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參數資料
| 型號： | ADR512 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 1.2 V Precision Low Noise Shunt Voltage Reference |
| 中文描述： | 1.2 V精密低噪聲并聯電壓參考 |
| 文件頁數： | 4/8頁 |
| 文件大小： | 208K |
| 代理商： | ADR512 |
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:
°
(
25
where:
V
O
(
25
°
C)
=
V
O
at 25
°
C
V
O
(T
1
)
=
V
O
at Temperature 1
V
O
(T
2
)
=
V
O
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.
V
V
C
V
O
HYS
O
O TC
_
_
=
°
(
[
(
25
where:
V
O
(
25
°
C)
=
V
O
at 25
°
C
V
O_TC
=
V
O
at 25
°
C after temperature cycle at +25
°
C
to –40
°
C to +85
°
C and back to +25
°
C
TCV
ppm
C
°
V T
V T
T
)
×
V
C
T
O
O
=
2
(
)
×
2
1
1
6
10
(1)
V
ppm
V
C
°
V
C
°
V
O
HYS
O
O TC
_
O
_
)
(
25
]
=
)
×
25
10
6
(2)
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
(R
BIAS
) is required between the supply voltage and the ADR512
(see Figure 1). R
BIAS
sets the current that is required to pass
through the load (I
L
) and the ADR512 (I
Q
). The load and the
supply voltage can vary, thus R
BIAS
is chosen based on
R
BIAS
must be small enough to supply the minimum I
Q
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 I
Q
does not
exceed 10 mA when the supply voltage is at its maximum
and the load current is at its minimum.
Given these conditions, R
BIAS
is determined by the supply
voltage (Vs), the load and operating current (I
L
and I
Q
) of the
ADR512, and the ADR512’s output voltage.
R
(V
V
) (I
/
I )
BIAS
S
OUT
L
=
+
–
(3)
I
IN
= 100 A
V
OUT
= 20mV/DIV
TIME (2 s/DIV)
TPC 7. Output Response to 100
μ
A Input Current
Change With 1
μ
F Capacitor
2 V/DIV
TIME (400ms/DIV)
TPC 8. 1 Hz to 10 Hz Noise
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相關代理商/技術參數 |
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| ADR512ART-R2 | 功能描述:IC VREF SHUNT PREC 1.2V SOT-23-3 RoHS:否 類別:集成電路 (IC) >> PMIC - 電壓基準 系列:- 標準包裝:3,000 系列:- 基準類型:旁路，精度 輸出電壓:5V 容差:±0.5% 溫度系數:100ppm/°C 輸入電壓:- 通道數:1 電流 - 陰極:80µA 電流 - 靜態:- 電流 - 輸出:15mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:TO-236-3，SC-59，SOT-23-3 供應商設備封裝:SOT-23-3 包裝:帶卷 (TR) 其它名稱:LM4040CIM3-5.0MLTRLM4040CIM3-5.0MLTR-ND |
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