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參數資料
| 型號： | AFBR-57D7APZ |
| 元件分類： | 光收發(fā) |
| 英文描述： | FIBER OPTIC TRANSCEIVER, 840-860nm, 8500Mbps(Tx), 8500Mbps(Rx), SURFACE MOUNT, LC CONNECTOR |
| 封裝： | ROHS COMPLIANT PACKAGE |
| 文件頁數： | 13/19頁 |
| 文件大小： | 246K |
| 代理商： | AFBR-57D7APZ |
3
Figure 1. Transceiver functional diagram.
Transmitter Section
The transmitter section includes the Transmitter Optical
SubAssembly (TOSA) and laser driver circuitry. The TOSA,
containing an 850 nm VCSEL (Vertical Cavity Surface
Emitting Laser) light source, is located at the optical
interface and mates with the LC optical connector. The
TOSA is driven by a custom IC which uses the incoming
differential high speed logic signal to modulate the laser
diode driver current. This Tx laser driver circuit regulates
the optical power at a constant level provided the
incoming data pattern is dc balanced (8B/10B code, for
example).
Transmit Disable (Tx_Disable)
The AFBR-57D7APZ accepts a TTL and CMOS compat-
ible transmit disable control signal input (pin 3) which
shuts down the transmitter optical output. A high signal
implements this function while a low signal allows normal
transceiver operation. In the event of a fault (e.g. eye safety
circuit activated), cycling this control signal resets the
module as depicted in Figure 4. An internal pull up resistor
disables the transceiver transmitter until the host pulls
the input low. Host systems should allow a 10 ms interval
between successive assertions of this control signal.
Tx_Disable can also be asserted via the two-wire serial
interface (address A2h, byte 110, bit 6) and monitored
(address A2h, byte 110, bit 7).
The contents of A2h, byte 110, bit 6 are logic OR’d with
hardware Tx_Disable (pin 3) to control transmitter
operation.
Transmit Fault (Tx_Fault)
A catastrophic laser fault will activate the transmitter
signal, TX_FAULT, and disable the laser. This signal is an
open collector output (pull-up required on the host board).
A low signal indicates normal laser operation and a high
signal indicates a fault. The TX_FAULT will be latched high
when a laser fault occurs and is cleared by toggling the
TX_DISABLE input or power cycling the transceiver. The
transmitter fault condition can also be monitored via the
two-wire serial interface (address A2, byte 110, bit 2).
Eye Safety Circuit
The AFBR-57D7APZ provides Class 1 (single fault tolerant)
eye safety by design and has been tested for compliance
with the requirements listed in Table 1. The eye safety
circuit continuously monitors the optical output power
level and will disable the transmitter upon detecting an
unsafe condition beyond the scope of Class 1 certification.
Such unsafe conditions can be due to inputs from the host
board (Vcc fluctuation, unbalanced code) or a fault within
the transceiver.
LIGHT FROM FIBER
LIGHT TO FIBER
PHOTO-DETECTOR
RECEIVER
AMPLIFICATION
& QUANTIZATION
RD+ (RECEIVE DATA)
RD- (RECEIVE DATA)
Rx LOSS OF SIGNAL
VCSEL
TRANSMITTER
LASER
DRIVER &
SAFETY
CIRCUITRY
TX_DISABLE
TD+ (TRANSMIT DATA)
TD- (TRANSMIT DATA)
TX_FAULT
ELECTRICAL INTERFACE
MOD-DEF2 (SDA)
MOD-DEF1 (SCL)
MOD-DEF0
CONTROLLER & MEMORY
OPTICAL INTERFACE
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| AFBR-57F5APZ | 功能描述:光纖發(fā)射器、接收器、收發(fā)器 SFP+ 850nm 16GbE SR MMF RoHS:否 制造商:Omron Electronics 產品:Transmitters 數據速率:3.5 Gbps 波長:850 nm 最大工作溫度: 最小工作溫度: 封裝 / 箱體: 封裝: |
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