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MAX3964CEP Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX3964CEP Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 12 page +3.0V to +5.5V, 125Mbps to 266Mbps Limiting Amplifiers with Loss-of-Signal Detector _______________________________________________________________________________________ 7 sensitivity. The offset-correction circuitry is less sensi- tive to variations of input duty cycle (for example, the 40% to 60% duty cycle encountered in 4B/5B coding) when the input is less than 30mVp-p. Loss-of-Signal Comparator The LOS comparator indicates when the input signal power is below the programmed LOS threshold. To ensure supply and temperature independence, VTH is generated by a 1.2V bandgap reference. The op amp’s external gain-setting resistors (R1 and R2) can be chosen to set VTH between 1.2V and 2.4V. To ensure chatter-free operation, the LOS comparator is designed with approximately 5dB of hysteresis. Squelch The squelch function disables the data outputs by forc- ing OUT- low and OUT+ high during a LOS condition. This function ensures that when there is a loss of sig- nal, the limiting amplifier (and all downstream devices) does not respond to input noise or corrupt data. Connect SQUELCH to GND or leave it unconnected to disable squelch. Connect SQUELCH to VCC to enable data squelching. Applications Information Program the LOS Threshold Figure 2 provides information for selecting the LOS threshold voltage (VTH). If R1 is 100kΩ and if the responsivities of the photodiode and preamplifier are known, then the value of R2 can be selected from Figure 2 to provide LOS assert at the desired input power. Select Capacitors A typical MAX3964/MAX3965/MAX3968 implementation requires four external capacitors (CAZ, CFILTER, and two input coupling capacitors). For all applications up to 266Mbps, Maxim recommends the following: CAZ = 27nF CFILTER = 10nF CIN = 10nF Wire Bonding For high-current density and reliable operation, the MAX3964 series uses gold metalization. Diepad size is 4mils square with a 6mil pitch. Die thickness is 15mils. 0 20 80 60 40 120 100 -40 -36 -34 -38 -32 -30 -28 -26 OPTICAL INPUT POWER AT LOS ASSERT (dBm) 200kV/W 30kV/W 10kV/W 15kV/W 20kV/W 100kV/W Figure 2. LOS Assert Programming Resistor vs. LOS Assert Power (for various PIN-TIA gains ) PART DATA RATE (Mbps) LOS OUTPUTS MAX3964 125 to 155 PECL MAX3965 125 to 155 TTL MAX3968 125 to 266 PECL Selector Guide |
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