General Description
The MAX5885 evaluation kit (EV kit) is a fully assembled
and tested circuit board that contains all the compo-
nents necessary to evaluate the performance of the
MAX5885 16-bit parallel input, 200Msps, current-out-
put, digital-to-analog converter (DAC). The EV kit oper-
ates with CMOS-compatible data inputs, a single-
ended clock input, and 3.3V power supplies for simple
board operation.
The MAX5885 EV kit can also be used to evaluate the
MAX5884 (14 bit) and the MAX5883 (12 bit).
Features
♦Fast Evaluation and Performance Testing
♦CMOS Compatible
♦SMA Coaxial Connectors for Clock Input and
Analog Output
♦50ΩMatched Clock Input and Analog Output
Signal Lines
♦Single-Ended to Differential Clock Signal
Conversion Circuitry
♦Differential Current Output to Single-Ended
Voltage Signal Output Conversion Circuitry
♦Full-Scale Current Output Configured for 20mA
♦External 1.25V Reference Source Available
♦Fully Assembled and Tested
♦Also Evaluates the 14-Bit MAX5884 and 12-Bit
MAX5883
Evaluates: MAX5883/MAX5884/MAX5885
MAX5885 Evaluation Kit
________________________________________________________________ Maxim Integrated Products 1
19-2978; Rev 0; 9/03
Component List
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.
Ordering Information
PART TEMP RANGE IC PACKAGE
MAX5885EVKIT 0°C to +70°C 48 QFN-EP*
DESIGNATION QTY DESCRIPTION
C1 0 Not installed, ceramic capacitor
(0603)
C2–C13 12
0.1µF ±10%, 10V X5R ceramic
capacitors (0402)
TDK C1005X5R1A104K or
Taiyo Yuden LMK105BJ104KV
C14, C17,
C20, C25 4
47µF ±10%, 6.3V tantalum
capacitors (B)
AVX TAJB476K006R or
Kemet T494B476K006AS
C15, C18,
C21, C26 4
10µF ±10%, 10V tantalum
capacitors (A)
AVX TAJA106K010R or
Kemet T494A106K010AS
C16, C19,
C22, C27 4
1µF ±10%, 10V X5R ceramic
capacitors (0603)
TDK C1608X5R1A105K
C23, C24 0 Not installed, ceramic capacitor
(0805)
CLK, OUT 2 SMA PC-mount vertical connectors
IOUTP, IOUTN 2 Scope probe jacks
J1 1 2 x 20 pin surface-mount header
Samtec TSM-120-02-S-MT
DESIGNATION QTY DESCRIPTION
JU1 1 3-pin header
JU2–JU5 4 2-pin headers
L1–L4 4 Chip bead core inductors
Panasonic EXC-CL-4532U1
R1, R2 2 49.9Ω ±0.1% resistors (0603)
IRC PFC-W0603R-03-49R9-B
R3 1 100Ω ±1% resistor (0603)
R4, R5, R6 0 Not installed, resistors (0603)
R7 1 2kΩ ±1% resistor (0603)
R8–R26 19 0Ω ±5% resistors (0402)
R27, R28 2 24.9Ω ±1% resistors (0402)
R29–R45 0 Not installed, resistors (0402)
T1, T3 2 Transformers
Mini-Circuits ADTL1-12
T2 1 Transformer
Coilcraft TTWB3010-1
TP1–TP4 4 PC test points, black
TP5 1 PC test point, red
U1 1 MAX5885EGM (48-pin QFN-EP)
U2 1 1.25V voltage reference (8-pin SO)
Maxim MAX6161AESA
None 5 Shunts (JU1–JU5)
None 1 MAX5885 PC board
*EP = Exposed pad.
Evaluates: MAX5883/MAX5884/MAX5885
MAX5885 Evaluation Kit
2 _______________________________________________________________________________________
Quick Start
Recommended Equipment
•Three 3.3V power supplies
•Function generator with low phase noise and low jit-
ter for clock input (e.g., HP 8662A)
•16-bit digital pattern generator for data inputs (e.g.,
Tektronix DG2020A)
•Spectrum analyzer (e.g., HP 8560E)
•Voltmeter
The MAX5885 EV kit is a fully assembled and tested sur-
face-mount board. Follow the steps below for board
operation. Do not turn on power supplies or enable
signal generators until all connections are completed.
Procedure
1) Verify that a shunt is installed across pins 2 and 3
of jumper JU1 (DAC enabled).
2) Verify that shunts are not installed across jumpers
JU2, JU4, and JU5 (DAC uses the 1.2V on-chip
voltage reference).
3) Verify that a shunt is installed across jumper JU3.
