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19-2867; Rev 0; 5/03
MAX5888 Evaluation Kit
General Description
The MAX5888 evaluation kit (EV kit) is a fully assembled and tested circuit board that contains all the components necessary to evaluate the performance of the MAX5888 16-bit, 500Msps, current-output, digital-toanalog converter (DAC). The EV kit requires low-voltage differential-signaling (LVDS)-compatible data input, a single-ended clock input, and 3.3V power supplies for simple board operation. The MAX5888 EV kit may also be used to evaluate the MAX5887 (14-bit) and MAX5886 (12-bit) DACs. o LVDS Compatible o SMA Coaxial Connectors for Clock Input and Analog Output o 50 Matched Clock Input and Analog Output Signal Lines o Single-Ended to Differential Clock-Signal Conversion Circuitry o Differential Current Output to Single-Ended Voltage Signal Output Conversion Circuitry o Full-Scale Current Output Configured for 20mA o External 1.25V Reference Source Available o Fully Assembled and Tested o Evaluates the 16-Bit MAX5888, 14-Bit MAX5887, and 12-Bit MAX5886 DACs
Features
o Quick Dynamic Performance Evaluation
Evaluates: MAX5886/MAX5887/MAX5888
Ordering Information
PART MAX5888EVKIT TEMP RANGE 0C to +70C IC PACKAGE 68 QFN-EP*
*EP = Exposed pad.
Component List
DESIGNATION C1 QTY 0 DESCRIPTION Not installed, ceramic capacitor (0603) 0.1F 10%, 10V X5R ceramic capacitors (0402) TDK C1005X5R1A104KT or Taiyo Yuden LMK105BJ104KV Not installed, ceramic capacitors (0805) 47F 10%, 6.3V tantalum capacitors (B) AVX TAJB476K006R or Kemet T494B476K006AS 10F 10%, 10V tantalum capacitors (A) AVX TAJA106K010R or Kemet T494A106K010AS 1F 10%, 10V X5R ceramic capacitors (0603) TDK C1608X5R1A105KT 2 x 20-pin surface-mount headers (0.1in) Samtec TSM-120-02-S-MT 2-pin headers DESIGNATION R1-R4 R5 R6, R8, R9 R7 R10, R11 R12, R13 L1-L4 T1, T3 T2 CLK, OUT OUT+, OUTTP1, TP2, TP3 TP4 U1 U2 None None QTY 4 1 0 1 2 2 4 2 1 2 2 3 1 1 1 5 1 DESCRIPTION 100 0.1% resistors (0603) 100 1% resistor (0603) Not installed, resistors (0603) 2k 1% resistor (0603) 24.9 1% resistors (0402) 0 5% resistors (0402) Ferrite bead cores (4532) Panasonic EXC-CL-4532U1 Transformers Mini-Circuits ADTL1-12 1:1 balun transformer Coilcraft TTWB3010-1 SMA PC-mount vertical connectors Scope probe connectors Tektronix 131-4244-00 (100 quantity) PC test points, black PC test point, red MAX5888EGK (68-pin QFN-EP) 1.25V voltage reference (8-pin SO) Maxim MAX6161AESA Shunts (JU1-JU5) MAX5888 PC board
C2-C15
14
C16, C28
0
C17, C20, C23
3
C18, C21, C24, C26
4
C19, C22, C25, C27
4
J1, J2 JU1-JU5
2 5
________________________________________________________________ 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.
MAX5888 Evaluation Kit Evaluates: MAX5886/MAX5887/MAX5888
Component Suppliers
SUPPLIER AVX Coilcraft Kemet Mini-Circuits Panasonic Samtec Taiyo Yuden TDK PHONE 843-946-0238 847-639-6400 864-963-6300 718-934-4500 714-373-7366 812-944-6733 800-348-2496 847-803-6100 FAX 843-626-3123 847-639-1469 864-963-6322 718-934-7092 714-737-7323 812-948-5047 847-925-0899 847-390-4405 WEBSITE www.avxcorp.com www.coilcraft.com www.kemet.com www.minicircuits.com www.panasonic.com www.samtec.com www.t-yuden.com www.component.tdk.com
Note: Please indicate that you are using the MAX5888 when contacting these component suppliers.
