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SL3522AMC Datasheet(PDF) 4 Page - Mitel Networks Corporation |
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SL3522AMC Datasheet(HTML) 4 Page - Mitel Networks Corporation |
4 / 19 page 4 SL3522 Fig.4 Plot showing guaranteed dynamic range v. frequency (typical achievable dynamic range lines indicated across temperature) PRODUCT DESCRIPTION The SL3522 is a complete monolithic successive detection Log/limiting amplifier which can operate over an input frequency range of 100MHz to 500MHz. Producing a log/lin characteristic for input signals between -64dBm and +6dBm, the log amplifier can provide an accuracy of better than ±1.00dB at case temperatures of -55°C and +25°C and an accuracy of better than ±1.25dB at +125°C. The dynamic range is better than 75dB over a frequency range of 100MHz to 400MHz. The graph in fig 4 shows how the dynamic range is guaranteed over frequency. The SL3522 consists of 6 Gain stages, 7 Detector stages, a limiting RF Output buffer and a Video Output amplifier. The power supply connections to each section are isolated from each other to aid stability. The SL3522 consumes 1.1W of power when ALL parts of the circuit are powered up from a ±5.0V power supply. As the circuit uses a differential architecture, the power consumption of the RF gain/detector stages and RF Output Buffer will be independent of RF input signal level. However, the Video Output (pin 13) is driven by a single ended emitter follower and so the power consumption of the Video amplifier will vary with RF input signal level between pins 27 and 28.(upto 10mA over 2V video output range with max video load of 200 Ω //20pF) The SL3522 has a high RF gain (>50dB) across a wide bandwidth (>450MHz) when the limiting RF Output Buffer is enabled. The limiting RF Output Buffer provides a balanced Limited Output level of nominally –1.0dBm on each RF Output connection (pin 9 and 10), for RF input signal levels on pins 27 and 28 in excess of –50dBm. The limiting RF Output Buffer can be isolated from the other sections of the SL3522, by disconnecting the RF Output Buffer GND (pin 8) from 0V, and leave the pin floating. This feature aids stability in applications NOT requiring a Limited RF Output signal, and lowers the power consumption of the SL3522 to 0.95Watts, when the other sections are powered up from a ±5.0V power supply. Each of the Gain and Detector stages has approximately 12dB of gain, and a significant amount of on-chip RF decoupling (200pF per stage), also to aid stability. The Video amplifier provides a positive going output signal proportional to the log of the amplitude of an RF input applied between pins 27 and 28. The gain and the offset of the Video amplifier can be adjusted by 3 resistors; RG , RT , and RO which are connected to Gain adjust (pin 19),Trim reference (pin 18) and Offset adjust (pin 17). With RT set to 1.5kΩ , RG can be set to any value between 1k Ω and 2k2Ω and achieve a range in Video Slope of ±20%, centred on 21mV/dB. Similarly, R O can be set to any value between 1k Ω and 2.2KΩ and achieve an offset range of ±0.5V, which should allow the Video Offset to be trimmed to 0V if required. The RF input pins (27 and 28) have a 50 Ω terminating resistor connected between them on–chip. These are capacitively coupled to the I/P gain stage with 20pF on-chip capacitors. (Refer to APPLICATION NOTES section for information on how to connect an RF input signal to the device). 0 10 20 30 40 50 60 70 80 90 100 100 200 300 400 500 600 700 800 +125 °C –55 °C +25 °C Minimum guaranteed dynamic range (dB)” |
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