參數(shù)資料
型號(hào)： OP27AP
廠商： Texas Instruments, Inc.
英文描述： LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
中文描述： 低噪聲，高精密高速運(yùn)算放大器
文件頁(yè)數(shù)： 19/21頁(yè)
文件大小： 322K
代理商： OP27AP
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
2–19
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
APPLICATION INFORMATION
offset voltage and drift (continued)
The circuit shown in Figure 38 measures offset voltage. This circuit can also be used as the burn-in configuration
for the OP27 and OP37 with the supply voltage increased to 20 V, R1 = R3 = 10 k
, R2 = 200
, and
A
VD
= 100.
15 V
+
–
–15 V
R1
50 k
R2
100
R3
50 k
VO = 1000 VIO
2
3
6
7
4
NOTE A: Resistors must have low thermoelectric potential.
Figure 38. Test Circuit for Offset Voltage and Offset Voltage
Temperature Coefficient
unity gain buffer applications
The resulting output waveform, when R
f
≤
100
and the input is driven with a fast large-signal pulse (> 1 V),
is shown in the pulsed-operation diagram in Figure 39.
+
–
Rf
Output
2.8 V/
μ
s
OP27
Figure 39. Pulsed Operation
During the initial (fast-feedthrough-like) portion of the output waveform, the input protection diodes effectively
short the output to the input, and a current, limited only by the output short-circuit protection, is drawn by the
signal generator. When R
f
≥
500
, the output is capable of handling the current requirements (load
current
≤
20 mA at 10 V), the amplifier stays in its active mode, and a smooth transition occurs. When
R
f
> 2 k
, a pole is created with R
f
and the amplifier’s input capacitance, creating additional phase shift and
reducing the phase margin. A small capacitor (20 pF to 50 pF) in parallel with R
f
eliminates this problem.
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