Quick Start
Recommended equipment: * Three 3.3VDC power supplies * Function generator with low phase noise and low jitter for clock input (e.g., HP 8662A) * 16-bit digital pattern generator for LVDS data inputs (e.g., Agilent 81250) * Spectrum analyzer (e.g., Rohde & Schwartz FSEA30) * Voltmeter The MAX5888 EV kit is a fully assembled and tested surface-mount board. Follow the steps below for board operation. Do not turn on power supplies or enable signal generators until all connections are completed: 1) Verify that no shunts are installed across jumpers JU1, JU2 (DAC uses the 1.2V internal voltage reference), and JU3 (DAC in normal operation mode). 2) Verify that a shunt is installed across jumper JU4. 3) Verify that no shunt is installed across jumper JU5. 4) Synchronize the digital pattern generator (HP 81250) to the clock function generator (HP 8662A). 5) Connect the clock function signal generator to the CLK SMA connectors on the EV kit. 6) Verify that the 16-bit digital pattern generator is programmed for LVDS outputs. 7) Connect the digital pattern generator output to the input header connectors J1 and J2 on the EV kit board. The input header pins are labeled for proper connection with the digital pattern generator (i.e., connect the positive rail of bit 0 to the header pin labeled B0P and complementary negative rail to the header pin labeled B0N, etc.).
8) Connect the spectrum analyzer to the OUT SMA connector. 9) Connect a 3.3V power supply to VDD_CK. Connect the ground terminal of this supply to GND_CK. 10) Connect a 3.3V power supply to DVDD. Connect the ground terminal of this supply to DGND. 11) Connect a 3.3V power supply to AVDD. Connect the ground terminal of this supply to AGND. 12) Turn on the three power supplies. 13) With a voltmeter verify that 1.2V is measured at the VREF PC board pad on the EV kit. 14) Enable the clock function generator and the digital pattern generator. Set the clock function generator output power to 10dBm and the frequency (fCLK) to less than or equal to 500MHz. 15) Use the spectrum analyzer to view the MAX5888 output spectrum or view the output waveform using an oscilloscope.
Detailed Description
The MAX5888 EV kit is designed to simplify the evaluation of the MAX5888 16-bit, 500Msps, current-output DAC. The MAX5888 requires LVDS-compatible data inputs, differential clock input signals, a 1.2V reference voltage, and 3.3V power supplies for simple board operation. The MAX5888 EV kit provides header connectors to easily interface with an LVDS pattern generator, circuitry to convert the differential current outputs to a singleended voltage signal, and circuitry to convert a usersupplied single-ended clock signal to a differential clock signal required by the DAC. The EV kit circuit includes different options for supplying a reference voltage to the DAC. The EV kit circuit can operate with a single 3.3V power supply, but also supports the use of
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MAX5888 Evaluation Kit
three separate 3.3V power supplies by dividing the circuit grounds into digital, analog, and digital clock ground planes that improve dynamic performance. The three ground planes are connected together on the back of the PC board. The MAX5888 EV kit features three ways to provide a reference voltage to the DAC: internal, on-board external, and user-supplied external reference. Verify that no shunt is connected across jumper JU1 to use the internal reference. The reference voltage can be measured at the VREF pad on the EV kit. The EV kit circuit is designed with an on-board 1.25V temperature-stable external voltage reference source U2 (MAX6161) that can be used to overdrive the internal reference provided by the MAX5888. Install shunts across jumpers JU1 and JU2 to use the on-board external reference. The user can also supply an external voltage reference in the range of 0.125V to 1.25V by connecting a voltage source to the VREF pad and removing the shunts across jumpers JU1 and JU2. See Table 1 to configure the shunts across jumpers JU1 and JU2 and select the source of the reference voltage.
Evaluates: MAX5886/MAX5887/MAX5888
Power Supplies
The MAX5888 EV kit can operate from a single 3.3V power supply connected to the VDD_CK, DVDD, AVDD input power pads and their respective ground pads for simple board operation. However, three separate 3.3V power supplies are recommended for optimum dynamic performance. The EV kit board layout is divided into three sections: digital, analog, and digital clock circuits. Using separate power supplies for each section reduces noise crosstalk and improves the integrity of the output signal. When using separate power supplies, connect each power supply across the DVDD and DGND PC board pads (digital), across the VDD_CK and GND_CK PC board pads (digital clock), and across the AVDD and AGND PC board pads (analog) on the EV kit.
