- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383693 > OPA699 Wideband, High Gain VOLTAGE LIMITING AMPLIFIER PDF資料下載
參數(shù)資料
| 型號： | OPA699 |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | Wideband, High Gain VOLTAGE LIMITING AMPLIFIER |
| 中文描述： | 寬帶，高增益電壓限幅放大器 |
| 文件頁數(shù)： | 23/25頁 |
| 文件大?。?/td> | 461K |
| 代理商： | OPA699 |
OPA699
SBOS261B
23
www.ti.com
capacitors to bypass lower frequencies. They may be some-
what further from the device, and be shared among several
adjacent devices.
c)
Place external components close
to the OPA699. This
minimizes inductance, ground loops, transmission line ef-
fects and propagation delay problems. Be extra careful with
the feedback (R
F
), input and output resistors.
d)
Use high-frequency components
to minimize parasitic
elements. Resistors should be a very low reactance type.
Surface-mount resistors work best and allow a tighter layout.
Metal film or carbon composition axially-leaded resistors can
also provide good performance when their leads are as short
as possible. Never use wirewound resistors for high-fre-
quency applications. Remember that most potentiometers
have large parasitic capacitances and inductances. Multi-
layer ceramic chip capacitors work best and take up little
space. Monolithic ceramic capacitors also work very well.
Use R
F
type capacitors with low ESR and ESL. The large
power pin bypass capacitors (2.2
μ
F to 6.8
μ
F) should be
tantalum for better high frequency and pulse performance.
e)
Choose low resistor values
to minimize the time con-
stant set by the resistor and its parasitic parallel capacitance.
Good metal film or surface mount resistors have approxi-
mately 0.2pF parasitic parallel capacitance. For resistors
> 1.5k
, this adds a pole and/or zero below 500MHz. Make
sure that the output loading is not too heavy. The recom-
mended 750
feedback resistor is a good starting point in
most designs.
f)
Use short direct traces to other wideband devices
on
the board. Short traces act as a lumped capacitive load.
Wide traces (50 to 100 mils) should be used. Estimate the
total capacitive load at the output, and use the series isola-
tion resistor recommended in the typical performance curve,
Recommended R
S
vs Capacitive Load Parasitic loads < 2pF
may not need the isolation resistor.
g)
When long traces are necessary,
use transmission line
design techniques (consult an ECL design handbook for
microstrip and stripline layout techniques). A 50
transmis-
sion line is not required on board
—
a higher characteristic
impedance will help reduce output loading. Use a matching
series resistor at the output of the op amp to drive a
transmission line, and a matched load resistor at the other
end to make the line appear as a resistor. If the 6dB of
attenuation that the matched load produces is not accept-
able, and the line is not too long, use the series resistor at the
source only. This will isolate the source from the reactive load
presented by the line, but the frequency response will be
degraded. Multiple destination devices are best handled as
separate transmission lines, each with its own series source
and shunt load terminations. Any parasitic impedances act-
ing on the terminating resistors will alter the transmission line
match, and can cause unwanted signal reflections and reac-
tive loading.
h)
Do not use sockets
for high-speed parts like the OPA699.
The additional lead length and pin-to-pin capacitance intro-
duced by the socket creates an extremely troublesome
parasitic network. Best results are obtained by soldering the
part onto the board.
POWER SUPPLIES
The OPA699 is nominally specified for operation using either
±
5V supplies or a single +5V supply. The maximum specified
total supply voltage of 13V allows reasonable tolerances on
the supplies. Higher supply voltages can break down internal
junctions, possibly leading to catastrophic failure. Single-
supply operation is possible as long as common mode
voltage constraints are observed. The common-mode input
and output voltage specifications can be interpreted as a
required headroom to the supply voltage. Observing this
input and output headroom requirement will allow design of
non-standard or single-supply operation circuits. Figure 2
shows one approach to single-supply operation.
INPUT AND ESD PROTECTION
The OPA699 is built using a very high-speed complementary
bipolar process. The internal junction breakdown voltages
are relatively low for these very small geometry devices.
These breakdowns are reflected in the Absolute Maximum
Ratings table. All device pins are protected with internal ESD
protection diodes to the power supplies, as shown in Figure
18.
These diodes provide moderate protection to input overdrive
voltages above the supplies as well. The protection diodes
can typically support 30mA continuous current. Where higher
currents are possible (e.g., in systems with
±
15V supply parts
driving into the OPA699), current limiting series resistors
should be added into the two inputs. Keep these resistor
values as low as possible, since high values degrade both
noise performance and frequency response.
External
Pin
+V
CC
–
V
CC
Internal
Circuitry
FIGURE 18. I/O Pin ESD Protection.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| OPA699IDR | Wideband, High Gain VOLTAGE LIMITING AMPLIFIER |
| OPA708 | REFLECTIVE OBJECT SENSORS |
| OPA729 | 10 Watt Light Bar on Anotherm Linear Heat Spreader |
| OPA729B | 10 Watt Light Bar on Anotherm Linear Heat Spreader |
| OPA729BD | 10 Watt Light Bar on Anotherm Linear Heat Spreader |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA699ID | 功能描述:高速運(yùn)算放大器 Wideband High Gain Vltg Limiting 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 |
| OPA699ID | 制造商:Texas Instruments 功能描述:IC, LIMITING AMPLIFIER, 260MHZ, SOIC-8 |
| OPA699IDG4 | 功能描述:高速運(yùn)算放大器 Wideband High Gain Vltg Limiting 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 |
| OPA699IDR | 功能描述:高速運(yùn)算放大器 Wideband High Gain Vltg Limiting 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 |
| OPA699IDRG4 | 功能描述:高速運(yùn)算放大器 Wideband High Gain Vltg Limiting 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。