參數(shù)資料
型號(hào)： LMH6503MA
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 模擬信號(hào)調(diào)理
英文描述： Wideband, Low Power, Linear Variable Gain Amplifier
中文描述： SPECIALTY ANALOG CIRCUIT, PDSO14
封裝： SOIC-14
文件頁(yè)數(shù)： 14/20頁(yè)
文件大?。?/td> 1009K
代理商： LMH6503MA
Typical Performance Charateristics
Unless otherwise specified: V
S
=
±
5V, 25C, V
G
= V
G_MAX
, V
CM
= 0V, R
= 1k
, R
G
= 174
, both inputs terminated in 50
, R
L
= 100
, Typical values, results referred to device
output: (Continued)
V
G
Feedthrough
20073982
Application Information
THEORY OF OPERATION
The LMH6503 is a linear wideband variable-gain amplifier as
illustrated in
Figure 1
. A voltage input signal may be applied
differentially between the two inputs (+V
IN
, V
IN
), or single-
endedly by grounding one of the two unused inputs. The
LMH6503 input buffers convert the input voltage to a current
(I
RG
) that is a function of the differential input voltage (V
INPUT
= (+V
IN
) - (V
IN
)) and the value of the gain setting resistor
(R
G
). This current (I
RG
) is then mirrored to a gain stage with
a current gain of K (1.72 nominal). The voltage controlled
two-quadrant multiplier attenuates this current which is then
converted to a voltage via the output amplifier. This output
amplifier is a current feedback op amp configured as a
Transimpedance amplifier. Its Transimpedance gain is the
feedback resistor (R
). The input signal, output, and gain
control are all voltages. The output voltage can easily be
calculated as shown in Equation 1:
(1)
Where K = 1.72 (Nominal)
since:
The gain of the LMH6503 is therefore a function of three
external variables: R
G
, R
F
, and V
G
as expressed in Equation
2:
(2)
The gain control voltage (V
) has an ideal input range of 1V
<
V
<
+1V. At V
= +1V, the gain of the LMH6503 is at its
maximum as expressed in Equation 3:
(3)
Notice also that Equation 3 holds for both differential and
single ended operation.
CHOOSING R
F
AND R
G
R
is calculated from Equation 4. V
INPUTMAX
is the maxi-
mum peak
(4)
input voltage (V
) determined by the application. I
is
the maximum allowable current through R
and is typically
2.3mA. Once A
is determined from the minimum input
and desired output voltages, R
F
is then determined using
Equation 5. These values of R
F
and R
G
are
20073951
FIGURE 1. LMH6503 Functional Block Diagram
L
www.national.com
14
相關(guān)PDF資料
PDF描述
LMH6503MAX Wideband, Low Power, Linear Variable Gain Amplifier
LMH6503MT Wideband, Low Power, Linear Variable Gain Amplifier
LMH6503MTX Wideband, Low Power, Linear Variable Gain Amplifier
LMH6503 Wideband, Low Power, Linear Variable Gain Amplifier
LMH6504 Wideband, Low Power, Variable Gain Amplifier
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LMH6503MA/NOPB 功能描述:特殊用途放大器 WDBD, LO PWR, LINEAR -IN-DB VAR GAIN AMP RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel
LMH6503MAX 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel
LMH6503MAX/NOPB 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel
LMH6503MT 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel
LMH6503MT/NOPB 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel
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