Datasheet

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1 EVM Overview
1.1 Features
1.2 Power Requirements
1.2.1 Supply Voltage
1.2.2 Reference Voltage
EVM Overview
4 Jumper Setting Function .................................................................................................. 12
This section gives a general overview of the DAC8871 evaluation module (EVM) and describes some of
the factors to be considered when using this module.
This EVM features the DAC8871 digital-to-analog converter. The DAC8871EVM is a simple evaluation
module designed for a quick and easy way to evaluate the functionality and performance of the 16-bit,
high-resolution, high-voltage output, single-channel, and serial input DAC. This EVM features a
high-speed serial interface of up to 50 MHz to communicate with any host microprocessor or DSP-based
system.
The DAC8871 is designed to work with bipolar output range or unipolar output range depending on the
reference voltage that is applied to the reference input high and low pins (V
REF
H and V
REF
L) of the device.
The voltage reference configuration implemented on this EVM uses the Kelvin connection feature of the
DAC8871 device. This connection helps to minimize the internal errors caused by the changing reference
current and its associated circuit impedances.
A +10-V precision voltage reference is provided onboard via U3 (REF102) to supply the necessary
external reference voltage to set the DAC8871 output range. Though only ± 10-V output range is provided
on the board, the provision of test points TP1 and TP2 allows users to select their own external reference
supply of up to ± 18 V maximum.
The following sections describe the power requirements of this EVM.
The DC power supply requirement for this DAC8871EVM (V
DD
) is selectable between +3.3 V and +5 V via
the W9 jumper header. The +3.3 V comes from J3-9, and the +5 V comes from J3-10 terminal, when
plugged in via the 5-6K interface board or other interface platform. These power supply voltages are
referenced to digital ground through the J3-5 terminal.
The V
CC
and V
SS
that range from +19.8 V maximum to -19.8 V minimum connect through the J3-1 and
J3-2 terminals, respectively. All the analog power supplies are referenced to analog ground through the
J3-6 terminal.
CAUTION
To avoid potential damage to the EVM board, ensure that the correct cables
are connected to their respective terminals as labeled on the EVM board.
Stresses above the maximum listed voltage ratings may cause permanent
damage to the device.
The DAC8871 requires an external reference source to set the DAC’s operating voltage output range. By
applying the desired voltage between the range of 0 V to +18 V into the V
REF
H pin sets the positive range
of the DAC8871 output. In like manner, applying the desired voltage between the range of –18 V to
(V
REF
H – 1.25 V) into the V
REF
L pin sets the negative range of the DAC8871 output. The voltages applied
into the V
REF
H and V
REF
L pins dictate the mode of operation of the DAC (i.e., either unipolar or bipolar
mode).
2 DAC8871 Evaluation Module SLAU233 – September 2007
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