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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