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UX2222

型号：

UX2222

描述：

155Mbps至2Gbps的激光驱动器， SFP / SFF>SFP激光驱动器>厂商：厦门优迅高速芯片有限公司>www.uxfastic.com[ 155Mbps to 2Gbps Laser Driver For SFP/SFF SFP 激光驱动器 厂商：厦门优迅高速芯片有限公司 www.uxfastic.com ]

品牌：

ETC[ ETC ]

页数：

5 页

PDF大小：

171 K

下载PDF手册
UX 2222  
155Mbps to 2Gbps Laser Driver  
General Description  
Features  
The UX2222 is a complete CMOS laser driver for  
SFP/SFF applications from 155Mbps to 2Gbps.It  
is fully compliant with the SFP MSA timing and  
the SFF-8472 transmit diagnostic requirements.  
The UX2222 consists of an automatic power  
control (APC) feedback loop, a reference voltage  
generator with temperature compensation and a  
safety-logic circuit. The UX2222 provides  
complementary output currents. The APC feature  
allows an optical transmitter to maintain constant  
average optical power by a monitor photodiode,  
despite changes in laser threshold current over  
temperature and lifetime. Optional temperature  
—
—
—
—
—
—
—
—
Single +3.3V Power Supply  
Automatic Average Power Control (APC)  
Modulation Compensation  
Fully Compliant with SFP and SFF-8472 MSA  
100mA Bias Current  
85mA Modulation Current  
Rise and Fall Times less than 250ps  
Apply to FP、DFB、VCSEL Laser  
Pin Configuration  
compensation  
compensates  
Laser  
Diode  
extinction ratio change with temperature.  
External resistors set the require laser current  
level. The UX2222 also provides transmit-disable  
control (TX_DISABLE), a single-point latched  
transmit-failure monitor output (TX_FAULT),  
photocurrent monitoring, and bias-current  
monitoring to indicate faults.  
Figure 1. Pin Configuration QFN 24  
Typical Application Circuit  
Figure 2. Typical Application Circuit  
www.uxfastic.com  
2007 Preliminary Datasheet  
1
UX 2222  
155Mbps to 2Gbps Laser Driver  
Pin Description  
Pin No.  
Name  
Function  
Connecting a resistor between this pin and ground sets the  
temperature coefficient of IMOD when temperature is higher than  
the threshold set by Rtth  
1
MODTC  
2,5,14,17  
VCC  
INP  
INN  
+3.3V Power Supply Voltage  
Noninverted data input  
3
4
Inverted data input  
Transmitter Disable, TTL. Laser output is disabled when DISABLE  
TX_DISABLE is asserted high or left unconnected. The laser output is enabled  
when this pin is asserted low  
6
7
Photodiode-current Monitor Output. Current out of this pin  
PC_MON  
develops a ground referenced voltage across an external resistor  
that is proportional to the monitor-diode current  
Bias-current Monitor Output. Current out of this pin develops a  
ground referenced voltage across an external resistor that is  
proportional to the bias current  
8
9
BC_MON  
Shutdown Driver Output, Voltage output to control an external  
transistor for optional shutdown circuitry  
SHUTDOWN  
10,12  
11  
GND  
TX_FAULT  
BIAS  
Ground  
Open-Collector Transmit Fault indicator  
Laser Bias-Current Output  
Inverted Data Output  
Data Output  
13  
15  
OUTN  
OUTP  
16  
18  
MD  
Photodiode feedback input pin  
Connect a capacitor(CAPC) between pin19(APCFILT1) and  
pin20(APCFILT1) to set the time constant of the APC feedback  
loop  
19  
APCFILT1  
20  
21  
22  
23  
APCFILT2  
APCSET  
MODSET  
