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19-2160; Rev 0; 9/01
MAX3754/MAX3755 Evaluation Kits
General Description
The MAX3754/MAX3755 evaluation kits (EV kits) simplify evaluation of the MAX3754/MAX3755 quad-port bypass circuit. The EV kits enable testing of all the devices' functions. SMA connectors and 50 terminations are provided for all input and output ports to facilitate connection to standard high-speed test equipment. The MAX3754/MAX3755 EV kits are fully assembled and tested.
Features
o SMA Connectors for All High-Speed Inputs and Outputs o On-Board 75 to 50 Impedance-Conversion Networks for Interface with Standard Test Equipment (MAX3754) o Loss-of-Lock LED Indicator o Jumpers to Enable Testing of All Functions o Fully Assembled and Tested
Evaluate: MAX3754/MAX3755
Component Suppliers
SUPPLIER AVX Coilcraft Murata PHONE 843-946-0238 847-639-6400 770-436-1300 FAX 843-626-3123 847-639-1469 770-436-3030 PART MAX3754EVKIT MAX3755EVKIT
Ordering Information
TEMP. RANGE 0C to +70C 0C to +70C IC PACKAGE 48 TQFP-EP* 48 TQFP-EP*
*Exposed paddle
Note: Please indicate that you are using the MAX3754/MAX3755 when contacting these component suppliers.
Component List MAX3754
DESIGNATION C1-C24, C28, C29, C30 C25 C26 C27 D1 J1-J24 J25 J26 J27-J33 L1 QTY 27 1 1 1 1 24 1 1 7 1 DESCRIPTION 0.1F 10% Murata ceramic capacitors (0805) 0.047F 10% Murata ceramic capacitor (0603) 33F tantalum capacitor (1206) AVX TAJB335K016 2.2F 10% Murata ceramic capacitor (1206) Red LED, T-1 package SMA connectors (edge-mount) Note: Cut center pin to approximately 1/16in length. Test point 2-pin header (0.1in centers) 3-pin headers (0.1in centers) 56nH inductor (0805) Coilcraft 0805HT-56NTKBC DESIGNATION R1, R2, R4, R5, R7, R8, R10, R11, R13, R14, R16, R17, R19, R20, R22, R23, R25, R26, R28, R29 R3, R6, R9, R12, R15, R18, R21, R24, R27, R30 R31 U1 None None None QTY DESCRIPTION
20
43.2 1% resistors (0402)
10 1 1 7 1 1
178 1% resistors (0402) 150 1% resistor (0603) MAX3754CCM 48-pin TQFP-EP Shunts MAX3754/MAX3755 data sheet MAX3754/MAX3755 EV kit circuit board, Rev A
________________________________________________________________ Maxim Integrated Products
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For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX3754/MAX3755 Evaluation Kits Evaluate: MAX3754/MAX3755
Component List MAX3755
DESIGNATION C1-C24, C28, C29, C30 C25 C26 C27 D1 J1-J24 J25 J26 J27-J33 QTY 27 1 1 1 1 24 1 1 7 DESCRIPTION 0.1F 10% Murata ceramic capacitors (0805) 0.047F 10% Murata ceramic capacitor (0603) 33F tantalum capacitor (1206) AVX TAJB335K016 2.2F 10% Murata ceramic capacitor (1206) Red LED, T-1 package SMA connectors (edge-mount) Note: Cut center pin to approximately 1/16in length. Test point 2-pin header (0.1in centers) 3-pin headers (0.1in centers) DESIGNATION L1 R1, R2, R4, R5, R7, R8, R10, R11, R13, R14, R16, R17, R19, R20, R22, R23, R25, R26, R28, R29 R3, R6, R9, R12, R15, R18, R21, R24, R27, R30 R31 U1 None None None QTY 1 DESCRIPTION 56nH inductor (0805) Coilcraft 0805HT-56NTKBC
20
0 1% resistors (0402)
10 1 1 7 1 1
Open 150 1% resistor (0402) MAX3755CCM 48-pin TQFP-EP Shunts MAX3754/MAX3755 data sheet MAX3754/MAX3755 EV kit circuit board, Rev A
Quick Start
1) Connect a differential, serial data signal source to the input quad-port bypass circuit (PBC) at IN. Set the differential input signal amplitude to 500mVp-p. Set the data rate of the input signal to 2.125Gbps or 1.0625Gbps. 2) Select the operational data rate of the device using J33 to connect RATESEL to GND or VCC. Shunt pins 2 and 3 (VCC) to select 2.125Gbps operation. Shunt pins 1 (GND) and 2 to select 1.0625Gbps operation (Table 1). 3) Connect OUT+ and OUT- to a 50 oscilloscope using matched 50 cables. 4) Connect a +3.3V power supply to the VCC pin on J26, and connect ground to the GND pin on J26. 5) Connect CLKEN, SEL1, SEL2, SEL3, and SEL4 to ground by shunting pins 1 and 2 on J27 through J31 (Table 1). 6) Connect CDREN to VCC by shunting pins 2 and 3 on J32 (Table 1). 7) The output differential voltage signal will be between 1Vp-p and 1.8Vp-p. High-speed sampling oscilloscopes are not capable of displaying signals of this magnitude. Use 14dB attenuators on all outputs to ensure the waveforms are not visually distorted. The L-port outputs of the MAX3754 are already attenuated, so a 6dB attenuator can be substituted on these outputs.
