ACS104A Ver la hoja de datos (PDF) - Semtech Corporation
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ACS104A Datasheet PDF : 12 Pages
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Advanced Communications
Dual Fiber link optimised for performance
Link Budget Example (Rtrc set so LED launch current = 100mA peak)
Fiber type
Fiber size
Minimum Transmit Couple power to fiber (µW)
Minimum PIN responsivity (A/W)
Minimum ACS104A sensitivity (nA)
Minimum input power to ACS104A amplifier (µW)
Link Budget (dB)
Average current consumption TxD = 19.2kbps (mA)
Average current consumption TxD = 64kbps (mA)
Plastic
1000 micron
1000
0.1
500
5
23
7
14
ACS104A Data Sheet
Glass
62.5 micron
120
0.6
500
0.83
21
7
14
Glass
50 micron
80
0.6
500
0.83
19.8
7
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
Fiber size
Minimum Transmit Couple power to fiber (µW)
Minimum PIN responsivity (A/W)
Minimum ACS104A sensitivity (nA)
2
Minimum input power to ACS104A amplifier (µW)
Link Budget (dB)
Average current consumption TxD = 19.2kbps (mA)
Average current consumption TxD = 64kbps (mA)
Plastic
1000 micron
125
0.1
500
5
13.9
2.2
3.4
Glass
62.5micron
13
0.6
500
0.83
12
2.2
3.4
Glass
50 micron
6.5
0.6
500
0.83
9
2.2
3.4
Calculating average current and power consumption
Average current
Iav (mA)
=
Power
P (mW)
=
XTAL* 10 -7 (1.3 + 3*(A + U *H ) ) + Itrc (A + U * H) + Iout + Ihbt
Iav (mA) * V
Terms used in current/power calculation:
XTAL = Crystal Oscillator Frequency, Hz
H
= Handshake on
H=1 for handshakes active
H=0 for handshakes at DC level
U
= Handshake constant
U = 0.001 when HD 2/1 = 0/0
U = 0.028 when HD 2/1 = 0/1
U = 0.014 when HD 2/1 = 1/0
U = 0.007 when HD 2/1 = 1/1
A
= Active window constant
A = 0.022 when DR 3/2/1 = 0/1/1
A = 0.03 when DR 3/2/1 = 1/0/0
A = 0.045 when DR 3/2/1 = 1/0/1
A = 0.08 when DR 3/2/1 = 1/1/0
A = 0.11 when DR 3/2/1 = 1/1/1
Iout = Average current sourced
mA
from digital outputs such
as (RxD,CTS,DSR,DCD)
Ihbt = Average current sourced
mA
from HBT pin.
(see section HBT Status pin)
Itrc
= Peak Transmit current
mA
set by TRC pin.
V
= Voltage supply to the ACS104 V
Power formula is only accurate
for voltage supply = 5 Volts
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 ACS104A, the optics and all related circuitry from the RS232 data lines.
6
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