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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： | 5/8頁 |
| 文件大小： | 208K |
| 代理商： | ADR512 |
REV. 0
ADR512
–5–
Adjustable Precision Voltage Source
The ADR512, combined with a precision low input bias op amp
such as the AD8610, can be used to output a precise adjustable
voltage. Figure 2 illustrates the implementation of this application
using the ADR512.
The output of the op amp, V
OUT
, is determined by the gain of the
circuit, which is completely dependent on resistors R2 and R1.
V
R
R
OUT
= +
1
2
1
(4)
An additional capacitor in parallel with R2 can be added to filter
out high frequency noise. The value of C2 is dependent on the
value of R2.
V
OUT
= 1.2(1 + R2/R1)
R
BIAS
R1
V
CC
R2
AD8610
ADR512
1.2V
C2 (OPTIONAL)
Figure 2. Adjustable Precision Voltage Source
Output Voltage Trim
Using a mechanical or digital potentiometer, the output voltage
of the ADR512 can be trimmed
±
0.5%. The circuit in Figure 3
illustrates how the output voltage can be trimmed, using a 10 k
potentiometer.
R
BIAS
V
CC
R1
100k
POT
50k
ADR512
V
OUT
Figure 3. Output Voltage Trim
Using the ADR512 with Precision Data Converters
The compact ADR512 package and the device’s low minimum
operating current requirement make it ideal for use in battery-
powered portable instruments, such as the AD7533 CMOS
multiplying DAC, that use precision data converters.
Figure 4 shows the ADR512 serving as an external reference to
the AD7533, a CMOS multiplying DAC. Such a DAC requires
a negative voltage input in order to provide a positive output
range. In this application, the ADR512 is supplying a –1.2 V
reference to the REF input of the AD7533.
MSB
V
DD
V
OUT
= 0V TO 1.2V
–V
DD
G
N
LSB
1
2
3
1
1
15
0
9
R2
ADR512
AD7533
Figure 4. ADR512 as a Reference for a 10-Bit
CMOS DAC (AD7533)
Precise Negative Voltage Reference
The ADR512 is suitable for use in applications where a precise
negative voltage reference is desired, including the application
detailed in Figure 4.
Figure 5 shows the ADR512 configured to provide a –1.2 V output.
–1.2V
–
–V
DD
R1
ADR512
Figure 5. Precise –1.2 V Reference Configuration
Since the ADR512 characteristics resemble those of a Zener diode,
the cathode shown in Figure 5 will be 1.2 V higher with respect
to the anode (V+ with respect to V– on the ADR512 package).
Since the cathode of the ADR512 is tied to ground, the anode
must be –1.2 V.
R1 in Figure 5 should be chosen so that 100
μ
A to 10 mA is
provided to properly bias the ADR512.
V
I
The resistor R1 should be chosen so that power dissipation is at
a minimum. An ideal resistor value can be determined through
manipulation of Equation 5.
R
DD
1
=
(5)
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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 |
| ADR512ART-REEL7 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| ADR512ARTZ-REEL7 | 功能描述:IC VREF SHUNT PREC 1.2V SOT-23-3 RoHS:是 類別:集成電路 (IC) >> PMIC - 電壓基準 系列:- 產品培訓模塊:Voltage Reference Basics 標準包裝:100 系列:- 基準類型:旁路，精度 輸出電壓:4.096V 容差:±0.075% 溫度系數:50ppm/°C 輸入電壓:- 通道數:1 電流 - 陰極:1µA 電流 - 靜態:- 電流 - 輸出:10mA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:8-SOIC 包裝:管件 |
| ADR512WARTZ-R7 | 功能描述:IC VREF SHUNT PREC 1.2V SOT-23-3 RoHS:是 類別:集成電路 (IC) >> PMIC - 電壓基準 系列:- 產品培訓模塊:Voltage Reference Basics 標準包裝:100 系列:- 基準類型:旁路，精度 輸出電壓:4.096V 容差:±0.075% 溫度系數:50ppm/°C 輸入電壓:- 通道數:1 電流 - 陰極:1µA 電流 - 靜態:- 電流 - 輸出:10mA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:8-SOIC 包裝:管件 |
| ADR520 | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Precision Shunt Mode Voltage References |
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