tza3050 NXP Semiconductors, tza3050 Datasheet - Page 14

• Manufacturer Part Number: tza3050
• Description: Tza3050 30 Mbits/s Up To 1.25 Gbits/s Burst Mode Laser Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 14806
Product data sheet
12.1.2 Average monitor current
12.1.3 Alarm operating current
The bias and modulation current sources are temperature compensated and keep the
adjusted current level stable over the temperature range.
The bias and modulation currents increase with increasing resistor values for R
R
The average monitor current I
source current of the AVR pin (I
source or by an external resistor, R
I
The average monitor current increases with decreasing I
allows resistor tuning of R
The formula used to program AVR is valid for typical conditions; tuning is necessary to
achieve absolute accuracy of the AVR value.
The operating current for the DC-coupled laser application equals the bias current plus
half of the modulation current:
The alarm threshold I
current of the MAXOP pin. The current range for I
corresponds with an I
I
av(MON)
oper
Fig 5. Typical average monitor current as a function of I
MODIN
=
I
respectively; this allows resistor tuning to start at a minimum current level.
= 1580
BIAS
I
av(MON)
+
( A)
----------
I
1300
mod
2
150
0
5.26
50
oper(alarm)
oper(alarm)
Rev. 03 — 7 April 2005
I
AVR
AVR
= 1580
av(MON)
to start at a minimum I
on the operating current is determined by the source
from 7.5 mA to 150 mA.
AVR
30 Mbits/s up to 1.25 Gbits/s burst mode laser driver
). The current can be sunk by an external current
AVR
in average loop operation is determined by the
, connected to ground. The equation is:
5.26
V
-------------
R
AVR
AVR
I
MAXOP
av(MON)
AVR
A]
= 1580
AVR
current level
is from 10 A to 200 A which
AVR
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
I
AVR
or increasing R
( A)
5.26
I
AVR
250
(Figure
TZA3050
A
mce137
AVR
5).
BIASIN
; this
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and