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3.1.4.2
Switching and Linear Power Supplies
There are 2 switching power supply regulators and four LDO linear regulators.
Table 6
shows the characteristics of the power supplies.
Power Domains
VCC_3.3V
TPS54362QPWPRQ1
VCC_3.8V
TPS54362QPWPRQ1
3.3V_Maxwell
TPS75233QPWP x2
VCC_1.1V
TPS74701
VCC_1.8V
TPS74701
5.1 V
From Processor
12V and 5.1V enter the board through the interface connectors from the processor board. The VCC_3.3V
is generated on the JAMR3 board and also exported to the processor board. VCC_1.8V supplies power to
the TVP5158 camera encoder, the AIC3106's, and is exported to the processor board through the
interface connectors. VCC_1.1V supplies power to the TVP5158. The VCC_3.8V and 3.3V_Maxwell
supplies support the tuner (AFE8310D) and LNA (AFE8316) chips.
For more information on the power supply regulator chips, see the relevant documents in
3.1.5
Interface for Debug
The CDM header (for interface with Aardvark interface pod) is for debug and software development, it is
required for radio application bring-up.
The CDM 10 pin header supports the connection to the Aardvark Embedded System Interface, which
allows a PC based GUI to control the audio applications, such as starting radio in one audio zone and
playing media audio in a second audio zone. I2C#3 interfaces with the CDM header and acts as an I2C
bus slave.
In addition to using an Aardvark interface pod, a Mini USB connector that interfaces to an MSP430 has
been added to the board to convert USB input into I2C commands on I2C#3.
3.2
Quad-Tuner Radio
The quad-tuner radio configurations are achieved by leveraging four of TI's single-chip AFE8310 tuner
ICs. The AFE8310 is an RF-in digital I/Q-out tuner for low cost automotive-class
AM/FM/FMRDS/WB/HD/DAB/SW reception. It includes integrated LNAs, mixer, PLL, VCO, ADC and
digital decimation filters to support glue-less connections to the processor. For each AFE8310, there is an
SMA connector for AM/FM and another for DAB3/DABL. Each AFE 8310 has associated with it a DAB
LNA (AFE8316). The DAB3/DABL SMA connectors route to the AFE8316's prior to the AFE8310's. The
inputs can be configured for signals from one or two DAB3/DABL antenna connectors driving 2
AFE8310/AFE8216 combinations. The AM/FM inputs can also be configured for one or two AM/FM
antenna signals driving 2 AFE8310's.
For AM/FM, the board is built with one AM/FM RF input driving one AFE5310 Tuner. There are
unpopulated pads in each tuner section that can link multiple tuners together for either AM or FM.
Examining pages 9 to 12 of the JAMR3 schematic shows what pads are available for this use. Connecting
multiple tuners together should be done with caution and by someone that is skilled in RF engineering or
the assistance of someone with RF engineering skills.
SPRUI52 – February 2016
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Table 6. Power Supply Regulator Characteristics
Free Running /Sync Switching
Regulator Chips
[8]
1910 KHz SYNC
1910 KHz SYNC
[9]
(LDO linear regulator)
[10]
(LDO linear regulator)
(LDO linear regulator)
Copyright © 2016, Texas Instruments Incorporated
Frequency
Input Voltage
12 V battery
12 V battery
VCC_3.8V
VCC_3.3V
VCC_3.3V
From Processor
Hardware
Output Current
(Max)
1 A
2 A
2 A
200 mA
500 mA
Section
7.
17
JAMR3
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