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参数资料
| 型号： | IRMS6400 |
| 英文描述： | FIBER OPTIC TRANSCEIVER |
| 中文描述： | 光纤收发器 |
| 文件页数： | 4/10页 |
| 文件大小： | 643K |
| 代理商： | IRMS6400 |
2001 Infineon Technologies Corp. Optoelectronics Division San Jose, CA
www.infineon.com/opto 1-888-Infineon (1-888-463-4636)
IRMS6400/IRMT6400
4
March 21, 2000-19
Table 6. Transmitter Output
Output Pulse Width (1.15 MB)
—
120
215
400
ns
217 ns pulse in
Output Pulse Width at RxD (115 Kb/s)
—
1.4
1.63
2.5
μ
s
1.63 ns pulse in
Output Pulse Width at RxD (9.6 Kb/s)
—
1.4
6
22
μ
s
19.5
μ
s pulse in
Parameter
Transmit Delay
Min.
—
Typ.
15
Max.
—
Unit
ns
Conditions
125 ns pulse,
V
CC
=5.0 V
TxD pulse>100
μ
s, 5.0 V pulse,
V
CC
=5.0 V
I
F
=20 mA DC
TxD=
V
CC
, LED anode=5.0 V,
V
CC
=5.0 V,
averaged over 125 ns pulse
Pulse Width Limit
50
70
100
μ
s
TxD Peak Wavelength
850
870
900
nm
LED Anode Current Limit
510
610
680
mA
LED Anode Current Limit
310
450
550
mA
TxD=
V
CC
, LED anode=3.0 V,
V
CC
=3.0 V,
averaged over 125 ns pulse
LED Cathode Saturation Drop
—
0.3
0.4
V
400 mA,
V
CC
=2.7 V
10 ns pulse height,
V
CC
=5.0 V
(Note 4)
V
LED
=2.7 V, no resistor
V
LED
=2.7 V, no resistor
V
CC
Transient Immunity
Transmit output rise and fall time (t
r
, t
f)
10
Radiant Intensity (peak, 4 Mb/s mode)
V
CC
±1
V
CC
±2
—
—
V peak
40
ns
100
170
400
mW/sr
Table 5:
Receiver Parameters, Low Rate Mode (SIR/MIR),
T
A
=25
°
C (except where noted) (Continued)
Mode Switching
(see Figure 2.)
Normally the IRMS6400/IRMT6400 Series initializes in the SIR/
MIR (9.6 Kb/s to 1.152 Mb/s) mode upon power-up. Switching
the module to FIR (4 Mb/s) Mode can be achieved as follows:
Bring Shut Down (SD)/Mode pin to a logic
“
High
”
status.
Bring TxD input to a logic
“
High
”
status. Wait for t
s
≥
–
40
ns.
Bring Shut Down (SD)/Mode pin to a logic
“
Low
”
status. The
negative transition of this pulse will set the module mode to
(4 Mb/s) data rate by reading the state of TxD
.
Bring TxD to a logic
“
Low
”
after waiting for t
h
≥
90 ns.
Figure 2.
Switching Mode
Switching to SIR/MIR (9.6 Kb/s to 1.15 Mb/s) Mode:
Bring Shut Down (SD)/Mode pin to a logic
“
High
”
status.
Bring TxD input to a logic
“
Low
”
status. Wait for t
s
≥
–
40
ns.
Bring Shut Down (SD)/Mode pin to a logic
“
Low
”
status. The
negative transition of this pulse will set the module mode to
115 Kb/s data rate by reading the state of TxD.
SD/Mode
TxD
pulse will set the device into 4 Mb/s data rate mode
TxD
t
h
t
S
Pulse will set the device into SIR/MIR mode
Note 1:
For Shut Down (SD) current to fall below 1
μ
A requires driving the
Shut Down (SD) pin to within 0.5 V of
V
CC
to ensure cutoff of the
input PMOS transistor of the input CMOS totem pole.
Note 2:
Negative setup times indicate that the internal data propagation
time is longer than the latching signal propagation time. This is com-
mon on logic devices. It means that the TxD data can go away
before the negative Shut Down (SD) edge occurs and not lose the
data. (See application notes for more details).
Note 3:
Shut Down (SD) to transmit enable is the time required for the
transmit bias circuits to stabilize. Applying a transmit pulse before
this time has elapsed will reduce the transmit pulse width.
Note 4:
Transmit
V
CC
Transient Immunity measures the transmitter circuitry
immunity from large
V
CC
and ground return inductive transients
arising from the action of large transmitter di/dt currents on
V
CC
and
ground return trace inductances. This test applies a negative 10 ns
V
CC
pulse to simulate the effects of transmitter current induce
V
CC
transients (assuming the LED anode supply and
V
CC
have a shared
inductance) and measures for less than a 10% change in pulse
width or delivered charge on the initial pulse and subsequent pulse.
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