ONET1130EC datasheet(53/60 Pages) TI1

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ONET1130EC

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SLLSEJ3A – JUNE 2015 – REVISED JULY 2015

9.2.4.1 Design Requirements

Table 31. Design Parameters

PARAMETER

VALUE

Supply voltage

2.5 V

Transmitter input voltage

100 mVpp to 1000 mVpp differential

Transmitter output voltage

0.5 Vpp to 2 Vpp single-ended

Receiver input voltage

6 mVpp to 800 mVpp differential

Receiver output voltage

300 mVpp to 900 mVpp differential

9.2.4.2 Detailed Design Procedure

In the transmitter single-ended mode of operation, the output driver is intended to be used with a single-ended

driven Electroabsorptive Modulated Laser (EML) TOSA. On the input side, the TXIN+ and TXIN– pins are

required to be AC coupled to the signal from the host system and the input voltage should be between 100mVpp

and 1000mVpp differential. On the output side, it is recommended that the TXOUT+ pin is AC coupled to the

modulator input and the TXOUT– pin can be left unterminated or terminated to VCC through a 50

Ω resistor. A

bias-T from VCC to the TXOUT+ pin is required to supply sufficient headroom voltage for the output driver

transistors. It is recommended that the inductance in the bias-T have low DC resistance to limit the DC voltage

drop and maximize the voltage supplied to the TXOUT+ pin. If the voltage on this pins drops below

approximately 2.1V then the output rise and fall times can be adversely affected.

The receiver inputs, RXIN+ and RXIN–, are AC coupled to the output of ROSA and the input voltage should be

between 6mVpp and 800mVpp differential. The receiver outputs, RXOUT+ and RXOUT–, are AC coupled to the

receiver input of the host system.

9.2.4.3 Application Curves

Figure 72. Single-Ended Mode Transmitter Output Eye Diagram

10 Power Supply Recommendations

The ONET1130EC is designed to operate from an input supply voltage range between 2.37 V and 2.63 V. To

reduce transmitter and receiver power supply coupling, as well as digital coupling into the analog circuitry, there

are separate supplies for the transmitter, receiver and digital circuitry. VCC_TX is used to supply power to the

transmitter, VCC_RX is used to supply power to the receiver and VDD is used to supply power to the digital

block. Power supply decoupling capacitors should be placed as close as possibly to the respective power supply

pins.

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