1FEATURES
2• VS = ±5V, TA = 25°C, RF = 1 kΩ, RG = 100Ω, RL =
100Ω, AV = AVMAX = 9.4 V/V, Typical Values
Unless Specified.
• −3 dB BW 150 MHz
• Gain Control BW 100 MHz
• Adjustment Range (<10 MHz) 80 dB
• Gain Matching (Limit) ±0.50 dB
• Supply Voltage Range 7V to 12V
• Slew Rate (Inverting) 1500 V/μs
• Supply Current (No Load) 11 mA
• Linear Output Current ±60 mA
• Output Voltage Swing ±2.4V
• Input Noise Voltage 4.4 nV/√Hz
• Input Noise Current 2.6 pA/√Hz
• THD (20 MHz, RL = 100Ω, VO = 2 VPP) −45 dBc

APPLICATIONS
• Variable Attenuator
• AGC
• Voltage Controlled Filter
• Video Imaging Processing

DESCRIPTION
The LMH6505 is a wideband DC coupled voltage
controlled gain stage followed by a high speed
current feedback operational amplifier which can
directly drive a low impedance load. The gain
adjustment range is 80 dB for up to 10 MHz which is
accomplished by varying the gain control input
voltage, V G.
Maximum gain is set by external components, and
the gain can be reduced all the way to cutoff. Power
consumption is 110 mW with a speed of 150 MHz
and a gain control bandwidth (BW) of 100 MHz.
Output referred DC offset voltage is less than 55 mV
over the entire gain control voltage range. Device-todevice
gain matching is within ±0.5 dB at maximum
gain. Furthermore, gain is tested and ensured 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) ensured.
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 at 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 8-Pin SOIC or
the 8-Pin VSSOP package. The combination of minimal external components and small outline
packages allows the LMH6505 to be used in spaceconstrained
applications.