4) Synchronize the digital pattern generator
(DG2020A) with 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 valid CMOS output voltage levels.
7) Connect the digital signal generator output to the
J1 input header connector on the EV kit board. The
input header pins are labeled for proper connec-
tion with the digital pattern generator (i.e., connect
bit 0 to the header pin labeled B0, connect bit 1 to
the header pin labeled B1, etc.).
8) Connect the spectrum analyzer to the OUT SMA
connector.
9) Connect a 3.3V power supply to the V_CLK pad.
Connect the ground terminal of this supply to the
CLKGND pad.
10) Connect a 3.3V power supply to the D_VDD pad.
Connect the ground terminal of this supply to the
DGND pad.
11) Connect a 3.3V power supply to the A_VDD pad.
Connect the ground terminal of this supply to the
AGND pad.
12) Turn on the three power supplies.
13) With a voltmeter, verify that 1.2V is measured at the
V_REF PC board pad on the EV kit.
14) Enable the clock function generator (HP 8662A)
and the digital pattern generator. Set the clock
function generator output power to 10dBm and the
frequency (fCLK) to less than or equal to 200MHz.
15) Use the spectrum analyzer to view the MAX5885
output spectrum or view the output waveform using
an oscilloscope.
Detailed Description
The MAX5885 EV kit is designed to simplify the evalua-
tion of the MAX5885 16-bit, 200Msps, current-output
DAC. The MAX5885 operates with CMOS-compatible
Component Suppliers
SUPPLIER PHONE FAX WEBSITE
AVX 843-946-0238 843-626-3123 www.avxcorp.com
Coilcraft 847-639-6400 847-639-1469 www.coilcraft.com
IRC 361-992-7900 361-992-3377 www.irctt.com
Kemet 864-963-6300 864-963-6322 www.kemet.com
Mini-Circuits 718-934-4500 718-934-7092 www.minicircuits.com
Panasonic 714-373-7366 714-737-7323 www.panasonic.com
Samtec 800-726-8329 812-948-5047 www.samtec.com
Taiyo Yuden 800-348-2496 847-925-0899 www.t-yuden.com
TDK 847- 803-6100 847-390-4405 www.component.tdk.com
Note: Please indicate that you are using the MAX5885 when contacting these component suppliers.
data inputs, a differential clock input signal, an internal
1.2V reference voltage, and a 3.3V power supply for
simple board operation.
The MAX5885 EV kit provides a header connector to
easily interface with a pattern generator, circuitry that
converts the differential current output to a single-
ended voltage signal, and circuitry to convert a user-
supplied single-ended clock signal to a differential
clock signal required by the MAX5885. The EV kit cir-
cuit includes different options for supplying a reference
voltage to the DAC. The EV kit can operate with a sin-
gle 3.3V power supply but also supports the use of
three separate 3.3V power supplies by dividing the cir-
cuit into digital, analog, and digital clock planes that
improve dynamic performance.
Power Supplies
The MAX5885 EV kit can operate from a single 3.3V
power supply connected to the D_VDD, A_VDD, and
V_CLK input power pads and their respective ground
pads for simple board operation. However, three sepa-
rate 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.
Using separate power supplies for each section reduces
crosstalk noise and improves the integrity of the output
signal. When using separate power supplies, connect
each power supply across the D_VDD and DGND PC
board pads (digital), across the V_CLK and CLKGND PC
board pads (digital clock), and across the A_VDD and
AGND PC board pads (analog) on the EV kit.
CMOS Input Data
The MAX5885 EV kit provides a 0.1in 2 x 20 header (J1)
to interface a 16-bit CMOS pattern generator to the EV kit.
The header data pins are labeled on the board with their
appropriate data bit designation. Use the labels on the
EV kit to match the data bits from the pattern generator to
the corresponding data pins on header J1.
Clock Signal
The MAX5885 requires a differential clock input signal
with minimal jitter. The EV kit circuit provides single-
ended 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, a minimum amplitude of 1.5VP-P
(7dBm) is recommended or for a square wave, a mini-
mum amplitude signal of 0.5VP-P is recommended.
Reference Voltage Options
The MAX5885 requires a reference voltage to set the
full-scale analog signal output voltage. The DAC con-
tains a stable on-chip bandgap reference of 1.2V that is
used by default. The internal reference can be overdriv-
en by an external reference for gain control or to
enhance accuracy and drift performance.
