19-3636; Rev 1; 6/07
MAX5876/MAX5877/MAX5878 Evaluation Kits
General Description
The MAX5876/MAX5877/MAX5878 evaluation kits (EV
kit) are fully assembled and tested printed circuit boards
(PCBs) that contain all the components necessary to
evaluate the performance of the MAX5876/MAX5877/
MAX5878 digital-to-analog converters (DACs). The
MAX5876 (12-bit)/MAX5877 (14-bit)/MAX5878 (16-bit)
are 250Msps, dual DACs with interleaved LVDS inputs,
integrated 1.2V voltage reference, and differential cur-
rent outputs. The EV kits operate with LVDS-compatible
digital data inputs, a single-ended clock input, and a
3.3V/1.8V dual power supply for simple board operation.
The MAX5876/MAX5877/MAX5878 EV kits also contain
an external 1.25V voltage-reference circuit that can be
used to drive the MAX5876/MAX5877/MAX5878 input
reference voltage pin.
♦
LVDS-Compatible Inputs
♦
SMA Coaxial Connectors for Clock Input and
Analog Outputs
♦
On-Board External 1.25V Voltage-Reference Circuit
♦
50Ω Matched Clock Input and Analog Output
Signal Lines
♦
Single-Ended-to-Differential Clock Signal
Conversion Circuitry
♦
Differential-Current-to-Single-Ended-Voltage
Output Conversion Circuitry
♦
Full-Scale Current Output Configured for 20mA
♦
Fully Assembled and Tested
Features
♦
Fast Evaluation and Performance Testing
Evaluate: MAX5876/MAX5877/MAX5878
Part Selection Table
PART
MAX5876EGK+D
MAX5877EGK+D
MAX5878EGK+D
BITS
12
14
16
SPEED (Msps)
250
250
250
PART
MAX5876EVKIT#
MAX5877EVKIT#
MAX5878EVKIT#
Ordering Information
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
IC PACKAGE
68 QFN-EP*
68 QFN-EP*
68 QFN-EP*
#Denotes
lead-free and RoHS-compliant EV Kit.
*EP
= Exposed paddle.
Component List
DESIGNATION
C1, C2, C4–C14,
C37
QTY
DESCRIPTION
0.1µF
±10%,
10V X5R ceramic
capacitors (0402)
TDK C1005X5R1A104KT or
Taiyo Yuden LMK105BJ104KV
1µF
±10%,
6.3V X5R ceramic
capacitor (0402)
TDK C1005X5R0J105K
1µF
±10%,
10V X5R ceramic
capacitors (0603)
TDK C1608X5R1A105KT
10µF
±10%,
10V tantalum
capacitors (A)
AVX TAJA106K010R or
Kemet T494A106K010AS
47µF
±10%,
6.3V tantalum
capacitors (B)
AVX TAJB476K006R or
Kemet T494B476K006AS
Not installed, ceramic capacitors
(0603)
DESIGNATION
CLK, OUTPUTI,
OUTPUTQ
J1, J2
JU1, JU2
JU3, JU4
L1–L5
OUTIP, OUTIN,
OUTQP, OUTQN
QTY
3
2
2
2
5
0
DESCRIPTION
SMA PC-mount vertical connectors
2 x 20-pin surface-mount headers
(0.1in)
3-pin headers
2-pin headers
Ferrite bead cores (0805)
Fair-Rite 2508051217Z0
Not installed, SMA PC-mount
vertical connectors
49.9Ω
±0.1%
resistors (0603)
IRC PFC-W0603RLF-03-49R9-B
Panasonic ERA3EHB49R9V
100Ω
±1%
resistors (0603)
2kΩ
±1%
resistor (0603)
24.9Ω
±1%
resistors (0603)
Not installed, resistors (0603)
10kΩ
±5%
resistors (0603)
14
C3
1
C15–C19
5
C20–C24
5
R1, R2, R4, R5
R3, R6
R7
R8, R9
R10–R14
R15, R16
4
2
1
2
0
2
C25–C29
5
C30–C36
0
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
MAX5876/MAX5877/MAX5878 Evaluation Kits
Evaluate: MAX5876/MAX5877/MAX5878
Component List (continued)
DESIGNATION
T1, T2, T3
T4, T5
U1
U2
None
None
QTY
3
2
1
1
4
1
DESCRIPTION
1:1 RF transformers
Mini-Circuits ADTL1-12
1:1 RF transformers
Coilcraft TTWB3010-1
See the EV Kit-Specific
Component List
1.25V voltage reference (8-pin SO)
MAX6161AESA or MAX6161BESA
Shunts (JU1–JU4)
PCB: MAX5876/7/8 Evaluation Kit #
Quick Start
Recommended equipment:
• Three 3.3V, 100mA DC power supplies
•
•
•
•
•
Two 1.8V, 100mA DC power supplies
Two signal generators with low phase noise and low
jitter for clock input (e.g., HP 8664A)
One 20-bit LVDS digital pattern generator for data
inputs (e.g., HP 81250)
One spectrum analyzer (e.g., HP 8560E)
One voltmeter
EV Kit-Specific Component List
EV KIT
MAX5876EVKIT#
DESIGNATION
DESCRIPTION
MAX5876EGK+D (68-pin
QFN-EP, 10mm x 10mm
x 0.9mm)
MAX5877EGK+D (68-pin
QFN-EP, 10mm x 10mm
x 0.9mm)
MAX5878EGK+D (68-pin
QFN-EP, 10mm x 10mm
x 0.9mm)
The MAX5876/MAX5877/MAX5878 EV kits are fully
assembled and tested surface-mount boards. Follow
the steps below for board operation.
