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LTC6412 Dataheets PDF



Part Number LTC6412
Manufacturers Linear Technology Corporation
Logo Linear Technology Corporation
Description 31dB Range Analog-Controlled VGA
Datasheet LTC6412 DatasheetLTC6412 Datasheet (PDF)

www.DataSheet4U.com LTC6412 800MHz, 31dB Range Analog-Controlled VGA DESCRIPTION The LTC®6412 is a fully differential variable gain amplifier with linear-in-dB analog gain control. It is designed for AC-coupled operation in IF receiver chains from 1MHz to 500MHz. The part has a constant OIP3 across a wide output amplitude range and across the 31dB gain control range. The output noise (NF + Gain) is also flat versus gain to provide a uniform spurious-free dynamic range (SFDR) >120dB over the full .

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www.DataSheet4U.com LTC6412 800MHz, 31dB Range Analog-Controlled VGA DESCRIPTION The LTC®6412 is a fully differential variable gain amplifier with linear-in-dB analog gain control. It is designed for AC-coupled operation in IF receiver chains from 1MHz to 500MHz. The part has a constant OIP3 across a wide output amplitude range and across the 31dB gain control range. The output noise (NF + Gain) is also flat versus gain to provide a uniform spurious-free dynamic range (SFDR) >120dB over the full gain control range at 240MHz. The LTC6412 is ideal for interfacing with the LT®5527 and LT5557 downconverting mixers, LTC6410-6 IF amplifier and the LTC6400/LTC6401/LTC6416 ADC drivers for use in 12-, 14-, and 16-bit ADC applications. The LTC6412 recovers quickly from an overdrive condition, and the EN pin allows for a fast output signal disable to protect sensitive downstream components. Asserting the SHDN pin reduces the current consumption below 1mA for power-down or sleep modes. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. FEATURES n n n n n n n n n n n n 800MHz –3dB Small-Signal Bandwidth Continuously-Adjustable Gain Control –14dB to +17dB Linear-in-dB Gain Range 35dBm OIP3 at 240MHz Across All Gain Settings 10dB Noise Figure at Maximum Gain (IIP3 – NF) = +8dBm at 240MHz Across All Gains 2.7nV/√Hz Input Referred Noise Differential Inputs and Outputs 50Ω Input Impedance Across all Gains Single Supply Operation from 3V to 3.6V 110mA Supply Current 4mm × 4mm × 0.75mm 24-Pin QFN Package APPLICATIONS n n n n IF Signal Chain Automatic Gain Control (AGC) 2.5G and 3G Cellular Basestation Transceivers WiMAX, WiBro, WLAN Receivers Satellite and GPS Receiver IF TYPICAL APPLICATION 3.3V Fully Differential 240MHz IF Receiver Chain with 31dB Gain Control 3.3V 3.3V 1nF VCC SHDN 10nF 0.1μF 180nH EN +OUT 0.1μF 180nH 3.3V BPF +IN V+ +OUT AIN+ LTC2208 AIN– VCM GND 6412 TA01 VGA Gain vs Frequency Over Gain Control Range 20 GMAX 3.3V VDD 10 GND VCM DECL1 DECL2 –VG VREF +VG IF INPUT LTC6412 –IN 10nF –OUT 0.1μF GAIN CONTROL (+ SLOPE MODE) LTC6400-8 VCM –IN V– –OUT GAIN (dB) +IN 0 –10 GMIN –20 2.2μF –30 1 10 100 1000 FREQUENCY (MHz) 10000 6412 G01 10nF 0.1μF 0.1μF 0.1μF 6412f 1 www.DataSheet4U.com LTC6412 PIN CONFIGURATION TOP VIEW SHDN GND GND VCC 18 GND 17 +OUT 25 16 –OUT 15 GND 14 DECL2 13 VCC 7 DECL1 8 GND 9 10 11 12 VREF GND +VG –VG VCC EN ABSOLUTE MAXIMUM RATINGS (Note 1) Total Supply Voltage (VCC to GND)...........................3.8V Amplifier Input Current (+IN, –IN)........................±20mA Amplifier Output Current (+OUT, –OUT) ...............±70mA Input Current (+VG, –VG, VREF, EN, SHDN ) .........±10mA Input Current (VCM, DECL1, DECL2) ....................±10mA RF Input Power, Continuous, 50Ω......................+15dBm RF Input Power, 100μs pulse, 50Ω ....................+20dBm Operating Temperature Range (Note 2).... –40°C to 85°C Specified Temperature Range (Note 3) .... –40°C to 85°C Storage Temperature Range................... –65°C to 150°C Junction Temperature ........................................... 150°C 24 23 22 21 20 19 GND 1 +IN 2 –IN 3 VCM 4 VCM 5 VCC 6 UF PACKAGE 24-LEAD (4mm s 4mm) PLASTIC QFN TJMAX = 150°C, θJA = 37°C/W EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH LTC6412CUF#PBF LTC6412IUF#PBF TAPE AND REEL LTC6412CUF#TRPBF LTC6412IUF#TRPBF PART MARKING* 6412 6412 PACKAGE DESCRIPTION 24-Lead (4mm × 4mm) Plastic QFN 24-Lead (4mm × 4mm) Plastic QFN SPECIFIED TEMPERATURE RANGE 0°C to 70°C –40°C to 85°C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ 6412f 2 www.DataSheet4U.com LTC6412 DC ELECTRICAL CHARACTERISTICS The l denotes specifications that apply over the full operating temperature range, otherwise specifications are at TA = 25°C. DC electrical performance measured using DC test circuit schematic. VIN(DIFF) is defined as (+IN) – (–IN). VOUT(DIFF) is defined as (+OUT) – (–OUT). VIN(CM) is defined as [(+IN) + (–IN)]/2. VOUT(CM) is defined as [(+OUT) + (–OUT)]/2. Unless noted otherwise, default operating conditions are VCC = 3.3V, EN = 0.8V, SHDN = 2.2V, +VG tied to VREF (negative gain slope mode), VOUT(CM) = 3.3V. Differential power gain defined at ZSOURCE = 50Ω differential and ZLOAD = 200Ω differential. SYMBOL GMAX GMIN GRANGE TCGAIN GSLOPE PARAMETER Maximum Differential Power Gain (Note 4) Minimum Differential Power Gain (Note 4) Differential Power Gain Range Temperature Coefficient of Gain at Fixed VG Gain Control Slope Average Con.


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