LMH6503| Datasheet

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LMH6503 Wideband, Low Power, Linear Variable Gain Amplifier

June 2004

LMH6503 Wideband, Low Power, Linear Variable Gain Amplifier
General Description
The LMHTM6503 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 10MHz. 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 guaranteed. The output current feedback Op Amp allows high frequency large signals (Slew Rate = 1800V/us) 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 su
pply 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.

Features
VS = 5V, TA = 25 C, RF = 1k, RG = 174, RL = 100, AV = AV(MAX) = 10, Typical values unless specified. n -3dB BW 135MHz n Gain control BW 100MHz n Adjustment range (typical over temp) 70dB 0.7dB n Gain matching (limit) n Slew rate 1800V/us n Supply current (no load) 37mA 75mA n Linear output current 3.2V n Output voltage (RL = 100) n Input voltage noise 6.6nV/ n Input current noise 2.4pA/ n THD (20MHz, RL = 100, VO = 2VPP) -57dBc n Replacement for CLC522

Applications
n n n n Variable attenuator AGC Voltage controller filter Multiplier

Typical Application

20073913

Gain vs. VG for Various Temperature

20073933

AVMAX = 10V/V

LMHTM is a trademark of National Semiconductor Corporation.

2004 National Semiconductor Corporation

DS200739

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