MAX5876EVKIT# Maxim Integrated, MAX5876EVKIT# Datasheet - Page 4

• Manufacturer Part Number: MAX5876EVKIT#
• Description: Digital to Analog Converters - DAC Evaluation Kit for the MAX5876/MAX5877/MAX5878
• Manufacturer: Maxim Integrated

Specifications of MAX5876EVKIT#

• Number Of Converters: 2
• Conversion Rate: 250 MSPs
• Resolution: 12 bit
• Interface Type: Parallel or LVDS
• Supply Voltage - Max: 1.89 V, 3.465 V
• Supply Voltage - Min: 1.71 V, 3.135 V

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.
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).
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.
MAX5876/MAX5877/MAX5878 Evaluation Kits
4
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LVDS Digital Input Data
Power Supplies
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.
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.
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.
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.
Two’s-Complement/Offset-Binary
Full-Scale Output Current
Reference Voltage
Input Format
Clock Signal