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


Product details


PGA/VGA VGA Number of channels (#) 1 BW @ Acl (MHz) 150 Vs (Max) (V) 12 Vs (Min) (V) 7 Acl, min spec gain (V/V) 1 Gain (Max) (dB) 40 Slew rate (Typ) (V/us) 1500 Operating temperature range (C) -40 to 85 open-in-new Find other Programmable & variable gain amplifiers (PGA/VGA)

Package | Pins | Size

SOIC (D) 8 19 mm² 4.9 x 3.9 VSSOP (DGK) 8 15 mm² 3 x 4.9 open-in-new Find other Programmable & variable gain amplifiers (PGA/VGA)


  • 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

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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 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 space-constrained applications.

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Technical documentation

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Type Title Date
* Datasheet LMH6505 Wideband, Low Power, Linear-in-dB, Variable Gain Amplifier datasheet (Rev. E) Apr. 04, 2013
E-book The Signal e-book: A compendium of blog posts on op amp design topics Mar. 28, 2017

Design & development

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Hardware development


Texas Instruments offers this unpopulated Evaluation Board to aid in the evaluation and testing of high-speed Variable Gain Amplifier that are offered in the 8-Pin SOIC package. Resistors, capacitors, or any other surface-mount components can be easily mounted on this board in the desired circuit (...)

  • Accommodates various high-speed Variable Gain Amplifier
  • Allows quick and easy evaluation
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  • Utilizes surface-mount components


Design tools & simulation

SNOM152.ZIP (4 KB) - PSpice Model
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CAD/CAE symbols

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SOIC (D) 8 View options
VSSOP (DGK) 8 View options

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