Texas Instruments AMC7812EVM-PDK User Manual page 11

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4.4 AMC7812EVM Power Configurations
This section describes the various power configurations that can be used by the EVM.
The AMC7812EVM provides onboard power conditioning to convert the 24-V supply into a 14-V, 5-V, and
3.3-V supply. Jumpers JP3 and JP5 allow the AV
onboard supplies, or external supplies through the J6 terminal block. The AV
the onboard regulated supplies, but can be connected externally by populating the shunt resistors as
shown in Table 5.
Table 5. AMC7812EVM Jumper and Shunt Resistor Settings
Jumper
JP3
JP4
JP5
R62, R63
R65, R66, R67
R69, R70, R71
Additionally, IOV
DD
jumper, and connecting the external source to the J6 terminal block.
4.5 ADC Signal Pins
The AMC7812 device contains 16 analog inputs, 12 of which are single-ended (ADC4 through ADC15)
and have an input range of 0 to 5 V. The other four inputs (ADC0 through ADC3) can be configured as
four single-ended inputs for two fully differential channels, depending on the setup of the ADC channel
registers. These signal pins are connected to the J2, J3, and J7 connectors, which are described in
Table 6.
SBAU177D – September 2010 – Revised August 2014
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Default Position
Shunt on 1-2
Shunt on 1-2
Shunt on 1-2
R62 - 0-Ω shunt
R63 - Not populated
R65 - 0-Ω shunt
R66 - Not populated
R67 - Not populated
R69 - 0-Ω shunt
R70 - Not populated
R71 - Not populated
is supplied by the SDM-USB-DIG but can be externally sourced by setting the JP5
Table 6. AMC7812EVM ADC Signal Connections
Name Connector Description
ADC0 J7-1 ADC channel 0 input
ADC1 J7-3 ADC channel 1 input
(1)
ADC2 J7-5 ADC channel 2 input
(1)
ADC3 J7-7 ADC channel 3 input
ADC4 J2-4 ADC channel 4 input
ADC5 J2-6 ADC channel 5 input
ADC6 J2-8 ADC channel 6 input
(1)
The AMC7812EVM includes two OPA2320 devices, which are
configured to buffer the ADC2/ADC3 inputs. By default, the two inputs
are connected to ground; this is accomplished by using the J7 shunts.
Table 4 shows the default configuration for the shunts. To use the
channels, remove the shunts and apply the desired voltage input to
ADC2 or ADC3.
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and IOV inputs to be configured to use these
DD DD
Function
Selecting AV /DV voltage
DD DD
• 1~2: Onboard 5-V supply
• 2~3: External supply
Selecting AVCC voltage
• 1~2: (Onboard 14-V supply)
• 2~3: (External supply)
Selecting IOV voltage
DD
• 1~2: (Onboard VDUT)
• 2~3: External supply
• (R62) +5-V LDO supply (default)
• (R63) +3.3-V LDO supply
• (R65) +14-V LDO supply (default)
• (R66) +5-V LDO supply
• (R67) +3.3-V LDO supply
• (R69) SDM-USB-DIG supply (default)
• (R70) +5-V LDO supply
• (R71) +3.3-V LDO supply
AMC7812EVM-PDK User's Guide
AMC7812EVM Hardware Overview
input is configured to use
CC
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