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參數資料
| 型號： | TQ8318 |
| 英文描述： | Telecommunication IC |
| 中文描述： | 通信集成電路 |
| 文件頁數： | 2/10頁 |
| 文件大小： | 460K |
| 代理商： | TQ8318 |
2
TQ8318/TQ8319
PRELIMINARY DATA SHEET
10.8Gb/s Output Driver
These devices are extremely well suited to driving
a variety of Electro-optical devices that utilize a
grounded case. A +3.3V/-5V family of devices is
available for applications where the driven device
does not utilize a grounded case or where these
drivers are used in die form.
The TQ8318
’
s 50 ohm back-terminated high power
cascoded output stage drives between 1.0V and
3.0V of modulation into a single ended 50 ohm
external load (6.0V peak-peak in differential mode),
or between 20mA and 60mA for DML applications.
A variant without the back-terminations, the
TQ8319, may be used in 25 ohm external load
applications to modulate up to 120 mA. The
separate power supply pins for the output stage are
DRIVEGND = 0V and VEE = -7.5V. Note that outputs
may be driven as differential or single ended signals
at DOUT and NDOUT and that a CML drive level is
possible by adjusting the output level control to an
appropriate level. Unused output complements
must be tied as 50 ohm (TQ8318, 25 ohm for
TQ8319) to GND when direct coupling is used.
The data amplitude may be adjusted using VLEVEL
and the crossing level of the output data eye can be
adjusted using VSYMX. Both of these levels are
preset internally if VLEVEL and VSYMX are left
open (N.C.). The DC offset, on DOUT and NDOUT
may be biased to a DC level with a voltage control
on BIAS from 0V/0mA to -1.0V/40mA (25 ohms).
The output current level and voltage amplitude at
DOUT and NDOUT may be set using an external
feedback control loop. To set the output current
level, connect an external current source, Isource,
equal to 20% 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 ohm
)
above VEE. The
choice of the external current source also sets the output voltage
swing. For example, to achieve the maximum swing of 3.0V into
25 ohm (50 ohm internal back-terminated impedance in parallel
with a 50 ohm forward load)
,
a 12mA source must be used
(Isource*10*25 ohm
=
120mA*25 ohm
= 3.0V). Note that
feedback with a back facet monitor or PiN diode provides a more
ideal method to control optical output power and extinction ratio,
if available. Figure 1 depicts a DML application, though similar
considerations can be made for either EAM/EML or differential
MZM applications.
25 ohm typ
Figure1. Level Control Circuit
50 ohm
Grounded Case
BIAS
4mA - 12mA
5
50
50
50
Pre Amp
VSEN1
VSEN10
VLEVEL
Isource
NDOUT
DOUT
DRIVEGND
Vee
-7.5V
DML
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