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
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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