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參數資料
| 型號： | ADR363 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Low Power, Low Noise Voltage References with Sink/Source Capability |
| 中文描述： | 低功耗，低噪聲電壓與水槽參考/源能力 |
| 文件頁數： | 16/20頁 |
| 文件大小： | 539K |
| 代理商： | ADR363 |
ADR360/ADR361/ADR363/ADR364/ADR365/ADR366
THEORY OF OPERATION
Band gap references are the high performance solution for low
supply voltage and low power voltage reference applications,
and the ADR36x family is no exception. The uniqueness of
these products lies in their architecture. The ideal zero TC band
gap voltage is referenced to the output not to ground (see
Figure 32). Therefore, if noise exists on the ground line, it is
greatly attenuated on V
OUT
. The band gap cell consists of the
PNP pair Q53 and Q52 running at unequal current densities.
The difference in V
BE
results in a voltage with a positive TC,
which is amplified by a ratio of
R59
2
×
Rev. A | Page 16 of 20
R54
This PTAT voltage, combined with the V
BE
s of Q53 and Q52,
produces the stable band gap voltage.
Reduction in the band gap curvature is performed by the ratio
of Resistor R44 and Resistor R59, one of which is linearly
temperature dependent. Precision laser trimming and other
patented circuit techniques are used to further enhance the drift
performance.
R60
Q53
R54
R61
R53
Q52
R58
R59
R44
R50
30k
Q2
0
R101
Q61
R100
Q60
Q1
R48
R49
62k
V
OUT (FORCE)
V
OUT (SENSE)
TRIM
Figure 32. Simplified Schematic
DEVICE POWER DISSIPATION CONSIDERATIONS
The ADR36x family is capable of delivering load currents to
5 mA with an input voltage ranging from 2.348 V (ADR360
only) to 18 V. When this device is used in applications with
large input voltages, care should be taken to avoid exceeding the
specified maximum power dissipation or junction temperature
because it could result in premature device failure. Use the
following formula to calculate a device’s maximum junction
temperature or dissipation:
T
T
P
=
JA
A
J
D
θ
In this equation,
T
J
and
T
A
are, respectively, the junction and
ambient temperatures,
P
D
is the device power dissipation, and
θ
JA
is the device package thermal resistance.
INPUT CAPACITOR
Input capacitors are not required on the ADR36x. There is no
limit for the value of the capacitor used on the input, but a 1 μF
to 10 μF capacitor on the input improves transient response in
applications where the supply suddenly changes. An additional
0.1 μF capacitor in parallel also helps reduce noise from the supply.
OUTPUT CAPACITOR
The ADR36x does not require output capacitors for stability
under any load condition. An output capacitor, typically 0.1 μF,
filters out any low level noise voltage and does not affect the
operation of the part. On the other hand, the load transient
response can improve with an additional 1 μF to 10 μF output
capacitor in parallel. A capacitor here acts as a source of stored
energy for a sudden increase in load current. The only
parameter that degrades by adding an output capacitor is the
turn-on time. The degradation depends on the size of the
capacitor chosen.
相關PDF資料 |
PDF描述 |
|---|---|
| ADR363A | Low Power, Low Noise Voltage References with Sink/Source Capability |
| ADR363AUJZ-REEL7 | Low Power, Low Noise Voltage References with Sink/Source Capability |
| ADR363B | Low Power, Low Noise Voltage References with Sink/Source Capability |
| ADR363BUJZ-REEL7 | Low Power, Low Noise Voltage References with Sink/Source Capability |
| ADR364 | Low Power, Low Noise Voltage References with Sink/Source Capability |
相關代理商/技術參數 |
參數描述 |
|---|---|
| ADR363A | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Power, Low Noise Voltage References with Sink/Source Capability |
| ADR363AUJZ-R2 | 功能描述:IC VREF SERIES PREC 3V TSOT-23-5 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 |
| ADR363AUJZ-R2 | 制造商:Analog Devices 功能描述:IC, SERIES V-REF, 3V, 6mV, TSOT-5 |
| ADR363AUJZ-REEL7 | 功能描述:IC VREF SERIES PREC 3V TSOT-23-5 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 |
| ADR363B | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Power, Low Noise Voltage References with Sink/Source Capability |
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