Texas Instruments TPS7A4501-SP, User Manual, Page: 14 / 54

ADS1282-SP EVM Detailed Description
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14 SBAU274 – July 2016
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ADS1282-SP Evaluation Module (ADS1282EVM-CVAL)
5.2 ADS1282-SP Analog Inputs
Figure 13 shows the default assembly of the analog input to Channel 1 (Channel 2 is configured
identically). The input signal passes through a unity gain amplifier U9 and a low pass filter created by R85,
R76, and C49 before entering the ADS1282-SP device. There are placeholders available in the analog
path allowing for several custom configurations.
Figure 13. ADS1282-SP Analog Channel 1 Schematic
5.3 ADS1282-SP MFLAG Overdrive Indicator
As specified in the datasheet, the MFLAG output provides an indication if the full scale digital code is
exceeded. On the EVM,
MFLAG can be monitored at TP11 and also with LED D3 .
5.4 ADS1282-SP EVM Header Configuration
The ADS1282-SP EVM is flexible in its configurability through the use of 2- and 3-pin headers. The default
configuration of the EVM is set to facilitate initial testing by requiring no changes.
Table 1 describes the
default position while Figure 14 shows the default position on the EVM.
Table 1. ADS1282-SP Header Configuration
Reference
Designator
# of
Pins
Default Config Pin 1 Silk
Screen
Pin 2 or 3
Silk Screen
Default Function (Alternate Function)
J6 3 Short pins 2-3 OFF ON Shorts 12 V to inputs of 3 regulators. (Shorts GND to inputs of 3 regulators)
J7 2 Short pins 1-2 10V SELECT REG Shorts 10-V output of regulator to analog section of EVM. (Open circuit allows for
external 10-V supply)
J11 2 Short pins 1-2 5V SELECT REG Shorts 5-V output of regulator to ADS1282-SP pin 19. (Open circuit allows for external
5-V supply)
J12 2 Short pins 1-2 3.3V SELECT REG Shorts 3.3-V output of regulator to ADS1282-SP pin 26. (Open circuit allows for
external 3.3-V supply)
J16 3 Short pins 1-2 VCC GND Enables the 4.096-MHz crystal oscillator. (Disables the oscillator)
J17 3 Short pins 2-3 MSP XTAL Selects 4.096-MHz crystal oscillator as clock source. ( Selects external clock as clock
source via sma J19 or testpoint TP26 )
J5 3 Short pins 1-2 AVDD_+10V GND Powers on analog amplifier channel 2. (Powers Off analog amplifier channel 2)
J20 3 Short pins 1-2 AVDD_+10V GND Powers on analog amplifier channel 1. (Powers Off analog amplifier channel 1)
J8 3 Short pins 1-2 AVDD_+10V GND Powers on 5-V reference source, REF5050. (Powers Off REF5050)
J13 3 Short pins 1-2 AVDD_+10V GND Powers on OPA4277 buffer amps. (Powers Off OPA4277)
J14 6 Open n/a n/a Header from which to take modulator outputs from ADS1282-SP pins MCLK, M0, M1.