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參數(shù)資料
| 型號(hào)： | REF3333AIDCKT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 3.3 V, PDSO3 |
| 封裝： | GREEN, SC-70, 3 PIN |
| 文件頁數(shù)： | 20/20頁 |
| 文件大?。?/td> | 580K |
| 代理商： | REF3333AIDCKT |
www.ti.com
POWER DISSIPATION
APPLICATION CIRCUITS
T =T +P q
J
A
D
JA
(2)
NOISE PERFORMANCE
R
3
R
2
V
IN
+2.7V
Enable
(1)
OPA333,
OPA363,
OPA369
or
R
66.5
1
W
C
1.5nF
1
C
1 F
2
m
P1.2
VREF
A0+
REF3312
+2.7V
V
CC
V
SS
16-Bit
ADC
MSP430x20x3PW
SBOS392A – AUGUST 2007 – REVISED SEPTEMBER 2007
The REF33xx family is specified to deliver current
Figure 20 shows a simple application circuit where
loads of ±5mA over the specified input voltage range.
low-power components are used to create a signal
The temperature of the device increases according to
chain. The analog input signal is buffered with either
reference voltage created from REF3312 provides a
stable, high-accuracy, low-drift reference voltage to
the MSP430 using much less power than the
Where:
MSP430 internal reference. The reference voltage is
TJ = Junction temperature (°C)
used by the internal, 16-bit analog-to-digital converter
TA = Ambient temperature (°C)
(ADC) to accurately convert the analog input signal.
PD = Power dissipation (W)
The configuration in Figure 20 presents an example
Where PD = VIN × IQ + (VIN – VOUT) IOUT
of a unipolar signal chain.
θJA = Junction-to-ambient thermal resistance
An example of a bipolar configuration is illustrated in
(
°C/W)
Figure 21. The analog input signal (±2.5V) is offset
and attenuated so that it matches the analog input of
The REF33xx junction temperature must not exceed
the 16-bit ADC on the MSP430. The negative input of
the absolute maximum rating of +150
°C.
the ADC is offset by 0.62V, creating a digital code
that corresponds to the analog input voltage. In this
configuration, two reference voltages are used. The
Typical 0.1Hz to 10Hz voltage noise for each member
REF3312 creates a 1.25V reference input to the ADC
of the REF33xx family is specified in the Electrical
and is an offset point for the INA159. The same
Characteristics table. The noise voltage increases
voltage is used to create the offset voltage to the
with
output
voltage
and
operating
temperature.
negative input to the ADC. The REF3330 creates a
Additional filtering can be used to improve output
precise analog supply voltage of 3V. In this way, the
noise levels. Special attention should be taken to
high PSRR of the REF3330 helps to filter unwanted
ensure that the output impedance does not degrade
noise from the 3.3V digital supply.
output voltage accuracy.
(1)
Enable is a function of the OPA363 not available on the OPA333.
Figure 20. Unipolar Signal Chain Configuration
Copyright 2007, Texas Instruments Incorporated
9
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| REF3333AIDCKTG4 | 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 30ppm/C Drift 3.9uA Vltg Ref RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓?fù)浣Y(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準(zhǔn)確度:0.25 % 平均溫度系數(shù)（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
| REF3425IDBVR | 功能描述:REF3425 - 20 PPM/C IQ 85UA 制造商:texas instruments 系列:* 包裝:剪切帶（CT） 零件狀態(tài):在售 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商器件封裝:SOT-23-6 標(biāo)準(zhǔn)包裝:1 |
| REF401 | 制造商:General Tools 功能描述:GLYCOL REFRACTOMETER TO MEASURE FREEZING POINT (-60 TO 32 F) |
| REF43 | 制造商:AD 制造商全稱:Analog Devices 功能描述:+2.5V Low Power Precision Voltage Reference |
| REF-43 | 制造商:AD 制造商全稱:Analog Devices 功能描述:+2.5V Low Power Precision Voltage Reference |
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