LTC6412 800MHz, 31dB Range Analog-Controlled VGA FEATURES DESCRIPTION n 800MHz 3dB Small-Signal Bandwidth The LTC 6412 is a fully differential variable gain ampli er n Continuously-Adjustable Gain Control with linear-in-dB analog gain control. It is designed for n 14dB to +17dB Linear-in-dB Gain Range AC-coupled operation in IF receiver chains from 1MHz n 35dBm OIP3 at 240MHz Across All Gain Settings to 500MHz. The part has a constant OIP3 across a wide n 10dB Noise Figure at Maximum Gain output amplitude range and across the 31dB gain control n (IIP3 NF) = +8dBm at 240MHz Across All Gains range. The output noise (NF + Gain) is also at versus gain n 2.7nV/Hz Input Referred Noise to provide a uniform spurious-free dynamic range (SFDR) n Differential Inputs and Outputs >120dB over the full gain control range at 240MHz. n 50 Input Impedance Across all Gains The LTC6412 is ideal for interfacing with the LT 5527 and n Single Supply Operation from 3V to 3.6V LT5557 downconverting mixers, LTC6410-6 IF ampli er n 110mA Supply Current and the LTC6400/LTC6401/LTC6416 ADC drivers for use n 4mm 4mm 0.75mm 24-Pin QFN Package in 12-, 14-, and 16-bit ADC applications. APPLICATIONS The LTC6412 recovers quickly from an overdrive condition, and the EN pin allows for a fast output signal disable to n IF Signal Chain Automatic Gain Control (AGC) protect sensitive downstream components. Asserting the n 2.5G and 3G Cellular Basestation Transceivers SHDN pin reduces the current consumption below 1mA n WiMAX, WiBro, WLAN Receivers for power-down or sleep modes. n Satellite and GPS Receiver IF 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. TYPICAL APPLICATION 3.3V Fully Differential 240MHz IF Receiver Chain with 31dB Gain Control VGA Gain vs Frequency Over Gain Control Range 3.3V 20 3.3V G MAX 0.1F 1nF 10 3.3V 3.3V 180nH 180nH 10nF BPF V DD +OUT +IN 0 + +OUT +IN + V A IN LTC6400-8 LTC6412 0.1F LTC2208 IF INPUT V CM A 10 IN IN V OUT IN OUT V GND CM 0.1F G MIN 10nF GAIN CONTROL 20 6412 TA01 (+ SLOPE MODE) 2.2F 30 0.1F 10nF 0.1F 0.1F 1 10 100 1000 10000 FREQUENCY (MHz) 6412 G01 6412fa 1 GND V CC V CM DECL1 SHDN DECL2 V G EN V REF +V G GAIN (dB)LTC6412 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) Total Supply Voltage (V to GND) ...........................3.8V TOP VIEW CC Ampli er Input Current (+IN, IN) ........................20mA Ampli er Output Current (+OUT, OUT) ...............70mA 24 23 22 21 20 19 Input Current (+V , V , V , EN, SHDN ) .........10mA G G REF GND 1 18 GND Input Current (V , DECL1, DECL2) ....................10mA +IN 2 17 +OUT CM IN OUT RF Input Power, Continuous, 50 ......................+15dBm 3 16 25 V 4 15 GND CM RF Input Power, 100s pulse, 50 ....................+20dBm V 5 14 DECL2 CM Operating Temperature Range (Note 2).... 40C to 85C V 6 13 V CC CC Speci ed Temperature Range (Note 3) .... 40C to 85C 7 8 9 10 11 12 Storage Temperature Range ................... 65C to 150C Junction Temperature ........................................... 150C UF PACKAGE 24-LEAD (4mm 4mm) PLASTIC QFNs T = 150C, = 37C/W JMAX JA EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LTC6412CUF PBF LTC6412CUF TRPBF 6412 0C to 70C 24-Lead (4mm 4mm) Plastic QFN LTC6412IUF PBF LTC6412IUF TRPBF 6412 24-Lead (4mm 4mm) Plastic QFN 40C to 85C Consult LTC Marketing for parts speci ed with wider operating temperature ranges. *The temperature grade is identi ed by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based nish parts. For more information on lead free part marking, go to: