582crt-reel7

Manufacturer Part Number
ad1582crt-reel7
Description
2.5 V To 5.0 V Micropower, Precision Series Mode Voltage References
Manufacturer
Analog Devices, Inc.
Datasheet
AD1582/AD1583/AD1584/AD1585
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 V
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 V
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 V
TC). The sum of V
to produce stable reference voltage outputs of 2.5 V, 3 V, 4.096 V,
and 5 V.
BE
and V1 (V
BE
difference (ΔV
BG
) is then buffered and amplified
BE
BE
that, when extrapolated
of a forward-biased
BE
, which has a positive
Rev. H | Page 10 of 16
V
BE
R3
R2
R1
+
V1
+
Figure 9. Simplified Schematic
R4
R5
V
R6
BG
GND
V
V
IN
OUT

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