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| 型号： | OP279GSZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 15/16页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP R-R 5MHZ DUAL 8SOIC |
| 标准包装： | 2,500 |
| 放大器类型： | 通用 |
| 电路数： | 2 |
| 输出类型： | 满摆幅 |
| 转换速率： | 3 V/µs |
| 增益带宽积： | 5MHz |
| 电流 - 输入偏压： | 300nA |
| 电压 - 输入偏移： | 4000µV |
| 电流 - 电源： | 3.75mA |
| 电流 - 输出 / 通道： | 50mA |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 12 V，±2.25 V ~ 6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
OP179/OP279
–8–
REV. G
7
2
0
0.01
0.100
10
1
5
1
3
4
6
CAPACITIVE LOAD – nF
BANDWIDTH
–
MHz
VS
5V
RL
1k
TA
25 C
Figure 4. OP179/OP279 Bandwidth vs. Capacitive Load
1/2
OP279
RS
20V
CS
1 F
CL
10nF
5V
VIN
100mV p-p
VOUT
Figure 5. Snubber Network Compensates for Capacitive
Load
The first step is to determine the value of the resistor, RS. A
good starting value is 100
(typically, the optimum value will
be less than 100
). This value is reduced until the small-signal
transient response is optimized. Next, CS is determined—10
F
is a good starting point. This value is reduced to the smallest
value for acceptable performance (typically, 1
F). For the case
of a 10 nF load capacitor on the OP179/OP279, the optimal
snubber network is a 20
in series with 1 F. The benefit is
immediately apparent as seen in the scope photo in Figure 6.
The top trace was taken with a 10 nF load and the bottom trace
with the 20
, 1 F snubber network in place. The amount of
overshot and ringing is dramatically reduced. Table I illustrates a
few sample snubber networks for large load capacitors.
90
100
10nF LOAD
ONLY
SNUBBER
IN CIRCUIT 10
0%
50mV
2 s
Figure 6. Overshoot and Ringing Are Reduced by Adding
a “Snubber” Network in Parallel with the 10 nF Load
Table I. Snubber Networks for Large Capacitive Loads
Load Capacitance (CL)
Snubber Network (RS, CS)
10 nF
20
, 1 F
100 nF
5
, 10 F
1
F0 , 10 F
Overload Recovery Time
Overload, or overdrive, recovery time of an operational amplifier
is the time required for the output voltage to recover to its linear
region from a saturated condition. This recovery time is impor-
tant in applications where the amplifier must recover after a
large transient event. The circuit in Figure 7 was used to
evaluate the OP179/OP279’s overload recovery time. The
OP179/OP279 takes approximately 1
s to recover from positive
saturation and approximately 1.2
s to recover from negative
saturation.
1/2
OP279
RL
499
+5V
VOUT
–5V
R3
10k
R2
1k
R1
909
2V p-p
@ 100Hz
Figure 7. Overload Recovery Time Test Circuit
Output Transient Current Recovery
In many applications, operational amplifiers are used to provide
moderate levels of output current to drive the inputs of ADCs,
small motors, transmission lines and current sources. It is in these
applications that operational amplifiers must recover quickly to
step changes in the load current while maintaining steady-state
load current levels. Because of its high output current capability
and low closed-loop output impedance, the OP179/OP279 is an
excellent choice for these types of applications. For example,
when sourcing or sinking a 25 mA steady-state load current, the
OP179/OP279 exhibits a recovery time of less than 500 ns to
0.1% for a 10 mA (i.e., 25 mA to 35 mA and 35 mA to 25 mA)
step change in load current.
A Precision Negative Voltage Reference
In many data acquisition applications, the need for a precision
negative reference is required. In general, any positive voltage
reference can be converted into a negative voltage reference
through the use of an operational amplifier and a pair of matched
resistors in an inverting configuration. The disadvantage to that
approach is that the largest single source of error in the circuit is
the relative matching of the resistors used.
The circuit illustrated in Figure 8 avoids the need for tightly
matched resistors with the use of an active integrator circuit. In
this circuit, the output of the voltage reference provides the
input drive for the integrator. The integrator, to maintain circuit
equilibrium, adjusts its output to establish the proper relation-
ship between the reference’s VOUT and GND. Thus, various
negative output voltages can be chosen simply by substituting
for the appropriate reference IC (see table). To speed up the
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