Texas Instruments DAC82002EVM, Руководство пользователя, Страница: 6 / 24

2.2 Hardware Setup
This section describes the overall system setup for the EVM. A local machine runs the software that provides an
interface to the DAC82002EVM through the onboard controller.
The USB connection generates 5 V of power for use as the DAC supply voltage (VDD). The onboard controller
generates 3.3 V of power for the input/output (I/O) signals generated by the controller. These I/O signals are
level-translated to the VDD voltage of the DAC.
Figure 2-3 displays the system hardware setup.
USB Port
EVM
Jumpers
Figure 2-3. Hardware Setup
2.2.1 Electrostatic Discharge Caution
CAUTION
Many of the components on the DAC82002EVM are susceptible to damage by electrostatic
discharge (ESD). Observe proper ESD handling precautions when unpacking and handling the
EVM, including the use of a grounded wrist strap at an approved ESD workstation.
2.2.2 Power Configurations and Jumper Settings
The DAC82002EVM provides electrical connections to the device supply pins. Table 2-1 shows the connections.
Table 2-1. DAC82002EVM Power Supply Inputs
DAC82002EVM
Connector
Supply Name Voltage Range
J1 VDD 1.8 V to 5.5 V; remove J3 if applying an external VDD to the DAC
J4 AGND 0 V
J7 VREFIN 2 V to VDD; ignore if J8 is shorted and onboard 2.5-V VREF is used
The jumper settings on the DAC82002EVM are crucial to the proper operation of the EVM. Table 2-2 provides
the details of the configurable jumper settings on the EVM. Figure 4-1 defines the DAC82002EVM pin numbers.
Table 2-2. DAC82002EVM Jumper Settings
Jumper Default Position Available Option Description
J3 Short: 3.3 V from USB used as VDD Open: External VDD used External or onboard 3.3-V VDD selection
J5 Short: Reset DAC Value is 0 Open: Reset DAC value is midscale Reset DAC value selection
J8 Short: Onboard 2.5-V VREF used Open: External VREFIN used External or onboard 2.5-V VREF selection
J9 VOUTA: Unbuffered VOUTA output
LN-A: Low-noise VOUTA output
HS-A: High-speed VOUTA output
VOUTA Output Selection
J11 VOUTB: Unbuffered VOUTB output
HS-B: High-speed VOUTB output
LN-B: Low-noise VOUTB output
VOUTB Output Selection
J13 Short: FTDI disabled Open: FTDI enabled FTDI disable
If an external supply is applied to the DAC VDD input, remove jumper J3 to disconnect the 5-V USB supply from
the DAC VDD pin. For SPI communication to operate, J13 must be open.
For J9 and J11, use only one short at a time for each. Short the J10 and J12 SMA connectors to output VOUTA
and VOUTB, respectively.
2.2.3 Connecting the Hardware
After the power and jumper configurations are set up per Section 2.2.2 , connect the USB cable from the
DAC82002EVM USB port to the local machine.
System Setup www.ti.com
6 DAC82002EVM User's Guide SBAU401 – AUGUST 2022
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