The MAX5885 EV kit features three ways to provide a
reference voltage to the DAC: internal, on-board exter-
nal, and user-supplied external reference. Verify that a
shunt is not connected across jumper JU5 to use the
internal reference. The reference voltage can be mea-
sured at the V_REF 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 provid-
ed by the MAX5885. Install a shunt across jumpers JU4
and JU5 to use the on-board external reference. The
user can also supply an external voltage reference in
the 0.125V to 1.25V range by connecting a voltage
source to the V_REF pad and removing the shunts
across jumpers JU4 and JU5. See Table 1 to configure
the shunts across jumpers JU4 and JU5 and select the
source of the reference voltage.
Full-Scale Current
The MAX5885 requires an external resistor to set the
full-scale output current. The MAX5885 EV kit full-scale
current is set to 20mA with resistor R7. Replace R7 to
adjust the full-scale output current. Refer to the
Reference Architecture and Operation section in the
MAX5885 data sheet to select different values for R7.
Evaluates: MAX5883/MAX5884/MAX5885
MAX5885 Evaluation Kit
_______________________________________________________________________________________ 3
Table 1. Reference Voltage Selection
JU4 AND JU5 SHUNT
POSITIONS VOLTAGE REFERENCE MODE
Installed External 1.25V reference (U2)
connected to MAX5885 REFIO pin
Not installed MAX5885 internal 1.2V bandgap
reference
Not installed User-supplied voltage reference at
the V_REF pad (0.125V to 1.25V)
Evaluates: MAX5883/MAX5884/MAX5885
Differential Output
The MAX5885 complementary current outputs are termi-
nated into differential 50Ωresistance to generate a volt-
age signal with an amplitude of 1VP-P differential. The
positive and negative rails of the differential signal can be
sampled at the IOUTP and IOUTN probe connectors. The
differential signal is converted into a 50Ωsingled-ended
signal with transformers T1 and T2 and can be sampled
at the OUT SMA connector. A shunt on jumper JU3 con-
nects the center tap of the transformer T2 to AGND to
enhance the dynamic performance of the MAX5885. The
single-ended output signal from the transformer gener-
ates a -2dBm full-scale output power when terminated
into 50Ω. A shunt should always be installed across
jumper JU3 for optimum dynamic performance.
Power-Down
The MAX5885 can be powered down or up by reconfig-
uring jumper JU1. In power-down mode, the total power
dissipation of the DAC is reduced to less than 1mW.
See Table 2 for the jumper JU1 configuration.
Segment Shuffling
The segment shuffling function on the MAX5885
improves the dynamic performance at the cost of a
slight increase in the DAC’s noise floor. The MAX5885
EV kit provides jumper JU2, which allows the user to
enable and disable the segment-shuffling function. See
Table 3 to configure jumper JU2.
XOR Input
The MAX5885 provides an XOR input pin that may be
used to troubleshoot possible spurious or harmonic dis-
tortion degradation due to digital data feedthrough on
the PC board. The XOR pin can be accessed at pin 7
of header J1. Connect an external device to this pin to
assert a logic signal on the XOR pin. Refer to the XOR
Function (XOR ) section in the MAX5885 data sheet for
further details.
Evaluating the MAX5884 or MAX5883
The MAX5885 EV kit can be used to evaluate the
MAX5884 or MAX5883. The MAX5884 is a 14-bit and
the MAX5883 is a 12-bit DAC. Except for the input pins,
these DACs are pin-for-pin compatible with the
MAX5885. Replace the MAX5885 (U1) with the
MAX5884 or the MAX5883 and refer to the respective
data sheet to compare the differences in input pins and
how to modify the connections between the pattern
generator and the EV kit’s J1 input connector.
Board Layout
The MAX5885 EV kit is a four-layer board design opti-
mized for high-speed signals. All high-speed signal
lines are routed through 50Ωimpedance-matched
transmission lines. The length of these 50Ωtransmis-
sion lines is matched to within 40 mils (1mm) to mini-
mize layout-dependent data skew. The board layout
separates the digital, analog, and digital clock sections
of the circuit for optimum performance.
