MAX5873EVKIT Maxim Integrated, MAX5873EVKIT Datasheet - Page 5

• Manufacturer Part Number: MAX5873EVKIT
• Description: Digital to Analog Converters - DAC Evaluation Kit for the MAX5873 MAX5874 MAX5875
• Manufacturer: Maxim Integrated

Specifications of MAX5873EVKIT

• Number Of Converters: 2
• Conversion Rate: 200 MSPs
• Resolution: 12 bit
• Interface Type: Parallel
• Supply Voltage - Max: 1.89 V, 3.465 V
• Supply Voltage - Min: 1.71 V, 3.135 V

The DAC requires a reference voltage to set the full-
scale output current. The DAC IC integrates a stable
1.20V on-chip bandgap reference that is selected by
default during initial power-up. An external voltage refer-
ence must be connected to test point TP1 when the
internal voltage reference is overdriven. The EV kit cir-
cuit also features an on-board external 1.25V reference
voltage (U2, MAX6161) that can be used to overdrive
the internal bandgap reference. U2 has a tighter voltage
output tolerance and is less susceptible to temperature
variations. See Table 3 to select the voltage reference
source.
The DAC requires an external resistor to set the full-
scale output current. The EV kit full-scale current is set
to 20mA by resistor R7 (2kΩ). Replace resistor R7 to
adjust the full-scale output current. Refer to the
Reference Architecture and Operation section in the
respective DAC data sheet to select different values for
resistor R7.
The dual-output channels of each DAC 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 volt-
Table 3. Reference Voltage (Jumpers JU4 and JU5)
Note: Installing JU5 without JU4 is NOT allowed.
Table 4. Power-Down Configuration (Jumper JU2)
SHUNT LOCATION
SHUNT LOCATION
ON JUMPER JU4
Not Installed
Not Installed
MAX5873/MAX5874/MAX5875 Evaluation Kits
Installed
1-2
2-3
_______________________________________________________________________________________
Connected to DVDD2
Connected to DGND
The DAC has an internal pulldown resistor
Full-Scale Output Current
SHUNT LOCATION
ON JUMPER JU5
Not Installed
Installed
Reference Voltage
PD PIN CONNECTION
Open (REFIO becomes the output of
the internal bandgap reference)
Connected to U2 (MAX6161)
Outputs
REFIO PIN CONNECTION
age signals with a 50Ω impedance. In dual-port mode,
data at pins A_ are loaded into Q-DAC and the recon-
structed single-ended signal is available at
OUTPUTQ SMA connector. Data at pins B_ are loaded
into I-DAC and the reconstructed single-ended signal
is available at OUTPUTI 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 and T2. Then probe the single-ended
signals at the OUTIP and OUTIN SMA connectors (must
be installed) for the I-DAC. Probe the single-ended sig-
nals at the OUTQP and OUTQN SMA connectors (must
be installed) for the Q-DAC. In single-ended configuration
the DAC output signal amplitude is equal to 1V
of the outputs.
The DAC’s EV kit power-down mode can be configured
with jumper JU2. Install a shunt across pins 1 and 2 of
jumper JU2 to power down the EV kit circuit. Install a
shunt across pins 2 and 3 of jumper JU2 for normal oper-
ation. Removing the shunt from jumper JU2 will also
place the circuit in normal operation mode, as the DAC IC
contains an internal pulldown resistor at the PD pin. See
Table 4 for jumper JU2 configuration.
Power-down
Normal operation
Internal 1.20V reference enabled or
connect an external reference to TP1
U2 provides a precision 1.25V voltage
reference
EV KIT FUNCTION
EV KIT FUNCTION
Power-Down Mode
P-P
at each
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