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ADR280 датащи(PDF) 4 Page - Analog Devices

номер детали ADR280
подробное описание детали  1.2 V Ultralow Power High PSRR Voltage Reference
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
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ADR280 датащи(HTML) 4 Page - Analog Devices

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ADR280
–4–
ADR280
–5–
THEORY OF OPERATION
The ADR280 provides the basic core 1.2 V band gap reference.
It contains two NPN transistors, Q9 and Q17, with their emitter
areas scaled in a fixed ratio.The difference in their Vbes produces
a PTAT (proportional to absolute temperature) voltage that
cancels the CTAT (complementary to absolute temperature) Q9
Vbe voltage. As a result, a core band gap voltage that is almost a
constant 1.2 V over temperature is generated (see Figure 2). Preci-
sion laser trimming of the internal resistors and other proprietary
circuit techniques are used to enhance the initial accuracy, tem-
perature curvature, and temperature drift performance.
R1
R3
R5
R7
R9
Q17
Q9
Q18
R8
Q3
R6
Q5
Q6
R4
Q1
PNP3
R2
R12
Q2
Q10
R13 C1
Q7
R10
R11
V–
V+
VOUT
I1
Figure 2. Simplified Architecture
tS
1.2
1.0
0.8
0.6
0.4
0.2
0
2
4
6
8
10
12
14
16
18
20
0
TIME (ms)
TPC 7. SettlingTime
APPLICATIONS
The ADR280 should be decoupled with a 0.1 µF ceramic cap at
the output for optimum stability. It is also good practice to
include 0.1 µF ceramic caps at the IC supply pin.These capaci-
tors should be mounted close to their respective pins (see Figure 3).
V+
VOUT
0.1F
0.1F
V–
ADR280
Figure 3. Basic Configuration
The low supply voltage input pin V– can be elevated above
ground; a 1.2 V differential voltage can therefore be established
above V– (see Figure 4).
V+
VOUT
0.1F
0.1F
V–
ADR280
5V
1.2V
2.5V
Figure 4. Floating References
REV. A
REV. A


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