USB Power
4.45 V to 5.25 V
U10
TPS65130
U12
TPS7A4700
U15
TLV70433
U9
TPS7A4700
U11
TPS7A3001
V_USB
POS
NEG
M12
P12
A3.3
AVDD
+ 3.3 VDC
+ 12 VDC
- 12 VDC
+ 13.5 VDC
- 13.5 VDC
DVDD
+ 3.3 VDC
Copyright © 2017, Texas Instruments Incorporated
D3.3
Optional Features
22
SBAU289 – October 2017
Copyright © 2017, Texas Instruments Incorporated
Precision Signal Injector EVM (PSIEVM)
Figure 20. Power Tree
6
Optional Features
In this section the options that are not installed on the PSIEVM are explained.
6.1
Using External Power Supplies
External power supplies are not required as the USB provides sufficient power for normal operation. This
feature is included for debug. To use external power, install jumper JP5 and header P7. Place JP5 in
external mode. Connect a 15-VDC supply and a –15-VDC supply to terminal block P7. The voltage input
at header P7 is directly applied to the linear regulators.
CAUTION
Ensure the connected power supply is at a maximum of 15 V. Fluctuating
above 15 V could result in component damage.
The PSIEVM must still be connected to the computer via the USB cable but this is only used for data from
the GUI and not power.
6.2
Using an External Clock
The audio DAC, PCM5142, runs off the 20-MHz clock produced by the onboard crystal. Future
developments may allow for an external clock input. Currently this hardware is not populated (P6).
6.3
Using an External Input Signal
The PSIEVM generates an output signal without requiring an analog input signal. An external analog input
connection is available for debug purposes. This connection (P1) is not populated, and is not required for
normal operation.
