Wideband, Low Power, Linear Variable Gain Amplifier


Product details


PGA/VGA VGA Number of channels (#) 1 BW @ Acl (MHz) 135 Vs (Max) (V) 12 Vs (Min) (V) 5 Acl, min spec gain (V/V) 1 Gain (Max) (dB) 40 Slew rate (Typ) (V/us) 1800 Operating temperature range (C) -40 to 85 open-in-new Find other Programmable & variable gain amplifiers (PGA/VGA)

Package | Pins | Size

SOIC (D) 14 52 mm² 8.65 x 6 TSSOP (PW) 14 32 mm² 5 x 6.4 open-in-new Find other Programmable & variable gain amplifiers (PGA/VGA)


  • VS = ±5V, TA = 25°C, RF = 1kΩ, RG = 174Ω, RL = 100Ω, AV = AV(MAX) = 10, Typical Values Unless Specified.
  • -3dB BW 135MHz
  • Gain Control BW 100MHz
  • Adjustment Range (Typical Over Temp) 70dB
  • Gain Matching (Limit) ±0.7dB
  • Slew Rate 1800V/µs
  • Supply Current (No Load) 37mA
  • Linear Output Current ±75mA
  • Output Voltage (RL = 100Ω) ±3.2V
  • Input Voltage Noise 6.6nV/√Hz
  • Input Current Noise 2.4pA/√Hz
  • THD (20MHz, RL = 100Ω, VO = 2VPP) −57dBc
  • Replacement for CLC522

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The LMH6503 is a wideband, DC coupled, differential input, voltage controlled gain stage followed by a high-speed current feedback Op Amp which can directly drive a low impedance load. Gain adjustment range is more than 70dB for up to 10MHz.

Maximum gain is set by external components and the gain can be reduced all the way to cut-off. Power consumption is 370mW with a speed of 135MHz . Output referred DC offset voltage is less than 350mV over the entire gain control voltage range. Device-to-device Gain matching is within 0.7dB at maximum gain. Furthermore, gain at any VG is tested and the tolerance is ensured. The output current feedback Op Amp allows high frequency large signals (Slew Rate = 1800V/μs) and can also drive heavy load current (75mA). Differential inputs allow common mode rejection in low level amplification or in applications where signals are carried over relatively long wires. For single ended operation, the unused input can easily be tied to ground (or to a virtual half-supply in single supply application). Inverting or non-inverting gains could be obtained by choosing one input polarity or the other.

To further increase versatility when used in a single supply application, gain control range is set to be from −1V to +1V relative to pin 11 potential (ground pin). In single supply operation, this ground pin is tied to a "virtual" half supply. Gain control pin has high input impedance to simplify its drive requirement. Gain control is linear in V/V throughout the gain adjustment range. Maximum gain can be set to be anywhere between 1V/V to 100V/V or higher. For linear in dB gain control applications, see LMH6502 datasheet.

The LMH6503 is available in the SOIC-14 and TSSOP-14 package.

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Technical documentation

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Type Title Date
* Datasheet LMH6503 Wideband, Low Power, Linear Variable Gain Amplifier datasheet (Rev. E) Apr. 04, 2013
White papers The Signal e-book: A compendium of blog posts on op amp design topics Mar. 28, 2017
User guides AN-1808 LMH730033 Evaluation Board (Rev. B) May 01, 2013

Design & development

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document-generic User guide

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 14-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
  • Serves as reference design to aid in high-speed PCB layout
  • Utilizes surface-mount components


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TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
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SOIC (D) 14 View options
TSSOP (PW) 14 View options

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