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參數(shù)資料
| 型號： | TQ8219 |
| 英文描述： | Optoelectronic |
| 中文描述： | 光電 |
| 文件頁數(shù)： | 2/10頁 |
| 文件大?。?/td> | 385K |
| 代理商： | TQ8219 |
2
TQ8218/TQ8219
PRELIMINARY DATA SHEET
Rev 0.0.A
2.5Gb/s Output Driver
The TQ8218 has a high power output stage to provide
an output level suitable for directly driving a 4V
modulator or 80mA laser. The separate power supply
pin for the output stage is VDRIVE. When VDRIVE is
3.3V the back terminated output driver swing can be
between 0.75V to 4V. This corresponds to 15-80mA
into a 50
forward load. The amplified OC48/STM16
NRZ output stream is available as a differential or
single ended signal at DOUT and NDOUT. The unused
output in single ended driver applications must be
terminated.
The TQ8219 is designed without back-termination
resistors and is capable of switching 160mA of current
accross an external 25
load. The output is available
differentially or single-ended at DOUT and NDOUT. The
unused output in single ended applications must be
terminated in the same manner as its complement.
The data crossing level of the output eye can be
adjusted using VSYMX. VSYMX is preset internally to
provide a 50% duty cycle when it is left open (N.C.).
The output current level and voltage amplitude at DOUT
and NDOUT can be set using an external feedback
control loop. To set the output current level, connect
an external current source, Isource, equal to 10% of
the desired output, to VSEN10. Connect VLEVEL,
VSEN10 and VSEN1 to an amplifier, as shown in Figure
1, with a minimum input common mode range of
(Isource*50
)
. The choice of the external current
source also sets the output voltage swing.
Figure1. Level Control Circuit
-5.0V
Note
: 50 Ohm back termination resistors and VDRIVE pin are not
present in the TQ8219
3mA - 16mA
+3.3V
5
50
50
50
Pre Amp
VSEN1
VSEN10
VLEVEL
Isource
NDOUT
DOUT
VDRIVE
VEE
For example, to achieve the maximum swing of 4V into
25
(TQ8218
’
s 50
internal back-terminated
impedance in parallel with a 50
forward load)
,
a
16mA source must be used
(Isource*10*25
=
160mA*25
= 4V).
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