參數(shù)資料
型號(hào)： OPA640U
英文描述： Wideband Voltage Feedback OPERATIONAL AMPLIFIER
中文描述： 寬帶電壓反饋運(yùn)算放大器
文件頁(yè)數(shù)： 9/13頁(yè)
文件大小： 190K
代理商： OPA640U
OPA640
9
This eliminates the need for the user to add external protec-
tion diodes, which can add capacitance and degrade AC
performance.
All pins on the OPA640 are internally protected from ESD
ESD Protection diodes internally
connected to all pins.
FIGURE 2. Internal ESD Protection.
External
Pin
+V
CC
–V
CC
Internal
Circuitry
by means of a pair of back-to-back reverse-biased diodes to
either power supply as shown. These diodes will begin to
conduct when the input voltage exceeds either power supply
by about 0.7V. This situation can occur with loss of the
amplifier’s power supplies while a signal source is still
present. The diodes can typically withstand a continuous
current of 30mA without destruction. To insure long term
reliability, however, diode current should be externally lim-
ited to 10mA or so whenever possible.
The OPA640 utilizes a fine geometry high speed process
that withstands 500V using Human Body Model and 100V
using the Machine Model. However, static damage can
cause subtle changes in amplifier input characteristics with-
out necessarily destroying the device. In precision opera-
tional amplifiers, this may cause a noticeable degradation of
offset voltage and drift. Therefore, static protection is strongly
recommended when handling the OPA640.
OUTPUT DRIVE CAPABILITY
The OPA640 has been optimized to drive 75
and 100
resistive loads. The device can drive 2Vp-p into a 75
load.
This high-output drive capability makes the OPA640 an
ideal choice for a wide range of RF, IF, and video applica-
tions. In many cases, additional buffer amplifiers are un-
needed.
Many demanding high-speed applications such as
ADC/DAC buffers require op amps with low wideband
output impedance. For example, low output impedance is
essential when driving the signal-dependent capacitances at
the inputs of flash A/D converters. As shown in Figure 3,
the OPA640 maintains very low closed-loop output imped-
ance over frequency. Closed-loop output impedance in-
creases with frequency since loop gain is decreasing with
frequency.
FIGURE 3. Closed-Loop Output Impedance vs Frequency.
THERMAL CONSIDERATIONS
The OPA640 does not require a heat sink for operation in
most environments. At extreme temperatures and under full
load conditions a heat sink may be necessary.
The internal power dissipation is given by the equation
P
= P
DQ
+ P
, where P
is the quiescent power dissipation
and P
is the power dissipation in the output stage due to the
load. (For
±
V
=
±
5V, P
= 10V
x
22mA = 220mW, max).
For the case where the amplifier is driving a grounded load
(R
) with a DC voltage (
±
V
OUT
) the maximum value of P
DL
occurs at
±
V
=
±
V
/2, and is equal to P
,
max = (
±
V
)
2
/4R
. Note that it is the voltage across the
output transistor, and not the load, that determines the power
dissipated in the output stage.
A short-circuit condition represents the maximum amount of
internal power dissipation that can be generated. The varia-
tion of output current with temperature is shown in Figure 4.
CAPACITIVE LOADS
FIGURE 4. Output Current vs. Temperature.
70
60
50
40
–60
Ambient Temperature (°C)
O
–40
–20
0
20
40
60
80
100
120
140
–I
O
+I
O
100
10
1
0.1
0.01
0.001
10k
Frequency (Hz)
O
)
100k
1M
10M
100M
A
V
= +1V/V
相關(guān)PDF資料
PDF描述
OPA640UB Wideband Voltage Feedback OPERATIONAL AMPLIFIER
OPA642 Wideband, Low Distortion, Low Gain OPERATIONAL AMPLIFIER
OPA642N Wideband, Low Distortion, Low Gain OPERATIONAL AMPLIFIER
OPA642P Wideband, Low Distortion, Low Gain OPERATIONAL AMPLIFIER
OPA642PB Wideband, Low Distortion, Low Gain OPERATIONAL AMPLIFIER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
OPA640UB 制造商:Rochester Electronics LLC 功能描述:- Bulk
OPA641 制造商:BB 制造商全稱(chēng):BB 功能描述:Wideband Voltage Feedback OPERATIONAL AMPLIFIER
OPA641H 制造商:BB 制造商全稱(chēng):BB 功能描述:Wideband Voltage Feedback OPERATIONAL AMPLIFIER
OPA641HSQ 制造商:BB 制造商全稱(chēng):BB 功能描述:Wideband Voltage Feedback OPERATIONAL AMPLIFIER
OPA641P 制造商:BB 制造商全稱(chēng):BB 功能描述:Wideband Voltage Feedback OPERATIONAL AMPLIFIER
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