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參數(shù)資料
| 型號： | OPA600CM |
| 元件分類： | 運算放大器 |
| 英文描述： | Fast-Settling Wideband OPERATIONAL AMPLIFIER |
| 中文描述： | 快速建立寬帶運算放大器 |
| 文件頁數(shù)： | 8/9頁 |
| 文件大?。?/td> | 103K |
| 代理商： | OPA600CM |
the potentiometer will directly connect +V
CC
to pin 2 or 15
and permanent damage will result.
Offset voltage adjustment is optional. The potentiometer and
two resistors are omitted when the offset voltage is consid-
ered sufficiently low for the particular application. For each
microvolt of offset voltage adjusted, the offset voltage tem-
perature sensitivity will change by
±
0.004
μ
V/
°
C.
CURRENT BOOST
External ability to bypass the internal current limiting resis-
tors has been provided in the OPA600. This is referred to as
current boost. Current boost enables the OPA600 to deliver
large currents into heavy loads (
±
200mA at
±
10V). To
bypass the resistors and activate the current boost, connect
pin 7 to –V
CC
at pin 6 with a short lead to minimize lead
inductance and connect pin 9 to +V
CC
at pin 12 with a short
lead.
CAUTION—Activating current boost by bypassing the in-
ternal current limiting resistors can permanently damage the
OPA600 under fault conditions. See section on short circuit
protection.
Not activating current boost is especially useful for initial
breadboarding. The 50
(
±
5%) current limiting resistor in
the collector circuit of each of the output transistors causes
the output transistors to saturate; this limits the power
dissipation in the output stage in case of a fault. Operating
with the current boost not activated may also be desirable
with small-signal outputs (i.e.,
±
1V) or when the load
current is small.
Each resistor is internally capacitively-bypassed (0.01
μ
F,
±
20%) to allow the amplifier to deliver large pulses of
current, such as to charge diode junctions or circuit capaci-
tance and still respond quickly. The length of time that the
OPA600 can deliver these current pulses is limited by the
RC time constant.
The internal voltage drops, output voltage available, power
dissipation, and maximum output current can be determined
for the user’s application by knowing the load resistance and
computing:
V
OUT
= 14 [R
LOAD
÷
(50 + R
LOAD
)]
This applies for R
less than 100
and the current boost
not activated. When R
is large, the peak output voltage
is typically
±
11V, which is determined by other factors
within the OPA600.
SHORT-CIRCUIT PROTECTION
The OPA600 is short-circuit-protected for momentary short
to common (<5s), typical of those encountered when prob-
ing a circuit during experimental breadboarding or trouble-
shooting. This is true only if pins 7 and 9 are open (current
boost not activated.) An internal 50
resistor is in series
with the collector of each of the output transistors, which
under fault conditions will cause the output transistors to
saturate and limit the power dissipation in the output stage.
Extended application of an output short can damage the
amplifier due to excessive power dissipation.
The OPA600 is not short-circuit-protected when the current
boost is activated. The large output current capability of the
OPA600 will cause excessive power dissipation and perma-
nent damage will result even for momentary shorts to ground.
Output shorts to either supply will destroy the OPA600
whether the current boost is activated or not.
HEAT SINKING AND POWER DISSIPATION
The OPA600 is intended as a printed circuit board mounted
device, and as such does not require a heat sink. It is
specified for ambient temperature operation from –55
°
C to
+125
°
C. However, the power dissipation must be kept within
safe limits. At extreme temperature and under full load
conditions, some form of heat sinking will be necessary. The
use of a heat sink, or other heat dissipating means such as
proximity to the ground plane, will result in cooler operating
temperatures, better temperature performance, and improved
reliability.
It may be necessary to physically connect the OPA600 to the
printed circuit board ground plane, attach fins, tabs, etc., to
dissipate the generated heat. Because of the wide variety of
possibilities, this task is left to the user. For all applications
it is recommended that the OPA600 be fully inserted into the
printed circuit board and that the pin length be short. Heat
will be dissipated through the ground plane and the AC
performance will be its best.
With a maximum case temperature of +125
°
C and not
exceeding the maximum junction of +175
°
C, a maximum
power dissipation of 600mW is allowed in either output
transistor.
TESTING
For static and low frequency dynamic measurements, the
OPA600 may be tested in conventional operational ampli-
fier test circuits, provided proper ground techniques are
observed, excessive lead lengths are avoided, and care is
maintained to avoid parasitic oscillations. The circuit in
Figure 3 is recommended for low frequency functional
testing, incoming inspection, etc. This circuit is less suscep-
tible to stray capacitance, excessive lead length, parasitic
tuned circuits, changing capacitive loads, etc. It does not
yield optimum settling time. We recommend placing a
resistor (approximately 300
) in series with each piece of
test equipment, such as a DVM, to isolate loading effects on
the OPA600.
To realize the full performance capabilities of the OPA600,
high frequency techniques must be employed and the test
fixture must not limit the amplifier. Settling time is the most
critical dynamic test and Figure 5 shows a recommended
OPA600 settling time test circuit schematic. Good ground-
ing, truly square drive signals, minimum stray coupling, and
small physical size are important.
The input pulse generator must have a flat topped, fast
settling pulse to measure the true settling time of the ampli-
fier. A circuit that generates a
±
5V flat topped pulse is
shown in Figure 6.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA600SM | 制造商:BB 制造商全稱:BB 功能描述:Fast-Settling Wideband OPERATIONAL AMPLIFIER |
| OPA600TM | 制造商:BB 制造商全稱:BB 功能描述:Fast-Settling Wideband OPERATIONAL AMPLIFIER |
| OPA602 | 制造商:BB 制造商全稱:BB 功能描述:High-Speed Precision Difet OPERATIONAL AMPLIFIER |
| OPA602AM | 制造商:Texas Instruments 功能描述: |
| OPA602AP | 功能描述:運算放大器 - 運放 High-Speed Precision Difet 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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