AD1585ART-R2 Analog Devices Inc, AD1585ART-R2 Datasheet - Page 10

• Manufacturer Part Number: AD1585ART-R2
• Description: IC V-REF 5V SOT-23 TAPE & REEL
• Manufacturer: Analog Devices Inc

Specifications of AD1585ART-R2

• Rohs Status: RoHS non-compliant
• Reference Type: Series
• Voltage - Output: 5V
• Tolerance: ±1%
• Temperature Coefficient: 100ppm/°C
• Voltage - Input: 5.2 ~ 12 V
• Number Of Channels: 1
• Current - Quiescent: 70µA
• Current - Output: 5mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-3, TO-236-3, Micro3™, SSD3, SST3
• Current - Cathode: -

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