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Detailed Description
The MAX3754/MAX3755 EV kits simplify evaluation of the MAX3754/MAX3755 quad-port bypass circuits. The EV kits operate from a single +3.3V power supply and come complete with all the external components necessary to interface with 50 test equipment.
Connections
SMA connectors are provided for all high-speed inputs (IN, LIN1, LIN2, LIN3, and LIN4) and outputs (OUT, LOUT1, LOUT2, LOUT3, and LOUT4). The L-port inputs and outputs are AC-coupled through a 50 to 75 resistive impedance-conversion network on the MAX3754 EV kit (see Impedance-Conversion Networks). The L-port inputs and outputs of the MAX3755 are ACcoupled to 50 transmission lines. SMA connectors are also provided for TEST1 and TEST2, I/O connections for a PC board test strip (see PC Board Test Strip). Power-supply connections (VCC and ground) are provided through a 2-pin header (J26). A test point is provided to monitor the LOCK output if visual inspection of the onboard LED is not possible. The control inputs (CLKEN, SEL1, SEL2, SEL3, SEL4, CDREN, and RATESEL) are connected to individual three-pin headers that allow the selection of VCC or ground with a shunt.
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MAX3754/MAX3755 Evaluation Kits
Impedance Conversion Networks
The MAX3754 high-speed L-port inputs and outputs (LIN_ and LOUT_) are connected to SMA connectors through a 75 to 50 impedance-conversion network. These networks allow the MAX3754 to see 75, while the 50 transmission lines see 50 when looking into the inputs and outputs. The impedance conversion provides a convenient interface between the 75 inputs and outputs of the MAX3754 IC and 50 test equipment. A side effect of the impedance-conversion network is signal attenuation. The input voltage at the IC is 0.64 times the signal injected into the EV kit. The measured output voltage is 0.43 times the output voltage from the IC. For example, a differential signal of 600mV applied to the input of the EV kit produces an input signal of 384mV (= 0.64 600mV) across IN. A differential signal of 600mV observed after the output impedanceconversion network implies the actual output is 1400mV (= 600mV/0.43).
PC Board Test Strip
The PC board attenuates high frequencies, causing deterministic jitter and other measurement errors. A test strip is provided to measure these effects independently for calibrating data measured from the MAX3754/MAX3755. The test loop consists of two pairs of SMA connectors (TEST1, TEST2) that are AC-coupled to a 50 microstrip transmission line. The test strip is laid out to allow modeling of the MAX3754/MAX3755 L-port input and output paths. All testloop microstrip line lengths are equivalent to the corresponding lengths that connect to the MAX3754/MAX3755 high-speed L-port inputs and outputs. The test loop allows measurement of the electrical effects of the EV kit PC board and impedance-conversion networks of the L-ports independent of the MAX3754/MAX3755 IC.
Evaluate: MAX3754/MAX3755
Loss-of-Lock Monitor
The MAX3754/MAX3755 EV kits are provided with a lossof-lock monitor LED. The LED is illuminated when the internal phase-locked loop loses lock on the incoming signal. This output should not be used as a loss-of-signal indicator. The MAX3754/MAX3755 needs edge transitions to guarantee a valid signal level of this output.
Table 1. Functional Adjustments and Controls
CONTROL J27 J28 J29 J30 J31 J32 J33 NAME CLKEN SEL1 SEL2 SEL3 SEL4 CDREN RATESEL FUNCTION SHUNT POSITIONS 1 AND 2 Disable clock output at LOUT1 (normal operating mode). Port 1 bypass mode. Port 2 bypass mode. Port 3 bypass mode. Port 4 bypass mode. Disable CDR. 1.0625Gbps Operation. SHUNT POSITIONS 2 AND 3 Enable clock output at LOUT1 (test mode) when the CDR is enabled. Port 1 enabled. Port 2 enabled. Port 3 enabled. Port 4 enabled. Enable CDR. 2.125Gbps Operation.
