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MAX4890 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX4890 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 17 page Analog Signal Levels The on-resistance of the MAX4890/MAX4891/MAX4892 is very low and stable as the analog input signals are swept from ground to V+ (see the Typical Operating Characteristics). The switches are bidirectional, allow- ing A_ and _B_ to be configured as either inputs or out- puts. ESD Protection The MAX4890/MAX4891/MAX4892 are characterized using the Human Body Model for ±2kV of ESD protec- tion. Figure 8 shows the Human Body Model, and Figure 9 shows the current waveform the Human Body Model generates when discharged into a low-impedance load. This model consists of a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the test device through a 1.5kΩ resistor. Applications Information Typical Operating Circuit The Typical Operating Circuit depicts the MAX4890/ MAX4891/MAX4892 in a 10/100/1000 Base-T docking station application. Line-Card Redundancy (Ethernet T3/E3) Figure 10 shows the MAX4890/MAX4891/MAX4892 in a line-card redundancy configuration. Power-Supply Sequencing and Overvoltage Protection Caution: Do not exceed the absolute maximum ratings. Stresses beyond the listed ratings may cause perma- nent damage to the device. Proper power-supply sequencing is recommended for all CMOS devices. Always apply V+ before applying analog signals, especially if the analog signal is not current limited. Layout High-speed switches require proper layout and design procedures for optimum performance. Keep design- controlled-impedance printed circuit board traces as short as possible. Ensure that bypass capacitors are as close to the device as possible. Use large ground planes where possible. 10/100/1000 Base-T Ethernet LAN Switch 10 ______________________________________________________________________________________ Figure 4. Differential Crosstalk 1 3 MINI CKT BALUN 6 4 NETWORK ANALYZER R4 49.9 Ω R3 49.9 Ω 1 3 MINI CKT BALUN 6 4 R4 49.9 Ω R3 49.9 Ω 50 Ω TRACE 50:100 NETWORK ANALYZER 50 Ω TRACE 5 50:100 CB5 CB4 50 Ω TRACE 50 Ω TRACE A4 7 A5 8 AB1 22 5B1 21 6B1 18 7B1 17 A6 9 A7 10 DIFFERENTIAL CROSSTALK TRANSMIT CKT DIFFERENTIAL CROSSTALK RECEIVE CKT MAX4892 36-TQFN |
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