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2.5 / 3.3V, 3.2Gbps LVDS Multiplexer with Internal Termination

SY89542 / 3 / 4 / 5 / 6 / 7 Evaluation Board

2.5 / 3.3V, 3.2Gbps LVDS Multiplexer with Internal Termination
SY89542 / 3 / 4 / 5 / 6 / 7 Evaluation Board
General Description
Features
· SY89542 / 3 / 4 / 5 / 6 / 7U LVDS multiplexer with internal termination · Single +2.5V or +3.3V power supply · AC-coupled input and output configuration for ease of use · Fully assembled and tested
Related Documentation
· SY89542U, 2.5V, 3.2Gbps Dual Differential 2:1 LVDS Multiplexer with Internal Termination Data Sheet · SY89543L, 3.3V, 3.2Gbps Dual Differential 2:1 LVDS Multiplexer with Internal Termination Data Sheet · SY89544U, 2.5V, 3.2Gbps Differential 4:1 LVDS Multiplexer with Internal Termination Data Sheet · SY89545L, 3.3V, 3.2Gbps Differential 4:1 LVDS Multiplexer with Internal Termination Data Sheet · SY89546U, 2.5V, 3.2Gbps Differential 4:1 LVDS Multiplexer with 1:2 Fanout and Internal Termination Data Sheet · SY89547L, 2.5V, 3.2Gbps Differential 2:1 LVDS Multiplexer with 1:2 Fanout Internal Termination Data Sheet
Evaluation Board
March 2005
M9999-031705 hbwhelp@micrel.com or (408) 955-1690
Micrel
SY89542 / 3 / 4 / 5 / 6 / 7 Evaluation Board The high-speed input channels are brought out to SMA connectors through matched length AC-coupled differential strip-line traces. The DC-operating point is set by the VT pins, which are brought out to a banana jack. The outputs are brought out to SMA connectors through matched length AC-coupled differential stripline traces, which allow the board to interface directly with 50-to-ground lab equipment. The LVTTL / LVCMOS control input SEL pins are controlled by a dipswitch, which is used to select the channel inputs.
Evaluation Board Description
March 2005
M9999-031705 hbwhelp@micrel.com or (408) 955-1690
Micrel
SY89542 / 3 / 4 / 5 / 6 / 7 Evaluation Board
Evaluation Board
SY8954x Evaluation Board
I / O AC-Coupled Input / AC-Coupled Output
VCC 2.5V / 3.3V
GND 0V
VEE 0V
C13-C16 0.1µF
Table 1. SY8954x Configuration
Note: 1. SY89544 / 5: pins 14 and 15 are no connects.
March 2005
M9999-031705 hbwhelp@micrel.com or (408) 955-1690
Micrel
SY89542 / 3 / 4 / 5 / 6 / 7 Evaluation Board
AC-Coupled Evaluation Board Setup
Setting up the SY8954x AC-Coupled Evaluation Board The following steps describe the procedure for setting up the evaluation board: 1. Set VCC to 2.5V or 3.3V, and GND and VEE to 0V, and turn off the supply. 2. Set the VT banana jack to VCC-1.3V. 3. Set the dipswitch to select the desired input channel, see Table 2 below. 4. Using a differential signal source, set the amplitude to 400mV (single-ended) or 800mV (differential). Set the offset to a positive value, the value of the offset is not critical, since the AC-coupled inputs will automatically bias to the VT voltage. 5. Turn off or disable the outputs of the signal source. 6. Using equal length 50 impedance coaxial cables, connect the single source to the inputs on the evaluation board. 7. Using equal length 50 impedance coaxial cables, connect the outputs of the evaluation board to an oscilloscope or other lab equipment with internal 50 termination. 8. Enable the signal source and monitor the outputs. IN0 0 1 X X IN1 X X 0 1 SEL 0 0 1 1 Q 0 1 0 1 / Q 1 X 1 0
Evaluation Board Layout
PC Board Layout The evaluation boards are constructed with Rogers 4003 material, coplanar in design, and fabricated to minimize noise, achieve high bandwidth and minimize crosstalk.
L1 L2 L3 L4 GND and Signal GND VCC GND
Table 3. Layer Stack
Table 2. Truth Table
March 2005
M9999-031705 hbwhelp@micrel.com or (408) 955-1690
Micrel
SY89542 / 3 / 4 / 5 / 6 / 7 Evaluation Board
Bill of Materials
Item C1-C9, C12- C16(1) C10, C11 R5, R6 J1 J2 J3 J4 SMA-SMA10 U1 Part Number VJ0402Y104KXXAT CRCW0402000Z CRCW04023001F 111-0703-001 111-0703-001 111-0703-001 111-0703-001 142-0701-851 SY89854U Manufacturer Vishay
Vishay(2) Vishay(2) Johnson Components(3) Johnson Components(3) Johnson Components(3) Digi-Key(4) Johnson Components(3) Micrel(5)
1:4 Low Power, LVPECL Fanout Buffer
Notes: 1. SY89544 / 5 pins 14 and 15 are No connects. 2. 3. 4. 5. Vishay: www.vishay.com Johnson Components: www.johnsoncomponents.com Digi-key www.digikey.com. Micrel, Inc.: www.micrel.com.
March 2005
M9999-031705 hbwhelp@micrel.com or (408) 955-1690
Micrel
SY89542 / 3 / 4 / 5 / 6 / 7 Evaluation Board
Micrel Cross Reference
Application Hints and Notes
HBW Support
Hotline: 408-955-1690 12. Email Support: HBWHelp@micrel.com
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http: / www.micrel.com
March 2005
M9999-031705 hbwhelp@micrel.com or (408) 955-1690