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參數(shù)資料
| 型號： | OPA832DBVR |
| 英文描述： | Low-Power, Single-Supply, Fixed-Gain Video Buffer Amplifier |
| 中文描述： | 低功耗，單電源，固定增益視頻緩沖放大器 |
| 文件頁數(shù)： | 20/26頁 |
| 文件大?。?/td> | 471K |
| 代理商： | OPA832DBVR |
"#$
SBOS266B JUNE 2003 REVISED SEPTEMBER 2004
www.ti.com
20
board traces as short as possible. Never use wire-wound
type resistors in a high-frequency application. Since the
output pin is the most sensitive to parasitic capacitance,
always position the series output resistor, if any, as close
as possible to the output pin. Other network components,
such as noninverting input termination resistors, should
also be placed close to the package.
d) Connections to other wideband devices
on the board
may be made with short direct traces or through onboard
transmission lines. For short connections, consider the
trace and the input to the next device as a lumped
capacitive load. Relatively wide traces (50mils to 100mils)
should be used, preferably with ground and power planes
opened up around them. Estimate the total capacitive load
and set R
S
from the typical characteristic curve
Recommended R
S
vs Capacitive Load
. Low parasitic
capacitive loads (< 5pF) may not need an R
S
since the
OPA832 is nominally compensated to operate with a 2pF
parasitic load. Higher parasitic capacitive loads without an
R
S
are allowed as the signal gain increases (increasing the
unloaded phase margin). If a long trace is required, and the
6dB signal loss intrinsic to a doubly-terminated
transmission line is acceptable, implement a matched
impedance transmission line using microstrip or stripline
techniques (consult an ECL design handbook for
microstrip and stripline layout techniques). A 50
environment is normally not necessary onboard, and in
fact, a higher impedance environment will improve
distortion as shown in the distortion versus load plots. With
a characteristic board trace impedance defined (based on
board material and trace dimensions), a matching series
resistor into the trace from the output of the OPA832 is
used as well as a terminating shunt resistor at the input of
the destination device. Remember also that the
terminating impedance will be the parallel combination of
the shunt resistor and the input impedance of the
destination device; this total effective impedance should
be set to match the trace impedance. If the 6dB attenuation
of a doubly-terminated transmission line is unacceptable,
a long trace can be series-terminated at the source end
only. Treat the trace as a capacitive load in this case and
set the series resistor value as shown in the typical
characteristic curve
Recommended R
S
vs Capacitive
Load
. This will not preserve signal integrity as well as a
doubly-terminated line. If the input impedance of the
destination device is low, there will be some signal
attenuation due to the voltage divider formed by the series
output into the terminating impedance.
e) Socketing a high-speed part is not recommended.
The additional lead length and pin-to-pin capacitance
introduced by the socket can create an extremely
troublesome parasitic network which can make it almost
impossible to achieve a smooth, stable frequency
response. Best results are obtained by soldering the
OPA832 onto the board.
INPUT AND ESD PROTECTION
The OPA832 is built using a very high-speed complemen-
tary 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 11.
External
Pin
+V
CC
V
CC
Internal
Circuitry
Figure 11. Internal ESD Protection
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 (that is, in
systems with
±
15V supply parts driving into the OPA832),
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.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| OPA832DBVT | 制造商:BB 制造商全稱:BB 功能描述:Low-Power, Single-Supply, Fixed-Gain Video Buffer Amplifier |
| OPA832ID | 功能描述:視頻放大器 Lo-Pwr Single-Supply Fixed-Gain Video Bfr RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
| OPA832IDBVR | 功能描述:視頻放大器 Lo-Pwr Single-Supply Fixed-Gain Video Bfr RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
| OPA832IDBVRG4 | 功能描述:視頻放大器 Lo-Pwr Single-Supply Fixed-Gain Video Bfr RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
| OPA832IDBVT | 功能描述:視頻放大器 Lo-Pwr Single-Supply Fixed-Gain Video Bfr RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
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