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MAX5890 Datasheet(PDF) 5 Page - Maxim Integrated Products

No. de Pieza. MAX5890
Descripción  MAX5889/MAX5890/MAX5891 Evaluation Kits
Descarga  14 Pages
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Fabricante  MAXIM [Maxim Integrated Products]
Página de inicio  http://www.maxim-ic.com
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MAX5890 Datasheet(HTML) 5 Page - Maxim Integrated Products

 
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Power Supplies
The EV kits can operate from a single 1.8V power sup-
ply 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 sup-
plies are recommended to optimize dynamic perfor-
mance. The EV kit PCB layout is divided into three sec-
tions: digital, analog, and clock. Using separate 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 the DVDD2 and DGND pads (digital).
Connect a 1.8V power supply across the AVDD1 and
the AGND pads and a 3.3V power supply across the
AVDD2 and the AGND pads (analog). Connect a 3.3V
power supply across the VDD_CK and the CGND pads
(clock).
LVDS Digital Input Data
The MAX5889/MAX5890/MAX5891 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
labeled on the MAX5889/MAX5890/MAX5891 EV kit
PCB are aligned with the MAX5891 DAC data input
pins. See Table 1 to align the MAX5890 and MAX5889
input 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.
Clock Signal
The MAX5889/MAX5890/MAX5891 operate with a dif-
ferential clock input signal. However, the EV kit boards
only require an external single-ended clock signal con-
nected to the CLK SMA connector. The EV kit features
circuitry that converts a single-ended clock signal to a
differential clock signal. The clock signal should be a
low-jitter sine or square wave. A minimum signal power
amplitude of +8dBm is recommended to drive the
clock input. The DACs accept a clock input frequency
range of 1MHz to 600MHz.
Reference Voltage
The MAX5889/MAX5890/MAX5891 DACs require a ref-
erence voltage to set the full-scale output current of the
DAC. The MAX5889/MAX5890/MAX5891 integrate a sta-
ble on-chip bandgap reference of 1.2V that is selected
by default during initial power-up. An external voltage
reference can be connected to test point TP1 to over-
drive the internal voltage reference. The EV kit circuit
also features an on-board, external 1.25V reference (U2,
MAX6161) that can be used to overdrive the internal
voltage reference. U2 has a tighter voltage output toler-
ance and is less susceptible to temperature variations.
See Table 2 to select the voltage reference source.
Full-Scale Output Current
The MAX5889/MAX5890/MAX5891 require an external
resistor to set the full-scale output current. The EV kit full-
scale current is set to 20mA with resistor R4. Replace
resistor R4 to adjust the full-scale output current. Refer to
the Reference Architecture and Operation section in the
MAX5889/MAX5890/MAX5891 corresponding IC data
sheets to select different values for resistor R4.
Outputs
To achieve the best dynamic performance, the
MAX5889/MAX5890/MAX5891 outputs are configured
for differential current mode. The resistor and trans-
former network at the DAC output is designed to con-
vert the differential current to a single-ended voltage
signal with a 50
Ω output impedance. When the OUT-
PUT connector is terminated with a 50
Ω external load,
the full-scale output signal level equals -2dBm.
To evaluate the converter’s single-ended outputs,
remove transformer T1. Probe the single-ended signals
at the OUTIP and OUTIN SMA connectors (must be
installed). In single-ended configuration the DAC output
signal amplitude is equal to 1VP-P at each of the outputs.
MAX5889/MAX5890/MAX5891 Evaluation Kits
_______________________________________________________________________________________
5
SHUNT POSITION
JU2
JU3
REFIO PIN
CONNECTION
EV KIT
FUNCTION
Not
installed
Not
installed
Open (REFIO
becomes the
output of the
internal
bandgap
reference)
Internal 1.2V
reference
enabled or
connect an
external reference
to TP1
Installed*
Installed
Connected to
U2 (MAX6161)
U2 provides a
precise 1.25V
voltage reference
Table 2. Reference Voltage Source
(JU2 and JU3)
*If jumper JU2 is installed, jumper JU3 must be installed.


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