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ACS102A Datasheet(PDF) 8 Page - Semtech Corporation |
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ACS102A Datasheet(HTML) 8 Page - Semtech Corporation |
8 / 13 page 8 2 Advanced Communications ACS102A Data Sheet Single Fiber link Link Budget Example (Rtrc set so LED launch current = 50mA peak) Fiber type Plastic Glass Glass Fiber size 1000 micron 62.5micron 50 micron Minimum Transmit Couple power to fiber (µW) 1000 60 40 Minimum LED responsivity (A/W) 0.01 0.16 0.16 Minimum ACS102A sensitivity (nA) 500 500 500 Minimum input power to ACS102A amplifier (µW) 50 3.1 3.1 Link Budget (dB) 10 13 11 Average current consumption TxD = 19.2kbps (mA) 3.8 3.8 3.8 Average current consumption TxD = 64kbps (mA) 7.2 7.2 7.2 Dual Fiber link optimised for performance Link Budget Example (Rtrc set so LED launch current = 100mA peak) Fiber type Plastic Glass Glass Fiber size 1000 micron 62.5 micron 50 micron Minimum Transmit Couple power to fiber (µW) 1000 120 80 Minimum PIN responsivity (A/W) 0.1 0.6 0.6 Minimum ACS102A sensitivity (nA) 500 500 500 Minimum input power to ACS102A amplifier (µW) 5 0.83 0.83 Link Budget (dB) 23 21 19.8 Average current consumption TxD = 19.2kbps (mA) 7 7 7 Average current consumption TxD = 64kbps (mA) 14 14 7.6 Dual Fiber link optimised for low power & low cost optical components Link Budget Example (Rtrc set so LED launch current = 12.5mA peak) Fiber type Plastic Glass Glass Fiber size 1000 micron 62.5micron 50 micron Minimum Transmit Couple power to fiber (µW) 125 13 6.5 Minimum PIN responsivity (A/W) 0.1 0.6 0.6 Minimum ACS102A sensitivity (nA) 500 500 500 Minimum input power to ACS102A amplifier (µW) 5 0.83 0.83 Link Budget (dB) 13.9 12 9 Average current consumption TxD = 19.2kbps (mA) 2.2 2.2 2.2 Average current consumption TxD = 64kbps (mA) 3.4 3.4 3.4 Calculating average current and power consumption Average current I av (mA) = XTAL* 10 -7 (1.3 + 3*(A + U *H ) ) + I trc (A + U * H) + Iout + Ihbt Power P (mW) = I av (mA) * V Terms used in current/power calculation: XTAL = Crystal Oscillator Frequency, Hz I out = Average current sourced mA H = Handshake on from digital outputs such H=1 for handshakes active as (RxD,CTS,DSR,DCD) H=0 for handshakes at DC level I hbt = Average current sourced mA U = Handshake constant from HBT pin. U = 0.001 when HD 2/1 = 0/0 (see section HBT Status pin) U = 0.028 when HD 2/1 = 0/1 U = 0.014 when HD 2/1 = 1/0 I trc = Peak Transmit current mA U = 0.007 when HD 2/1 = 1/1 set by TRC pin. A = Active window constant A = 0.022 when DR 3/2/1 = 0/1/1 V = Voltage supply to the ACS102 V A = 0.03 when DR 3/2/1 = 1/0/0 Power formula is only accurate A = 0.045 when DR 3/2/1 = 1/0/1 for voltage supply = 5 Volts A = 0.08 when DR 3/2/1 = 1/1/0 A = 0.11 when DR 3/2/1 = 1/1/1 Note : An application note on power extraction from the RS232 lines is available from Acapella. This shows a typical example circuit diagram for powering the ACS102A, the optics and all related circuitry from the RS232 data lines. |
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