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PDF LMH6505 Data sheet ( Hoja de datos )
| Número de pieza | LMH6505 | |
| Descripción | Variable Gain Amplifier | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LMH6505 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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www.DataSheet4U.com
January 2006
LMH6505
Wideband, Low Power, Linear-in-dB, Variable Gain
Amplifier
General Description
The LMH6505 is a wideband DC coupled voltage controlled
gain stage followed by a high-speed current feedback op
amp which can directly drive a low impedance load. The gain
adjustment range is 80 dB for up to 10 MHz which is accom-
plished by varying the gain control input voltage, VG.
Maximum gain is set by external components, and the gain
can be reduced all the way to cut-off. Power consumption is
110 mW with a speed of 150 MHz and a gain control band-
width (BW) of 100 MHz. Output referred DC offset voltage is
less than 55 mV over the entire gain control voltage range.
Device-to-device gain matching is within ±0.5 dB at maxi-
mum gain. Furthermore, gain is tested and guaranteed over
a wide range. The output current feedback op amp allows
high frequency large signals (Slew Rate = 1500 V/µs) and
can also drive a heavy load current (60 mA) guaranteed.
Near ideal input characteristics (i.e. low input bias current,
low offset, low pin 3 resistance) enable the device to be
easily configured as an inverting amplifier as well.
To provide ease of use when working with a single supply,
the VG range is set to be from 0V to +2V relative to the
ground pin potential (pin 4). VG input impedance is high in
order to ease drive requirement. In single supply operation,
the ground pin is tied to a "virtual" half supply.
The LMH6505’s gain control is linear in dB for a large portion
of the total gain control range from 0 dB down to −85 dB @
25˚C, as shown below. This makes the device suitable for
AGC applications. For linear gain control applications, see
the LMH6503 datasheet.
The LMH6505 is available in either the SOIC-8 or the
MSOP-8 package. The combination of minimal external
components and small outline packages allows the
LMH6505 to be used in space-constrained applications.
Features
VS = ±5V, TA = 25˚C, RF = 1 kΩ, RG = 100Ω, RL = 100Ω, AV
= AVMAX = 9.4 V/V, Typical values unless specified.
n −3 dB BW
150 MHz
n Gain control BW
100 MHz
n Adjustment range (<10 MHz)
80 dB
n Gain matching (limit)
±0.50 dB
n Supply voltage range
7V to 12V
n Slew rate (inverting)
1500 V/µs
n Supply current (no load)
11 mA
n Linear output current
±60 mA
n Output voltage swing
±2.4V
n Input noise voltage
4.4 nV/
n Input noise current
2.6 pA/
n THD (20 MHz, RL = 100Ω, VO = 2 VPP)
−45 dBc
Applications
n Variable attenuator
n AGC
n Voltage controlled filter
n Video imaging processing
Typical Application
Gain vs. VG
20171011
© 2006 National Semiconductor Corporation DS201710
AVMAX = 9.4 V/V
20171002
www.national.com
1 page  
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Typical Performance Characteristics Unless otherwise specified: VS = ±5V, TA = 25˚C,
VG = VGMAX, RF = 1 kΩ, RG = 100Ω, VIN = 0.1V, input terminated in 50Ω. RL = 100Ω, Typical values.
Frequency Response Over Temperature
Frequency Response for Various VG
20171003
Frequency Response (AVMAX = 2)
Inverting Frequency Response
20171004
20171046
Frequency Response for Various VG (AVMAX = 100)
(Large Signal)
20171044
Frequency Response for Various Amplitudes
20171045
5
20171064
www.national.com
5 Page 
www.DataSheet4U.com
Typical Performance Characteristics Unless otherwise specified: VS = ±5V, TA = 25˚C,
VG = VGMAX, RF = 1 kΩ, RG = 100Ω, VIN = 0.1V, input terminated in 50Ω. RL = 100Ω, Typical values. (Continued)
Step Response Plot
Gain vs. VG Step
20171017
20171032
11 www.national.com
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| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LMH6505.PDF ] | |
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