Do not turn on
power supplies or enable signal generators until all
connections are completed (Figure 1):
1) Verify that shunts are installed across pins 2 and 3
of jumpers JU1 (normal operation) and JU2 (offset
binary input mode).
2) Verify that shunts are not installed across jumpers
JU3 and JU4 (internal reference).
3) Synchronize the digital pattern generator with the
clock signal generator.
4) Connect the clock signal generator to the EV kit
CLK SMA connector.
5) Verify that the digital pattern generator HP 81250 is
programmed for valid LVDS output voltage levels
and binary digital output.
6) Connect the digital pattern generator output to the
J1 and J2 input header connectors on the EV kit
board. The input header pins are labeled for proper
connection to the digital pattern generator.
MAX5877EVKIT#
U1
MAX5878EVKIT#
Component Suppliers
SUPPLIER
AVX
Coilcraft
Fair-Rite Products
IRC
Kemet
Mini-Circuits
Panasonic
Taiyo Yuden
TDK
PHONE
843-946-0238
847-639-6400
845-895-2055
361-992-7900
864-963-6300
718-934-4500
800-344-2112
800-348-2496
847-803-6100
www.avxcorp.com
www.coilcraft.com
www.fair-rite.com
www.irctt.com
www.kemet.com
www.minicircuits.com
www.panasonic.com
www.t-yuden.com
www.component.tdk.com
WEBSITE
Note:
Indicate that you are using the MAX5876/MAX5877/MAX5878 when contacting these component suppliers.
2
_______________________________________________________________________________________
MAX5876/MAX5877/MAX5878 Evaluation Kits
Evaluate: MAX5876/MAX5877/MAX5878
DATA GENERATOR
MASTER
SIGNAL GENERATOR
HP 8664A
INT*
RF
OUTPUT
CLOCK
INPUT*
LVDS
DATA
PATTERN GENERATOR
HP 81250
36
(B0P/N–B15P/N,
SELIQP/N, XORP/N)
SLAVE
SIGNAL GENERATOR
HP 8664A
EXT*
RF
OUTPUT
CLK
OUTPUTI
OUTPUTQ
J1
INPUT
MAX5876/MAX5877/MAX5878 EV KIT
SPECTRUM ANALYZER
HP 8560E
EXT*
J2
*THESE CONNECTORS ARE LOCATED ON THE BACK SIDE OF THE EQUIPMENT.
Figure 1. MAX5876/MAX5877/MAX5878 EV Kit Quick Start Setup
7) Connect a 1.8V power supply to the AVDD1 PC
board pad. Connect the ground terminal of this
supply to the AGND pad.
8) Connect a 3.3V power supply to the AVDD2 PC
board pad. Connect the ground terminal of this
supply to the AGND pad.
9) Connect a 1.8V power supply to the DVDD1 PC
board pad. Connect the ground terminal of this
supply to the DGND pad.
10) Connect a 3.3V power supply to the DVDD2 PC
board pad. Connect the ground terminal of this
supply to the DGND pad.
11) Connect a 3.3V power supply to the VDD_CK PC
board pad. Connect the ground terminal of this
supply to the GND_CK pad.
12) Turn on all five power supplies.
13) Enable the clock signal generator and the digital
pattern generator.
14) Set the clock signal generator output power
between +8dBm to +12dBm and the frequency
(f
CLK
) to
≤
500MHz.
