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AN6123 Datasheet(PDF) 4 Page - Panasonic Semiconductor |
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AN6123 Datasheet(HTML) 4 Page - Panasonic Semiconductor |
4 / 5 page 4 AN6213MS ICs for Telephone s Application Notes (continued) 2. Input level adjustment for maximum output You can adjust R in the left circuit diagram to find the operation point for a maximum out- put level. For example, since the input level for a maximum output is −30 dBm when R is open and the attenuation in the input stage is 20 log (3k/6.3k) = −6.4 dB when R is 3 kΩ. This means a total gain loss is −6.4 dB as compared with open mode, hence the input level to get the maximum output is −23.6 dBm. Likewise, the attenuation is 12.7 dB for R = 1 k Ω and the desired input level becomes 17.3 dBm. I/O characteristics GND 10 k Ω 2 200 pF 33 µF 10 µF 10 µF 1M Ω 3.0 V Signal input (1 kHz) 4 3 2 5 1 AN6123MS R 3.3 k Ω Signal output −60 −70 −65 −60 −55 −50 −45 −40 −35 −30 −25 −20 −15 −10 −50 −55 −50 −40 −45 −35 −30 −25 −20 −15 −10 −5 0 Input level (dBm) R = 3 kΩ R = Open R = 1 kΩ 3. Output level adjustment for a maximum output The maximum output level can be adjusted by R in the left circuit diagram. Since the maximum output is −7.5 dBm when R is open, it is 20 log (20k/30k) = −3.5 dBm at R = 20 kΩ. It is an attenuated value of by 3.4 dB against open mode. Therefore, the maxi- mum output becomes −11 dBm. Likewise, for R = 10 kΩ, attenuation is 6 dB and the maximum output becomes −13.5 dBm. I/O characteristics −35 −30 −25 −20 −15 −10 −5 0 −50 −45 −40 −35 −30 −25 −20 −15 −10 Input level (dBm) R = 10 kΩ R = Open R = 20 kΩ GND 10 k Ω 2 200 pF 33 µF 10 µF 10 µF 1M Ω 3.0 V Signal output Signal input (1 kHz) 4 3 2 5 1 AN6123MS R 3.3 k Ω |
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