RE  
(See pin 19)  
A resistor connected from this pin to ground sets the desired  
average optical power  
A resistor connected from this pin to Ground  
Connecting a resistor between this pin and ground sets the  
coefficient of IMOD by temperature. Leave open for zero-coupling  
Threshold temperature compensation. A resistor at this pin  
programs the temperature above which compensation is added to  
the modulation current optional  
24  
RTTH  
2007 Preliminary Datasheet  
www.uxfastic.com  
2
UX 2222  
155Mbps to 2Gbps Laser Driver  
Absolute Maximum Ratings  
Symbol  
VCC  
Parameter  
Power Supply (VCC-GND)  
Operating ambient  
Rating  
4
Units  
V
TA  
-40 to +85  
-65 to +150  
°C  
TSTG  
Storage temperature  
°C  
DC Characteristics  
Parameter  
Symbol  
IBIAS  
Min.  
Typ.  
Max.  
Units  
mA  
Range of Programmable Laser Bias Current  
Total Differential Input Signal  
The dc Voltage of Input  
IBIAS/IBC_MON  
100  
mV  
Vin  
200  
2400  
V
VMD  
0.6 VCC  
mA / mA  
mA / mA  
°C  
RBC_MON  
RPC_MON  
80  
1
IMD/IPC_MON  
Threshold-Setting Range for Temperature  
Compensate  
TTH  
-20  
+80  
IMOD Compensation-Setting Range by IBIAS  
mA / mA  
Re  
0
1.5  
Monitor-Diode Input Current Range  
TX_DISABLE Input High  
TX_DISABLE Input Low  
FAILOUT Output Low  
uA  
V
IMD  
VHI  
VLO  
VOL  
20  
2.0  
2000  
V
0.8  
0.4  
V
Shutdown Output High  
Shutdown Output Low  
V
VCC-0.4  
V
0.4  
AC Characteristics  
(RLOAD (at OUTP and OUTN) = 25Ω connected to VCC, Typical values are at VCC = +3.3V and TA = +25°C.) (Note 1)  
Symbol Parameter  
Conditions  
Min. Typ. Max. Units  
Range of  
Minimum differential input  
swing is 200mVp-p (Note 2)  
IMOD  
Programmable  
85  
mA  
ps  
Modulation Current  
IBIAS = 20mA, IMOD = 40mA,  
2.5ns unit interval; measured  
from 20% to 80%  
Modulation-Current  
Rise and Fall Time  
TR, TF  
150  
250  
2007 Preliminary Datasheet  
www.uxfastic.com  
3
UX 2222  
155Mbps to 2Gbps Laser Driver  
Modulation-Current  
Pulse-Width Distortion  
BIAS and Modulation  
Turn-on Delay  
IBIAS = 20mA, IMOD = 40mA,  
5ns period  
TPWD  
25  
ps  
us  
100  
Note 1: AC characteristics are guaranteed by design and characterization.  
Note 2: An 200mVp-p differential is equivalent to complementary 10mVp-p signals on VINP and VINN.  
Transmit diagnostic Characteristics  
Symbol Parameter  
Time to initialize,  
Conditions  
Min. Typ. Max. Units  
From power on or negation of  
TX_Fault using TX_Disable  
T_init  
including reset of  
TX_Fault  
21  
ms  
ns  
Time from fault to TX_Fault  
on.  
TX_Fault TX_Fault Assert Time  
250  
Time from falling edge of  
TX_Disable to when the  
modulated optical output  
rises above 90% of nominal  
Time from rising edge of  
TX_Disable to when the  
optical output falls below  
10% of nominal  
TX_Disable Negate  
T_on  
Time  
45  
us  
T_off  
TX_Disable Assert Time  
TX_Disable to reset  
350  
ns  
us  
T_reset  
TX_Disable must be held  
high to reset TX_fault  
10  
2007 Preliminary Datasheet  
www.uxfastic.com  
4
UX 2210  
155Mbps to 2Gbps Laser Diode Driver  
Package Information  
Figure 6. QFN24 Package  
5
2006 Preliminary Datasheet  
www.uxfastic.com  
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