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

1

FEATURES

DESCRIPTION

The

LMH™6502

is

a

wideband

DC

coupled

23

•

VS = ±5V, TA = 25°C, RF = 1kΩ, RG = 174Ω, RL =

differential

input

voltage

controlled

gain

stage

100

Ω, AV = AV(MAX) = 10 Typical Values Unless

followed by a high-speed current feedback Op Amp

Specified.

which can directly drive a low impedance load. Gain

•

-3dB BW: 130MHz

adjustment range is more than 70dB for up to 10MHz.

•

Gain Control BW: 100MHz

Maximum gain is set by external components and the

•

Adjustment Range (Typical Over Temp): 70dB

gain can be reduced all the way to cut-off. Power

consumption is 300mW with a speed of 130MHz.

•

Gain Matching (Limit): ±0.6dB

Output referred DC offset voltage is less than 350mV

•

Slew Rate: 1800V/µs

over the entire gain control voltage range. Device-to-

•

Supply Current (No Load): 27mA

device Gain matching is within ±0.6dB at maximum

gain. Furthermore, gain at any VG is tested and the

•

Linear Output Current: ±75mA

tolerance is ensured. The output current feedback Op

•

Output Voltage (RL = 100Ω): ±3.2V

Amp allows high frequency large signals (Slew Rate

•

Input Voltage Noise: 7.7nV/

√Hz

= 1800V/

μs) and can also drive heavy load current

•

Input Current Noise: 2.4pA/

√Hz

(75mA). Differential inputs allow common mode

rejection in low level amplification or in applications

•

THD (20MHz, RL = 100Ω, VO = 2VPP): −53dBc

where signals are carried over relatively long wires.

•

Replacement for CLC520

For single ended operation, the unused input can

easily be tied to ground (or to a virtual half-supply in

APPLICATIONS

single supply application). Inverting or non-inverting

gains could be obtained by choosing one input

•

Variable Attenuator

polarity or the other.

•

AGC

To provide ease of use when working with a single

•

Voltage Controller Filter

supply, VG range is set to be from 0V to +2V relative

•

Video Imaging Processing

to pin 11 potential (ground pin). In single supply

operation, this ground pin is tied to a "virtual" half

supply.

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.

1

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.

2

LMH is a trademark of Texas Instruments.

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2003–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.