National Semiconductor LMH6502 Wideband, Low Power, Linear-in-dB Variable Gain Amplifier Data Sheet

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LM ideband,Low ow er,Linear-in-d B Variable ain plifier

LMH6502 Wideband, Low Power, Linear-in-d B Variable Gain Amplifier General Description Features

The LMH™6502 is wideband DC coupled differential input VS ±5V, TA 25˚C, RF 1kΩ, RG 174Ω, RL 100Ω, AV voltage controlled gain stage followed by high-speed cur- AV(MAX) Typical values unless specified.

rent feedback Op Amp which can directly drive low imped- -3d B BW 130MHz ance load. Gain adjustment range is more than 70d B for up

Gain control BW 100MHz

to 10MHz.

Adjustment range (typical over temp) 70d B

Maximum gain is set by external components and the gain ±0.6d B

Gain matching (limit)

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

Slew rate 1800V/µs

300m W with speed of 130MHz. Output referred DC offset

Supply current (no load) 27m A

voltage is less than 350m V over the entire gain control

Linear output current ±75m A

voltage range. Device-to-device Gain matching is within

Output voltage (RL 100Ω) ±3.2V

±0.6d B at maximum gain. Furthermore, gain at any VG is

tested and the tolerance is guaranteed. The output current Input voltage noise 7.7n V/ feedback Op Amp allows high frequency large signals (Slew Input current noise 2.4p A/

Rate 1800V/µs) and can also drive heavy load current THD (20MHz, RL 100Ω, VO 2VPP) −53d Bc (75m A). Differential inputs allow common mode rejection in Replacement for CLC520 low level amplification or in applications where signals are carried over relatively long wires. For single ended opera-

Applications

tion, the unused input can easily be tied to ground (or to

Variable attenuator

virtual half-supply in single supply application). Inverting or

non-inverting gains could be obtained by choosing one input AGC polarity or the other. Voltage controller filter To provide ease of use when working with single supply, Video imaging processing

VG range is set to be from 0V to +2V relative to pin potential (ground pin). In single supply operation, this ground pin is tied to "virtual" half supply. LMH6502 gain control is linear in d B for large portion of the total gain control range. This makes the device suitable for AGC circuits among other applications. For linear gain con- trol applications, see the LMH6503 datasheet. The LMH6502 is available in the SOIC-14 and TSSOP-14 pack- age.

Typical Application

Gain vs. VG for Various Temperature

AVMAX 10V/V

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