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50.0tlBm 0IP3 at 240MHz into a 100Q Diff Load 1 .OnV/VHz Total Input Noise >2.75Vp.p Linear Output Swing 100Q Differential Gain-Block Operation Input/Output Internally Matched to 100Q Diff Unconditionally Stable ■ OFDM Signal Chain Amplifier XT, 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. High Linearity Differential RF/IF Amplifier/ADC Driver The LTC®6430-15 is a differential gain block amplifier designed to drive high resolution, high speed ADCs with excellent linearity beyond 1000MHz and with low associ- ated output noise. The LTC6430-15 operatesfrom asingle 5V power supply and consumes only 800mW. In its differential configuration, the LTC6430-15 can directly drive the differential inputs of an ADC. Using 1:2 baluns, the device makes an excellent 50Q wideband balanced amplifier. While using 1:1.33 baluns, the device makes a high fidelity 50MHz to 1000MHz 75Q CATV amplifier. The LTC6430-15 is designed for ease of use, requiring a minimum of support components. The device is internally matched to 100Q differential source/load impedance. On- chip bias and temperature compensation ensure consistent performance over environmental changes. The LTC6430-15 uses a high performance SiGe BiCMOS process for excellent repeatability compared with similar GaAs amplifiers. All A-grade LTC6430-15devicesaretested housed in a 4mm x 4mm, 24-lead, QFN package with an exposed pad forthermal managementand low inductance. For a single-ended 50Q IF gain block with similar perfor- TVPicni nppucnTion ^^^J TECHNOLOGY
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ABSOLUTE mnximum RRTIRGS Operating Temperature Range (TQASE) ...-40°C to 85°C EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB ORD€R inFORfTlflTIOn The LTC6430-15 is available in two grades. The A-grade guarantees a minimum 0IP3 at 240MHz while the B-grade does not. Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on nonstandard 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:...
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The • denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, Vcc = 5V, ZSOURCE = ZLOAD = 10012, unless otherwise noted (Note 3). Measurements are performed using Test Circuit A, measuring from 50Q SMA to 50Q SMA without de-embedding (Note 4). SYMBOL PARAMETER Small Signal ^^^J TECHNOLOGY
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The • denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, Vcc = 5V, ZSOURCE = ZLOAD = 100Q, unless otherwise noted (Note 3). Measurements are performed using Test Circuit A, measuring from 50Q SMA to 50Q SMA without de-embedding (Note 4). SYMBOL PARAMETER Differential Power Gain ^^^J TECHNOLOGY
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The • denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, Vcc = 5V, ZSOURCE = ZLOAD = 10012, unless otherwise noted (Note 3). Measurements are performed using Test Circuit A, measuring from 50Q SMA to 50Q SMA without de-embedding (Note 4). Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device Note 2: Guaranteed by design and characterization. This parameter is not tested. Note...
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unless otherwise noted (Note 3). Measurements are performed using Test Circuit A, measuring from 50Q SMA to 50Q SMA without Differential Stability Factor K vs Frequency Over Temperature Noise Figure vs Frequency Over Temperature Differential Input Match (S11DD) vs Frequency Over Temperature vs Frequency Over Temperature Differential Reverse Isolation Differential Output Match (S22DD) vs Frequency Over Temperature Common Mode Gain (S21cc) vs Frequency Over Temperature vs Frequency Over Temperature ^^^J TECHNOLOGY
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unless otherwise noted (Note 3). Measurements are performed using Test Circuit A, measuring from 50Q SMA to 50Q SMA without Over Frequency 0IP3 vsTone Spacing Over HD2 vs Frequency Over PQUT HD3 vs Frequency Over PQUT HD4 vs Frequency Over PQUT ^^^J TECHNOLOGY
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unless otherwise noted (Note 3). Measurements are performed using Test Circuit A, measuring from 50Q SMA to 50Q SMA without Output Power vs Input Power Over Frequency Total Current (ITOT) VS VCC Total Current vs RF Input Power Total Current (IJOT) ^^^J TECHNOLOGY
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LTC6430-15 Pin Functions GND (Pins 8, 14, 17, 23, Exposed Pad Pin 25): Ground. For best RF performance, all ground pins should be connected to the printed circuit board ground plane. The exposed pad (Pin 25) should have multiple via holes to an underlying ground plane for low inductance and good thermal dissipation. +OUT (Pin 18): Positive Amplifier Output Pin. A transformer with a center tap tied to VCC or a choke inductor tied to 5V supply is required to provide DC current and RF isolation. For best performance select a choke with low loss and high self resonant frequency (SRF). See the...
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Differential Application Test Circuit A (Balanced Amp) Figure 1. Test Circuit A The LTC6430-15 is a highly linear, fixed-gain amplifier for differential signals. It can be considered a pair of 50Q single-ended devicesoperating 180degreesapart. Its core signal path consists of a single amplifier stage minimiz- ing stability issues. The input is a Darlington pairfor high input impedance and high current gain. Additional circuit enhancements increase the output impedance commen- surate with the input impedance and minimize the effects of internal Miller capacitance. The LTC6430-15 uses a...
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nppucnTions inFORmnnon The LTC6430-15 is a highly linear fixed-gain amplifier which is designed for ease of use. Both the input and output are internally matched to 100Q differential source and load impedancefrom 20MHzto 1700MHz. Biasing and temperature compensation are also handled internally to deliver optimized performance. The designer need only supply input/output blocking capacitors, RF chokes and decoupling capacitorsforthe5Vsupply. However, because the device is capable of such wideband operation, a single application circuit will probably not result in optimized performance across...
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