
321737-0370, Rev. B
9-10-99
Transmitter: When the DA T A+ input is at logic HIGH and DAT A-
input is at logic LOW , the LD is ON; and vice versa. In single-ended
applications, the unused input pin should be biased to VCC - 1.29 V.
The transmitter is normally enabled (i.e. when the TX DISABLE input
is not connected). When the TX DISABLE input voltage is higher than
VCC - 2 V, the laser is turned off independent of the input data. A
Transmitter End-of-Life Alarm (TALM) is also provided, which will switch
to TTL level HIGH when the laser is reaching its End-of-Life.
The transmitter incorporates an A verage 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 (assuming
that the transmitter is enabled). Therefore, when the input data is all
continuous “zeroes” or all continuous “ones”, the transmitter optical
output power is a constant level equal to the nominal average optical
output power (not at the “OFF” level or at the “ON” level).
Receiver: Both differential outputs (DAT A+ and DA T A-, CLOCK+
and CLOCK-) are PECL levels requiring termination (50 ohms to
VCC - 2 volts or 510 ohms to GND is recommended). 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 TTL logic LOW signal when insufficient
DTC-01
Control
Circuit
Bias
Circuit
200 W
10 W
PD
I
mon
I
b
LD
3 KW
3 KW
FM
BM +
V
CC
V
CC
GND
GND
BM -
3 KW
photocurrent is produced.
Interface circuit: The power supply line should be well-filtered.
All 0.1 mF power supply bypass capacitors should be as close to
the DTC transceiver module as possible. The two front GND posts
should be grounded to Circuit Ground or Chassis Ground.
Laser Safety: All transmitters are Class I Laser products per FDA/
CDRH and IEC-825 standards. They must be operated under
specified operating conditions.
FC Receptacle Package
LD Bias
Monitor Circuit
DA TA & CLOCK Timing
LD Back Facet
Monitor Circuit
Dimension in inches [mm]
Optical Communication Products, Inc.
DA TE OF MANUFACTURE:
MANUFACTURED IN THE USA
This product complies with
21 CFR 1040.10 and 1040.1 1
Meets Class I Laser Safety Requirements
Receiver Electrical Interface (over Operating Case Temperature Range)
Electrical Power Supply Characteristics (over Operating Case Temperature Range)
Application Notes
Parameter Symbol Minimum Typical Maximum Units
Output HIGH Voltage (DATA & C LOCK) VOH VCC - 1.200 -VCC - 0.700 V
Output LOW Voltage (DATA & C LOCK) VOL VCC - 2.000 -VCC - 1.620 V
O utput Cur r ent IO--25mA
SIGNAL DETE CT Output HIGH Vo ltag e VOH 2.7 - VCC V
SIGNAL DE TE C T Output LOW Voltage VOL 0 - 0.50 V
Parameter Symbol Minimum Typical Maximum Units
Supply Volt age VCC 4.75 5.0 5.25 V
Supply Current TX ICC - 100 130 mA
RX ICC - 200 270 mA
DATA
CLOCK
Set-up
7.5 < tS < 12 ns Hold
7.5 < tH < 12 ns