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參數(shù)資料
| 型號(hào)： | FOA2252A1 |
| 廠商： | SIEMENS A G |
| 元件分類： | 其它接口 |
| 英文描述： | 2.5 Gb/s Laser Driver(2.5 Gb/s激光驅(qū)動(dòng)器) |
| 中文描述： | SPECIALTY INTERFACE CIRCUIT, UUC28 |
| 封裝： | DIE-28 |
| 文件頁(yè)數(shù)： | 13/16頁(yè) |
| 文件大小： | 231K |
| 代理商： | FOA2252A1 |
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Semiconductor Group
13
August 98
FOA2251A1
FOA2252A1
I
NPUT
/ O
UTPUT
S
IGNAL
D
ESCRIPTION
Signal Name
D / DN
Function
Differential
Input
Explanation
Differential Data Input. D corresponds to O and DN to ON current output. With
a high level at D and a low level at DN modulation current is drawn by O and
ON is in high impedance state. With a low level at D and a high level at DN
modulation current is drawn by ON and O is in high impedance state. Both
inputs are prebiased to Vcc - 1 V, there input impedance is 5 k
.
With an external capacitor at C
FDEL
the laser fault detection delay time can be
adjusted. This means if a constant fault condition is present, a laser fault
indication will be generated and the laser will be shut down after this delay
time. The laser fault (LF) generation can be switched off if C
FDEL
is connected
to GND.
With an external capacitor at C
PDEL
the Power On Delay time can be adjusted.
There is no Power On Delay if C
PDEL
is shorted to V
CC
.
With an external capacitor at C
the delay time for detection of a low duty
cycle input situation can be adjusted. If the input signal monitor is not used
C
ISM
has to be pulled down by 10 k
resistor
A sink current drawn by IBIAS determines the laser diode bias current.
The controller characteristic can be set to an i-controller with an external
capacitor at C
BIAS
and the time constants are selectable.
S
BIAS
is an open collector output for pulling up a resistor to monitor the bias
current with a fixed relation.
This output can be connected to the base of an external bias current NPN
transistor. It can be left open if not used. It is dedicated for applications which
can not use the internal bias transistor because of too high circuit power
dissipation. The output is not activated if V
EE1
is connected to V
EE
.
Whenever the laser diode is disabled LD
OFF
will deliver a high voltage level
close to Vcc. This voltage is reduced by a minimum of 1.2 V if the laser diode
is enabled. This output can be tied to the base of a pnp transistor to support a
laser diode V
CC
shut down. If not used, this output can be left open without
laser driver performance restrictions.
A high level at LE enables, a low level disables the laser diode. For constant
enable this input can be tied to V
CC
.
A low level at LEN enables, a high level disables the laser diode. For constant
enable this input can be tied to GND.
Fault Indicator. A high level is generated whenever a fault situation is detected
by the supervisor circuit. Fault situations are laser power failures indicated by
MD input voltage deviation from VMDnom.
This is the controller feedback input. The voltage at this input represents the
monitor diode current and by this the laser output power. The bias current will
be controlled to an equal level of MD and V
MDR
.
An external resistor at MOD sets the modulation current level.
These output signals drive the modulation current switched by D / DN data
inputs and leveled by MOD, TC and chip junction temperature.
C
FDEL
Control
C
PDE
L
Control
C
ISM
Control
I
BIAS
C
BIAS
Bias Output
Control
S
BIAS
Monitor
Output
Bias Output
V
BIAS
LD
OFF
Laser Shut
Down
Output
LE
Logic Input
LEN
Logic Input
LF
Logic
Output
MD
Monitor
Diode Input
MOD
O / ON
Control
Differential
Current
Output
Logic Input
RSTN
Low active reset input. This input resets the LF indication if present. Further
the laser diode is held within shut down mode if this signal is at low level. For
constant laser diode enable this signal can be tied to V
CC
.
An external resistor at TC sets the modulation current temperature coefficient.
The temperature information is derived from chip junction temperature.
Positive power supply for analog circuit part.
TC
Control
V
CCA
Power
Supply
Power
Supply
Power
Supply
Power
Supply
Power
Supply
Reference
Voltage
V
CCD
Positive power supply for digital circuit part.
V
EE1
Negative power supply, only connected to the output stage of bias generator,
normally GND.
Negative power supply, only connected to the output stage and the stage
before of modulator, normally GND.
Negative power supply of the rest of circuit, normally GND.
V
EE2
V
EE
V
REF
V
REF
is a reference voltage output.
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