PDF LTC6431-15 Data sheet ( Hoja de datos )

Número de pieza	LTC6431-15
Descripción	Gain Block IF Amplifier
Fabricantes	Linear
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No Preview Available ! Features n 20MHz to 1700MHz Bandwidth n 15.5dB Power Gain n 47dBm OIP3 at 240MHz into a 50Ω Load n NF = 3.33dB at 240MHz n 1nV/√Hz Total Input Noise n S11 < –15dB Up to 1.2GHz n S22 < –15dB Up to 1.2GHz n > 2VP-P Linear Output Swing n P1dB = 20.6dBm n DC Power = 450mW n 50Ω Single-Ended Operation n Insensitive to VCC Variation n A-Grade 100% OIP3 Tested at 240MHz n Input/Output Internally Matched to 50Ω n Single 5V Supply n Unconditionally Stable Applications n Single-Ended IF Amplifier n ADC Driver n CATV Typical Application LTC6431-15 50Ω Gain Block IF Amplifier Description The LTC®6431-15 is a gain-block amplifier with excellent linearity at frequencies beyond 1000MHz and with low associated output noise. The unique combination of high linearity, low noise and low power dissipation make this an ideal candidate for many signal-chain applications. The LTC6431-15 is easy to use, requiring a minimum of external components. It is internally input/output matched to 50Ω and it draws only 90mA from a single 5V supply. On-chip bias and temperature compensation maintain performance over environmental changes. The LTC6431-15 uses a high performance SiGe BiCMOS process for excellent repeatability compared with similar GaAs amplifiers. All A-grade LTC6431-15 devices are tested and guaranteed for OIP3 at 240MHz. The LTC6431-15 is housed in a 4mm × 4mm 24-lead QFN package with an exposed pad for thermal management and low inductance. 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. Single-Ended IF Amplifier 5V VCC = 5V 1000pF RSOURCE 50Ω LTC6431-15 RF CHOKE, 560nH 1000pF RLOAD 50Ω 643115 TA01a OIP3 vs Frequency 50 48 46 44 42 40 VCC = 5V, T = 25°C 38 POUT = 2dBm/ TONE fSPACE = 1MHz 36 ZIN = ZOUT = 50Ω 0 200 400 600 FREQUENCY (MHz) 800 1000 643115 TA01b 643115f 1 1 page LTC6431-15 A C Electrical Characteristics TA = 25°C (Note 3), VCC = 5V, ZSOURCE = ZLOAD = 50Ω, unless otherwise noted. Measurements are performed using Test Circuit A, measuring from 50Ω SMA to 50Ω SMA without de-embedding (Note 4). SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Frequency = 700MHz S21 Power Gain De-Embedded to Package 15.2 dB OIP3 Output Third-Order Intercept Point POUT = 2dBm/Tone, Δf = 1MHz A-Grade B-Grade 40.0 dBm 39.0 dBm IM3 Third-Order Intermodulation POUT = 2dBm/Tone, Δf = 1MHz A-Grade B-Grade –76.0 –74.0 dBc dBc HD2 HD3 P1dB Second Harmonic Distortion Third Harmonic Distortion Output 1dB Compression Point POUT = 6dBm POUT = 6dBm –51.9 –69.0 20.3 dBc dBc dBm NF Noise Figure De-Embedded to Package 3.75 dB Frequency = 800MHz S21 Power Gain De-Embedded to Package 15.2 dB OIP3 Output Third-Order Intercept Point P OUT = 2 dBm/Ton e, Δf = 1MHz A-Grade B-Grade 39.0 dBm 38.0 dBm IM3 Third-Order Intermodulation P OUT = 2 dBm/Ton e, Δf = 1MHz A-Grade B-Grade –74 dBc –72 dBc HD2 HD3 P1dB Second Harmonic Distortion Third Harmonic Distortion Output 1dB Compression Point POUT = 6dBm POUT = 6dBm –49.2 –65.0 20.1 dBc dBc dBm NF Noise Figure De-Embedded to Package 3.83 dB Frequency = 900MHz S21 Power Gain De-Embedded to Package 15.1 dB OIP3 Output Third-Order Intercept Point POUT = 2dBm/Tone, Δf = 1MHz A-Grade B-Grade 38.5 dBm 37.5 dBm IM3 Third-Order Intermodulation POUT = 2dBm/Tone, Δf = 1MHz A-Grade B-Grade –73.0 –71.0 dBc dBc HD2 HD3 P1dB Second Harmonic Distortion Third Harmonic Distortion Output 1dB Compression Point POUT = 6dBm POUT = 6dBm –46.7 –63.0 19.9 dBc dBc dBm NF Noise Figure De-Embedded to Package 3.90 dB Frequency = 1000MHz S21 Power Gain De-Embedded to Package 15.0 dB OIP3 Output Third-Order Intercept Point POUT = 2dBm/Tone, Δf = 1MHz A-Grade B-Grade 38.0 dBm 37.0 dBm IM3 Third-Order Intermodulation POUT = 2dBm/Tone, Δf = 1MHz A-Grade B-Grade –72.0 –70.0 dBc dBc HD2 HD3 P1dB Second Harmonic Distortion Third Harmonic Distortion Output 1dB Compression Point POUT = 6dBm POUT = 6dBm –45.0 –59.0 19.5 dBc dBc dBm NF Noise Figure De-Embedded to Package 3.99 dB 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 reliability and lifetime. Note 2: Guaranteed by design and characterization. This parameter is not tested. Note 3: The LTC6431-15 is guaranteed functional over the case operating temperature range of –40°C to 85°C. Note 4: Small-signal parameters S and noise are de-embedded to the package pins, while large-signal parameters are measured directly from the circuit. 