LMH6505| Datasheet

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LMH6505 Wideband, Low Power, Linear-in-dB, Variable Gain Amplifier

December 14, 2007

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 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, VG. 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-to-device gain matching is within 0.5 dB at maximum 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/s) 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 inverti
ng 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 8Pin MSOP 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 k, RG = 100, RL = 100, AV = AVMAX = 9.4 V/V, Typical values unless specified. 150 MHz -3 dB BW 100 MHz Gain control BW 80 dB Adjustment range (<10 MHz) 0.50 dB Gain matching (limit) 7V to 12V Supply voltage range 1500 V/s Slew rate (inverting) 11 mA Supply current (no load) 60 mA Linear output current 2.4V Output voltage swing 4.4 nV/Hz Input noise voltage 2.6 pA/Hz Input noise current -45 dBc THD (20 MHz, RL = 100, VO = 2 VPP)

Applications

Variable attenuator AGC Voltage controlled filter Video imaging processing

Typical Application

20171002 20171011

AVMAX = 9.4 V/V

Gain vs. VG

2007 National Semiconductor Corporation

201710

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