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LT5506 Dataheets PDF



Part Number LT5506
Manufacturers Linear
Logo Linear
Description 40MHz to 500MHz Quadrature Demodulator
Datasheet LT5506 DatasheetLT5506 Datasheet (PDF)

U U LT5506 FEATURES s Wide Range 1.8V to 5.25V Supply s Frequency Range: 40MHz to 500MHz s –4dB to 59dB Variable Power Gain s THD < 0.12% (–58dBc) at 800mVP-P Differential Output Level s 8.8MHz I/Q Lowpass Output Noise Filters s IF Overload Detector s Baseband I/Q Amplitude Imbalance: 0.2dB s Baseband I/Q Phase Imbalance: 0.6° s 6.8dB Noise Figure at Max Gain s Input IP3 at Low Gain: – 0.5dBm s Low Supply Current: 27mA s Low Delay Shift Over Gain Control Range: 2ps/dB s Outputs Biased Up While.

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U U LT5506 FEATURES s Wide Range 1.8V to 5.25V Supply s Frequency Range: 40MHz to 500MHz s –4dB to 59dB Variable Power Gain s THD < 0.12% (–58dBc) at 800mVP-P Differential Output Level s 8.8MHz I/Q Lowpass Output Noise Filters s IF Overload Detector s Baseband I/Q Amplitude Imbalance: 0.2dB s Baseband I/Q Phase Imbalance: 0.6° s 6.8dB Noise Figure at Max Gain s Input IP3 at Low Gain: – 0.5dBm s Low Supply Current: 27mA s Low Delay Shift Over Gain Control Range: 2ps/dB s Outputs Biased Up While in Standby s 16-Lead QFN 4mm x 4mm Package with Exposed Pad U APPLICATIO S s IEEE802.11 s High Speed Wireless LAN s Wireless Local Loop 40MHz to 500MHz Quadrature Demodulator with VGA DESCRIPTIO The LT®5506 is a 40MHz to 500MHz monolithic integrated quadrature demodulator with variable gain amplifier (VGA), designed for low voltage operation. It supports standards that use a linear modulation format. The chip consists of a VGA, quadrature down-converting mixers and lowpass noise filters. The LO port consists of a divide-by-two stage and LO buffers. The IC provides all building blocks for IF down-conversion to I and Q baseband signals with a single supply voltage of 1.8V to 5.25V. The VGA gain has a linearin-dB relationship to the control input voltage. Hard-clipping amplifiers at the mixer outputs reduce the recovery time from a signal overload condition. The lowpass filters reduce the out-of-band noise and spurious frequency components. The cut-off frequency of the noise filters is approximately 8.8MHz. The external 2xLO frequency is required to be twice the IF input frequency for the mixers. The standby mode provides reduced supply current and fast transient response into the normal operating mode when the I/Q outputs are AC-coupled to a baseband chip. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO 280MHz IF INPUT L1 15nH C3 10pF L2 15nH IF+ IF – C2 1µF GAIN CONTROL 2xLO 560MHz INPUT C4 3.3pF C5 3.3pF VCTRL 2xLO+ L3 39nH 2xLO– EN ÷2 STBY ENABLE STANDBY 1.8V C1 1nF VCC GND IOUT+ IOUT– IF DET QOUT+ QOUT– LT5506 5506 TA01 C3 1.8pF THD (dBc) Total Harmonic Distortion vs IF Input Level at 1.8V Supply –30 fIF, 1 = 280MHz fIF, 2 = 280.1MHz –35 f2xLO = 570MHz 800mVP-P DIFFERENTIAL OUT –40 –45 –50 –55 –60 –60 –50 –40 –30 –20 –10 IF INPUT POWER EACH TONE (dBm) 5506 TA01b 5506fa 1 U WW W LT5506 ABSOLUTE AXI U RATI GS (Note 1) Supply Voltage ....................................................... 5.5V Differential Voltage Between 2xLO+ and 2xLO–.......... 4V IF+, IF– ............................................. –500mV to 500mV IOUT+, IOUT–, QOUT+, QOUT– .................. VCC – 1.8V to VCC Operating Ambient Temperature (Note 2) ...................................................–40°C to 85°C Storage Temperature Range ..................–65°C to 125°C Voltage on Any Pin Not to Exceed ........................ –500mV to VCC + 500mV UW U PACKAGE/ORDER I FOR ATIO TOP VIEW IOUT+ IOUT– QOUT+ QOUT– 16 15 14 13 GND 1 12 STBY IF+ 2 11 2xLO+ IF– 3 17 10 2xLO– GND 4 9 EN 5678 ORDER PART NUMBER LT5506EUF VCC VCTRL IF DET VCC UF PACKAGE 16-LEAD (4mm × 4mm) PLASTIC QFN TJMAX = 125°C, θJA = 37°C/W EXPOSED PAD (PIN 17) IS GROUND MUST BE SOLDERED TO PCB Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS VCC = 3V. f2xLO = 570MHz, P2xLO = –5dBm (Note 5), fIF = 284MHz, PIF = –30dBm, I and Q outputs 800mVP-P into 4kΩ differential load, TA = 25°C, EN = VCC, STBY = VCC, unless otherwise noted. (Note 3) SYMBOL IF Input fIF PARAMETER Frequency Range Nominal Input Level Input Impedance NF Noise Figure at Max Gain GL Min Gain (Note 4) GH Max Gain (Note 4) IIP3 Input IP3, Min Gain Input IP3, Max Gain IIP2 Input IP2, Max Gain Demodulator I/Q Output Nominal Voltage Swing Clipping Level DC Common Mode Voltage I/Q Amplitude Imbalance I/Q Phase Imbalance DC Offset Output Driving Capability STBY to Turn-On Delay I/Q Output 1dB Compression I/Q Output IM3 CONDITIONS RSOURCE = 200Ω Differential IF+, IF– to GND, EN = VCC IF+, IF– to GND, EN = GND VCTRL = 1.7V VCTRL = 0.2V VCTRL = 1.7V PIF = –22.5dBm (Note 7) PIF = –75dBm (Note 7) VCTRL = 1.7V (Note 6) (Note 6) (Note 8) (Note 8) (Notes 6, 8) Single Ended, CLOAD ≤ 10pF PIF, 1 = –25.5dBm, 280MHz PIF, 2 = –25.5dBm, 280.1MHz (Note 7) MIN TYP MAX UNITS 40 to 500 –79 to –22 100Ω//1.2pF 1pF 6.8 0.9 50 59 – 0.5 – 49 –8 8 MHz dBm dB dB dB dBm dBm dBm 0.8 1.25 VCC – 1.19 0.2 0.5 0.6 3 28 2 1.5 0.3 –11.5 – 50 VP-P VP-P V dB Deg mV kΩ µs dBm dBc 5506fa 2 LT5506 ELECTRICAL CHARACTERISTICS VCC = 3V. f2×LO = 570MHz, P2×LO = –5dBm (Note 5), fIF = 284MHz, PIF = –30dBm, I and Q outputs 800mVP-P into 4kΩ differential load, TA = 25°C, EN = VCC, STBY = VCC, unless otherwise noted. (Note 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Variable Gain Amplifier (VGA) Gain Slope Linearity Error Temperature Gain Shift Gain Control Response Time VCTRL = 0V to 1.4V T = –40°C to 85°C, .


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