MAX5887EVKIT Maxim Integrated, MAX5887EVKIT Datasheet - Page 4

• Manufacturer Part Number: MAX5887EVKIT
• Description: Digital to Analog Converters - DAC Evaluation Kit for the MAX5886 MAX5887 MAX5888
• Manufacturer: Maxim Integrated

Specifications of MAX5887EVKIT

• Number Of Converters: 1
• Conversion Rate: 500 MSPs
• Resolution: 14 bit
• Interface Type: Parallel
• Supply Voltage - Max: 3.465 V
• Supply Voltage - Min: 3.135 V

The DAC requires an external resistor to set the full-
scale output current. The 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 DAC data
sheet to select different values for R7.
The DAC complementary current outputs are terminated
into 50Ω resistance to generate differential voltage sig-
nals with amplitudes of 1V
and negative rails of the differential signal can be sam-
pled at the OUTP and OUTN probe pads. The differential
signal is converted into a 50Ω 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 50Ω. A
shunt on jumper JU4 should always be installed for
optimum dynamic performance.
The DAC can be powered down or powered up by con-
figuring 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.
MAX5886/MAX5887/MAX5888 Evaluation Kits
Table 2. Power-Down (Jumper JU3)
4
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Not installed
Installed
SHUNT
Full-Scale Output Current
P-P
differential. The positive
Power-down mode
Normal operation
Analog Output
FUNCTION
Power-Down
The segment-shuffling function on the DAC can improve
the high-frequency spurious-free dynamic range (SFDR)
at the cost of an increase in the DAC’s noise floor. The
EV kits provide jumper JU5, which allows the user to
enable or disable this function. See Table 3 to configure
jumper JU5.
The EV kit boards are a four-layer board design opti-
mized for high-speed signals. All high-speed signal
lines are routed through 50Ω impedance-matched
transmission lines. The length of these 50Ω transmis-
sion lines is matched to within 40 mils (1mm) to mini-
mize layout-dependent data skew. The board layout
separates the analog, digital, and digital clock sections
of the circuit for optimum performance.
Table 3. Segment-Shuffling Mode
(Jumper JU5)
Not installed
Installed
SHUNT
Connected to
DVDD
Connected to
DGND through an
internal pulldown
resistor
SEL0 PIN
Segment Shuffling
SEGMENT-SHUFFLING
Board Layout
Disabled
Enabled
MODE