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LTC5505 Datasheet(PDF) 7 Page - Linear Technology |
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LTC5505 Datasheet(HTML) 7 Page - Linear Technology |
7 / 8 page LT5504 7 5504i VCC OUTPUT CURRENTS FROM RF AND IF DETECTORS VOUT CC 400 µA 5504 F04 + – TYPICAL APPLICATIO S Limiting Mixer and LPF The amplified RF signal is down-converted using the limiting mixer and LO signal. The resulting signal is filtered by the 3rd-order, 450MHz, integrated low pass filter (LPF). Only the desired IF signal is passed to the IF limiters for further detection. Any other mixing products, including LO feedthrough, are much reduced to maximize sensitivity. The receiver’s sensitivity is thus defined by the LPF band- width. IF Limiter The IF signal is then amplified through the multiple limiter stages for further signal detection. All DC offsets, includ- ing LO signal self-mixing, are eliminated by an internal DC offset cancellation circuit. Nevertheless, care should be taken in component placement and in PCB layout to minimize LO coupling to the RF port. Output Interface The output interface of the LT55O4 is shown in Figure 4. The output currents from the RF and IF detectors are summed and converted into an output voltage, VOUT. The maximum charging current available to the output load is about 400 µA. An internal compensation capacitor CC is used to guarantee stable operation for a large capacitive output load. The slew rate is 80V/ µs and the small signal output bandwidth is approximately 5MHz when the output is resistively terminated. When the output APPLICATIO S I FOR ATIO Figure 5. LT5504 Evaluation Board Circuit Schematic Figure 6.Component Side Silkscreen of Evaluation Board 5504 F04 1 2 3 4 8 7 6 5 VCC RF+ RF– GND VCC VOUT LO EN C2 100pF C3 1nF C7 100pF VOUT LO INPUT VCC R1 82 Ω R3 10k R2 200 Ω R5 500k R4 20k C1 100pF C4 1nF RF INPUT LT5504 JUMPER T1 TOKO 617DB-1022 is loaded with a large capacitor CL, the slew rate is limited to 400 µA/CL. For example, the slew rate is reduced to 4V/ µs when CL = 100pF. Figure 4. Simplified Circuit Schematic of the Output Interface Applications The LT5504 can be used as a self-standing signal strength- measuring receiver (RSSI) for a wide range of input signals from – 75dBm to +5dBm, for frequencies from 800MHz to 2.7GHz. The LT5504 can be used as a demodulator for AM and ASK modulated signals with data rates up to 5MHz. Depending on specific application needs, the RSSI output can be split into two branches, providing AC coupled data output, and DC coupled, RSSI output for signal strength measure- ments and AGC. Refer to Figure 5. The LT5504 can also be used as a wide range RF power detector for transmit power control. |
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