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參數(shù)資料
| 型號(hào)： | OPA2333AIDRG4 |
| 英文描述： | 1.8V, microPOWER CMOS OPERATIONAL AMPLIFIERS Zer-PI Drift Series |
| 中文描述： | 1.8，微CMOS運(yùn)算放大器澤爾聚酰亞胺漂移系列 |
| 文件頁數(shù)： | 8/18頁 |
| 文件大?。?/td> | 478K |
| 代理商： | OPA2333AIDRG4 |
"""
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SBOS351 MARCH 2006
www.ti.com
8
ACHIEVING OUTPUT SWING TO THE OP
AMP NEGATIVE RAIL
Some applications require output voltage swings from 0V
to a positive full-scale voltage (such as +2.5V) with
excellent accuracy. With most single-supply op amps,
problems arise when the output signal approaches 0V,
near the lower output swing limit of a single-supply op amp.
A good single-supply op amp may swing close to
single-supply ground, but will not reach ground. The output
of the OPA333 and OPA2333 can be made to swing to
ground, or slightly below, on a single-supply power source.
To do so requires the use of another resistor and an
additional, more negative, power supply than the op amp
negative supply. A pull-down resistor may be connected
between the output and the additional negative supply to
pull the output down below the value that the output would
otherwise achieve, as shown in Figure 2.
V
OUT
R
P
= 20k
Op Amp V
= Gnd
OPA333
V
IN
V+ = +5V
5V
Additional
Negative
Supply
Figure 2. For V
OUT
Range to Ground
The OPA333 and OPA2333 have an output stage that
allows the output voltage to be pulled to its negative supply
rail, or slightly below, using the technique previously
described. This technique only works with some types of
output stages. The OPA333 and OPA2333 have been
characterized to perform with this technique; however, the
recommended resistor value is approximately 20k
. Note
that this configuration will increase the current
consumption by several hundreds of microamps.
Accuracy is excellent down to 0V and as low as 2mV.
Limiting and nonlinearity occurs below2mV, but excellent
accuracy returns as the output is again driven above
2mV. Lowering the resistance of the pull-down resistor
will allow the op amp to swing even further below the
negative rail. Resistances as low as 10k
can be used to
achieve excellent accuracy down to 10mV.
GENERAL LAYOUT GUIDELINES
Attention
to
good
recommended. Keep traces short and, when possible, use
a printed circuit board (PCB) ground plane with
surface-mount components placed as close to the device
pins as possible. Place a 0.1
μ
F capacitor closely across
the supply pins. These guidelines should be applied
throughout the analog circuit to improve performance and
provide
benefits
such
(electromagnetic-interference) susceptibility.
layout
practices
is
always
as
reducing
the
EMI
Operational amplifiers vary in their susceptibility to radio
frequency interference (RFI). RFI can generally be
identified as a variation in offset voltage or dc signal levels
with changes in the interfering RF signal. The OPA333 has
been specifically designed to minimize susceptibility to
RFI and demonstrates remarkably low sensitivity
compared to previous generation devices. Strong RF
fields may still cause varying offset levels..
+
+
+
+
4.096V
0.1
μ
F
+5V
Zero Adj.
KType
Thermocouple
40.7
μ
V/ C
R
2
549
R
9
150k
R
31.6k
R
6.04k
R
6
200
+5V
0.1
μ
F
R
2.94k
V
O
R
60.4
R
6.04k
OPA333
D1
REF3140
Figure 3. Temperature Measurement
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|---|---|
| OPA2333 | 1.8V, microPOWER CMOS OPERATIONAL AMPLIFIERS Zer-PI Drift Series |
| OPA2333AID | 1.8V, microPOWER CMOS OPERATIONAL AMPLIFIERS Zer-PI Drift Series |
| OPA2335AIDGKR | 0.05UV/∑C max, SINGLE-SUPPLY CMOS OPERATIONAL AMPLIFIERS |
| OPA2334 | 0.05UV/∑C max, SINGLE-SUPPLY CMOS OPERATIONAL AMPLIFIERS |
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|---|---|
| OPA2333AMDREP | 功能描述:運(yùn)算放大器 - 運(yùn)放 Mil Enhance 1.8V Micropwr CMOS Op Amp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| OPA2333AMDREPG4 | 功能描述:運(yùn)算放大器 - 運(yùn)放 EP MICROPWR CHOPPER STABILIZED OP AMP RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| OPA2333AQDGKRQ1 | 功能描述:運(yùn)算放大器 - 運(yùn)放 1.8V17uA2uVmicro PWR CMOS 0-Drift RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| OPA2333AQDRQ1 | 功能描述:運(yùn)算放大器 - 運(yùn)放 1.8V,17uA,2uV,micro Pwr CMOS 0-Drift Ser RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| OPA2333HD | 功能描述:運(yùn)算放大器 - 運(yùn)放 Hi Temperature 1.8-V MicroPWR CMOS Op Amp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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