Microchip Technology SA5 Series, Руководство пользователя

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MAC-SA5X User’s Guide
DS50002938A-page 58
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2019 Microchip Technology Inc.
D.2.2 Input Connections
Three input connections are available via SMA connectors on the top of the Evaluation
board. The “Analog Tune” connector accepts a DC voltage (see
Section 3.2 “Analog
Tuning” ) for steering the RF (and PPS outputs). This pin maps to pin 1 on the inserted
MAC device.
Two 1PPS input connections are available (“PPS_in_0” and “PPS_in_1”) for disciplin-
ing the MAC’s output frequency. The Evaluation board accepts a 3.3V @ 50
Ω LVCMOS
1PPS signal. See Section 3.4 “1PPS Disciplining” for details.
D.2.3 Output Connections
Three SMA(f) connectors provide outputs from the MAC’s 10 MHZ, 1PPS_out, and
BITE/Lock pins. The 10 MHz and 1PPS are buffered according to the schematics in
Appendix D and designed to drive 50 Ω , while the BITE/Lock pin maps directly to the
SMA. See Section 1.2.3 “Output Connections” for more details.
D.2.4 Power Connections
The Evaluation board is supplied with a wall-mount power supply capable of powering
the ICs on the board (through “PS1”) as well as a MAC inserted into the board. The
toggle switch “SW1” controls the flow of power to the board.
Alternatively, one may use the wide voltage range connector “J10” if they wish to test
a MAC under variable voltage conditions.
Note: The J11 jumpers must be removed in this mode of operation. Also, the 5V
wall-mount supply must still be employed in order to power the other ICs on
the Evaluation board.
D.2.5 Functional Description and Operation
CAUTION
To avoid electrostatic discharge (ESD) damage, proper ESD handling procedures must
be observed in unpacking, assembling, and testing the MAC.
The MAC and Evaluation board are delivered in ESD-safe packaging. They must be
removed from the ESD-protective bag in an ESD-safe environment. Once installed on
the test fixture, it is recommended that the entire assembly be treated as ESD-sensi-
tive.
Retain the original MAC ESD-safe packaging material in the event that the device
needs to be returned to Microchip for service.
The Evaluation board accepts a MAC-SA5X device using sockets that do not require
the use of solder. Four screws are provided to ensure the device remains properly
seated on the board. Care should be afforded and the number of insertions should be
minimized in order to maximize the lifetime of the sockets and the J9 connector. The
Evaluation board is not designed for repeated production-type testing.
Once a MAC is inserted and the wall-mount power supply is connected, the toggle
switch may be flipped to supply power to the MAC. The user should expect the “Power
Status” LED to illuminate and the communication ports will become active. RF and
1PPS outputs are immediately available after supplying power.
A terminal emulation program may be used to configure and observe the MAC telem-
etry by connecting a PC to J1 or J8 of the Evaluation board (see
Section 3.1 “Configure the Serial Port” ). Once power is supplied to the MAC, it will