tza3050 NXP Semiconductors, tza3050 Datasheet - Page 12

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

Philips Semiconductors
11. Dynamic characteristics
Table 6:
T
to 3.47 V; R
R
[1]
12. Application information
9397 750 14806
Product data sheet
Symbol
RF path
BR
J
t
t
t
t
t
Current control
tc
t
t
Pulse width adjustment
t
t
t
r
su(D)
h(D)
o(en)
o(dis)
burst(min)
idle(max)
PWA(min)
PWA
PWA(max)
amb
MAXOP
(LA)(p-p)
, t
int
f
The switch-on and switch-off time at enable and disable given are the absolute maximum values. They depend strongly on the following
parameters: bias current, modulation current, bias inductance and laser supply voltage. More detailed information available upon
request.
= 40 C to +85 C; R
= 20 k ; positive currents flow into the IC; all voltages are referenced to ground; unless otherwise specified.
AVR
Dynamic characteristics
12.1.1 Bias and modulation currents
Parameter
bit rate
jitter of pin LA output signal
(peak-to-peak value)
rise and fall time of voltage
on pin LA
data input set-up time
data input hold time
switch-on time at enable
switch-off time at disable
average loop time constant
minimum burst time
maximum time between two
bursts
minimum pulse width
adjustment on pins LA
pulse width adjustment on
pins LA
maximum pulse width
adjustment on pins LA
= 7.5 k ; R
12.1 Design equations
The bias and modulation currents are determined by the voltages on pins BIASIN and
MODIN. 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
th(j-a)
MODIN
= 35 K/W; P
.
= 6.2 k ; R
tot
Conditions
average loop control
R
20 % to 80 %; R
I
from 50 % of enable to 90 %
of steady state typical bias and
modulation current
from 50 % of enable to 10 %
of steady state typical bias and
modulation current
average loop control;
C
ENABLE pin HIGH
ENABLE pin LOW
R
C
R
R
BIASIN
mod
L
CBIAS
PWA
PWA
PWA
PWA
= 420 mW; V
= 25
= 30 mA
= 6.7 k ;
< 100 pF
= 10 k ; C
= 20 k ; C
= 6.8 k ; R
Rev. 03 — 7 April 2005
= 100 nF
CCA
L
PWA
PWA
30 Mbits/s up to 1.25 Gbits/s burst mode laser driver
PWA
= 25 ;
= 3.14 V to 3.47 V; V
< 100 pF
< 100 pF
= 10 k ; R
RREF
[1]
[1]
= 10 k (1%); R
Min
0.03
-
-
60
60
-
-
-
30
-
-
-
50
CCD
= 3.14 V to 3.47 V; V
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Typ
-
-
120
-
-
-
-
5
-
-
0
100
100
MAXMON
TZA3050
Max
1.25
30
150
-
-
100
100
-
-
8
-
-
50
= 13 k ;
CCO
= 3.14 V
Unit
Gbits/s
ps
ps
ps
ps
ns
ns
ms
ms
ps
ps
ps
s
12 of 24