PDF LT5504 Data sheet ( Hoja de datos )

Número de pieza	LT5504
Descripción	800MHz to 2.7GHz RF Measuring Receiver
Fabricantes	Linear Technology
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No Preview Available ! FEATURES ■ RF Frequency Range: 800MHz to 2.7GHz ■ Ultra Wide Dynamic Range: 75dB at 900MHz ■ Wide Power Supply Range: 2.7V to 5.25V ■ Low Supply Current: 14.7mA at 3V ■ 8-Lead MS0P Package U APPLICATIO S ■ RSSI Measurements ■ Receive AGC ■ Transmit Power Control ■ ASK and Envelope Demodulation ■ GSM/TDMA/CDMA/WCDMA TYPICAL APPLICATIO LT5504 800MHz to 2.7GHz RF Measuring Receiver DESCRIPTIO The LT®5504 is an 800MHz to 2700MHz monolithic inte- grated measuring receiver, capable of detecting a wide dynamic range RF signal from –75dBm to +5dBm. The logarithm of the RF signal is precisely converted into a linear DC voltage. The LT5504 consists of RF/IF limiters, an LO buffer amplifier, a limiting mixer, a 3rd-order 450MHz integrated low pass filter, RF/IF detectors and an output interface. The ultrawide dynamic range is achieved by simultaneously measuring the RF signal and a down- converted IF signal obtained using the on-chip mixer and an external local oscillator. The RF- and IF-detected sig- nals are summed to generate an accurate linear DC voltage proportional to the input RF voltage (or power) in dB. The output is buffered with a low output impedance driver. , LTC and LT are registered trademarks of Linear Technology Corporation. C2 C1 1nF 100pF LT5504 RF INPUT RF RF+ DETECTOR R1 82Ω RF – ENABLE EN 3V VCC VOUT R2 200Ω IF DETECTOR ••• IF DETECTOR C3 10pF OUTPUT GND LO 5504 TA01a LO INPUT Output Voltage and Slope Variation vs RF Input Power 2.4 fRF = 900MHz fIF = 240MHz 2.0 AVERAGE SLOPE:23mV/dB 6 4 1.6 2 1.2 0 0.8 –2 0.4 –4 0 –6 –80 –70 –60 –50 –40 –30 –20 –10 0 10 PIN (dBm) 5504 TA01b 5504f 1 1 page LT5504 PI FU CTIO S VCC (Pins 1, 8 ): Power Supply Pins. These pins must be tied together at the part as close as possible, and should be decoupled using 1000pF capacitors. RF+ (Pin 2): Positive RF Input Pin. RF– (Pin 3): Negative RF Input Pin. GND (Pin 4): Ground Pin. EN (Pin 5): Enable Pin. The on/off threshold voltage is about VCC/2. When the input voltage is higher than 0.6 • VCC, the circuit is completely turned on. When the input voltage is less than 0.4 • VCC, the circuit is turned off. LO (Pin 6): Local Oscillator Input Pin. VOUT (Pin 7): Output Pin. BLOCK DIAGRA VCC 1 VCC 8 7 VOUT + RF+ 2 RF– 3 RF LIMITER DET DET LIMITING MIXER LPF IF LIMITER DET ••• IF LIMITER DET LO BUFFER 6 LO 4 GND ENABLE 5 EN 5504 BD APPLICATIO S I FOR ATIO The LT5504 consists of the following sections: RF/IF limiters, limiting mixer, RF/IF detectors, LO buffer ampli- fier, 3rd-order integrated low pass filter (LPF), output interface and bias circuitry. An RF signal ranging from 800MHz to 2.7GHz is detected by the RF and IF detectors using a proprietary technique. The down-converted IF signal is band limited by the on- chip LPF, reducing broadband noise, and thus an ultrawide dynamic range signal can be measured. The RF measuring receiver is essentially a logarithmic voltage detector. The measured output voltage is directly proportional to the RF signal voltage. An internal temperature compensation circuit results in a highly temperature-stable output volt- age. RF Limiter The differential input impedance of the RF limiter is shown in Figure 1. A 1:1 input transformer can be used to achieve 50Ω broadband matching with an 82Ω shunt resistor (R1) at the inputs as shown in Figure 5. The 1:1 RF input transformer can also be replaced with a narrow band single-ended-to-differential conversion cir- cuit using three discrete elements as shown in Figure 2. Their nominal values are listed in Table 1. Due to the parasitics of the PCB, these values may require adjust- ment. 5504f 5 5 Page

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