643115f 5 5 Page LTC6431-15 Applications Information The LTC6431-15 is a highly linear fixed-gain amplifier which is designed for ease of use. Implementing an RF gain stage is often a multistep project. Typically an RF designer must choose a bias point and design a bias network. Next the designer needs to address impedance matching with input and output matching networks and, finally, add stability networks to ensure stable operation in and out of band. These tasks are handled internally within the LTC6431-15. The LTC6431-15 has an internal self-biasing network which compensates for temperature variation and keeps the device biased for optimal linearity. Therefore, input and output DC blocking capacitors are required. Both the input and output are internally impedance matched to 50Ω from 20MHz to 1700MHz. Similarly, an RF choke is required at the output to deliver DC current to the device. The RF choke acts as a high impedance (isolation) to the DC supply which is at RF ground. Thus, the internal LTC6431-15 impedance matching is unaffected by the biasing network. The open collector output topology can deliver much more power than an amplifier whose collector is biased through a resistor or active load. Choosing the Right RF Choke Not all choke inductors are created equal. It is always important to select an inductor with low RLOSS, as this will drop the available voltage to the device. Also look for an inductor with high self-resonant frequency (SRF) as this will limit the upper frequency where the choke is useful. Above the SRF, the parasitic capacitance dominates and the choke impedance will drop. For these reasons, wire wound inductors are preferred, and multilayer ceramic chip inductors should be avoided for an RF choke. Since the LTC6431-15 is capable of such wideband operation, a single choke value will probably not result in optimized performance across its full frequency band. Table 1 lists target frequency bands and suggested corresponding inductor values. Table 1. Target Frequency Bands and Suggested Inductor Values FREQUENCY BAND INDUCTOR VALUE MODEL (MHz) (nH) NUMBER MANUFACTURER 20 to 100 100 to 500 1500nH 560nH 0805LS 0603LS Coilcraft www.coilcraft.com 500 to 1000 100nH 0603LS 1000 to 2000 51nH 0603LS DC Blocking Capacitor The role of a DC blocking capacitor is straightforward: block the path of DC current and allow a low series imped- ance path for the AC signal. Lower frequencies require a higher value of DC blocking capacitance. Generally, 1000pF to 10000pF will suffice for operation down to 20MHz. The LTC6431-15 is relatively insensitive to the choice of blocking capacitor. RF Bypass Capacitor RF bypass capacitors act to shunt AC signals to ground with a low impedance path. It is best to place them as close as possible to the DC power supply pins of the device. Any extra distance translates into additional series in- ductance which lowers the self-resonant frequency and useful bandwidth of the bypass capacitor. The suggested bypass capacitor network consists of two capacitors: a low value 1000pF capacitor to handle high frequencies in parallel with a larger 0.1µF capacitor to handle lower frequencies. Use ceramic capacitors of an appropriate physical size for each capacitance value (e.g., 0402 for the 1000pF, 0805 for the 0.1µF) to minimize the equiva- lent series resistance (ESR) of the capacitor. 643115f 11 11 Page

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