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OP27GS 参数 Datasheet PDF下载

OP27GS图片预览
型号: OP27GS
PDF下载: 下载PDF文件 查看货源
内容描述: 低噪声,高精度运算放大器 [Low-Noise, Precision Operational Amplifier]
分类和应用: 运算放大器光电二极管
文件页数/大小: 16 页 / 366 K
品牌: ADI [ ADI ]
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OP27  
2.4  
2.2  
2.0  
1.8  
1.6  
1.4  
1.2  
1.0  
0.8  
0.1F  
T
V
= 25C  
= 15V  
A
S
100kꢅ  
1 SEC/DIV  
120  
80  
OP27  
D.U.T.  
10ꢅ  
40  
2kꢅ  
0
VOLTAGE  
GAIN  
22F  
4.3kꢅ  
2.2F  
40  
90  
120  
OP12  
100kꢅ  
= 50,000  
SCOPE 1  
= 1Mꢅ  
R
IN  
4.7F  
0.6  
0.4  
110kꢅ  
0.1F  
24.3kꢅ  
0.1Hz to 10Hz p-p NOISE  
100  
1k  
10k  
100k  
LOAD RESISTANCE ꢅ  
TPC 28. Voltage Noise Test Circuit  
(0.1 Hz to 10 Hz)  
TPC 29. Open-Loop Voltage Gain vs.  
Load Resistance  
TPC 30. Low-Frequency Noise  
160  
T
= 25C  
A
140  
120  
100  
80  
60  
40  
20  
0
NEGATIVE  
SWING  
POSITIVE  
SWING  
1
10 100 1k 10k 100k 1M 10M 100M  
FREQUENCY Hz  
TPC 31. PSRR vs. Frequency  
APPLICATION INFORMATION  
approximately (VOS/300) µV/°C. For example, the change in  
TCVOS will be 0.33 µV/°C if VOS is adjusted to 100 µV. The  
offset voltage adjustment range with a 10 kpotentiometer is  
4 mV. If smaller adjustment range is required, the nulling  
sensitivity can be reduced by using a smaller pot in conjuction  
with fixed resistors. For example, the network below will have a  
280 µV adjustment range.  
OP27 series units may be inserted directly into 725 and OP07  
sockets with or without removal of external compensation or  
nulling components. Additionally, the OP27 may be fitted to  
unnulled 741-type sockets; however, if conventional 741 nulling  
circuitry is in use, it should be modified or removed to ensure  
correct OP27 operation. OP27 offset voltage may be nulled to  
zero (or another desired setting) using a potentiometer (see  
Offset Nulling Circuit).  
4.7kꢅ  
1kPOT  
4.7kꢅ  
8
1
The OP27 provides stable operation with load capacitances of  
up to 2000 pF and 10 V swings; larger capacitances should be  
decoupled with a 50 resistor inside the feedback loop. The  
OP27 is unity-gain stable.  
V+  
Figure 2.  
Thermoelectric voltages generated by dissimilar metals at the  
input terminal contacts can degrade the drift performance. Best  
operation will be obtained when both input contacts are main-  
tained at the same temperature.  
NOISE MEASUREMENTS  
To measure the 80 nV peak-to-peak noise specification of the  
OP27 in the 0.1 Hz to 10 Hz range, the following precautions  
must be observed:  
1. The device must be warmed up for at least five minutes.  
As shown in the warm-up drift curve, the offset voltage  
typically changes 4 µV due to increasing chip temperature  
after power-up. In the 10-second measurement interval,  
these temperature-induced effects can exceed tens-of-  
nanovolts.  
OFFSET VOLTAGE ADJUSTMENT  
The input offset voltage of the OP27 is trimmed at wafer level.  
However, if further adjustment of VOS is necessary, a 10 ktrim  
potentiometer can be used. TCVOS is not degraded (see Offset  
Nulling Circuit). Other potentiometer values from 1 kto 1 MΩ  
can be used with a slight degradation (0.1 µV/°C to 0.2 µV/°C)  
of TCVOS. Trimming to a value other than zero creates a drift of  
2. For similar reasons, the device has to be well-shielded from  
air currents. Shielding minimizes thermocouple effects.  
–11–  
REV. A