Datasheet > DTR-622-SM-LC-A-HP-ST

DTR-622-SM-LC-A-HP-ST

更新时间： 2022-12-19 08:33:45

品牌	Logo	应用领域
OPLINK		/
页数	文件大小	规格书
7页	225K
描述
Multi-rate OC-12/STM-4 Single mode SFF Transceivers

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OC-12/STM-4 LC Single Mode Transceiver: DTR-622-SM-LC/LS-MR

Application Notes

Transmitter: When the DATA+ input is at logic HIGH and Receiver: Both differential DATA+ and DATA- outputs are LV-

DATA- input is at logic LOW, the Laser Diode is ON; and vice PECL levels requiring proper termination (see recommended

versa. The transmitter is normally enabled (i.e. when the TX interface circuits). For optimum performance, both outputs

DISABLE control input is not connected). When the TX should be terminated in the same manner, even if only one is

DISABLE control input voltage is higher than V_CC- 1.3 V, the used.

laser is turned off independent of the input data. The transmitter

The Signal Detect circuit monitors the level of the incoming

has two options for input termination. With “MS” and “MSE”

optical signal and generates a logic LOW signal when

versions, the transmitter input interface is standard LV-PECL(i.e.

insufficient photocurrent is produced. If the SIGNAL DETECT

normal resistor termination needs to be provided by the end

output is LV-TTLlevel, no termination is required. If the SIGNAL

user). With the “M” and “ME” version, an internal differential

DETECT output is LV-PECLlevel, a termination resistor of 160

ohms to GND is required.

100 ohm resistor termination is provided at the transmitter input

interface for convenience (see circuit diagrams below.)

Interface circuit: The power supply line should be well-filtered.

All 0.1 µF power supply bypass capacitors should be as close

to the DTR transceiver module as possible. The two front GND

The transmitter incorporates anAverage Power Control (APC)

loop to stabilize the transmitter average optical output power

against temperature variation. The APC loop always acts to

posts (mounting studs) should be grounded to Circuit Ground

keep the transmitter average optical output power at a constant

or Chassis Ground. The Transmitter has internal 50 ohm

value. Therefore, when the input data is all continuous “zeroes”

termination (see interface circuits).

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).

Internal Termination (for “M” & “ME” version)

+3.3 volt

Capacitor values in µF, Resistor values in ohm

1 µH coil or

ferrite inductor

0.1

160

50 ohm line

H coil or

TXD+

ferrite inductor

LV-PECL

100

50 ohm line

0.1

TXD -

RXD+

50 ohm line

DTR-622-SM-LC-MR

TX DISABLE

100

50 ohm line

160

RXD -

SIGNAL DETECT

GND

POSTS

160

21737-0375, Rev. B

06-12-2003

1 2 345 6 7

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