參數(shù)資料
型號(hào)： THS3096PWPR
廠商： Texas Instruments, Inc.
英文描述： HIGH-VOLTAGE, LOW-DISTORTION, CURRENT-FEEDBACK OPERATIONAL AMPLIFIERS
中文描述： 高壓，低失真，電流反饋運(yùn)算放大器
文件頁(yè)數(shù)： 21/34頁(yè)
文件大?。?/td> 1605K
代理商： THS3096PWPR
www.ti.com
PRINTED-CIRCUIT BOARD LAYOUT
TECHNIQUES FOR OPTIMAL
PERFORMANCE
Achieving optimum performance with high frequency
amplifier,
like
the
THS3092/6,
attention to board layout parasitic and external
component types.
0
500
1000
1500
2000
2500
100 k
1 M
f Frequency Hz
10 M
100 M
1 G
+
1.21 k
1.21 k
50
V
O
ZO
V
S
=
±
15 V and
±
5 V
POWER-DOWN REFERENCE PIN
OPERATION
In addition to the power-down pin, the THS3096 and
THS3096 feature a reference pin (REF) which allows
the user to control the enable or disable power-down
voltage levels applied to the PD pin. In most
split-supply applications, the reference pin is connec-
ted to ground. In either case, the user needs to be
aware of voltage-level thresholds that apply to the
power-down pin. The usable range at the REF pin is
from V
S-
to (V
S+
- 4 V).
THS3092
THS3096
SLOS428A–DECEMBER 2003–REVISED FEBRUARY 2004
requires
careful
Recommendations that optimize performance include:
Minimize parasitic capacitance to any ac ground
for all of the signal I/O pins. Parasitic capacitance
on the output and input pins can cause instability.
To reduce unwanted capacitance, a window
around the signal I/O pins should be opened in all
of the ground and power planes around those
pins. Otherwise, ground and power planes should
be unbroken elsewhere on the board.
Minimize the distance (< 0.25”) from the power
supply pins to high frequency 0.1-μF and 100-pF
decoupling capacitors. At the device pins, the
ground and power plane layout should not be in
close proximity to the signal I/O pins. Avoid
narrow power and ground traces to minimize
inductance between the pins and the decoupling
capacitors. The power supply connections should
always be decoupled with these capacitors.
Larger (6.8 μF or more) tantalum decoupling
capacitors, effective at lower frequency, should
also be used on the main supply pins. These may
be placed somewhat farther from the device and
may be shared among several devices in the
same area of the PC board.
Careful selection and placement of external
components preserve the high frequency per-
formance of the THS3092/6. Resistors should be
a very low reactance type. Surface-mount re-
sistors work best and allow a tighter overall
layout. Again, keep their leads and PC board
trace length as short as possible. Never use
wirebound type resistors in a high frequency
application. Since the output pin and inverting
input pins are the most sensitive to parasitic
capacitance, always position the feedback and
series output resistors, if any, as close as poss-
ible to the inverting input pins and output pins.
Other network components, such as input termin-
ation resistors, should be placed close to the
gain-setting resistors. Even with a low parasitic
capacitance
shunting
excessively high resistor values can create sig-
nificant time constants that can degrade perform-
ance. Good axial metal-film or surface-mount
resistors have approximately 0.2 pF in shunt with
the resistor. For resistor values > 2.0 k
, this
parasitic capacitance can add a pole and/or a
zero that can effect circuit operation. Keep
resistor values as low as possible, consistent with
load driving considerations.
Figure 65. Power-down Output Impedance vs
Frequency
As with most current feedback amplifiers, the internal
architecture places some limitations on the system
when in power-down mode. Most notably is the fact
that the amplifier actually turns
ON
if there is a
±
0.7 V
or greater difference between the two input nodes
(V+ and V-) of the amplifier. If this difference exceeds
±
0.7 V, the output of the amplifier creates an output
voltage
equal
[(V+ - V-) -0.7 V]
×
Gain. This also implies that if a
voltage is applied to the output while in power-down
mode,
the
V-
node
V
O(applied)
×
R
G
/(R
F
+ R
G
). For low gain configurations
and a large applied voltage at the output, the ampli-
fier may actually turn
ON
due to the aforementioned
behavior.
to
approximately
voltage
is
equal
to
The time delays associated with turning the device on
and off are specified as the time it takes for the
amplifier to reach either 10% or 90% of the final
output voltage. The time delays are in the order of
microseconds because the amplifier moves in and out
of the linear mode of operation in these transitions.
the
external
resistors,
21
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THS3096PWPRG4 功能描述:高速運(yùn)算放大器 Dual Hig-Vltg Low Distortion RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
THS3110 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOW-NOISE, HIGH-VOLTAGE, CURRENT-FEEDBACK, OPERATIONAL AMPLIFIERS
THS3110CD 功能描述:高速運(yùn)算放大器 Sngl Lo-Noise Hi-Vlt Current-Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
THS3110CDG4 功能描述:高速運(yùn)算放大器 Sngl Lo-Noise Hi-Vlt Current-Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
THS3110CDGN 功能描述:高速運(yùn)算放大器 Sngl Lo-Noise Hi-Vlt Current-Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
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