15) An LVDS logic-high signal at SELIQP/SELIQN
directs data into the I-DAC register. An LVDS logic-
low signal at SELIQP/SELIQN directs data into the
Q-DAC register. Refer to the
LVDS-Compatible
Digital Inputs
section in the MAX5876/MAX5877/
MAX5878 IC data sheets for detailed information on
the SELIQ function.
16) Use the spectrum analyzer to view the MAX5876/
MAX5877/MAX5878 output spectrums or view the
single-ended output waveforms by connecting an
oscilloscope to OUTPUTQ or OUTPUTI SMA con-
nectors.
Detailed Description
The MAX5876/MAX5877/MAX5878 EV kits are designed
to simplify the evaluation of the MAX5876/MAX5877/
MAX5878 dual, 12-bit/14-bit/16-bit, 250Msps, current-
output DACs. The MAX5876/MAX5877/MAX5878 operate
with LVDS-compatible digital data inputs, a differential or
single-ended clock input signal, and two power supplies
(3.3V and 1.8V). The MAX5876/MAX5877/MAX5878
feature internal 1.2V reference voltage.
_______________________________________________________________________________________
3
MAX5876/MAX5877/MAX5878 Evaluation Kits
Evaluate: MAX5876/MAX5877/MAX5878
The MAX5876/MAX5877/MAX5878 EV kits provide head-
er connectors J1 and J2 to interface with a pattern gen-
erator, circuitry that converts the differential current
outputs to single-ended voltage signals, and circuitry to
convert a user-supplied single-ended clock signal to a
differential clock signal. The EV kit circuit also includes
an external 1.25V reference source U2 (MAX6161) and
a test point connector that can be used to overdrive the
MAX5876/MAX5877/MAX5878 internal 1.2V bandgap
reference. The EV kit board layout separates the circuit
power into digital, analog, and clock planes to improve
dynamic performance. The input data PC traces are
100Ω differential controlled impedance and the analog
output PC traces are 50Ω controlled impedance.
Clock Signal
The MAX5876/MAX5877/MAX5878 operate with a differ-
ential clock input signal. However, the EV kit boards only
require an external single-ended clock signal connected
to the CLK SMA connector. The EV kits feature circuitry
that converts the single-ended clock signal to a differen-
tial clock signal. The clock signal can be either a sine or
a square wave. A minimum signal power amplitude of
+8dBm is recommended to drive the clock input. The
MAX5876/MAX5877/MAX5878 accept a clock input fre-
quency in the 2MHz to 500MHz range.
Two’s-Complement/Offset-Binary
Input Format
The two’s-complement or offset-binary input modes of
the MAX5876/MAX5877/MAX5878 are configured with
jumper JU2. Apply either a two’s-complement or offset-
binary formatted input pattern to connectors J1 and J2.
See Table 1 for the jumper JU2 configuration.
Power Supplies
The MAX5876/MAX5877/MAX5878 EV kits operate from
a single 1.8V power supply connected to the DVDD1
and AVDD1 input power pads, and a single 3.3V power
supply connected to the DVDD2, AVDD2, and VDD_CK
input power pads for simple operation. However, five
separate power supplies are recommended to optimize
dynamic performance. The EV kit PCB layout is divided
into three sections: digital, analog, and clock. Using sep-
arate power supplies for each section reduces noise and
improves the integrity of the analog output signal. When
using separate power supplies, connect a 1.8V power
supply across the DVDD1 and DGND pads and a 3.3V
power supply across DVDD2 and DGND pads (digital).
Connect a 1.8V power supply across the AVDD1 and
AGND pads and a 3.3V power supply across AVDD2
and AGND pads (analog). Connect a 3.3V power supply
across VDD_CK and GND_CK pads (clock).
Reference Voltage
The MAX5876/MAX5877/MAX5878 require a reference
voltage to set the full-scale output current of the DAC.
The MAX5876/MAX5877/MAX5878 integrate a stable on-
chip bandgap reference of 1.2V that is selected by
default during initial power-up. An external voltage ref-
erence must be connected to test point TP1 when the
internal voltage reference is overdriven. The EV kits cir-
cuit also features an on-board, external 1.25V voltage
reference (U2, MAX6161) that can be used to overdrive
the internal bandgap reference. U2 has a tighter volt-
age-output tolerance and is less susceptible to temper-
ature variations. See Table 2 to select the voltage refer-
ence source.
LVDS Digital Input Data
The MAX5876/MAX5877/MAX5878 EV kits provide two
0.1in, 2 x 20 headers (J1, J2) to interface an LVDS pat-
tern generator to the EV kit. The header data pins are
labeled on the PCB with their appropriate LVDS data bit
designator. Use the labels on the EV kit board to match
the data bits from the pattern generator to the corre-
sponding data pins on headers J1 and J2. The input
data is latched on the rising edge of the clock signal.