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MAX3754/MAX3755 Evaluation Kits Evaluate: MAX3754/MAX3755
C21 0.1F R27 178 R25 43.2 R28 43.2
J21
C23 0.1F R30 178
J23
J22
C22 0.1F
R26 43.2
R29 43.2
C24 0.1F
J24 C19 0.1F R24 178 C20 0.1F
J9
C9 0.1F R12 C10 178 0.1F
R10 43.2
R22 43.2
J19
R11 43.2
R23 43.2
J10
J20
J7
C7 0.1F R9 C8 178 0.1F
R7 43.2
R19 43.2
C17 0.1F R21 178 C18 0.1F
J17
R8 43.2 48 LOUT2+ 1 47 LOUT246 GND 45 LIN2+ 44 LIN243 GND 42 GND 41 LOUT3+ 40 LOUT339 GND 38 LIN3+ 39 LIN3-
R20 43.2
J8
J18
J6
C5 0.1F R6 C6 178 0.1F
R4 43.2
GND
GND
36
R16 43.2
C15 0.1F R18 178 C16 0.1F
2 R5 43.2 3 4 C3 0.1F R3 C4 178 0.1F R1 43.2 5 R2 43.2 6 7
LIN1LIN1+ GND
LOUT4+ LOUT4GND
35 34 33 R13 43.2 32 31 30 R14 43.2 R15 178 C14 0.1F C13 0.1F R17 43.2
J15
J5
J16
J3
LOUT1LOUT1+ GND
LIN4+
J13
U1 MAX3754
LIN4GND
J4
J14
8 GND C1 0.1F 9 10 11
GND
29 C11 0.1F
J1
ININ+ GND RATESEL
OUTOUT+ GND
28 27 26
J11
J2
C2 0.1F
C12 0.1F
J12
12
CDREN
CLKEN SEL1 SEL2 SEL3 SEL4 CF+ VCC VCC VCC CF-
LOCK VCC
25 J25 LOCK
13
14
C25 15 0.047F
16
17
18
19
20
21
22
23
24
R31 150
D1 J27 J28 J29 J30 J31 J32 L1 56nH VCC J26 GND C26 33F C27 2.2F C28 0.1F C29 0.1F C30 0.1F J33
Figure 1. MAX3754 Evaluation Kit Schematic 4 _______________________________________________________________________________________
MAX3754/MAX3755 Evaluation Kits Evaluate: MAX3754/MAX3755
C21 0.1F R27 OPEN R25 0 R28 0 C23 0.1F R30 OPEN
J21
J23
J22
C22 0.1F
R26 0
R29 0
C24 0.1F
J24 C19 0.1F R24 OPEN C20 0.1F
J9
C9 0.1F R12 C10 OPEN 0.1F
R10 0
R22 0
J19
R11 0
R23 0
J10
J20
J7
C7 0.1F R9 C8 OPEN 0.1F
R7 0
R19 0
C17 0.1F R21 OPEN C18 0.1F
J17
R8 0 48 LOUT2+ 1 47 LOUT246 GND 45 LIN2+ 44 LIN243 GND 42 GND 41 LOUT3+ 40 LOUT339 GND 38 LIN3+ 39 LIN3-
R20 0
J8
J18
J6
C5 0.1F R6 C6 OPEN 0.1F
R4 0
GND
GND
36
R16 0
C15 0.1F R18 OPEN C16 0.1F
2 R5 0 3 4 C3 0.1F R3 C4 OPEN 0.1F R1 0 5 R2 0 6 7
LIN1LIN1+ GND
LOUT4+ LOUT4GND
35 34 33 R13 0 32 31 30 R14 0 R15 OPEN C14 0.1F C13 0.1F R17 0
J15
J5
J16
J3
LOUT1LOUT1+ GND
LIN4+
J13
U1 MAX3755
LIN4GND
J4
J14
8 GND C1 0.1F 9 10 11
GND
29 C11 0.1F
J1
ININ+ GND RATESEL
OUTOUT+ GND
28 27 26
J11
J2
C2 0.1F
C12 0.1F
J12
12
CDREN
CLKEN SEL1 SEL2 SEL3 SEL4 CF+ VCC VCC VCC CF-
LOCK VCC
25 J25 LOCK
13
14
C25 15 0.047F
16
17
18
19
20
21
22
23
24
R31 150
D1 J27 J28 J29 J30 J31 J32 L1 56nH VCC J26 GND C26 33F C27 2.2F C28 0.1F C29 0.1F C30 0.1F J33
Figure 2. MAX3755 Evaluation Kit Schematic _______________________________________________________________________________________ 5
MAX3754/MAX3755 Evaluation Kits Evaluate: MAX3754/MAX3755
1.0"
Figure 3. MAX3754/MAX3755 Evaluation Kit Component Placement Guide--Component Side
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MAX3754/MAX3755 Evaluation Kits Evaluate: MAX3754/MAX3755
1.0"
Figure 4. MAX3754/MAX3755 Evaluation Kit PC Board Layout--Component Side
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MAX3754/MAX3755 Evaluation Kits Evaluate: MAX3754/MAX3755
1.0"
Figure 5. MAX3754/MAX3755 Evaluation Kit PC Board Layout--Ground Plane
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MAX3754/MAX3755 Evaluation Kits Evaluate: MAX3754/MAX3755
1.0"
Figure 6. MAX3754/MAX3755 Evaluation Kit PC Board Layout--Power Plane
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MAX3754/MAX3755 Evaluation Kits Evaluate: MAX3754/MAX3755
1.0"
Figure 7. MAX3754/MAX3755 Evaluation Kit PC Board Layout--Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
10 ____________________ Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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