Full-Scale Output Current
The MAX5888 requires an external resistor to set the full-scale output current. The MAX5888 EV kit full-scale current is set to 20mA with resistor R7. Replace resistor R7 to adjust the full-scale output current. Refer to the Reference Architecture and Operation section in the MAX5888 data sheet to select different values for R7.
LVDS Input Data
The MAX5888 EV kit provides two 0.1in 2 x 20 header connectors (J1 and J2) to interface a 16-bit LVDS pattern generator to the EV kit. The header data pins are labeled on the board with the appropriate data bit designation. Use the labels on the EV kit to match the data bits from the LVDS pattern generator to the corresponding data pins on J1 and J2. The positive rail of a bit is labeled BxP (positive) and the complementary rail is labeled BxN (negative) where x is the bit number.
Differential Output
The MAX5888 complementary current outputs are terminated into differential 50 resistance to generate voltage signals with amplitudes of 1VP-P differential. The positive and negative rails of the differential signal can be sampled at the OUT+ and OUT- probe connectors. The differential signal is converted into a 50 singled-ended signal with balun transformer T2 and can be sampled at the OUT SMA connector. A shunt on jumper JU4 connects the center tap of transformer T2 to AGND, thus enhancing the dynamic performance of the DAC. The single-ended output signal after the transformer generates a -3dBm full-scale output power when terminated into 50. A shunt on jumper JU4 should always be installed for optimum dynamic performance.
Clock Signal
The MAX5888 requires a differential clock input signal with minimal jitter. The EV kit circuit provides singleended to differential conversion circuitry. The user must supply a single-ended clock signal at the CLK SMA connector. The clock signal can be either a sine wave or a square wave. For a sine wave, 2VP-P (10dBm) amplitude is recommended and for a square wave greater than a 0.5VP-P signal is recommended.
Table 1. Reference Voltage Selection
JU1 AND JU2 SHUNT POSITIONS Installed Not installed Not installed VOLTAGE REFERENCE MODE External 1.25V reference (U2) connected to REFIO pin MAX5888 DAC internal 1.2V bandgap reference User-supplied voltage reference at the VREF pad (0.125V to 1.25V)
Reference Voltage Options
The MAX5888 requires a reference voltage to set the full-scale analog signal voltage output. The DAC contains an internal stable on-chip bandgap reference of 1.2V that can be used by decoupling the REFIO pin. The internal reference can be overdriven by an external reference to enhance accuracy and drift performance or for gain control.
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MAX5888 Evaluation Kit Evaluates: MAX5886/MAX5887/MAX5888
Power-Down
The MAX5888 can be powered down or powered up by configuring jumper JU3. In power-down mode, the total power dissipation of the DAC is reduced to less than 1mW. See Table 2 for jumper JU3 configuration.
Table 2. Jumper JU3 (Power-Down)
SHUNT Installed Not installed FUNCTION Power-down mode Normal operation
Segment Shuffling
The segment-shuffling function on the MAX5888 improves the high-frequency spurious-free dynamic range (SFDR) at the cost of a slight increase in the DAC's noise floor. The MAX5888 EV kit provides jumper JU5, which allows the user to enable or disable this function. See Table 3 to configure jumper JU5.
Table 3. Segment-Shuffling Mode (Jumper JU5)
SHUNT Installed SEL0 PIN Connected to DVDD Connected to DGND with internal pulldown resistor SEGMENT-SHUFFLING MODE Enabled
Evaluating the MAX5887 or MAX5886
The MAX5888 EV kit can be used to evaluate the MAX5887 or MAX5886 DACs. The MAX5887 is a 14-bit DAC and the MAX5886 is a 12-bit DAC. Except for the input pins, these DACs are pin-for-pin compatible with the MAX5888. Replace the MAX5888 (U1) with the MAX5887 or the MAX5886 and refer to the respective data sheet to compare the difference in input pins and how to modify the connections between the pattern generator and the EV kit input connectors.
Not installed
Disabled
Board Layout
The MAX5888 EV kit is a four-layer board design optimized for high-speed signals. All high-speed signal lines are routed through 50 impedance-matched transmission lines. The length of these 50 transmission lines is matched to within 40 mils (1mm) to minimize layout-dependent data skew. The board layout separates the analog, digital, and digital clock sections of the circuit for optimum performance.
