參數(shù)資料
型號(hào)： 935263842026
廠商： NXP SEMICONDUCTORS
元件分類： 其它接口
英文描述： SPECIALTY INTERFACE CIRCUIT, UUC40
封裝： DIE-40
文件頁(yè)數(shù)： 33/35頁(yè)
文件大?。?/td> 208K
代理商： 935263842026
2000 Feb 22
7
Philips Semiconductors
Product specication
Gigabit Ethernet/Fibre Channel laser
drivers
TZA3041AHL; TZA3041BHL;
TZA3041U
For ECL signals (negative and referenced to ground), the
inputs should be AC-coupled to the signal source.
If AC-coupling is applied, a constant input signal (either
LOW or HIGH) will cause the device to be in an undefined
state. To avoid this, it is recommended to apply a slight
offset to the input stage. The applied offset must be higher
than the specified value in Chapter “Characteristics”, but
much lower than the applied input voltage swing.
The RF path is fully differential and contains a differential
preamplifier and a main amplifier. The main amplifier is
able to operate at the large peak currents required at the
output laser driver stage and is insensitive to supply
voltage variations. The output signal from the main
amplifier drives a current switch which supplies a
guaranteed maximum modulation current of 60 mA to
pins LA and LAQ (see Fig.6). The BIAS pin outputs a
guaranteed maximum DC bias current of up to 90 mA for
adjusting the optical laser output to a level above its light
emitting threshold (see Fig.7).
Automatic laser control
A laser with a Monitor PhotoDiode (MPD) is required for
the laser control circuit (see application diagrams
Figs 18 and 19).
The MPD current is proportional to the laser emission and
is applied to pin MONIN. The MPD current range is
100 to 1000
A (p-p). The input buffer is optimized to cope
with an MPD capacitance of up to 50 pF. To prevent the
input buffer from oscillating if the MPD capacitance is low,
the capacitance should be increased to the minimum value
specified in Chapter “Characteristics”, by connecting a
capacitor between pin MONIN and VCC(G).
DC reference currents are applied to pins ONE and ZERO
to set the MPD reference levels for laser HIGH and laser
LOW respectively. This is adequately achieved by using
resistors to connect VCC(R) to pins ONE and ZERO
(see Fig.8), however, current DACs can also be used. The
voltages on pins ONE and ZERO are held at a constant
level of 1.5 V below VCC(R). The reference current applied
to pin ONE is internally multiplied by 16 and the reference
current flowing into pin ZERO is internally multiplied by 4.
The accuracy of the VCC(R) 1.5 V voltage at pins ONE
and ZERO is described in Section “Accuracy of voltage on
inputs: ONE, ZERO, ALARMLO, ALARMHI”.
handbook, halfpage
MGS906
GND
LA
LAQ
ALS
TR
TRn
Fig.6 LA and LAQ outputs.
handbook, halfpage
MGS907
GND
BIAS
ALS
TR
TRn
Fig.7 Laser driver bias current output circuit.
handbook, halfpage
MGS908
VCC(R)
GND
ONE, ZERO, ALARMLO, ALARMHI
50
A
30 k
Fig.8
ONE, ZERO, ALARMLO and ALARMHI
inputs.
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