DTR-1250-SM2-LC Datasheet, PDF (3/5 Pages) OPLINK Communications Inc. – Laser Transceivers

DTR-1250-SM2-LC & DTR-1250-SM2-LS
Transmitter Electrical Interface (over Operating Case Temperature Range)
Parameter
Symbol Minimum
Typical
Maximum Units
Input HIGH Voltage
V_IH
V_CC - 1.165
-
V_CC - 0.880
V
Input LOW Voltage
V_IL
V_CC - 1.810
-
V_CC - 1.475
V
Data Input Current - HIGH
I_H
-
-
150
µA
Data Input Current - LOW
I_L
0.5
-
-
µA
Transmitter Disable Voltage
V_DIS
2.0
-
V_CC
V
Transmitter Enable Voltage
V_EN
0
-
0.8
V
Differential Bias Monitor Voltage (T_a = 25°C) V_BM+ - V_BM-
0.02
-
0.12
V
Differential Back Facet Monitor Voltage
V_FM+ - V_FM-
-
100
-
mV
Receiver Electrical Interface (over Operating Case Temperature Range)
Parameter
Output HIGH Voltage (LV-PECL) ¹
Output LOW Voltage (LV-PECL) ¹
Output HIGH Voltage (LV-TTL)
Output LOW Voltage (LV-TTL)
Output Current
1 _{With 50 ohm terminated to VCC - 2 volts.}
Symbol
V_OH
V_OL
V_OH
V_OL
I_O
Minimum
V_CC - 1.10
V_CC - 1.95
2.4
0
-
Typical
-
-
-
-
-
Maximum
V_CC - 0.70
V_CC - 1.50
V_CC
0.8
25
Units
V
V
mA
Application Notes
Transmitter: When the DATA+ input is at logic HIGH and
DATA- input is at logic LOW, the Laser Diode is ON; and vice
versa. The transmitter is normally enabled (i.e. when the TX
DISABLE control input is not connected). When the TX
DISABLE control input voltage is higher than V_CC - 1.3 V, the
laser is turned off independent of the input data.
The transmitter incorporates an Average Power Control (APC)
loop to stabilize the transmitter average optical output power
against temperature variation. The APC loop always acts to
keep the transmitter average optical output power at a constant
value. Therefore, when the input data is all continuous “zeroes”
or all continuous “ones”, the transmitter optical output power
is a constant level equal to thenominal average optical output
power (not at the “OFF” level or at the “ON” level).
Receiver: Both differential DATA+ and DATA- outputs are LV-
PECL levels requiring proper termination (see recommended
interface circuits). For optimum performance, both outputs
should be terminated in the same manner, even if only one is
used.
The Signal Detect circuit monitors the level of the incoming
optical signal and generates a logic LOW signal when insufficient
photocurrent is produced. If the SIGNAL DETECT output is
LV-TTL level, no termination is required. If the SIGNAL DETECT
output is LV-PECL level, a termination resistor of 160 ohms to
GND is required.
Pin Assignments
PIN
FUNCTION
PIN
FUNCTION
VCC
VCC
1 VPD
11 V_CCTX
I_b
10 Ω
LD
3 ΚΩ
3 ΚΩ
BM ⁺
BM ^-
I_mon
200 Ω
PD
3 ΚΩ
3 ΚΩ
FM ⁺
FM ^-
GND
GND
3
2 RX GND
12 TX GND
3 RX GND
13 TX DISABLE
4 N/C
14 TD+ (TX DATA IN +)
5 N/C
15 TD- (TX DATA IN -)
6 RX GND
16 TX GND
7 V_CCRX
8
SD (RX SIGNAL
DETECT)
9 RD- ( RX DATA OUT-)
17 BM - (BIAS MONITOR -)
18 BM + (BIAS MONITOR +)
19 FM - (FACET MONITOR -)
10 RD+ ( RX DATA OUT+)
20 FM + (FACET MONITOR +)
21737-0283, Rev.A
06-25-03