Features

multi -rate operation, from 155 Mbps to 4.25 gbps

89 MW power consumption

input Disposal cancellation

High input dynamic range

output disable

cml data output

# 8226; Receive signal strength index (RSSI)

Signal loss detection

polar choice

single 3.3V power supply

surface installation 3-mm × 3-mm 16-pin QFN packaging

compatible with OneT2501Pa and OneT3301PA

Application

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Multi-rate OC3 to OC-48 Fec Sonet/SDH transmission system

1.0625 Gbps, 2.125 GBPS and 4.25 GBPS optical fiber channel receiver

Gigabit Ethernet receiver

Instructions

OneT4201Pa is a multi -function high -speed 3.3V limit amplifier, which is used for multiple fiber applications with a data rate of 4.25Gbps.

This device provides a gain of about 50 decibels to ensure that the full differential output of the input signal is as low as 3 MVP-P.

High input signal dynamic range to ensure a low jitter output signal, even if the input signal swings up to 1200 mega -P -P.

Onet4201Pa provides signal loss detection and receiving signal strength indicator.

This component is encapsulated with a small size 3-mm × 3-mm 16-pin QFN, which is compatible with OneT2501PA and OneT3301PA pin.

The power consumption of a limited amplifier with high power efficiency is usually less than 89MW, which is characterized by working between -40 ° C and 85 ° C.

The block diagram of the block

The simplified box diagram of OneT4201Pa is shown in Figure 1.

这种紧凑的低功耗4.25gbps限幅放大器由一个高速数据通路、一个偏置消除模块、一个信号丢失和RSSI检测模块、一个带隙基准电压和偏置电流产生模块组成Essence

High-speed data path

High-speed data signal through input signal pin din+/din-, which is applied to the data path. Data channels include input levels (with 2 × 50Ω tablet terminals to VCC), three gain levels (typical gains of about 50DB) and a CML output level. The enlarged data output signal can be dough+/dout-to provide 2 × 50- the back terminal on the back of the VCC. The output level also includes the data polar switching function of the output input control and the disable function controlled by the signal control applied to the input pin.

Differentiated to eliminate compensation internal offset voltage, so as to ensure that even for very small input data signals can work normally.

Use built -in filter capacitors, and the low frequency deadline is usually as low as 25 kHz.

For applications that need to be lower -cut frequency, additional external filter capacitors can be connected to COC1/COC2 pins.

Signal loss and RSSI detection

The output signal of the input buffer is monitored by the signal loss and the RSSI detection circuit. In this block, within a wide input voltage range, a linear ratio of the input amplitude is generated. This signal is available at the RSSI output pin.

In addition, the circuit block compares the input signal with the threshold. The threshold can be programmed by connecting the external resistor connected to the TH pin. If the input signal is lower than the specified threshold, the signal of the signal in the LOS pin is lost.

The relationship between LOS Assert Voltage Vast (unit: MVP-P) and the external resistor RTH (unit: k ) connected to Tho pinch can be approximately as follows:

The production of the band voltage and bias

OneT4201Pa restricting the amplifier to power supply from a single 3.3-V ± 10%power supply voltage connected to the VCC pin. This voltage refers to the ground (GND).

The band voltage circuit on the film generates a reference voltage independent of the power supply voltage, which can export the voltage and bias current required by all other internal internal.

Package

For OneT4201Pa, a 3-mm × 3-mm 16-pin QFN package was used with a leading distance of 0.5 mm.

The output of the pin is shown in Figure 2.

Typical features

The typical operating conditions are VCC u003d 3.3 v and TA u003d 25 ° C (unless there are other instructions).

Application information

FIG. 18 shows the OneT4201Pa connected to the AC -lounge interface connection with the data signal source and output load.

Except for the AC coupling capacitor C1 to C4 in the input and output data signal line, the only external component required is the visual distance threshold setting the resistor RTH.If a lower -frequency additional capacitor (COC) is required, an optional deadline (COC) can be used.