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MAX3785ITT Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX3785ITT Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 8 page Functional Description The MAX3785 6.25Gbps PC board equalizer consists of an equalizer, limiting amplifier, offset driver, and off- set cancellation circuit (see Figure 2). The equalizer block compensates for the attenuation caused by the PC board. The limiting amplifier squares up the signal at the output of the equalizer block. The offset cancella- tion circuit corrects for internal offset in the limiting amplifier to minimize pulse-width distortion. This intro- duces a low-frequency cutoff. The data must achieve a 50% mark/space ratio in less than 100µs. The specified minimum differential input must be maintained to avoid oscillation. Input and Output Structures An equivalent DC input circuit is shown in Figure 3. It has an equivalent DC differential input resistance of 100 Ω. The output buffer is implemented using current- mode logic (CML), as shown in Figure 4. Package Description The chip-scale package (UCSP) has a bump pitch of 0.5mm (19.7 mils) and a bump diameter of 0.3mm (12 mils). Lay out the solder pad spacing on 0.5mm (19.7 mils), a pad size of 0.25mm (10 mils) and a solder mask opening of 0.33mm (13 mils). Round or square pads are permissible. For detailed information on UCSP layout and handling, go to Maxim’s website, www.maxim-ic.com. The enclosed package description was accurate at the time of publication. For the MAX3785, all the balls shown in row B of the drawing are unpopulated. See the Package Information section for the latest package information. 6.25Gbps, 1.8V PC Board Equalizer 6 _______________________________________________________________________________________ PIN NAME FUNCTION (MAX3785UBL) A1 IN- Negative Data Input, CML A2 GND Supply Ground A3 OUT- Negative Data Output, CML C1 IN+ Positive Data Input, CML C2 VCC Supply Voltage C3 OUT+ Positive Data Input, CML MAX3785UBL Pin Description PIN NAME FUNCTION (MAX3785UTT) 1 IN- Negative Data Input (CML) 2 GND Supply Ground 3 OUT- Negative Data Output (CML) 4 OUT+ Positive Data Output (CML) 5 VCC Supply Voltage 6 IN+ Positive Data Input (CML) — EP Exposed Pad MAX3785UTT Pin Description Figure 2. Functional Diagram of the MAX3785 EQUALIZER OFFSET ADJUST LIMITER OUTPUT BUFFER MAX3785 OUT+ OUT- IN+ IN- |
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