MAX19700EVKIT View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX19700EVKIT Datasheet PDF : 18 Pages
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MAX19700 Evaluation Kit/Evaluation System
Jumper JU6
Jumper JU6 is reserved and should not be used. A
shunt should always be placed across pins 2-3 of JU6.
See Table 6 for jumper configuration.
Table 6. Output Format Shunt Settings
(JU6)
SHUNT POSITION
DESCRIPTION
1-2
Reserved
2-3*
Normal operation
*Default configuration: JU6 (2-3).
Configuring the Low-Speed DAC Buffers
The MAX19700 EV kit features on-board configurable
buffers. By default, these buffers are configured for
unity gain. Measure the buffered voltage at the BDAC1,
BDAC2, and BDAC3 pads. Measure the unbuffered
voltage at the DAC1, DAC2, and DAC3 pads.
Configure the on-board buffers for a positive (non-
inverting) gain by performing the following steps:
1) Cut the trace at locations R31, R33, and R35.
2) Select a value of 10kΩ for resistors R32, R34, and
R36.
3) Calculate resistors R31, R33, and R35 using the
equations below.
4) Install R31, R33, and R35 in their respective locations.
where,
R31
=
R32
x
BDAC1
DAC1
−
1
R33
=
R34
x
BDAC2
DAC2
−
1
R35
=
R36
x
BDAC3
DAC3
− 1
BDACx = Desired noninverting gain of buffer
DACx
R32 = R34 = R36 = 10kΩ
Driving Unbuffered Loads
The low-speed buffers (U6) on the MAX19700 EV kit are
optional and if desired can be disconnected from the
DAC outputs of the MAX19700.
Disconnect the buffers from the MAX19700 by cutting
the trace at locations R28, R29, and R30. Connect the
low-speed DAC loads to the DAC1, DAC2, and DAC3
pads on the EV kit. If the load capacitance is between
5pF and 15pF, cut the trace and install 10kΩ resistors
at locations R25, R26, and R27. Resistors are not
required if the load is less than 5pF.
Using an Alternative SPI Interface
The MAX19700 EV kit provides pads and jumpers that
allow an alternative SPI interface to be used. Connect
the interface to the CS, SCLK, DIN, and GND pads.
Ensure that the SPI voltages are compatible with the
MAX19700 working voltages. Refer to the MAX19700
data sheet for suitable SPI interface voltages. Remove
the shunts from jumper JU1. See Table 7 for jumper
configuration.
Table 7. Alternative SPI Interface (JU1)
SHUNT POSITION
DESCRIPTION
1-2
3-4
5-6
Normal operation—three shunts are
installed across pins 1-2, 3-4, and 5-6
Not installed
Alternative SPI interface—no shunts are
installed on JU1, connect the SPI
signals to the CS, SCLK, DIN, and GND
pads
*Default configuration: JU1 (1-2, 3-4, 5-6).
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