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| 型號(hào)： | TZA3019BVH |
| 英文描述： | TRANSIL |
| 中文描述： | 特定應(yīng)用功放|雙| LLCC | 32腳|塑料 |
| 文件頁數(shù)： | 15/28頁 |
| 文件大?。?/td> | 138K |
| 代理商： | TZA3019BVH |
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2003 Apr 02
15
Philips Semiconductors
Product specification
30 Mbits/s up to 3.2 Gbits/s
A-rate
TM
laser drivers
TZA3011A; TZA3011B
12 APPLICATION INFORMATION
12.1
Design equations
12.1.1
B
IAS AND MODULATION CURRENTS
The bias and modulation currents are determined by the
voltages on pins BIASIN and MODIN. These voltages are
applied by the BIASOUT and MODOUT pins for dual-loop
control. For average loop control the BIASIN voltage is
applied by the BIASOUT pin and the MODIN voltage is
applied by an external voltage source or an external
resistor R
MODIN
.
For direct setting of bias and the modulation current, the
BIASIN and MODIN voltages have to be applied by
external voltage sources or by R
BIASIN
and R
MODIN
external resistors connected on BIASIN and MODIN pins:
I
BIAS
= (R
BIASIN
×
100
μ
A
0.5 V)
×
g
m(bias)
[mA]
I
mod
= (R
MODIN
×
100
μ
A
0.5 V)
×
g
m(mod)
+ 5 [mA]
The bias and modulation current sources operate with an
input voltage range from 0.5 to 1.5 V. The output current is
at its minimum level for an input voltage below 0.4 V;
see Figs 3 and 4.
The bias and modulation current sources are temperature
compensated and the adjusted current level remains
stable over the temperature range.
The bias and modulation currents increase with increasing
resistor values for R
BIASIN
and R
MODIN
respectively, this
allows resistor tuning to start at a minimum current level.
12.1.2
A
VERAGE MONITOR CURRENT AND EXTINCTION
RATIO
The average monitor current I
av(MON)
in dual-loop or
average loop operation is determined by the source
current (I
AVR
) of the AVR pin. The current can be sunk by
anexternalcurrentsourceorbyanexternalresistor(R
AVR
)
connected to ground:
I
av(MON)
= 1580
5.26
×
I
AVR
=1580
5.26
×
[μ
A]
Theextinctionratioindual-loopoperationisdeterminedby
the source current (I
ER
) of the ER pin. The current can be
sunk by an external current source or by an external
resistor (R
ER
) connected to ground:
I
2
μ
A
μ
A
The average monitor current and the extinction ratio as a
function of the I
AVR
and I
ER
current are illustrated in Fig.5.
The average monitor current increases with a decreasing
I
AVR
or increasing R
AVR
, this allows resistor tuning of R
AVR
to start at minimum I
AVR
current level.
The formulas used to program AVR and ER are valid for
typical conditions; tuning is necessary to achieve good
absolute accuracy of AVR and ER values.
handbook, halfpage
MGT890
VBIASIN (V)
IBIAS
(mA)
IBIAS(min)
gm(bias) =
110 mA/V
0
110
0.2
0.5
1.5
Fig.3 Bias current as a function of BIASIN voltage.
handbook, halfpage
MGT891
VMODIN (V)
Imod = Io(LA)
(mA)
Io(LA)(min)
gm(mod) =
100 mA/V
0
105
5
0.5
1.5
Fig.4
Modulation current as a function of MODIN
voltage.
LA current when LA output is on.
V
o(LA)
= V
CCO
.
V
R
AVR
-------------
ER
20
--------------
–
20
1
2
V
ER
R
×
–
=
=
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