Texas Instruments Low-Power, Rail-to-Rail Output, 16-Bit Serial Input DIGITAL-TO-ANALOG CONVERTER DAC8531EVM DAC8531EVM 데이터 시트

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If this EVM is used to connect to a DSP evaluation board through the common
connectors, J6 and J7, the DSP evaluation board supplies the power for the
EVM through J6 and J7. The jumper W9 is provided to allow the 3.3-V and
5.5-V supply to be selected individually by the user.

If using an external power supply via J2, remove jumper W9 to avoid
potential damage to the DSP circuitry. On the other hand, if a DSP
evaluation board is connected through the common connectors, J6 and
J7, the external power supply via J2 must be disconnected.

A 5-V precision reference voltage is provided through U15 or U16, whichever
one is installed onboard, via jumper W14 by shorting pins 1 and 2. An adjust-
able 100-k

Ω

 potentiometer, R29, is installed in series with a 20-k

Ω 

resistor,

R30, to allow the user to adjust the reference voltage to its desired settings.
TP11 and TP12 are provided as well, to allow the user to connect an external
reference source not to exceed 5 V dc.

When applying an external voltage reference through TP11, make sure
that it does not exceed 5 V maximum. Otherwise, this will damage the
U11 device, DUT.

The DAC8531EVM is an evaluation platform for the serial input, rail-to-rail out-
put, 12-bit and 16-bit digital-to-analog converters listed in Table 1–1. A built-in
test circuit is provided to easily check the EVM board functionality at a 20-MHz
serial clock rate. The dc self-test mode is performed by correctly setting the
appropriate jumpers and simply turning the SW1 switch to the on position.

Evaluating the DAC device in a more detailed manner can be accomplished
with the use of any microprocessor capable of interfacing with standard SPI,
QSPI, and Microwire, or DSP interfaces. A versatile three-wire serial interface
is implemented to support all the standard interfaces mentioned earlier and
can operate at clock rates up to 30 MHz.

The 20-pin headers, J8, J9, and J10 are provided, as a means to channel all
the necessary signals needed to interface a microprocessor/micro-
controller or some of TI’s older DSP starter kit to the DAC8531 EVM. These
headers can also be used for customizing the user’s processor interface or
hooking up with pattern generators. For most of TI’s DSP starter kits (DSKs)
that support the common connector interface, the headers J6 and J7 mounted
on the bottom side of the EVM board, are used to mate with the DSK’s 80-pin