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.