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ADS4449EVM 产品设计参考手册 - TI（德州仪器）
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ADS4449EVM数据手册
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Introduction
Table 2. ADS4449 EVM Connectors (continued)
Reference Designator Description
J13 CH D input (positive)
J14 CH D input (negative) DNI
The on-board jumper options allow configuration of on-board power supplies and ADC options. Many of
the jumper selections that involve DC inputs or static control signals are by way of push-on square post
jumpers. The jumper options are listed in Table 3. The table indicates the default settings of the jumpers
as the EVM is normally shipped. Some of the jumpers are open circuit by default.
Table 3. ADS4449 EVM Jumper Options
Reference Default Optional
Function Function
Designator Setting Setting
JP1 DNI Connects low-noise LDO (U2) input to main N/A
power input
JP2 1-2 Connects DC/DC converter (U3) output to low- 2-3 Connects DC/DC converter (U3) output
noise LDO (U2) input directly to the ADC
JP3 1-2 Connects low-noise LDO (U2) output to ADC 2-3 Connects DC/DC converter (U3) output
directly to the ADC
JP4 DNI Connects low-noise LDO (U4) input to main N/A
power input
JP5 1-2 Connects DC/DC converter (U3) output to low- 2-3 Connects DC/DC converter (U3) output
noise LDO (U4) input directly to the ADC
JP6 1-2 Connects low-noise LDO (U4) output to ADC 2-3 Connects DC/DC converter (U3) output
directly to the ADC
JP7 2-3 Connects ADC RESET pin G6 to SW1 RESET 1-2 Connects ADC RESET pin G6 to DRVDD
switch
JP8 1-2 N/A Open N/A
JP9 2-3 N/A 1-2 N/A
JP10 1-2 N/A Open N/A
JP11 2-3 Enables ADC 1-2 Power down the ADC or allows the ADC
to standby (configured by CONFIG 0x45,
bit D0)
JP12 2-3 N/A 1-2 N/A
There are two pushbuttons on the EVM. While JP7 is set in the 2-3 position, the pushbutton switch, SW1,
provides a hardware reset to the ADS4449. Upon powering up, the ADC can either accept a hardware
reset by pressing SW1 or by toggling the software reset switch on the EVM GUI. Pushbutton SW2 is not
used. Table 4 lists the descriptions of each pushbutton switch.
Table 4. ADS4449 EVM Pushbutton Switches
Reference
Purpose
Designator
SW1 While JP7 is set in the 2-3 position, pressing SW1 resets the ADC. The ADC can be reset either by pressing
SW1 or with a software reset in the GUI.
SW2 N/A
LED D1 is lit indicating the presence of the 6-V supply voltage to the EVM, while LED D2 is lit indicating
the presence of the USB to serial converter power. LEDs D3 and D4 are not used. Table 5 lists the
description of each LED indicator.
Table 5. ADS4449 EVM LED Indicators
Reference
Description
Designator
D1 When lit, D1 shows the presence of the 6-V (main) power supply
5
SLAU485–January 2013 ADS4449 User Guide
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