Texas Instruments AMC7812EVM-PDK, Руководство пользователя

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AMC7812EVM Hardware Overview
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
DD
and IOV
DD
inputs to be configured to use these
onboard supplies, or external supplies through the J6 terminal block. The AV
CC
input is configured to use
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 Default Position Function
Selecting AV
DD
/DV
DD
voltage
JP3 Shunt on 1-2 • 1~2: Onboard 5-V supply
• 2~3: External supply
Selecting AVCC voltage
JP4 Shunt on 1-2 • 1~2: (Onboard 14-V supply)
• 2~3: (External supply)
Selecting IOV
DD
voltage
JP5 Shunt on 1-2 • 1~2: (Onboard VDUT)
• 2~3: External supply
R62 - 0- Ω shunt • (R62) +5-V LDO supply (default)
R62, R63
R63 - Not populated
• (R63) +3.3-V LDO supply
• (R65) +14-V LDO supply (default)
R65 - 0-
Ω
shunt
R65, R66, R67 R66 - Not populated
• (R66) +5-V LDO supply
R67 - Not populated
• (R67) +3.3-V LDO supply
• (R69) SDM-USB-DIG supply (default)
R69 - 0-
Ω
shunt
R69, R70, R71 R70 - Not populated
• (R70) +5-V LDO supply
R71 - Not populated
• (R71) +3.3-V LDO supply
Additionally, IOV
DD
is supplied by the SDM-USB-DIG but can be externally sourced by setting the JP5
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 .
Table 6. AMC7812EVM ADC Signal Connections
Name Connector Description
ADC0 J7-1 ADC channel 0 input
ADC1 J7-3 ADC channel 1 input
ADC2
(1)
J7-5 ADC channel 2 input
ADC3
(1)
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.
11 SBAU177D – September 2010 – Revised August 2014 AMC7812EVM-PDK User’s Guide
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