MAX5885 Evaluation Kit
4 _______________________________________________________________________________________
Table 2. Jumper JU1 (Power-Down)
Table 3. Segment Shuffling Mode
(Jumper JU2)
SHUNT LOCATIONS MAX5885 FUNCTION
1 and 2 Power-down mode
2 and 3 Normal operation
SHUNT
LOCATION
SEL0 PIN
(JU2)
SEGMENT-
SHUFFLING
MODE
Installed Connected to
D_VDD Enabled
Not installed
Connected to
DGND with internal
pulldown resistor
Disabled
Evaluates: MAX5883/MAX5884/MAX5885
MAX5885 Evaluation Kit
_______________________________________________________________________________________ 5
MAX5885
U1
B2
B1
1
48 47 46 45 44 43 42 41 40 39 38 37
R32
OPEN
R11
0Ω
R10
0Ω
R31
OPEN
C16
1µF
C15
10µF
10V
C14
47µF
6.3V
L1
DVDD
D_VDD
DGND J1–13
J1–11
J1–15 J1–17 J1–19 J1–21 J1–23 J1–25 J1–27 J1–29 J1–31
J1–28 J1–26 J1–24 J1–22 J1–20 J1–18 J1–16 J1–14 J1–12 J1–10
B3
R33
OPEN
R12
0Ω
B4
R34
OPEN
R13
0Ω
B5
R35
OPEN
R14
0Ω
B6 DVDD DGND
R36
OPEN
C7
0.1µF
DVDD
TP1
R15
0Ω
B7
R37
OPEN
R16
0Ω
B8
R38
OPEN
R17
0Ω
B9
R39
OPEN
R18
0Ω
B10
R40
OPEN
R19
0Ω
B11
R41
OPEN
R20
0Ω
C22
1µF
C21
10µF
10V
C20
47µF
6.3V
L2
VCLK
V_CLK
CLKGND
C27
1µF
C26
10µF
10V
C25
47µF
6.3V
L4
VREF
V_REF
AGND
J1–33
B0
2
R9
0Ω
R8
0Ω
R30
OPEN
J1–9
XOR
3
VCLK
VCLK
4
CLKGND
5
R29
OPEN
C23
OPEN
CLKGND
CLK 1
16
R27
24.9Ω
1%
R28
24.9Ω
1%
4
3
2
CLKGND
TP2
T3
J1–7
C9
0.1µF
CLKP
6
VCLK
VCLK
9
CLKGND
8
10
1
2
3
C8
0.1µF
AVDD
JU1
J1–5
J1–30
J1–32
J1–34
J1–36
J1–38
J1–40 J1–3
J1–1
R25
0Ω
C12
0.1µF
R26
0Ω
C11
0.1µF
CLKN
7
C24
OPEN
CLKGND
CLKGND
CLKGND
DVDD
DVDD
31
DGND 32
SEL0 30
C6
0.1µF
CLKGND
AVDD
AVDD
11
AGND
REFIO FSADJ DACREF
13 14 15 16 17 18 19
12
C3
0.1µF
C2
0.1µF
C10
0.1µF
CLKGND
CLKGND
PD
VREF
JU5
TP5
MAX6161
U2 8
N.C.
N.C.
OUT
N.C.
N.C.
IN
N.C.
GND
7
6
5
1
2
3
4
JU4
AVDD
N.C. AGND
20
AGND
21
AVDD
22
AGND
IOUTN IOUTP
6
1
JU3
TP3
4
R5
SHORT
R7
2kΩ
1%
IOUTP
IOUTN
R6
SHORT
3
4
T2
6
1
1
2
OUT
23
5
T1
R3
100Ω
1%
R1
49.9Ω
0.1%
R2
49.9Ω
0.1%
R4
OPEN
C1
OPEN
C13
0.1µF
C4
0.1µF
AVDD AVDD
23
AVDD
24
AGND
C19
1µF
TP4
C18
10µF
10V
C17
47µF
6.3V
L3
AVDD
A_VDD
AGND
C5
0.1µF
B12 36
R21
0Ω
R42
OPEN
J1–35
B13 35
R22
0Ω
R43
OPEN
J1–37
B14 34
R23
0Ω
R44
OPEN
J1–39
B15 33
R24
0Ω
R45
OPEN
J1–8
J1–6
J1–4
J1–2
DVDD
JU2
N.C. 29
N.C. 26
N.C. 27
N.C. 28
N.C. 25
Figure 1. MAX5885 EV Kit Schematic
Evaluates: MAX5883/MAX5884/MAX5885
MAX5885 Evaluation Kit
6 _______________________________________________________________________________________
Figure 2. MAX5885 EV Kit Component Placement Guide—Component Side
Evaluates: MAX5883/MAX5884/MAX5885
MAX5885 Evaluation Kit
_______________________________________________________________________________________ 7
Figure 3. MAX5885 EV Kit PC Board Layout—Component Side
Evaluates: MAX5883/MAX5884/MAX5885
MAX5885 Evaluation Kit
8 _______________________________________________________________________________________
Figure 4. MAX5885 EV Kit PC Board Layout—Ground Plane
Evaluates: MAX5883/MAX5884/MAX5885
MAX5885 Evaluation Kit
_______________________________________________________________________________________ 9
Figure 5. MAX5885 EV Kit PC Board Layout—Power Plane
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
© 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
Evaluates: MAX5885/MAX5884/MAX5883
MAX5885 Evaluation Kit
Figure 6. MAX5885 EV Kit PC Board Layout—Solder Side