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DVDD L1
DVDD
DGND J1-38 J1-34 J1-40 J1-36 J1-32 J1 J1-11 J1-30 J1-13 J1-28 DVDD J1-15 J1-26 J1-17 J1-24 J1-19 J1-22
1 C20 47F 2 6.3V C22 1.0F
1 C21 10F 2 10V
J1-3
J1-7
J1-1
J2-2 TP1 J2-37 J2-35 J2-33 58 63 62 60 57 56 55 54 53 68 67 66 65 64 B6P 61 59 B4P B5P B7P B8P B4N B5N B6N B8N B7N B9N B9P DGND DVDD DGND B10N B10P 52 C10 0.1F
J2-39
J2-4
J2-6
J2-8
J2-10 J2-31 J1-21 J1-20 2 B3N J1-23 J1-18 49 J1-25 J1-16 B11P 50
1 B3P B11N 51
J2-12 J2-29 3 B2P 48 J1-27 J1-14 B12N
AVDD
AGND
AVDD
AGND
REFIO
FSADJ
DACREF
N.C.
AVDD
AGND
IOUTN
IOUTP
AVDD
AGND
AVDD
AGND
18 19 21 22 23 24 AVDD 25 26 C7 0.1F C2 0.1F R7 2k 1% C6 0.1F R1 100 0.1% R3 100 0.1% TP4 VREF 6 C27 1.0F JU1 L4 VREF OUTC1 OPEN R9 SHORT 6 VDD_CK VDD_CK L2 1 1 C23 47F 2 6.3V 1 C24 10F 2 10V C25 1.0F JU4 C15 0.1F 1 GND_CK 6 AVDD GND_CK C28 OPEN
20
27
28
29
30 AVDD
31
32
33 AVDD
34
C5 0.1F R2 100 0.1% R4 100 0.1%
C4 0.1F
C3 0.1F AVDD L3 AVDD
VREF 1 AVDD JU2 2 IN U2 N.C. 7 N.C. N.C. 8
N.C.
Figure 1. MAX5888 EV Kit Schematic
4 B2N 47 B12P 5 B1P 46 B13N J1-5 J1-9 J1-29 J1-12 6 B1N 45 B13P J1-31 J1-10 7 B0P 44 B14N J1-33 J1-8 8 B0N 43
J2
J2-14 J2-27
J2-16 J2-25
J2-18 J2-23
J2-20 J2-21
J2-22 J2-19
J2-24 J2-17 9 DVDD 10 VDD_CK J2-9 11 J2-7 J2-5 12 CLKGND J2-3 J2-1 CLKP 14 VDD_CK C12 0.1F VCLK C8 0.1F 15 CLKGND R12 0 16 CLKN GND_CK 13 C16 OPEN C9 0.1F VCLK DVDD 40 C11 0.1F DGND 41 DVDD DGND B15N
U1
B14P
J1-35
J1-6
J2-26 J2-15
J1-37
J1-4
J2-28 J2-13
MAX5888
B15P 42 DVDD J1-39 J1-2
J2-30 J2-11
J2-32
J2-34
J2-36
J2-38
DVDD SEL0 39 JU5 DVDD N.C. 38 JU6 N.C. 37
J2-40
GND_CK
CLK R10 24.9 1%
1 6 T3 R11 4 GND_CK 24.9 1% C13 0.1F R13 0 PD JU3 GND_CK 17
TP2 2
1
N.C.
36
GND_CK
3
N.C.
35
GND_CK
C19 1.0F
1 C18 10F 10V 2
1 2 AGND R5 100 1% R6 OPEN R8 SHORT T1 4 OUT+
C17 47F 6.3V
C14 0.1F 3 N.C. 5 C26 10F 10V OUT
MAX6161
4 GND GND
3 5 4 T2 1 3 2 TP3 OUT 2 GND_CK
Evaluates: MAX5886/MAX5887/MAX5888
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GND_CK
MAX5888 Evaluation Kit
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MAX5888 Evaluation Kit Evaluates: MAX5886/MAX5887/MAX5888
Figure 2. MAX5888 EV Kit Component Placement Guide-- Component Side
Figure 3. MAX5888 EV Kit PC Board Layout--Component Side
Figure 4. MAX5888 EV Kit PC Board Layout--Ground Planes
Figure 5. MAX5888 EV Kit PC Board Layout--Power Planes
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MAX5888 Evaluation Kit Evaluates: MAX5886/MAX5887/MAX5888
Figure 6. MAX5888 EV Kit PC Board Layout--Solder Side
Figure 7. MAX5888 EV Kit Component Placement Guide-- 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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7 (c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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