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參數資料
| 型號： | LMH6550MAX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運算放大器 |
| 英文描述： | Differential, High Speed Op Amp |
| 中文描述： | OP-AMP, 4000 uV OFFSET-MAX, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數： | 11/17頁 |
| 文件大小： | 854K |
| 代理商： | LMH6550MAX |
Application Section
The LMH6550 is a fully differential amplifier designed to
provide low distortion amplification to wide bandwidth differ-
ential signals. The LMH6550, though fully integrated for
ultimate balance and distortion performance, functionally
provides three channels. Two of these channels are the V
+
and V
signal path channels, which function similarly to
inverting mode operational amplifiers and are the primary
signal paths. The third channel is the common mode feed-
back circuit. This is the circuit that sets the output common
mode as well as driving the V
+
and V
outputs to be equal
magnitude and opposite phase, even when only one of the
two input channels is driven. The common mode feedback
circuit allows single ended to differential operation.
The LMH6550 is a voltage feedback amplifier with gain set
by external resistors. Output common mode voltage is set by
the V
pin. This pin should be driven by a low impedance
reference and should be bypassed to ground with a 0.1 μF
ceramic capacitor. Any signal coupling into the V
will be
passed along to the output and will reduce the dynamic
range of the amplifier.
The LMH6550 is equipped with a ENABLE pin to reduce
power consumption when not in use. The ENABLE pin floats
to logic high. If this pin is not used it can be left floating. The
amplifier output stage goes into a high impedance state
when the amplifier is disabled. The feedback and gain set
resistors will then set the impedance of the circuit. For this
reason input to output isolation will be poor in the disabled
state.
FULLY DIFFERENTIAL OPERATION
The LMH6550 will perform best when used with split sup-
plies and in a fully differential configuration. See
Figure 1
and
Figure 3
for recommend circuits.
The circuit shown in
Figure 1
is a typical fully differential
application as might be used to drive an ADC. In this circuit
closed loop gain, (A
) = V
/ V
IN
= R
/R
. For all the
applications in this data sheet V
is presumed to be the
voltage presented to the circuit by the signal source. For
differential signals this will be the difference of the signals on
each input (which will be double the magnitude of each
individual signal), while in single ended inputs it will just be
the driven input signal.
The resistors R
help keep the amplifier stable when pre-
sented with a load C
as is typical in an analog to digital
converter (ADC). When fed with a differential signal, the
LMH6550 provides excellent distortion, balance and com-
mon mode rejection provided the resistors R
F
, R
G
and R
O
are well matched and strict symmetry is observed in board
layout. With a DC CMRR of over 80dB, the DC and low
frequency CMRR of most circuits will be dominated by the
external resistors and board trace resistance. At higher fre-
quencies board layout symmetry becomes a factor as well.
Precision resistors of at least 0.1% accuracy are recom-
mended and careful board layout will also be required.
With up to 15 V
PP
differential output voltage swing and 80
mA of linear drive current the LMH6550 makes an excellent
cable driver as shown in
Figure 2
. The LMH6550 is also
suitable for driving differential cables from a single ended
source.
20130104
FIGURE 1. Typical Application
20130102
FIGURE 2. Fully Differential Cable Driver
20130110
FIGURE 3. Single Ended in Differential Out
L
www.national.com
11
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| LMH6559 | High-Speed, Closed-Loop Buffer |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LMH6550MAX/NOPB | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數量: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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMH6550MM | 制造商:Texas Instruments 功能描述:OP Amp Single Volt Fdbk ±6V/12V 8-Pin MSOP T/R 制造商:Texas Instruments 功能描述:OP AMP, DIFF SINGL, SOIC8, POWERWISE 制造商:Texas Instruments 功能描述:Differential High Speed Op Amp,LMH6550MM |
| LMH6550MM/NOPB | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數量: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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMH6550MMX | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數量: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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMH6550MMX/NOPB | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數量: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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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