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LMH6502 Dataheets PDF



Part Number LMH6502
Manufacturers National Semiconductor
Logo National Semiconductor
Description Wideband / Low Power / Linear-in-dB Variable Gain Amplifier
Datasheet LMH6502 DatasheetLMH6502 Datasheet (PDF)

LMH6502 Wideband, Low Power, Linear-in-dB Variable Gain Amplifier June 2004 LMH6502 Wideband, Low Power, Linear-in-dB Variable Gain Amplifier General Description The LMH™6502 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. P.

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LMH6502 Wideband, Low Power, Linear-in-dB Variable Gain Amplifier June 2004 LMH6502 Wideband, Low Power, Linear-in-dB Variable Gain Amplifier General Description The LMH™6502 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 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 guaranteed. 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. 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. 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-14 and TSSOP-14 package. Features VS = ± 5V, TA = 25˚C, RF = 1kΩ, RG = 174Ω, RL = 100Ω, AV = AV(MAX) = 10 Typical values unless specified. n -3dB BW 130MHz n Gain control BW 100MHz n Adjustment range (typical over temp) 70dB ± 0.6dB n Gain matching (limit) n Slew rate 1800V/µs n Supply current (no load) 27mA ± 75mA n Linear output current ± 3.2V n Output voltage (RL = 100Ω) n Input voltage noise 7.7nV/ n Input current noise 2.4pA/ n THD (20MHz, RL = 100Ω, VO = 2VPP) −53dBc n Replacement for CLC520 Applications n n n n Variable attenuator AGC Voltage controller filter Video imaging processing Gain vs. VG for Various Temperature Typical Application 20067737 20067706 AVMAX = 10V/V LMH™ is a trademark of National Semiconductor Corporation. © 2004 National Semiconductor Corporation DS200677 www.national.com LMH6502 Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. ESD Tolerance (Note 4): Human Body Machine Model Input Current VIN Differential Output Current Supply Voltages (V+ - V−) Voltage at Input/ Output pins Storage Temperature Range + − Junction Temperature Soldering Information: Infrared or Convection (20 sec) Wave Soldering (10 sec) +150˚C 235˚C 260˚C 2KV 200V Operating Ratings (Note 1) Supply Voltages (V+ - V−) Temperature Range Thermal Resistance: 14-Pin SOIC 14-Pin TSSOP (θJC) 45˚C/W 51˚C/W 5V to 12V −40˚C to +85˚C (θJA) 138˚C/W 160˚C/W ± 10mA ± (V -V ) 120mA (Note 3) 12.6V V +0.8V,V - 0.8V −65˚C to +150˚C + − Electrical Characteristics(Note 2) Unless otherwise specified, all limits guaranteed for TJ = 25˚C, VS = ± 5V, AV(MAX) = 10, VCM = 0V, RF = 1kΩ, RG = 174Ω, VIN_DIFF = ± 0.1V, RL = 100Ω, VG = +2V. Boldface limits apply at the temperature extremes. Symbol BW GF Parameter -3dB Bandwidth Gain Flatness Conditions VOUT < 0.5PP VOUT < 0.5PP, AV(MAX) = 100 VOUT < 0.5VPP 0.6V ≤ VG ≤ 2V, ± 0.3dB Min (Note 6) Typ (Note 6) 130 50 30 16 7.5 100 1.5 2.5 −47 72 67 2.2 10 1800 4.8 Max (Note 6) Units Frequency Domain Response MHz MHz Att Range Flat Band (Relative to Max Gain) Attenuation Range (Note 14) BW Control PL G Delay CT (dB) GR Gain control Bandwidth Linear Phase Deviation Group Delay Feed-through Gain Adjustment Range ± 0.2dB, f < 30MHz ± 0.1dB, f < 30MHz VG = 1V (Note 13) DC to 60MHz DC to 130MHz VG = 0V, 30MHz (Output Referred) f < 10MHz f < 30MHz dB MHz deg ns dB dB Time Domain Response tr, tf OS % SR ∆ G Rate Rise and Fall Time Overshoot Slew Rate Gain Change Rate 0.5V Step 0.5V Step 4V Step VIN = 0.3V, 10%-90% of Final Output 2VPP, 20MHz 2VPP, 20MHz 2VPP, 20MHz 1MHz to 150MHz 1MHz to 150MHz f = 4.43MHz, RL = 150Ω, Neg. Sync f = 4.43MHz, RL = 150Ω, Neg. Sync ns % V/µs dB/ns Distortion & Noise Performance HD2 HD3 THD En tot IN DG DP 2nd Harmonic Distortion 3rd Harmonic Distortion Total Harmonic Distortion Total Equivalent Input Noise Input Noise Current Differential Gain Differential Phase −55 −57 −53 7.7 2.4 0.34 0.10 dBc dBc dBc nV/ pA/ % deg www.national.com 2 LMH6502 Electrical Characteristics(Note 2) (Continued) Unless otherwise specified, all limits guaranteed for TJ = 25˚C.


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