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AM79M576A-1 Arkusz danych(PDF) 11 Page - Advanced Micro Devices |
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AM79M576A-1 Arkusz danych(HTML) 11 Page - Advanced Micro Devices |
11 / 18 page SLIC Products 11 11. Total Harmonic distortion with metering is specified with a metering signal of 2.2 Vrms at the two-wire output, and a transmit signal of +3 dBm or receive signal of –4 dBm. The transmit or receive signals are single-frequency inputs, and the distortion is measured as the highest in band harmonic at the two-wire or the four-wire output relative to the input signal. 12. Noise with metering is measured by applying a 2.2 Vrms metering signal (measured at the two-wire output) and measuring the psophometric noise at the two-wire outputs over a 200 ms time interval. Note: * A logic Low on E0 disables DET output into the Open Collector state. Table 1. SLIC Decoding DET Output State C3 C2 C1 Two-Wire Status E0 = 1* E1 = 0 E0 = 1* E1 = 1 0 1 2 3 4 5 6 7 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1 Open Circuit Ringing Active On-hook TX (OHT) Tip Open Reserved Active Polarity Reversal OHT Polarity Reversal Ring trip Ring trip Loop detector Loop detector Loop detector Loop detector Loop detector Loop detector Ring trip Ring trip Ground key Ground key — — Ground key Ground key Table 2. User-Programmable Components ZT is connected between the VTX and RSN pins. The fuse resistors are RF, and Z2WIN is the desired two-wire AC input impedance. When computing ZT, the internal current amplifier pole and any external stray capacitance between VTX and RSN must be taken into account. ZRX is connected from VRX to RSN. ZT is defined above. This equation sets the receive gain to 0 dB when the SLIC terminates with an impedance equal to Z2WIN. RDC1, RDC2, and CDC form the network connected to the RDC pin. RDC1 and RDC2 are approximately equal. RD and CD form the network connected from RD to –5 V and IT is the threshold current between on-hook and off-hook. ZM is connected from VMG (metering source) to the RSN pin, VM2W is the desired magnitude of the metering signal at the 2-wire output (usually 2.2 Vrms) and K1 ( ) is defined below. where: CX = The values of the identical capacitors from A and B to GND metering frequency Z T 510 Z 2WIN 2R F ) – ( = Z RX 0.98 Z T () = R DC 1 R DC2 +50 R FEED 2R F – () • = C DC 1.5 ms R DC1 R DC 2 + R DC1 R DC 2 • --------------------------------- • = R D 365 I T ---------, =C D 0.5 ms R D ---------------- = Z M V MG V M2W ---------------- K 1 ω ()Z L Z T • Z T 0.51 V K 1 ω () 2R F Z L + () • • + ------------------------------------------------------------------------------------- • = ω K 1 ω () 1000 1j ω 11.5 10 9 – • CX 2 -------- + 36 Z L 2R F ++ () + -------------------------------------------------------------------------------------------------------- = ω 2 π• = |
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Podobny opis - AM79M576A-1 |
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