The MAX5876/MAX5877/MAX5878 SELIQ and XOR func-
tions can also be controlled by applying an LVDS logic
signal to the J1 header pins labeled SELIQP, SELIQN,
XORP, and XORN. Refer to the
LVDS-Compatible Digital
Inputs
section in the MAX5876/MAX5877/MAX5878 IC
data sheets for detailed information on the SELIQ and
XOR functions. When using the XOR function, install a
100Ω resistor at the EV kit R14 PCB pad.
Full-Scale Output Current
The MAX5876/MAX5877/MAX5878 require an external
resistor to set the full-scale output current. The
MAX5876/MAX5877/MAX5878 EV kits full-scale current
are set to 20mA with resistor R7 (2kΩ). Replace resistor
R7 to adjust the full-scale output current. Refer to the
Reference Architecture and Operation
section in the
MAX5876/MAX5877/MAX5878 IC data sheets to select
different values for resistor R7.
4
_______________________________________________________________________________________
MAX5876/MAX5877/MAX5878 Evaluation Kits
Outputs
The dual-output channels of the MAX5876/MAX5877/
MAX5878 are configured for differential current mode to
achieve the best dynamic performance. The resistor
and transformer networks at the DAC outputs are
designed to convert the differential current signals into
single-ended voltage signals with a 50Ω output imped-
ance. When an LVDS logic-high input signal is applied
to the SELIQP/SELIQN pins, the data on the input bus
(J1 and J2) is loaded into I-DAC and the reconstructed
single-ended signal is available at the OUTPUTI SMA
connector. When an LVDS logic-low input signal is
applied to the SELIQP/SELIQN pins, the data on the
input bus is loaded into Q-DAC and the reconstructed
single-ended signal is available at the OUTPUTQ SMA
connector. When outputs OUTPUTQ and OUTPUTI are
terminated with 50Ω external loads, the full-scale output
signal level is equal to -2dBm.
To evaluate the converter’s single-ended outputs,
remove transformers T1, T2, and install SMA connec-
tors at the OUTIP, OUTIN, OUTQP, and OUTQN loca-
tions. Probe the single-ended signals at the OUTIP and
OUTIN SMA connectors for I-DAC. Probe the single-
ended signals at the OUTQP and OUTQN SMA con-
nectors for Q-DAC. In a single-ended configuration the
DAC output signal amplitude is equal to 1V
P-P
at each
of the outputs.
Evaluate: MAX5876/MAX5877/MAX5878
Power-Down Mode
The MAX5876/MAX5877/MAX5878 EV kits power-
down/normal operation mode can be configured with
jumper JU1. See Table 3 for jumper JU1 configuration.
PCB Layout
The MAX5876/MAX5877/MAX5878 EV kits are 4-layer
PCB designs optimized for high-speed signals. All
high-speed digital signal lines are routed through 100Ω
differential impedance-matched transmission lines. All
analog output traces are routed through 50Ω imped-
ance-matched transmission lines. The length of these
100Ω and 50Ω transmission lines is matched to within
40 mils (1mm) to minimize layout-dependent data skew.
The PCB layout separates the digital, analog, and clock
sections of the circuit for optimum performance.
Table 1. Jumper JU2 TORB Configuration
SHUNT POSITION
1-2
2-3
Not installed
TORB PIN CONNECTION
Connected to DVDD2
Connected to DGND
MAX5876/MAX5877/MAX5878 have an
internal pulldown resistor
Offset-binary digital signal input format
EV KIT FUNCTION
Two’s-complement digital signal input format
Table 2. Reference Voltage
JUMPER JU3
SHUNT POSITION
Not installed
Installed
JUMPER JU4
SHUNT POSITION
Not installed
Installed
REFIO PIN CONNECTION
Open (REFIO becomes the output of
the internal bandgap reference)
Connected to U2 (MAX6161)
EV KIT FUNCTION
Internal 1.2V reference enabled or
connect an external reference to TP1
U2 provides a precise 1.25V voltage
reference
Table 3. JUMPER JU1 Power-Down Configuration
SHUNT POSITION
1-2
2-3
Not installed
PD PIN CONNECTION
Connected to DVDD2
Connected to DGND
MAX5876/MAX5877/MAX5878 have an
internal pulldown resistor
Normal operation
EV KIT FUNCTION
Power-down mode
_______________________________________________________________________________________
5
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