Datasheet LTC5533 (Analog Devices) - 9
| Fabricante | Analog Devices |
| Descripción | 300MHz to 11GHz Precision Dual RF Power Detector |
| Páginas / Página | 12 / 9 — APPLICATIO S I FOR ATIO. Operation. RF Detectors. Buffer Amplifiers. … |
| Formato / tamaño de archivo | PDF / 252 Kb |
| Idioma del documento | Inglés |
APPLICATIO S I FOR ATIO. Operation. RF Detectors. Buffer Amplifiers. Applications. Demo Board Schematic
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LTC5533
U U W U APPLICATIO S I FOR ATIO Operation
span the input range of a variety of analog-to-digital converters. V The LTC5533 contains two RF detector dice in one pack- OUT will not change until VOS exceeds 130mV. The voltage at V age forming two independent RF detector channels. Each OUT for VOS >130mV and with no RF signal present is: channel provides RF power detection over frequencies ranging from 300MHz to 11GHz. Channel functions include VOUT = VOS an internal frequency compensated buffer amplifier with the V gain set to 2x, an RF Schottky diode peak detector and level OUT will track VOS above 130mV. shift amplifier to convert the RF input signal to low frequency
RF Detectors
and a delay circuit to avoid voltage transients at VOUT when powering up. The LTC5533 has both shutdown and start- The internal RF Schottky diode peak detectors and level ing voltage adjustment capabilities. shift amplifiers convert the RF input signals to a low frequency signal. The detectors demonstrate excellent
Buffer Amplifiers
efficiency and linearity over a wide range of input power. The Schottky diodes are biased at about 55µA and drive The output buffer amplifiers are capable of supplying 25pF internal peak detector capacitors. typically 4mA into a load. These amplifiers have band- widths of 2MHz and a fixed internal gain of two.
Applications
The VOS inputs control the DC input voltages to the buffer The LTC5533 can be used as a self-standing signal amplifiers. VOS must be connected to ground if the DC strength measuring receiver for a wide range of input output voltage is not to be changed. The buffers are initially signals from –32dBm to 12dBm for frequencies from trimmed to approximately 130mV with VOS connected to 300MHz to 11GHz. Operation at higher frequencies is ground. achievable with reduced performance. Consult factory for The V more information. Figure 1 plots the output voltage as a OS pins are used to change the initial VOUT starting voltage. This function enables the LTC5533 outputs to function of RF input power of an 11GHz CW input signal.
Demo Board Schematic
VCC1 2.7V TO 6V C1 C2 0.1µF 100pF SHDN1 VOUT1 C3 C4 39pF OPT LTC5533 1 12 J1 VCC1 RFIN1 RF VOS1 2 11 IN1 C5 V R1 OUT1 GND C6 OPT 3 10 OPT V 39pF OS1 SHDN1 4 9 V J2 CC2 VCC2 RFIN2 2.7V TO 6V C7 C8 RF 5 8 IN2 R2 0.1µF 100pF VOUT2 GND 6 7 OPT VOS2 SHDN2 V 5533 BD OUT2 C9 13 SHDN2 OPT VOS2 C10 OPT 5533f 9
U U W U APPLICATIO S I FOR ATIO Operation
span the input range of a variety of analog-to-digital converters. V The LTC5533 contains two RF detector dice in one pack- OUT will not change until VOS exceeds 130mV. The voltage at V age forming two independent RF detector channels. Each OUT for VOS >130mV and with no RF signal present is: channel provides RF power detection over frequencies ranging from 300MHz to 11GHz. Channel functions include VOUT = VOS an internal frequency compensated buffer amplifier with the V gain set to 2x, an RF Schottky diode peak detector and level OUT will track VOS above 130mV. shift amplifier to convert the RF input signal to low frequency
RF Detectors
and a delay circuit to avoid voltage transients at VOUT when powering up. The LTC5533 has both shutdown and start- The internal RF Schottky diode peak detectors and level ing voltage adjustment capabilities. shift amplifiers convert the RF input signals to a low frequency signal. The detectors demonstrate excellent
Buffer Amplifiers
efficiency and linearity over a wide range of input power. The Schottky diodes are biased at about 55µA and drive The output buffer amplifiers are capable of supplying 25pF internal peak detector capacitors. typically 4mA into a load. These amplifiers have band- widths of 2MHz and a fixed internal gain of two.
Applications
The VOS inputs control the DC input voltages to the buffer The LTC5533 can be used as a self-standing signal amplifiers. VOS must be connected to ground if the DC strength measuring receiver for a wide range of input output voltage is not to be changed. The buffers are initially signals from –32dBm to 12dBm for frequencies from trimmed to approximately 130mV with VOS connected to 300MHz to 11GHz. Operation at higher frequencies is ground. achievable with reduced performance. Consult factory for The V more information. Figure 1 plots the output voltage as a OS pins are used to change the initial VOUT starting voltage. This function enables the LTC5533 outputs to function of RF input power of an 11GHz CW input signal.
Demo Board Schematic
VCC1 2.7V TO 6V C1 C2 0.1µF 100pF SHDN1 VOUT1 C3 C4 39pF OPT LTC5533 1 12 J1 VCC1 RFIN1 RF VOS1 2 11 IN1 C5 V R1 OUT1 GND C6 OPT 3 10 OPT V 39pF OS1 SHDN1 4 9 V J2 CC2 VCC2 RFIN2 2.7V TO 6V C7 C8 RF 5 8 IN2 R2 0.1µF 100pF VOUT2 GND 6 7 OPT VOS2 SHDN2 V 5533 BD OUT2 C9 13 SHDN2 OPT VOS2 C10 OPT 5533f 9