Texas Instruments PGA112, User Manual, Page: 15 / 26

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PGA112EVM Hardware Setup
Table 3 explains the function of the jumpers on the PGA112_Test_Board.
Table 3. PGA112_Test_Board Jumper Functions
Jumper Default Purpose
Allows the user to select between an internal fixed 2.5V
Vin_Ref V
REF_DAC
reference (V
REF_INT
) and a variable DAC reference (V
REF_DAC
)
for the OPA333 difference amplifier input.
This jumper allows the user to select between an internal fixed
JP_Ref V
REF_DAC
2.5V reference and a variable DAC reference (V
REF_DAC
) for the
PGA112 or the PGA113.
This jumper allows the user to reference the PGA112 or
JP_112/JP_113 GND
PGA113 to ground or a variable voltage reference.
JP0_112/JP0_113 112_Strip/113_Strip User-selectable output as BNC or wire strip.
DIO_112/DIO_113 INT Internal or external select of data input and output for SPI.
SCK INT Internal or external select of clock for SPI.
CS_112/CS_113 INT Internal or external select of chip select for SPI.
Table 4 summarizes the function of the USB DAQ platform jumpers. For most applications, the default
jumper position should be used. A separate document ( SBOU056 ) gives details regarding the operation
and design of the USB DAQ platform.
Table 4. USB DAQ Platform Jumper Settings
Jumper Default Purpose
This jumper selects external power or bus power. External
power is applied on J5 or T3 (9V dc). Bus power is 5V from the
JUMP1 EXT
USB. External power is typically used because the USB power is
noisy.
JUMP2 EXT Same as JUMP1.
This jumper determines where the PGA112 gets its power
supply. In the V
DUT
position, the EVM provides power. The
JUMP3 EE ON
default setting is the V
DUT
position. In the V
S_EXT
position, the
power is connected externally.
This jumper sets the address for the USB_DAQ board. The only
JUMP4, JUMP5 L, L reason to change this jumper from the default setting is when
multiple boards are being used.
This jumper selects the voltage of the device under test supply
JUMP9 5V
(V
DUT
= 5V or 3V)
JUMP10 WP ON This jumper write-protects the firmware EEPROM.
JUMP11 WP ON This jumper write-protects the calibration EEPROM
Uses the regulator output to generate the V
DUT
supply. The USB
JUMP13 Reg
can be used as the V
DUT
supply.
JUMP14 9V Uses the external power (9V as opposed to the bus)
While in the BUS position, V
DUT
operation is normal. While in the
V
RAW
position the V
DUT
supply is connected to an external
JUMP17 BUS
source. This option allows for any value of V
DUT
between 3V and
5V.
Connects the pull-up on GPIO to the V
DUT
supply or the V
CC
JUMP18 Vdut
supply.
CAUTION
Adjusting the V
DUT
voltage beyond the 3V to 5V range will damage the EVM.
SBOU073 – February 2009 PGA112 Evaluation Module 15
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