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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)
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
SHUNT POSITION
1-2
2-3*
DESCRIPTION
Reserved
Normal operation
pads on the EV kit. If the load capacitance is between
5pF and 15pF, cut the trace and install 10k ? resistors
at locations R25, R26, and R27. Resistors are not
required if the load is less than 5pF.
* 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.
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)
2) Select a value of 10k ? 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.
SHUNT POSITION
1-2
3-4
5-6
DESCRIPTION
Normal operation — three shunts are
installed across pins 1-2, 3-4, and 5-6
Alternative SPI interface — no shunts are
= R
R 31 32 x ?
? 1 ?
? BDAC 1
? DAC 1
?
?
Not installed
installed on JU1, connect the SPI
signals to the CS, SCLK, DIN, and GND
pads
= R
R 33 34 x ?
?
? 1 ?
R 35 = R 36 x ?
?
? 1 ?
where,
? BDAC 2
DAC 2
? BDAC 3
DAC 3
?
?
?
?
* Default configuration: JU1 (1-2, 3-4, 5-6).
BDACx
DACx
= Desired noninverting gain of buffer
R 32 = R 34 = R 36 = 10k ?
10
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