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ADR512 데이터시트(PDF) 4 Page - Analog Devices

부품명 ADR512
상세설명  1.2 V Precision Low Noise Shunt Voltage Reference
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ADR512 데이터시트(HTML) 4 Page - Analog Devices

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REV. 0
–4–
ADR512
PARAMETER DEFINITIONS
Temperature Coefficient
This is the change of output voltage with respect to operating
temperature changes, normalized by the output voltage at 25
°C.
This parameter is expressed in ppm/
°C and can be determined
with the following equation:
TCV
ppm
C
VT
VT
VC
T
T
O
OO
O
°
 =
()()
°
()×−
()
×
21
21
6
25
10
(1)
where:
VO(25
°C) = V
O at 25
°C
VO(T1) = VO at Temperature 1
VO(T2) = VO at Temperature 2
Thermal Hysteresis
Thermal hysteresis is defined as the change of output voltage
after the device is cycled through the temperature from +25
°C to
–40
°C to +85°C and back to +25°C. This is a typical value from
a sample of parts put through such a cycle.
VV
C
V
V
ppm
VC
V
VC
O
HYS
O
O
TC
O
HYS
OO
TC
O
__
_
_
()
[] =
°
()
°
()
×
25
25
25
10
6
(2)
where:
VO(25
°C) = V
O at 25
°C
VO_TC = VO at 25
°C after temperature cycle at +25°C
to –40
°C to +85°C and back to +25°C
APPLICATIONS SECTION
The ADR512 is a 1.2 V precision shunt voltage reference. It
is designed to operate without an external output capacitor be-
tween the positive and negative terminals for stability. An external
capacitor can be used for additional filtering of the supply.
As with all shunt voltage references, an external bias resistor
(RBIAS) is required between the supply voltage and the ADR512
(see Figure 1). RBIAS sets the current that is required to pass
through the load (IL) and the ADR512 (IQ). The load and the
supply voltage can vary, thus RBIAS is chosen based on
• RBIAS must be small enough to supply the minimum IQ cur-
rent to the ADR512 even when the supply voltage is at its
minimum and the load current is at its maximum value.
• R
BIAS also needs to be large enough so that IQ does not
exceed 10 mA when the supply voltage is at its maximum
and the load current is at its minimum.
Given these conditions, RBIAS is determined by the supply
voltage (Vs), the load and operating current (IL and IQ) of the
ADR512, and the ADR512’s output voltage.
R(V
V
) (I
I )
BIAS
S
OUT
L
Q
=+
–/
(3)
∆IIN = 100 A
VOUT = 20mV/DIV
TIME (2 s/DIV)
TPC 7. Output Response to 100
µA Input Current
Change With 1
µF Capacitor
2 V/DIV
TIME (400ms/DIV)
TPC 8. 1 Hz to 10 Hz Noise


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