LMH6502
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SNOSA65D –OCTOBER 2003–REVISED MARCH 2013
LMH6502 Wideband, Low Power, Linear-in-dB Variable Gain Amplifier
Check for Samples: LMH6502
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FEATURES
DESCRIPTION
The LMH™6502 is
a
wideband DC coupled
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VS = ±5V, TA = 25°C, RF = 1kΩ, RG = 174Ω, RL =
100Ω, AV = AV(MAX) = 10 Typical Values Unless
Specified.
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.
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-3dB BW: 130MHz
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Gain Control BW: 100MHz
Maximum gain is set by external components and the
gain can be reduced all the way to cut-off. Power
consumption is 300mW with a speed of 130MHz.
Output referred DC offset voltage is less than 350mV
over the entire gain control voltage range. Device-to-
device Gain matching is within ±0.6dB 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.
Adjustment Range (Typical Over Temp): 70dB
Gain Matching (Limit): ±0.6dB
Slew Rate: 1800V/µs
Supply Current (No Load): 27mA
Linear Output Current: ±75mA
Output Voltage (RL = 100Ω): ±3.2V
Input Voltage Noise: 7.7nV/√Hz
Input Current Noise: 2.4pA/√Hz
THD (20MHz, RL = 100Ω, VO = 2VPP): −53dBc
Replacement for CLC520
APPLICATIONS
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Variable Attenuator
AGC
To provide ease of use when working with a single
supply, VG range is set to be from 0V to +2V relative
to pin 11 potential (ground pin). In single supply
operation, this ground pin is tied to a "virtual" half
supply.
Voltage Controller Filter
Video Imaging Processing
LMH6502 gain control is linear in dB for a large
portion of the total gain control range. This makes the
device suitable for AGC circuits among other
applications. For linear gain control applications, see
the LMH6503 datasheet. The LMH6502 is available in
the SOIC and TSSOP package.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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LMH is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2003–2013, Texas Instruments Incorporated